1extern crate ansi_term;
   2extern crate chrono;
   3#[macro_use]
   4extern crate clap;
   5extern crate colorparse;
   6extern crate git2;
   7extern crate isatty;
   8extern crate munkres;
   9#[macro_use]
  10extern crate quick_error;
  11extern crate tempdir;
  12
  13use std::cmp::max;
  14use std::env;
  15use std::ffi::{OsStr, OsString};
  16use std::fmt::Write as FmtWrite;
  17use std::fs::File;
  18use std::io::Read;
  19use std::io::Write as IoWrite;
  20use std::process::Command;
  21use ansi_term::Style;
  22use chrono::offset::TimeZone;
  23use clap::{App, AppSettings, Arg, ArgGroup, ArgMatches, SubCommand};
  24use git2::{Config, Commit, Delta, Diff, Object, ObjectType, Oid, Reference, Repository, Tree, TreeBuilder};
  25use tempdir::TempDir;
  26
  27quick_error! {
  28    #[derive(Debug)]
  29    enum Error {
  30        Git2(err: git2::Error) {
  31            from()
  32            cause(err)
  33            display("{}", err)
  34        }
  35        IO(err: std::io::Error) {
  36            from()
  37            cause(err)
  38            display("{}", err)
  39        }
  40        Msg(msg: String) {
  41            from()
  42            from(s: &'static str) -> (s.to_string())
  43            description(msg)
  44            display("{}", msg)
  45        }
  46        Utf8Error(err: std::str::Utf8Error) {
  47            from()
  48            cause(err)
  49            display("{}", err)
  50        }
  51    }
  52}
  53
  54type Result<T> = std::result::Result<T, Error>;
  55
  56const COMMIT_MESSAGE_COMMENT: &'static str = "
  57# Please enter the commit message for your changes. Lines starting
  58# with '#' will be ignored, and an empty message aborts the commit.
  59";
  60const COVER_LETTER_COMMENT: &'static str = "
  61# Please enter the cover letter for your changes. Lines starting
  62# with '#' will be ignored, and an empty message aborts the change.
  63";
  64const REBASE_COMMENT: &'static str = "\
  65#
  66# Commands:
  67# p, pick = use commit
  68# r, reword = use commit, but edit the commit message
  69# e, edit = use commit, but stop for amending
  70# s, squash = use commit, but meld into previous commit
  71# f, fixup = like \"squash\", but discard this commit's log message
  72# x, exec = run command (the rest of the line) using shell
  73# d, drop = remove commit
  74#
  75# These lines can be re-ordered; they are executed from top to bottom.
  76#
  77# If you remove a line here THAT COMMIT WILL BE LOST.
  78#
  79# However, if you remove everything, the rebase will be aborted.
  80";
  81const SCISSOR_LINE: &'static str = "\
  82# ------------------------ >8 ------------------------";
  83const SCISSOR_COMMENT: &'static str = "\
  84# Do not touch the line above.
  85# Everything below will be removed.
  86";
  87
  88const SHELL_METACHARS: &'static str = "|&;<>()$`\\\"' \t\n*?[#~=%";
  89
  90const SERIES_PREFIX: &'static str = "refs/heads/git-series/";
  91const SHEAD_REF: &'static str = "refs/SHEAD";
  92const STAGED_PREFIX: &'static str = "refs/git-series-internals/staged/";
  93const WORKING_PREFIX: &'static str = "refs/git-series-internals/working/";
  94
  95const GIT_FILEMODE_BLOB: u32 = 0o100644;
  96const GIT_FILEMODE_COMMIT: u32 = 0o160000;
  97
  98fn zero_oid() -> Oid {
  99    Oid::from_bytes(b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00").unwrap()
 100}
 101
 102fn peel_to_commit(r: Reference) -> Result<Commit> {
 103    Ok(try!(try!(r.peel(ObjectType::Commit)).into_commit().map_err(|obj| format!("Internal error: expected a commit: {}", obj.id()))))
 104}
 105
 106fn commit_obj_summarize_components(commit: &mut Commit) -> Result<(String, String)> {
 107    let short_id_buf = try!(commit.as_object().short_id());
 108    let short_id = short_id_buf.as_str().unwrap();
 109    let summary = String::from_utf8_lossy(commit.summary_bytes().unwrap());
 110    Ok((short_id.to_string(), summary.to_string()))
 111}
 112
 113fn commit_summarize_components(repo: &Repository, id: Oid) -> Result<(String, String)> {
 114    let mut commit = try!(repo.find_commit(id));
 115    commit_obj_summarize_components(&mut commit)
 116}
 117
 118fn commit_obj_summarize(commit: &mut Commit) -> Result<String> {
 119    let (short_id, summary) = try!(commit_obj_summarize_components(commit));
 120    Ok(format!("{} {}", short_id, summary))
 121}
 122
 123fn commit_summarize(repo: &Repository, id: Oid) -> Result<String> {
 124    let mut commit = try!(repo.find_commit(id));
 125    commit_obj_summarize(&mut commit)
 126}
 127
 128fn notfound_to_none<T>(result: std::result::Result<T, git2::Error>) -> Result<Option<T>> {
 129    match result {
 130        Err(ref e) if e.code() == git2::ErrorCode::NotFound => Ok(None),
 131        Err(e) => Err(e.into()),
 132        Ok(x) => Ok(Some(x)),
 133    }
 134}
 135
 136// If current_id_opt is Some, acts like reference_matching.  If current_id_opt is None, acts like
 137// reference.
 138fn reference_matching_opt<'repo>(repo: &'repo Repository, name: &str, id: Oid, force: bool, current_id_opt: Option<Oid>, log_message: &str) -> Result<Reference<'repo>> {
 139    match current_id_opt {
 140        None => Ok(try!(repo.reference(name, id, force, log_message))),
 141        Some(current_id) => Ok(try!(repo.reference_matching(name, id, force, current_id, log_message))),
 142    }
 143}
 144
 145fn parents_from_ids(repo: &Repository, mut parents: Vec<Oid>) -> Result<Vec<Commit>> {
 146    parents.sort();
 147    parents.dedup();
 148    parents.drain(..).map(|id| Ok(try!(repo.find_commit(id)))).collect::<Result<Vec<Commit>>>()
 149}
 150
 151struct Internals<'repo> {
 152    staged: TreeBuilder<'repo>,
 153    working: TreeBuilder<'repo>,
 154}
 155
 156impl<'repo> Internals<'repo> {
 157    fn read(repo: &'repo Repository) -> Result<Self> {
 158        let shead = try!(repo.find_reference(SHEAD_REF));
 159        let series_name = try!(shead_series_name(&shead));
 160        let mut internals = try!(Internals::read_series(repo, &series_name));
 161        try!(internals.update_series(repo));
 162        Ok(internals)
 163    }
 164
 165    fn read_series(repo: &'repo Repository, series_name: &str) -> Result<Self> {
 166        let committed_id = try!(notfound_to_none(repo.refname_to_id(&format!("{}{}", SERIES_PREFIX, series_name))));
 167        let maybe_get_ref = |prefix: &str| -> Result<TreeBuilder<'repo>> {
 168            match try!(notfound_to_none(repo.refname_to_id(&format!("{}{}", prefix, series_name)))).or(committed_id) {
 169                Some(id) => {
 170                    let c = try!(repo.find_commit(id));
 171                    let t = try!(c.tree());
 172                    Ok(try!(repo.treebuilder(Some(&t))))
 173                }
 174                None => Ok(try!(repo.treebuilder(None))),
 175            }
 176        };
 177        Ok(Internals {
 178            staged: try!(maybe_get_ref(STAGED_PREFIX)),
 179            working: try!(maybe_get_ref(WORKING_PREFIX)),
 180        })
 181    }
 182
 183    fn exists(repo: &'repo Repository, series_name: &str) -> Result<bool> {
 184        for prefix in [SERIES_PREFIX, STAGED_PREFIX, WORKING_PREFIX].iter() {
 185            let prefixed_name = format!("{}{}", prefix, series_name);
 186            if try!(notfound_to_none(repo.refname_to_id(&prefixed_name))).is_some() {
 187                return Ok(true);
 188            }
 189        }
 190        Ok(false)
 191    }
 192
 193    // Returns true if it had anything to copy.
 194    fn copy(repo: &'repo Repository, source: &str, dest: &str) -> Result<bool> {
 195        let mut copied_any = false;
 196        for prefix in [SERIES_PREFIX, STAGED_PREFIX, WORKING_PREFIX].iter() {
 197            let prefixed_source = format!("{}{}", prefix, source);
 198            if let Some(r) = try!(notfound_to_none(repo.find_reference(&prefixed_source))) {
 199                let oid = try!(r.target().ok_or(format!("Internal error: \"{}\" is a symbolic reference", prefixed_source)));
 200                let prefixed_dest = format!("{}{}", prefix, dest);
 201                try!(repo.reference(&prefixed_dest, oid, false, &format!("copied from {}", prefixed_source)));
 202                copied_any = true;
 203            }
 204        }
 205        Ok(copied_any)
 206    }
 207
 208    // Returns true if it had anything to delete.
 209    fn delete(repo: &'repo Repository, series_name: &str) -> Result<bool> {
 210        let mut deleted_any = false;
 211        for prefix in [SERIES_PREFIX, STAGED_PREFIX, WORKING_PREFIX].iter() {
 212            let prefixed_name = format!("{}{}", prefix, series_name);
 213            if let Some(mut r) = try!(notfound_to_none(repo.find_reference(&prefixed_name))) {
 214                try!(r.delete());
 215                deleted_any = true;
 216            }
 217        }
 218        Ok(deleted_any)
 219    }
 220
 221    fn update_series(&mut self, repo: &'repo Repository) -> Result<()> {
 222        let head_id = try!(repo.refname_to_id("HEAD"));
 223        try!(self.working.insert("series", head_id, GIT_FILEMODE_COMMIT as i32));
 224        Ok(())
 225    }
 226
 227    fn write(&self, repo: &'repo Repository) -> Result<()> {
 228        let config = try!(repo.config());
 229        let author = try!(get_signature(&config, "AUTHOR"));
 230        let committer = try!(get_signature(&config, "COMMITTER"));
 231
 232        let shead = try!(repo.find_reference(SHEAD_REF));
 233        let series_name = try!(shead_series_name(&shead));
 234        let maybe_commit = |prefix: &str, tb: &TreeBuilder| -> Result<()> {
 235            let tree_id = try!(tb.write());
 236            let refname = format!("{}{}", prefix, series_name);
 237            let old_commit_id = try!(notfound_to_none(repo.refname_to_id(&refname)));
 238            if let Some(id) = old_commit_id {
 239                let c = try!(repo.find_commit(id));
 240                if c.tree_id() == tree_id {
 241                    return Ok(());
 242                }
 243            }
 244            let tree = try!(repo.find_tree(tree_id));
 245            let mut parents = Vec::new();
 246            // Include all commits from tree, to keep them reachable and fetchable. Include base,
 247            // because series might not have it as an ancestor; we don't enforce that until commit.
 248            for e in tree.iter() {
 249                if e.kind() == Some(ObjectType::Commit) {
 250                    parents.push(e.id());
 251                }
 252            }
 253            let parents = try!(parents_from_ids(repo, parents));
 254            let parents_ref: Vec<&_> = parents.iter().collect();
 255            let commit_id = try!(repo.commit(None, &author, &committer, &refname, &tree, &parents_ref));
 256            try!(repo.reference_ensure_log(&refname));
 257            try!(reference_matching_opt(repo, &refname, commit_id, true, old_commit_id, &format!("commit: {}", refname)));
 258            Ok(())
 259        };
 260        try!(maybe_commit(STAGED_PREFIX, &self.staged));
 261        try!(maybe_commit(WORKING_PREFIX, &self.working));
 262        Ok(())
 263    }
 264}
 265
 266fn diff_empty(diff: &Diff) -> bool {
 267    diff.deltas().len() == 0
 268}
 269
 270fn add(repo: &Repository, m: &ArgMatches) -> Result<()> {
 271    let mut internals = try!(Internals::read(repo));
 272    for file in m.values_of_os("change").unwrap() {
 273        match try!(internals.working.get(file)) {
 274            Some(entry) => { try!(internals.staged.insert(file, entry.id(), entry.filemode())); }
 275            None => {
 276                if try!(internals.staged.get(file)).is_some() {
 277                    try!(internals.staged.remove(file));
 278                }
 279            }
 280        }
 281    }
 282    internals.write(repo)
 283}
 284
 285fn unadd(repo: &Repository, m: &ArgMatches) -> Result<()> {
 286    let shead = try!(repo.find_reference(SHEAD_REF));
 287    let started = {
 288        let shead_target = try!(shead.symbolic_target().ok_or("SHEAD not a symbolic reference"));
 289        try!(notfound_to_none(repo.find_reference(shead_target))).is_some()
 290    };
 291
 292    let mut internals = try!(Internals::read(repo));
 293    if started {
 294        let shead_commit = try!(peel_to_commit(shead));
 295        let shead_tree = try!(shead_commit.tree());
 296
 297        for file in m.values_of("change").unwrap() {
 298            match shead_tree.get_name(file) {
 299                Some(entry) => {
 300                    try!(internals.staged.insert(file, entry.id(), entry.filemode()));
 301                }
 302                None => { try!(internals.staged.remove(file)); }
 303            }
 304        }
 305    } else {
 306        for file in m.values_of("change").unwrap() {
 307            try!(internals.staged.remove(file))
 308        }
 309    }
 310    internals.write(repo)
 311}
 312
 313fn shead_series_name(shead: &Reference) -> Result<String> {
 314    let shead_target = try!(shead.symbolic_target().ok_or("SHEAD not a symbolic reference"));
 315    if !shead_target.starts_with(SERIES_PREFIX) {
 316        return Err(format!("SHEAD does not start with {}", SERIES_PREFIX).into());
 317    }
 318    Ok(shead_target[SERIES_PREFIX.len()..].to_string())
 319}
 320
 321fn series(out: &mut Output, repo: &Repository) -> Result<()> {
 322    let mut refs = Vec::new();
 323    for prefix in [SERIES_PREFIX, STAGED_PREFIX, WORKING_PREFIX].iter() {
 324        let l = prefix.len();
 325        for r in try!(repo.references_glob(&[prefix, "*"].concat())).names() {
 326            refs.push(try!(r)[l..].to_string());
 327        }
 328    }
 329    let shead_target = if let Some(shead) = try!(notfound_to_none(repo.find_reference(SHEAD_REF))) {
 330        Some(try!(shead_series_name(&shead)))
 331    } else {
 332        None
 333    };
 334    refs.extend(shead_target.clone().into_iter());
 335    refs.sort();
 336    refs.dedup();
 337
 338    let config = try!(try!(repo.config()).snapshot());
 339    try!(out.auto_pager(&config, "branch", false));
 340    let color_current = try!(out.get_color(&config, "branch", "current", "green"));
 341    let color_plain = try!(out.get_color(&config, "branch", "plain", "normal"));
 342    for name in refs.iter() {
 343        let (star, color) = if Some(name) == shead_target.as_ref() {
 344            ('*', color_current)
 345        } else {
 346            (' ', color_plain)
 347        };
 348        let new = if try!(notfound_to_none(repo.refname_to_id(&format!("{}{}", SERIES_PREFIX, name)))).is_none() {
 349            " (new, no commits yet)"
 350        } else {
 351            ""
 352        };
 353        try!(writeln!(out, "{} {}{}", star, color.paint(name as &str), new));
 354    }
 355    if refs.is_empty() {
 356        try!(writeln!(out, "No series; use \"git series start <name>\" to start"));
 357    }
 358    Ok(())
 359}
 360
 361fn start(repo: &Repository, m: &ArgMatches) -> Result<()> {
 362    let head = try!(repo.head());
 363    let head_commit = try!(peel_to_commit(head));
 364    let head_id = head_commit.as_object().id();
 365
 366    let name = m.value_of("name").unwrap();
 367    if try!(Internals::exists(repo, name)) {
 368        return Err(format!("Series {} already exists.\nUse checkout to resume working on an existing patch series.", name).into());
 369    }
 370    let prefixed_name = &[SERIES_PREFIX, name].concat();
 371    try!(repo.reference_symbolic(SHEAD_REF, &prefixed_name, true, &format!("git series start {}", name)));
 372
 373    let internals = try!(Internals::read(repo));
 374    try!(internals.write(repo));
 375
 376    // git status parses this reflog string; the prefix must remain "checkout: moving from ".
 377    try!(repo.reference("HEAD", head_id, true, &format!("checkout: moving from {} to {} (git series start {})", head_id, head_id, name)));
 378    println!("HEAD is now detached at {}", try!(commit_summarize(&repo, head_id)));
 379    Ok(())
 380}
 381
 382fn checkout_tree(repo: &Repository, treeish: &Object) -> Result<()> {
 383    let mut conflicts = Vec::new();
 384    let mut dirty = Vec::new();
 385    let result = {
 386        let mut opts = git2::build::CheckoutBuilder::new();
 387        opts.safe();
 388        opts.notify_on(git2::CHECKOUT_NOTIFICATION_CONFLICT | git2::CHECKOUT_NOTIFICATION_DIRTY);
 389        opts.notify(|t, path, _, _, _| {
 390            let path = path.unwrap().to_owned();
 391            if t == git2::CHECKOUT_NOTIFICATION_CONFLICT {
 392                conflicts.push(path);
 393            } else if t == git2::CHECKOUT_NOTIFICATION_DIRTY {
 394                dirty.push(path);
 395            }
 396            true
 397        });
 398        if isatty::stdout_isatty() {
 399            opts.progress(|_, completed, total| {
 400                let total = total.to_string();
 401                print!("\rChecking out files: {1:0$}/{2}", total.len(), completed, total);
 402            });
 403        }
 404        repo.checkout_tree(treeish, Some(&mut opts))
 405    };
 406    match result {
 407        Err(ref e) if e.code() == git2::ErrorCode::Conflict => {
 408            let mut msg = String::new();
 409            writeln!(msg, "error: Your changes to the following files would be overwritten by checkout:").unwrap();
 410            for path in conflicts {
 411                writeln!(msg, "        {}", path.to_string_lossy()).unwrap();
 412            }
 413            writeln!(msg, "Please, commit your changes or stash them before you switch series.").unwrap();
 414            return Err(msg.into());
 415        }
 416        _ => try!(result),
 417    }
 418    println!("");
 419    if !dirty.is_empty() {
 420        let mut stderr = std::io::stderr();
 421        writeln!(stderr, "Files with changes unaffected by checkout:").unwrap();
 422        for path in dirty {
 423            writeln!(stderr, "        {}", path.to_string_lossy()).unwrap();
 424        }
 425    }
 426    Ok(())
 427}
 428
 429fn checkout(repo: &Repository, m: &ArgMatches) -> Result<()> {
 430    match repo.state() {
 431        git2::RepositoryState::Clean => (),
 432        s => { return Err(format!("{:?} in progress; cannot checkout patch series", s).into()); }
 433    }
 434    let name = m.value_of("name").unwrap();
 435    if !try!(Internals::exists(repo, name)) {
 436        return Err(format!("Series {} does not exist.\nUse \"git series start <name>\" to start a new patch series.", name).into());
 437    }
 438
 439    let internals = try!(Internals::read_series(repo, name));
 440    let new_head_id = try!(try!(internals.working.get("series")).ok_or(format!("Could not find \"series\" in \"{}\"", name))).id();
 441    let new_head = try!(repo.find_commit(new_head_id)).into_object();
 442
 443    try!(checkout_tree(repo, &new_head));
 444
 445    let head = try!(repo.head());
 446    let head_commit = try!(peel_to_commit(head));
 447    let head_id = head_commit.as_object().id();
 448    println!("Previous HEAD position was {}", try!(commit_summarize(&repo, head_id)));
 449
 450    let prefixed_name = &[SERIES_PREFIX, name].concat();
 451    try!(repo.reference_symbolic(SHEAD_REF, &prefixed_name, true, &format!("git series checkout {}", name)));
 452    try!(internals.write(repo));
 453
 454    // git status parses this reflog string; the prefix must remain "checkout: moving from ".
 455    try!(repo.reference("HEAD", new_head_id, true, &format!("checkout: moving from {} to {} (git series checkout {})", head_id, new_head_id, name)));
 456    println!("HEAD is now detached at {}", try!(commit_summarize(&repo, new_head_id)));
 457
 458    Ok(())
 459}
 460
 461fn base(repo: &Repository, m: &ArgMatches) -> Result<()> {
 462    let mut internals = try!(Internals::read(repo));
 463
 464    let current_base_id = match try!(internals.working.get("base")) {
 465        Some(entry) => entry.id(),
 466        _ => zero_oid(),
 467    };
 468
 469    if !m.is_present("delete") && !m.is_present("base") {
 470        if current_base_id.is_zero() {
 471            return Err("Patch series has no base set".into());
 472        } else {
 473            println!("{}", current_base_id);
 474            return Ok(());
 475        }
 476    }
 477
 478    let new_base_id = if m.is_present("delete") {
 479        zero_oid()
 480    } else {
 481        let base = m.value_of("base").unwrap();
 482        let base_object = try!(repo.revparse_single(base));
 483        let base_commit = try!(base_object.peel(ObjectType::Commit));
 484        let base_id = base_commit.id();
 485        let s_working_series = try!(try!(internals.working.get("series")).ok_or("Could not find entry \"series\" in working vesion of current series"));
 486        if base_id != s_working_series.id() && !try!(repo.graph_descendant_of(s_working_series.id(), base_id)) {
 487            return Err(format!("Cannot set base to {}: not an ancestor of the patch series {}", base, s_working_series.id()).into());
 488        }
 489        base_id
 490    };
 491
 492    if current_base_id == new_base_id {
 493        println!("Base unchanged");
 494        return Ok(());
 495    }
 496
 497    if !current_base_id.is_zero() {
 498        println!("Previous base was {}", try!(commit_summarize(&repo, current_base_id)));
 499    }
 500
 501    if new_base_id.is_zero() {
 502        try!(internals.working.remove("base"));
 503        try!(internals.write(repo));
 504        println!("Cleared patch series base");
 505    } else {
 506        try!(internals.working.insert("base", new_base_id, GIT_FILEMODE_COMMIT as i32));
 507        try!(internals.write(repo));
 508        println!("Set patch series base to {}", try!(commit_summarize(&repo, new_base_id)));
 509    }
 510
 511    Ok(())
 512}
 513
 514fn detach(repo: &Repository) -> Result<()> {
 515    match repo.find_reference(SHEAD_REF) {
 516        Ok(mut r) => try!(r.delete()),
 517        Err(_) => { return Err("No current patch series to detach from.".into()); }
 518    }
 519    Ok(())
 520}
 521
 522fn delete(repo: &Repository, m: &ArgMatches) -> Result<()> {
 523    let name = m.value_of("name").unwrap();
 524    if let Ok(shead) = repo.find_reference(SHEAD_REF) {
 525        let shead_target = try!(shead_series_name(&shead));
 526        if shead_target == name {
 527            return Err(format!("Cannot delete the current series \"{}\"; detach first.", name).into());
 528        }
 529    }
 530    if !try!(Internals::delete(repo, name)) {
 531        return Err(format!("Nothing to delete: series \"{}\" does not exist.", name).into());
 532    }
 533    Ok(())
 534}
 535
 536fn do_diff(out: &mut Output, repo: &Repository) -> Result<()> {
 537    let internals = try!(Internals::read(&repo));
 538    let config = try!(try!(repo.config()).snapshot());
 539    try!(out.auto_pager(&config, "diff", true));
 540    let diffcolors = try!(DiffColors::new(out, &config));
 541
 542    let working_tree = try!(repo.find_tree(try!(internals.working.write())));
 543    let staged_tree = try!(repo.find_tree(try!(internals.staged.write())));
 544
 545    write_series_diff(out, repo, &diffcolors, Some(&staged_tree), Some(&working_tree))
 546}
 547
 548fn get_editor(config: &Config) -> Result<OsString> {
 549    if let Some(e) = env::var_os("GIT_EDITOR") {
 550        return Ok(e);
 551    }
 552    if let Ok(e) = config.get_path("core.editor") {
 553        return Ok(e.into());
 554    }
 555    let terminal_is_dumb = match env::var_os("TERM") {
 556        None => true,
 557        Some(t) => t.as_os_str() == "dumb",
 558    };
 559    if !terminal_is_dumb {
 560        if let Some(e) = env::var_os("VISUAL") {
 561            return Ok(e);
 562        }
 563    }
 564    if let Some(e) = env::var_os("EDITOR") {
 565        return Ok(e);
 566    }
 567    if terminal_is_dumb {
 568        return Err("TERM unset or \"dumb\" but EDITOR unset".into());
 569    }
 570    return Ok("vi".into());
 571}
 572
 573// Get the pager to use; with for_cmd set, get the pager for use by the
 574// specified git command.  If get_pager returns None, don't use a pager.
 575fn get_pager(config: &Config, for_cmd: &str, default: bool) -> Option<OsString> {
 576    if !isatty::stdout_isatty() {
 577        return None;
 578    }
 579    // pager.cmd can contain a boolean (if false, force no pager) or a
 580    // command-specific pager; only treat it as a command if it doesn't parse
 581    // as a boolean.
 582    let maybe_pager = config.get_path(&format!("pager.{}", for_cmd)).ok();
 583    let (cmd_want_pager, cmd_pager) = maybe_pager.map_or((default, None), |p|
 584            if let Ok(b) = Config::parse_bool(&p) {
 585                (b, None)
 586            } else {
 587                (true, Some(p))
 588            }
 589        );
 590    if !cmd_want_pager {
 591        return None;
 592    }
 593    let pager =
 594        if let Some(e) = env::var_os("GIT_PAGER") {
 595            Some(e)
 596        } else if let Some(p) = cmd_pager {
 597            Some(p.into())
 598        } else if let Ok(e) = config.get_path("core.pager") {
 599            Some(e.into())
 600        } else if let Some(e) = env::var_os("PAGER") {
 601            Some(e)
 602        } else {
 603            Some("less".into())
 604        };
 605    pager.and_then(|p| if p.is_empty() || p == OsString::from("cat") { None } else { Some(p) })
 606}
 607
 608/// Construct a Command, using the shell if the command contains shell metachars
 609fn cmd_maybe_shell<S: AsRef<OsStr>>(program: S, args: bool) -> Command {
 610    if program.as_ref().to_string_lossy().contains(|c| SHELL_METACHARS.contains(c)) {
 611        let mut cmd = Command::new("sh");
 612        cmd.arg("-c");
 613        if args {
 614            let mut program_with_args = program.as_ref().to_os_string();
 615            program_with_args.push(" \"$@\"");
 616            cmd.arg(program_with_args).arg(program);
 617        } else {
 618            cmd.arg(program);
 619        }
 620        cmd
 621    } else {
 622        Command::new(program)
 623    }
 624}
 625
 626fn run_editor<S: AsRef<OsStr>>(config: &Config, filename: S) -> Result<()> {
 627    let editor = try!(get_editor(&config));
 628    let editor_status = try!(cmd_maybe_shell(editor, true).arg(&filename).status());
 629    if !editor_status.success() {
 630        return Err(format!("Editor exited with status {}", editor_status).into());
 631    }
 632    Ok(())
 633}
 634
 635struct Output {
 636    pager: Option<std::process::Child>,
 637    include_stderr: bool,
 638}
 639
 640impl Output {
 641    fn new() -> Self {
 642        Output { pager: None, include_stderr: false }
 643    }
 644
 645    fn auto_pager(&mut self, config: &Config, for_cmd: &str, default: bool) -> Result<()> {
 646        if let Some(pager) = get_pager(config, for_cmd, default) {
 647            let mut cmd = cmd_maybe_shell(pager, false);
 648            cmd.stdin(std::process::Stdio::piped());
 649            if env::var_os("LESS").is_none() {
 650                cmd.env("LESS", "FRX");
 651            }
 652            if env::var_os("LV").is_none() {
 653                cmd.env("LV", "-c");
 654            }
 655            let child = try!(cmd.spawn());
 656            self.pager = Some(child);
 657            self.include_stderr = isatty::stderr_isatty();
 658        }
 659        Ok(())
 660    }
 661
 662    // Get a color to write text with, taking git configuration into account.
 663    //
 664    // config: the configuration to determine the color from.
 665    // command: the git command to act like.
 666    // slot: the color "slot" of that git command to act like.
 667    // default: the color to use if not configured.
 668    fn get_color(&self, config: &Config, command: &str, slot: &str, default: &str) -> Result<Style> {
 669        if !cfg!(unix) {
 670            return Ok(Style::new());
 671        }
 672        let color_ui = try!(notfound_to_none(config.get_str("color.ui"))).unwrap_or("auto");
 673        let color_cmd = try!(notfound_to_none(config.get_str(&format!("color.{}", command)))).unwrap_or(color_ui);
 674        if color_cmd == "never" || Config::parse_bool(color_cmd) == Ok(false) {
 675            return Ok(Style::new());
 676        }
 677        if self.pager.is_some() {
 678            let color_pager = try!(notfound_to_none(config.get_bool(&format!("color.pager")))).unwrap_or(true);
 679            if !color_pager {
 680                return Ok(Style::new());
 681            }
 682        } else if !isatty::stdout_isatty() {
 683            return Ok(Style::new());
 684        }
 685        let cfg = format!("color.{}.{}", command, slot);
 686        let color = try!(notfound_to_none(config.get_str(&cfg))).unwrap_or(default);
 687        colorparse::parse(color).map_err(|e| format!("Error parsing {}: {}", cfg, e).into())
 688   }
 689
 690    fn write_err(&mut self, msg: &str) {
 691        if self.include_stderr {
 692            if write!(self, "{}", msg).is_err() {
 693                write!(std::io::stderr(), "{}", msg).unwrap();
 694            }
 695        } else {
 696            write!(std::io::stderr(), "{}", msg).unwrap();
 697        }
 698    }
 699}
 700
 701impl Drop for Output {
 702    fn drop(&mut self) {
 703        if let Some(ref mut child) = self.pager {
 704            let status = child.wait().unwrap();
 705            if !status.success() {
 706                writeln!(std::io::stderr(), "Pager exited with status {}", status).unwrap();
 707            }
 708        }
 709    }
 710}
 711
 712impl IoWrite for Output {
 713    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
 714        match self.pager {
 715            Some(ref mut child) => child.stdin.as_mut().unwrap().write(buf),
 716            None => std::io::stdout().write(buf),
 717        }
 718    }
 719
 720    fn flush(&mut self) -> std::io::Result<()> {
 721        match self.pager {
 722            Some(ref mut child) => child.stdin.as_mut().unwrap().flush(),
 723            None => std::io::stdout().flush(),
 724        }
 725    }
 726}
 727
 728fn get_signature(config: &Config, which: &str) -> Result<git2::Signature<'static>> {
 729    let name_var = ["GIT_", which, "_NAME"].concat();
 730    let email_var = ["GIT_", which, "_EMAIL"].concat();
 731    let which_lc = which.to_lowercase();
 732    let name = try!(env::var(&name_var).or_else(
 733            |_| config.get_string("user.name").or_else(
 734                |_| Err(format!("Could not determine {} name: checked ${} and user.name in git config", which_lc, name_var)))));
 735    let email = try!(env::var(&email_var).or_else(
 736            |_| config.get_string("user.email").or_else(
 737                |_| env::var("EMAIL").or_else(
 738                    |_| Err(format!("Could not determine {} email: checked ${}, user.email in git config, and $EMAIL", which_lc, email_var))))));
 739    Ok(try!(git2::Signature::now(&name, &email)))
 740}
 741
 742fn commit_status(out: &mut Output, repo: &Repository, m: &ArgMatches, do_status: bool) -> Result<()> {
 743    let config = try!(try!(repo.config()).snapshot());
 744    let shead = match repo.find_reference(SHEAD_REF) {
 745        Err(ref e) if e.code() == git2::ErrorCode::NotFound => { println!("No series; use \"git series start <name>\" to start"); return Ok(()); }
 746        result => try!(result),
 747    };
 748    let series_name = try!(shead_series_name(&shead));
 749
 750    if do_status {
 751        try!(out.auto_pager(&config, "status", false));
 752    }
 753    let get_color = |out: &Output, color: &str, default: &str| {
 754        if do_status {
 755            out.get_color(&config, "status", color, default)
 756        } else {
 757            Ok(Style::new())
 758        }
 759    };
 760    let color_normal = Style::new();
 761    let color_header = try!(get_color(out, "header", "normal"));
 762    let color_updated = try!(get_color(out, "updated", "green"));
 763    let color_changed = try!(get_color(out, "changed", "red"));
 764
 765    let write_status = |status: &mut Vec<ansi_term::ANSIString>, diff: &Diff, heading: &str, color: &Style, show_hints: bool, hints: &[&str]| -> Result<bool> {
 766        let mut changes = false;
 767
 768        try!(diff.foreach(&mut |delta, _| {
 769            if !changes {
 770                changes = true;
 771                status.push(color_header.paint(format!("{}\n", heading.to_string())));
 772                if show_hints {
 773                    for hint in hints {
 774                        status.push(color_header.paint(format!("  ({})\n", hint)));
 775                    }
 776                }
 777                status.push(color_normal.paint("\n"));
 778            }
 779            status.push(color_normal.paint("        "));
 780            status.push(color.paint(format!("{:?}:   {}\n", delta.status(), delta.old_file().path().unwrap().to_str().unwrap())));
 781            true
 782        }, None, None, None));
 783
 784        if changes {
 785            status.push(color_normal.paint("\n"));
 786        }
 787
 788        Ok(changes)
 789    };
 790
 791    let mut status = Vec::new();
 792    status.push(color_header.paint(format!("On series {}\n", series_name)));
 793
 794    let mut internals = try!(Internals::read(repo));
 795    let working_tree = try!(repo.find_tree(try!(internals.working.write())));
 796    let staged_tree = try!(repo.find_tree(try!(internals.staged.write())));
 797
 798    let shead_commit = match shead.resolve() {
 799        Ok(r) => Some(try!(peel_to_commit(r))),
 800        Err(ref e) if e.code() == git2::ErrorCode::NotFound => {
 801            status.push(color_header.paint("\nInitial series commit\n"));
 802            None
 803        }
 804        Err(e) => try!(Err(e)),
 805    };
 806    let shead_tree = match shead_commit {
 807        Some(ref c) => Some(try!(c.tree())),
 808        None => None,
 809    };
 810
 811    let commit_all = m.is_present("all");
 812
 813    let (changes, tree) = if commit_all {
 814        let diff = try!(repo.diff_tree_to_tree(shead_tree.as_ref(), Some(&working_tree), None));
 815        let changes = try!(write_status(&mut status, &diff, "Changes to be committed:", &color_normal, false, &[]));
 816        if !changes {
 817            status.push(color_normal.paint("nothing to commit; series unchanged\n"));
 818        }
 819        (changes, working_tree)
 820    } else {
 821        let diff = try!(repo.diff_tree_to_tree(shead_tree.as_ref(), Some(&staged_tree), None));
 822        let changes_to_be_committed = try!(write_status(&mut status, &diff,
 823                "Changes to be committed:", &color_updated, do_status,
 824                &["use \"git series commit\" to commit",
 825                  "use \"git series unadd <file>...\" to undo add"]));
 826
 827        let diff_not_staged = try!(repo.diff_tree_to_tree(Some(&staged_tree), Some(&working_tree), None));
 828        let changes_not_staged = try!(write_status(&mut status, &diff_not_staged,
 829                "Changes not staged for commit:", &color_changed, do_status,
 830                &["use \"git series add <file>...\" to update what will be committed"]));
 831
 832        if !changes_to_be_committed {
 833            if changes_not_staged {
 834                status.push(color_normal.paint("no changes added to commit (use \"git series add\" or \"git series commit -a\")\n"));
 835            } else {
 836                status.push(color_normal.paint("nothing to commit; series unchanged\n"));
 837            }
 838        }
 839
 840        (changes_to_be_committed, staged_tree)
 841    };
 842
 843    let status = ansi_term::ANSIStrings(&status).to_string();
 844    if do_status || !changes {
 845        if do_status {
 846            try!(write!(out, "{}", status));
 847        } else {
 848            return Err(status.into());
 849        }
 850        return Ok(());
 851    }
 852
 853    // Check that the commit includes the series
 854    let series_id = match tree.get_name("series") {
 855        None => { return Err(concat!("Cannot commit: initial commit must include \"series\"\n",
 856                                     "Use \"git series add series\" or \"git series commit -a\"").into()); }
 857        Some(series) => series.id()
 858    };
 859
 860    // Check that the base is still an ancestor of the series
 861    if let Some(base) = tree.get_name("base") {
 862        if base.id() != series_id && !try!(repo.graph_descendant_of(series_id, base.id())) {
 863            let (base_short_id, base_summary) = try!(commit_summarize_components(&repo, base.id()));
 864            let (series_short_id, series_summary) = try!(commit_summarize_components(&repo, series_id));
 865            return Err(format!(concat!(
 866                       "Cannot commit: base {} is not an ancestor of patch series {}\n",
 867                       "base   {} {}\n",
 868                       "series {} {}"),
 869                       base_short_id, series_short_id,
 870                       base_short_id, base_summary,
 871                       series_short_id, series_summary).into());
 872        }
 873    }
 874
 875    let msg = match m.value_of("m") {
 876        Some(s) => s.to_string(),
 877        None => {
 878            let filename = repo.path().join("SCOMMIT_EDITMSG");
 879            let mut file = try!(File::create(&filename));
 880            try!(write!(file, "{}", COMMIT_MESSAGE_COMMENT));
 881            for line in status.lines() {
 882                if line.is_empty() {
 883                    try!(writeln!(file, "#"));
 884                } else {
 885                    try!(writeln!(file, "# {}", line));
 886                }
 887            }
 888            if m.is_present("verbose") {
 889                try!(writeln!(file, "{}\n{}", SCISSOR_LINE, SCISSOR_COMMENT));
 890                try!(write_series_diff(&mut file, repo, &DiffColors::plain(), shead_tree.as_ref(), Some(&tree)));
 891            }
 892            drop(file);
 893            try!(run_editor(&config, &filename));
 894            let mut file = try!(File::open(&filename));
 895            let mut msg = String::new();
 896            try!(file.read_to_string(&mut msg));
 897            if let Some(scissor_index) = msg.find(SCISSOR_LINE) {
 898                msg.truncate(scissor_index);
 899            }
 900            try!(git2::message_prettify(msg, git2::DEFAULT_COMMENT_CHAR))
 901        }
 902    };
 903    if msg.is_empty() {
 904        return Err("Aborting series commit due to empty commit message.".into());
 905    }
 906
 907    let author = try!(get_signature(&config, "AUTHOR"));
 908    let committer = try!(get_signature(&config, "COMMITTER"));
 909    let mut parents: Vec<Oid> = Vec::new();
 910    // Include all commits from tree, to keep them reachable and fetchable.
 911    for e in tree.iter() {
 912        if e.kind() == Some(ObjectType::Commit) && e.name().unwrap() != "base" {
 913            parents.push(e.id())
 914        }
 915    }
 916    let parents = try!(parents_from_ids(repo, parents));
 917    let parents_ref: Vec<&_> = shead_commit.iter().chain(parents.iter()).collect();
 918    let new_commit_oid = try!(repo.commit(Some(SHEAD_REF), &author, &committer, &msg, &tree, &parents_ref));
 919
 920    if commit_all {
 921        internals.staged = try!(repo.treebuilder(Some(&tree)));
 922        try!(internals.write(repo));
 923    }
 924
 925    let (new_commit_short_id, new_commit_summary) = try!(commit_summarize_components(&repo, new_commit_oid));
 926    try!(writeln!(out, "[{} {}] {}", series_name, new_commit_short_id, new_commit_summary));
 927
 928    Ok(())
 929}
 930
 931fn cover(repo: &Repository, m: &ArgMatches) -> Result<()> {
 932    let mut internals = try!(Internals::read(repo));
 933
 934    let (working_cover_id, working_cover_content) = match try!(internals.working.get("cover")) {
 935        None => (zero_oid(), String::new()),
 936        Some(entry) => (entry.id(), try!(std::str::from_utf8(try!(repo.find_blob(entry.id())).content())).to_string()),
 937    };
 938
 939    if m.is_present("delete") {
 940        if working_cover_id.is_zero() {
 941            return Err("No cover to delete".into());
 942        }
 943        try!(internals.working.remove("cover"));
 944        try!(internals.write(repo));
 945        println!("Deleted cover letter");
 946        return Ok(());
 947    }
 948
 949    let filename = repo.path().join("COVER_EDITMSG");
 950    let mut file = try!(File::create(&filename));
 951    if working_cover_content.is_empty() {
 952        try!(write!(file, "{}", COVER_LETTER_COMMENT));
 953    } else {
 954        try!(write!(file, "{}", working_cover_content));
 955    }
 956    drop(file);
 957    let config = try!(repo.config());
 958    try!(run_editor(&config, &filename));
 959    let mut file = try!(File::open(&filename));
 960    let mut msg = String::new();
 961    try!(file.read_to_string(&mut msg));
 962    let msg = try!(git2::message_prettify(msg, git2::DEFAULT_COMMENT_CHAR));
 963    if msg.is_empty() {
 964        return Err("Empty cover letter; not changing.\n(To delete the cover letter, use \"git series cover -d\".)".into());
 965    }
 966
 967    let new_cover_id = try!(repo.blob(msg.as_bytes()));
 968    if new_cover_id == working_cover_id {
 969        println!("Cover letter unchanged");
 970    } else {
 971        try!(internals.working.insert("cover", new_cover_id, GIT_FILEMODE_BLOB as i32));
 972        try!(internals.write(repo));
 973        println!("Updated cover letter");
 974    }
 975
 976    Ok(())
 977}
 978
 979fn cp_mv(repo: &Repository, m: &ArgMatches, mv: bool) -> Result<()> {
 980    let shead_target = if let Some(shead) = try!(notfound_to_none(repo.find_reference(SHEAD_REF))) {
 981        Some(try!(shead_series_name(&shead)))
 982    } else {
 983        None
 984    };
 985    let mut source_dest = m.values_of("source_dest").unwrap();
 986    let dest = source_dest.next_back().unwrap();
 987    let (update_shead, source) = match source_dest.next_back().map(String::from) {
 988        Some(name) => (shead_target.as_ref() == Some(&name), name),
 989        None => (true, try!(shead_target.ok_or("No current series"))),
 990    };
 991
 992    if try!(Internals::exists(&repo, dest)) {
 993        return Err(format!("The destination series \"{}\" already exists", dest).into());
 994    }
 995    if !try!(Internals::copy(&repo, &source, &dest)) {
 996        return Err(format!("The source series \"{}\" does not exist", source).into());
 997    }
 998
 999    if mv {
1000        if update_shead {
1001            let prefixed_dest = &[SERIES_PREFIX, dest].concat();
1002            try!(repo.reference_symbolic(SHEAD_REF, &prefixed_dest, true, &format!("git series mv {} {}", source, dest)));
1003        }
1004        try!(Internals::delete(&repo, &source));
1005    }
1006
1007    Ok(())
1008}
1009
1010fn date_822(t: git2::Time) -> String {
1011    let offset = chrono::offset::fixed::FixedOffset::east(t.offset_minutes()*60);
1012    let datetime = offset.timestamp(t.seconds(), 0);
1013    datetime.to_rfc2822()
1014}
1015
1016fn shortlog(commits: &mut [Commit]) -> String {
1017    let mut s = String::new();
1018    let mut author_map = std::collections::HashMap::new();
1019
1020    for mut commit in commits {
1021        let author = commit.author().name().unwrap().to_string();
1022        author_map.entry(author).or_insert(Vec::new()).push(commit.summary().unwrap().to_string());
1023    }
1024
1025    let mut authors: Vec<_> = author_map.keys().collect();
1026    authors.sort();
1027    let mut first = true;
1028    for author in authors {
1029        if first {
1030            first = false;
1031        } else {
1032            writeln!(s, "").unwrap();
1033        }
1034        let summaries = author_map.get(author).unwrap();
1035        writeln!(s, "{} ({}):", author, summaries.len()).unwrap();
1036        for summary in summaries {
1037            writeln!(s, "  {}", summary).unwrap();
1038        }
1039    }
1040
1041    s
1042}
1043
1044fn ascii_isalnum(c: char) -> bool {
1045    (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9')
1046}
1047
1048fn sanitize_summary(summary: &str) -> String {
1049    let mut s = String::with_capacity(summary.len());
1050    let mut prev_dot = false;
1051    let mut need_space = false;
1052    for c in summary.chars() {
1053        if ascii_isalnum(c) || c == '_' || c == '.' {
1054            if need_space {
1055                s.push('-');
1056                need_space = false;
1057            }
1058            if !(prev_dot && c == '.') {
1059                s.push(c);
1060            }
1061        } else {
1062            if !s.is_empty() {
1063                need_space = true;
1064            }
1065        }
1066        prev_dot = c == '.';
1067    }
1068    let end = s.trim_right_matches(|c| c == '.' || c == '-').len();
1069    s.truncate(end);
1070    s
1071}
1072
1073#[test]
1074fn test_sanitize_summary() {
1075    let tests = vec![
1076        ("", ""),
1077        ("!!!!!", ""),
1078        ("Test", "Test"),
1079        ("Test case", "Test-case"),
1080        ("Test    case", "Test-case"),
1081        ("    Test    case    ", "Test-case"),
1082        ("...Test...case...", ".Test.case"),
1083        ("...Test...case.!!", ".Test.case"),
1084        (".!.Test.!.case.!.", ".-.Test.-.case"),
1085    ];
1086    for (summary, sanitized) in tests {
1087        assert_eq!(sanitize_summary(summary), sanitized.to_string());
1088    }
1089}
1090
1091fn split_message(message: &str) -> (&str, &str) {
1092    let mut iter = message.splitn(2, '\n');
1093    let subject = iter.next().unwrap().trim_right();
1094    let body = iter.next().map(|s| s.trim_left()).unwrap_or("");
1095    (subject, body)
1096}
1097
1098struct DiffColors {
1099    commit: Style,
1100    meta: Style,
1101    frag: Style,
1102    func: Style,
1103    context: Style,
1104    old: Style,
1105    new: Style,
1106    series_old: Style,
1107    series_new: Style,
1108}
1109
1110impl DiffColors {
1111    fn plain() -> Self {
1112        DiffColors {
1113            commit: Style::new(),
1114            meta: Style::new(),
1115            frag: Style::new(),
1116            func: Style::new(),
1117            context: Style::new(),
1118            old: Style::new(),
1119            new: Style::new(),
1120            series_old: Style::new(),
1121            series_new: Style::new(),
1122        }
1123    }
1124
1125    fn new(out: &Output, config: &Config) -> Result<Self> {
1126        let old = try!(out.get_color(&config, "diff", "old", "red"));
1127        let new = try!(out.get_color(&config, "diff", "new", "green"));
1128        Ok(DiffColors {
1129            commit: try!(out.get_color(&config, "diff", "commit", "yellow")),
1130            meta: try!(out.get_color(&config, "diff", "meta", "bold")),
1131            frag: try!(out.get_color(&config, "diff", "frag", "cyan")),
1132            func: try!(out.get_color(&config, "diff", "func", "normal")),
1133            context: try!(out.get_color(&config, "diff", "context", "normal")),
1134            old: old,
1135            new: new,
1136            series_old: old.reverse(),
1137            series_new: new.reverse(),
1138        })
1139    }
1140}
1141
1142fn diffstat(diff: &Diff) -> Result<String> {
1143    let stats = try!(diff.stats());
1144    let stats_buf = try!(stats.to_buf(git2::DIFF_STATS_FULL|git2::DIFF_STATS_INCLUDE_SUMMARY, 72));
1145    Ok(stats_buf.as_str().unwrap().to_string())
1146}
1147
1148fn write_diff<W: IoWrite>(f: &mut W, colors: &DiffColors, diff: &Diff, simplify: bool) -> Result<usize> {
1149    let mut err = Ok(());
1150    let mut lines = 0;
1151    let normal = Style::new();
1152    try!(diff.print(git2::DiffFormat::Patch, |_, _, l| {
1153        err = || -> Result<()> {
1154            let o = l.origin();
1155            let style = match o {
1156                '-'|'<' => colors.old,
1157                '+'|'>' => colors.new,
1158                _ if simplify => normal,
1159                ' '|'=' => colors.context,
1160                'F' => colors.meta,
1161                'H' => colors.frag,
1162                _ => normal,
1163            };
1164            let obyte = [o as u8];
1165            let mut v = Vec::new();
1166            if o == '+' || o == '-' || o == ' ' {
1167                v.push(style.paint(&obyte[..]));
1168            }
1169            if simplify {
1170                if o == 'H' {
1171                    v.push(normal.paint("@@\n".as_bytes()));
1172                    lines += 1;
1173                } else if o == 'F' {
1174                    for line in l.content().split(|c| *c == b'\n') {
1175                        if !line.is_empty() && !line.starts_with(b"diff --git") && !line.starts_with(b"index ") {
1176                            v.push(normal.paint(line.to_owned()));
1177                            v.push(normal.paint("\n".as_bytes()));
1178                            lines += 1;
1179                        }
1180                    }
1181                } else {
1182                    v.push(style.paint(l.content()));
1183                    lines += 1;
1184                }
1185            } else if o == 'H' {
1186                // Split frag and func
1187                let line = l.content();
1188                let at = &|&(_,&c): &(usize, &u8)| c == b'@';
1189                let not_at = &|&(_,&c): &(usize, &u8)| c != b'@';
1190                match line.iter().enumerate().skip_while(at).skip_while(not_at).skip_while(at).nth(1).unwrap_or((0,&b'\n')) {
1191                    (_,&c) if c == b'\n' => v.push(style.paint(&line[..line.len()-1])),
1192                    (pos,_) => {
1193                        v.push(style.paint(&line[..pos-1]));
1194                        v.push(normal.paint(" ".as_bytes()));
1195                        v.push(colors.func.paint(&line[pos..line.len()-1]));
1196                    },
1197                }
1198                v.push(normal.paint("\n".as_bytes()));
1199            } else {
1200                // The less pager resets ANSI colors at each newline, so emit colors separately for
1201                // each line.
1202                for (n, line) in l.content().split(|c| *c == b'\n').enumerate() {
1203                    if n != 0 {
1204                        v.push(normal.paint("\n".as_bytes()));
1205                    }
1206                    if !line.is_empty() {
1207                        v.push(style.paint(line));
1208                    }
1209                }
1210            }
1211            try!(ansi_term::ANSIByteStrings(&v).write_to(f));
1212            Ok(())
1213        }();
1214        err.is_ok()
1215    }));
1216    try!(err);
1217    Ok(lines)
1218}
1219
1220fn get_commits(repo: &Repository, base: Oid, series: Oid) -> Result<Vec<Commit>> {
1221    let mut revwalk = try!(repo.revwalk());
1222    revwalk.set_sorting(git2::SORT_TOPOLOGICAL|git2::SORT_REVERSE);
1223    try!(revwalk.push(series));
1224    try!(revwalk.hide(base));
1225    revwalk.map(|c| {
1226        let id = try!(c);
1227        let commit = try!(repo.find_commit(id));
1228        Ok(commit)
1229    }).collect()
1230}
1231
1232fn write_commit_range_diff<W: IoWrite>(out: &mut W, repo: &Repository, colors: &DiffColors, (base1, series1): (Oid, Oid), (base2, series2): (Oid, Oid)) -> Result<()> {
1233    let mut commits1 = try!(get_commits(repo, base1, series1));
1234    let mut commits2 = try!(get_commits(repo, base2, series2));
1235    for commit in commits1.iter().chain(commits2.iter()) {
1236        if commit.parent_ids().count() > 1 {
1237            try!(writeln!(out, "(Diffs of series with merge commits ({}) not yet supported)", commit.id()));
1238            return Ok(());
1239        }
1240    }
1241    let ncommon = commits1.iter().zip(commits2.iter()).take_while(|&(ref c1, ref c2)| c1.id() == c2.id()).count();
1242    drop(commits1.drain(..ncommon));
1243    drop(commits2.drain(..ncommon));
1244    let ncommits1 = commits1.len();
1245    let ncommits2 = commits2.len();
1246    let n = ncommits1 + ncommits2;
1247    if n == 0 {
1248        return Ok(());
1249    }
1250    let commit_text = &|commit: &Commit| {
1251        let parent = try!(commit.parent(0));
1252        let author = commit.author();
1253        let diff = try!(repo.diff_tree_to_tree(Some(&parent.tree().unwrap()), Some(&commit.tree().unwrap()), None));
1254        let mut v = Vec::new();
1255        try!(v.write_all(b"From: "));
1256        try!(v.write_all(author.name_bytes()));
1257        try!(v.write_all(b" <"));
1258        try!(v.write_all(author.email_bytes()));
1259        try!(v.write_all(b">\n\n"));
1260        try!(v.write_all(commit.message_bytes()));
1261        try!(v.write_all(b"\n"));
1262        let lines = try!(write_diff(&mut v, colors, &diff, true));
1263        Ok((v, lines))
1264    };
1265    let texts1: Vec<_> = try!(commits1.iter().map(commit_text).collect::<Result<_>>());
1266    let texts2: Vec<_> = try!(commits2.iter().map(commit_text).collect::<Result<_>>());
1267
1268    let mut weights = Vec::with_capacity(n*n);
1269    for i1 in 0..ncommits1 {
1270        for i2 in 0..ncommits2 {
1271            let patch = try!(git2::Patch::from_buffers(&texts1[i1].0, None, &texts2[i2].0, None, None));
1272            let (_, additions, deletions) = try!(patch.line_stats());
1273            weights.push(additions+deletions);
1274        }
1275        let w = texts1[i1].1 / 2;
1276        for _ in ncommits2..n {
1277            weights.push(w);
1278        }
1279    }
1280    for _ in ncommits1..n {
1281        for i2 in 0..ncommits2 {
1282            weights.push(texts2[i2].1 / 2);
1283        }
1284        for _ in ncommits2..n {
1285            weights.push(0);
1286        }
1287    }
1288    let mut weight_matrix = munkres::WeightMatrix::from_row_vec(n, weights);
1289    let result = munkres::solve_assignment(&mut weight_matrix);
1290
1291    #[derive(Copy, Clone, Debug, PartialEq, Eq)]
1292    enum CommitState { Unhandled, Handled, Deleted };
1293    let mut commits2_from1: Vec<_> = std::iter::repeat(None).take(ncommits2).collect();
1294    let mut commits1_state: Vec<_> = std::iter::repeat(CommitState::Unhandled).take(ncommits1).collect();
1295    let mut commit_pairs = Vec::with_capacity(n);
1296    for (i1, i2) in result {
1297        if i1 < ncommits1 {
1298            if i2 < ncommits2 {
1299                commits2_from1[i2] = Some(i1);
1300            } else {
1301                commits1_state[i1] = CommitState::Deleted;
1302            }
1303        }
1304    }
1305
1306    // Show matching or new commits sorted by the new commit order. Show deleted commits after
1307    // showing all of their prerequisite commits.
1308    let mut commits1_state_index = 0;
1309    for (i2, opt_i1) in commits2_from1.iter().enumerate() {
1310        //for i1 in commits1_state_index..ncommits1 {
1311        while commits1_state_index < ncommits1 {
1312            match commits1_state[commits1_state_index] {
1313                CommitState::Unhandled => { break }
1314                CommitState::Handled => {},
1315                CommitState::Deleted => {
1316                    commit_pairs.push((Some(commits1_state_index), None));
1317                },
1318            }
1319            commits1_state_index += 1;
1320        }
1321        if let &Some(i1) = opt_i1 {
1322            commit_pairs.push((Some(i1), Some(i2)));
1323            commits1_state[i1] = CommitState::Handled;
1324        } else {
1325            commit_pairs.push((None, Some(i2)));
1326        }
1327    }
1328    for i1 in commits1_state_index..ncommits1 {
1329        if commits1_state[i1] == CommitState::Deleted {
1330            commit_pairs.push((Some(i1), None));
1331        }
1332    }
1333
1334    let normal = Style::new();
1335    let nl = |v: &mut Vec<_>| { v.push(normal.paint("\n".as_bytes())); };
1336    let mut v = Vec::new();
1337    v.push(colors.meta.paint("diff --series".as_bytes()));
1338    nl(&mut v);
1339
1340    let offset = ncommon + 1;
1341    let nwidth = max(ncommits1 + offset, ncommits2 + offset).to_string().len();
1342    let commits1_summaries: Vec<_> = try!(commits1.iter_mut().map(commit_obj_summarize_components).collect());
1343    let commits2_summaries: Vec<_> = try!(commits2.iter_mut().map(commit_obj_summarize_components).collect());
1344    let idwidth = commits1_summaries.iter().chain(commits2_summaries.iter()).map(|&(ref short_id, _)| short_id.len()).max().unwrap();
1345    for commit_pair in commit_pairs {
1346        match commit_pair {
1347            (None, None) => unreachable!(),
1348            (Some(i1), None) => {
1349                let (ref c1_short_id, ref c1_summary) = commits1_summaries[i1];
1350                v.push(colors.old.paint(format!("{:nwidth$}: {:idwidth$} < {:-<nwidth$}: {:-<idwidth$} {}",
1351                                                i1 + offset, c1_short_id, "", "", c1_summary, nwidth=nwidth, idwidth=idwidth).as_bytes().to_owned()));
1352                nl(&mut v);
1353            }
1354            (None, Some(i2)) => {
1355                let (ref c2_short_id, ref c2_summary) = commits2_summaries[i2];
1356                v.push(colors.new.paint(format!("{:-<nwidth$}: {:-<idwidth$} > {:nwidth$}: {:idwidth$} {}",
1357                                                "", "", i2 + offset, c2_short_id, c2_summary, nwidth=nwidth, idwidth=idwidth).as_bytes().to_owned()));
1358                nl(&mut v);
1359            }
1360            (Some(i1), Some(i2)) => {
1361                let mut patch = try!(git2::Patch::from_buffers(&texts1[i1].0, None, &texts2[i2].0, None, None));
1362                let (old, ch, new) = if let Delta::Unmodified = patch.delta().status() {
1363                    (colors.commit, '=', colors.commit)
1364                } else {
1365                    (colors.series_old, '!', colors.series_new)
1366                };
1367                let (ref c1_short_id, _) = commits1_summaries[i1];
1368                let (ref c2_short_id, ref c2_summary) = commits2_summaries[i2];
1369                v.push(old.paint(format!("{:nwidth$}: {:idwidth$}", i1 + offset, c1_short_id, nwidth=nwidth, idwidth=idwidth).as_bytes().to_owned()));
1370                v.push(colors.commit.paint(format!(" {} ", ch).as_bytes().to_owned()));
1371                v.push(new.paint(format!("{:nwidth$}: {:idwidth$}", i2 + offset, c2_short_id, nwidth=nwidth, idwidth=idwidth).as_bytes().to_owned()));
1372                v.push(colors.commit.paint(format!(" {}", c2_summary).as_bytes().to_owned()));
1373                nl(&mut v);
1374                try!(patch.print(&mut |_, _, l| {
1375                    let o = l.origin();
1376                    let style = match o {
1377                        '-'|'<' => old,
1378                        '+'|'>' => new,
1379                        _ => normal,
1380                    };
1381                    if o == '+' || o == '-' || o == ' ' {
1382                        v.push(style.paint(vec![o as u8]));
1383                    }
1384                    let style = if o == 'H' { colors.frag } else { normal };
1385                    if o != 'F' {
1386                        v.push(style.paint(l.content().to_owned()));
1387                    }
1388                    true
1389                }));
1390            }
1391        }
1392    }
1393
1394    try!(ansi_term::ANSIByteStrings(&v).write_to(out));
1395    Ok(())
1396}
1397
1398fn write_series_diff<W: IoWrite>(out: &mut W, repo: &Repository, colors: &DiffColors, tree1: Option<&Tree>, tree2: Option<&Tree>) -> Result<()> {
1399    let diff = try!(repo.diff_tree_to_tree(tree1, tree2, None));
1400    try!(write_diff(out, colors, &diff, false));
1401
1402    let base1 = tree1.and_then(|t| t.get_name("base"));
1403    let series1 = tree1.and_then(|t| t.get_name("series"));
1404    let base2 = tree2.and_then(|t| t.get_name("base"));
1405    let series2 = tree2.and_then(|t| t.get_name("series"));
1406
1407    if let (Some(base1), Some(series1), Some(base2), Some(series2)) = (base1, series1, base2, series2) {
1408        try!(write_commit_range_diff(out, repo, colors, (base1.id(), series1.id()), (base2.id(), series2.id())));
1409    } else {
1410        try!(writeln!(out, "Can't diff series: both versions must have base and series to diff"));
1411    }
1412
1413    Ok(())
1414}
1415
1416fn mail_signature() -> String {
1417    format!("-- \ngit-series {}", crate_version!())
1418}
1419
1420fn ensure_space(s: &str) -> &'static str {
1421    if s.is_empty() || s.ends_with(' ') {
1422        ""
1423    } else {
1424        " "
1425    }
1426}
1427
1428fn ensure_nl(s: &str) -> &'static str {
1429    if !s.ends_with('\n') {
1430        "\n"
1431    } else {
1432        ""
1433    }
1434}
1435
1436fn format(out: &mut Output, repo: &Repository, m: &ArgMatches) -> Result<()> {
1437    let config = try!(try!(repo.config()).snapshot());
1438    let to_stdout = m.is_present("stdout");
1439    let no_from = m.is_present("no-from");
1440
1441    let shead_commit = try!(peel_to_commit(try!(try!(repo.find_reference(SHEAD_REF)).resolve())));
1442    let stree = try!(shead_commit.tree());
1443
1444    let series = try!(stree.get_name("series").ok_or("Internal error: series did not contain \"series\""));
1445    let base = try!(stree.get_name("base").ok_or("Cannot format series; no base set.\nUse \"git series base\" to set base."));
1446
1447    let mut revwalk = try!(repo.revwalk());
1448    revwalk.set_sorting(git2::SORT_TOPOLOGICAL|git2::SORT_REVERSE);
1449    try!(revwalk.push(series.id()));
1450    try!(revwalk.hide(base.id()));
1451    let mut commits: Vec<Commit> = try!(revwalk.map(|c| {
1452        let id = try!(c);
1453        let commit = try!(repo.find_commit(id));
1454        if commit.parent_ids().count() > 1 {
1455            return Err(format!("Error: cannot format merge commit as patch:\n{}", try!(commit_summarize(repo, id))).into());
1456        }
1457        Ok(commit)
1458    }).collect::<Result<_>>());
1459    if commits.is_empty() {
1460        return Err("No patches to format; series and base identical.".into());
1461    }
1462
1463    let committer = try!(get_signature(&config, "COMMITTER"));
1464    let committer_name = committer.name().unwrap();
1465    let committer_email = committer.email().unwrap();
1466    let message_id_suffix = format!("{}.git-series.{}", committer.when().seconds(), committer_email);
1467
1468    let cover_entry = stree.get_name("cover");
1469    let mut in_reply_to_message_id = m.value_of("in-reply-to").map(|v| {
1470        format!("{}{}{}",
1471                if v.starts_with('<') { "" } else { "<" },
1472                v,
1473                if v.ends_with('>') { "" } else { ">" })
1474    });
1475
1476    let version = m.value_of("reroll-count");
1477    let subject_prefix = if m.is_present("rfc") {
1478        "RFC PATCH"
1479    } else {
1480        m.value_of("subject-prefix").unwrap_or("PATCH")
1481    };
1482    let subject_patch = version.map_or(
1483            subject_prefix.to_string(),
1484            |n| format!("{}{}v{}", subject_prefix, ensure_space(&subject_prefix), n));
1485    let file_prefix = version.map_or("".to_string(), |n| format!("v{}-", n));
1486
1487    let signature = mail_signature();
1488
1489    if to_stdout {
1490        try!(out.auto_pager(&config, "format-patch", true));
1491    }
1492    let diffcolors = if to_stdout {
1493        try!(DiffColors::new(out, &config))
1494    } else {
1495        DiffColors::plain()
1496    };
1497    let mut out : Box<IoWrite> = if to_stdout {
1498        Box::new(out)
1499    } else {
1500        Box::new(std::io::stdout())
1501    };
1502    let patch_file = |name: &str| -> Result<Box<IoWrite>> {
1503        let name = format!("{}{}", file_prefix, name);
1504        println!("{}", name);
1505        Ok(Box::new(try!(File::create(name))))
1506    };
1507
1508    if let Some(ref entry) = cover_entry {
1509        let cover_blob = try!(repo.find_blob(entry.id()));
1510        let content = try!(std::str::from_utf8(cover_blob.content())).to_string();
1511        let (subject, body) = split_message(&content);
1512
1513        let series_tree = try!(repo.find_commit(series.id())).tree().unwrap();
1514        let base_tree = try!(repo.find_commit(base.id())).tree().unwrap();
1515        let diff = try!(repo.diff_tree_to_tree(Some(&base_tree), Some(&series_tree), None));
1516        let stats = try!(diffstat(&diff));
1517
1518        if !to_stdout {
1519            out = try!(patch_file("0000-cover-letter.patch"));
1520        }
1521        try!(writeln!(out, "From {} Mon Sep 17 00:00:00 2001", shead_commit.id()));
1522        let cover_message_id = format!("<cover.{}.{}>", shead_commit.id(), message_id_suffix);
1523        try!(writeln!(out, "Message-Id: {}", cover_message_id));
1524        if let Some(ref message_id) = in_reply_to_message_id {
1525            try!(writeln!(out, "In-Reply-To: {}", message_id));
1526            try!(writeln!(out, "References: {}", message_id));
1527        }
1528        in_reply_to_message_id = Some(cover_message_id);
1529        try!(writeln!(out, "From: {} <{}>", committer_name, committer_email));
1530        try!(writeln!(out, "Date: {}", date_822(committer.when())));
1531        try!(writeln!(out, "Subject: [{}{}0/{}] {}\n", subject_patch, ensure_space(&subject_patch), commits.len(), subject));
1532        if !body.is_empty() {
1533            try!(writeln!(out, "{}", body));
1534        }
1535        try!(writeln!(out, "{}", shortlog(&mut commits)));
1536        try!(writeln!(out, "{}", stats));
1537        try!(writeln!(out, "base-commit: {}", base.id()));
1538        try!(writeln!(out, "{}", signature));
1539    }
1540
1541    for (commit_num, commit) in commits.iter().enumerate() {
1542        let first_mail = commit_num == 0 && cover_entry.is_none();
1543        if to_stdout && !first_mail {
1544            try!(writeln!(out, ""));
1545        }
1546
1547        let message = commit.message().unwrap();
1548        let (subject, body) = split_message(message);
1549        let commit_id = commit.id();
1550        let commit_author = commit.author();
1551        let commit_author_name = commit_author.name().unwrap();
1552        let commit_author_email = commit_author.email().unwrap();
1553        let summary_sanitized = sanitize_summary(&subject);
1554        let this_message_id = format!("<{}.{}>", commit_id, message_id_suffix);
1555        let parent = try!(commit.parent(0));
1556        let diff = try!(repo.diff_tree_to_tree(Some(&parent.tree().unwrap()), Some(&commit.tree().unwrap()), None));
1557        let stats = try!(diffstat(&diff));
1558
1559        if !to_stdout {
1560            out = try!(patch_file(&format!("{:04}-{}.patch", commit_num+1, summary_sanitized)));
1561        }
1562        try!(writeln!(out, "From {} Mon Sep 17 00:00:00 2001", commit_id));
1563        try!(writeln!(out, "Message-Id: {}", this_message_id));
1564        if let Some(ref message_id) = in_reply_to_message_id {
1565            try!(writeln!(out, "In-Reply-To: {}", message_id));
1566            try!(writeln!(out, "References: {}", message_id));
1567        }
1568        if first_mail {
1569            in_reply_to_message_id = Some(this_message_id);
1570        }
1571        if no_from {
1572            try!(writeln!(out, "From: {} <{}>", commit_author_name, commit_author_email));
1573        } else {
1574            try!(writeln!(out, "From: {} <{}>", committer_name, committer_email));
1575        }
1576        try!(writeln!(out, "Date: {}", date_822(commit_author.when())));
1577        let prefix = if commits.len() == 1 && cover_entry.is_none() {
1578            if subject_patch.is_empty() {
1579                "".to_string()
1580            } else {
1581                format!("[{}] ", subject_patch)
1582            }
1583        } else {
1584            format!("[{}{}{}/{}] ", subject_patch, ensure_space(&subject_patch), commit_num+1, commits.len())
1585        };
1586        try!(writeln!(out, "Subject: {}{}\n", prefix, subject));
1587
1588        if !no_from && (commit_author_name != committer_name || commit_author_email != committer_email) {
1589            try!(writeln!(out, "From: {} <{}>\n", commit_author_name, commit_author_email));
1590        }
1591        if !body.is_empty() {
1592            try!(write!(out, "{}{}", body, ensure_nl(&body)));
1593        }
1594        try!(writeln!(out, "---"));
1595        try!(writeln!(out, "{}", stats));
1596        try!(write_diff(&mut out, &diffcolors, &diff, false));
1597        if first_mail {
1598            try!(writeln!(out, "\nbase-commit: {}", base.id()));
1599        }
1600        try!(writeln!(out, "{}", signature));
1601    }
1602
1603    Ok(())
1604}
1605
1606fn log(out: &mut Output, repo: &Repository, m: &ArgMatches) -> Result<()> {
1607    let config = try!(try!(repo.config()).snapshot());
1608    try!(out.auto_pager(&config, "log", true));
1609    let diffcolors = try!(DiffColors::new(out, &config));
1610
1611    let shead_id = try!(repo.refname_to_id(SHEAD_REF));
1612    let mut hidden_ids = std::collections::HashSet::new();
1613    let mut commit_stack = Vec::new();
1614    commit_stack.push(shead_id);
1615    while let Some(oid) = commit_stack.pop() {
1616        let commit = try!(repo.find_commit(oid));
1617        let tree = try!(commit.tree());
1618        for parent_id in commit.parent_ids() {
1619            if tree.get_id(parent_id).is_some() {
1620                hidden_ids.insert(parent_id);
1621            } else {
1622                commit_stack.push(parent_id);
1623            }
1624        }
1625    }
1626
1627    let mut revwalk = try!(repo.revwalk());
1628    revwalk.set_sorting(git2::SORT_TOPOLOGICAL);
1629    try!(revwalk.push(shead_id));
1630    for id in hidden_ids {
1631        try!(revwalk.hide(id));
1632    }
1633
1634    let show_diff = m.is_present("patch");
1635
1636    let mut first = true;
1637    for oid in revwalk {
1638        if first {
1639            first = false;
1640        } else {
1641            try!(writeln!(out, ""));
1642        }
1643        let oid = try!(oid);
1644        let commit = try!(repo.find_commit(oid));
1645        let author = commit.author();
1646
1647        try!(writeln!(out, "{}", diffcolors.commit.paint(format!("commit {}", oid))));
1648        try!(writeln!(out, "Author: {} <{}>", author.name().unwrap(), author.email().unwrap()));
1649        try!(writeln!(out, "Date:   {}\n", date_822(author.when())));
1650        for line in commit.message().unwrap().lines() {
1651            try!(writeln!(out, "    {}", line));
1652        }
1653
1654        if show_diff {
1655            let tree = try!(commit.tree());
1656            let parent_ids: Vec<_> = commit.parent_ids().take_while(|parent_id| tree.get_id(*parent_id).is_none()).collect();
1657
1658            try!(writeln!(out, ""));
1659            if parent_ids.len() > 1 {
1660                try!(writeln!(out, "(Diffs of series merge commits not yet supported)"));
1661            } else {
1662                let parent_tree = if parent_ids.len() == 0 {
1663                    None
1664                } else {
1665                    Some(try!(try!(repo.find_commit(parent_ids[0])).tree()))
1666                };
1667                try!(write_series_diff(out, repo, &diffcolors, parent_tree.as_ref(), Some(&tree)));
1668            }
1669        }
1670    }
1671
1672    Ok(())
1673}
1674
1675fn rebase(repo: &Repository, m: &ArgMatches) -> Result<()> {
1676    match repo.state() {
1677        git2::RepositoryState::Clean => (),
1678        git2::RepositoryState::RebaseMerge if repo.path().join("rebase-merge").join("git-series").exists() => {
1679            return Err("git series rebase already in progress.\nUse \"git rebase --continue\" or \"git rebase --abort\".".into());
1680        },
1681        s => { return Err(format!("{:?} in progress; cannot rebase", s).into()); }
1682    }
1683
1684    let internals = try!(Internals::read(repo));
1685    let series = try!(try!(internals.working.get("series")).ok_or("Could not find entry \"series\" in working index"));
1686    let base = try!(try!(internals.working.get("base")).ok_or("Cannot rebase series; no base set.\nUse \"git series base\" to set base."));
1687    if series.id() == base.id() {
1688        return Err("No patches to rebase; series and base identical.".into());
1689    } else if !try!(repo.graph_descendant_of(series.id(), base.id())) {
1690        return Err(format!("Cannot rebase: current base {} not an ancestor of series {}", base.id(), series.id()).into());
1691    }
1692
1693    // Check for unstaged or uncommitted changes before attempting to rebase.
1694    let series_commit = try!(repo.find_commit(series.id()));
1695    let series_tree = try!(series_commit.tree());
1696    let mut unclean = String::new();
1697    if !diff_empty(&try!(repo.diff_tree_to_index(Some(&series_tree), None, None))) {
1698        writeln!(unclean, "Cannot rebase: you have unstaged changes.").unwrap();
1699    }
1700    if !diff_empty(&try!(repo.diff_index_to_workdir(None, None))) {
1701        if unclean.is_empty() {
1702            writeln!(unclean, "Cannot rebase: your index contains uncommitted changes.").unwrap();
1703        } else {
1704            writeln!(unclean, "Additionally, your index contains uncommitted changes.").unwrap();
1705        }
1706    }
1707    if !unclean.is_empty() {
1708        return Err(unclean.into());
1709    }
1710
1711    let mut revwalk = try!(repo.revwalk());
1712    revwalk.set_sorting(git2::SORT_TOPOLOGICAL|git2::SORT_REVERSE);
1713    try!(revwalk.push(series.id()));
1714    try!(revwalk.hide(base.id()));
1715    let commits: Vec<Commit> = try!(revwalk.map(|c| {
1716        let id = try!(c);
1717        let mut commit = try!(repo.find_commit(id));
1718        if commit.parent_ids().count() > 1 {
1719            return Err(format!("Error: cannot rebase merge commit:\n{}", try!(commit_obj_summarize(&mut commit))).into());
1720        }
1721        Ok(commit)
1722    }).collect::<Result<_>>());
1723
1724    let interactive = m.is_present("interactive");
1725    let onto = match m.value_of("onto") {
1726        None => None,
1727        Some(onto) => {
1728            let obj = try!(repo.revparse_single(onto));
1729            let commit = try!(obj.peel(ObjectType::Commit));
1730            Some(commit.id())
1731        },
1732    };
1733
1734    let newbase = onto.unwrap_or(base.id());
1735    if newbase == base.id() && !interactive {
1736        println!("Nothing to do: base unchanged and not rebasing interactively");
1737        return Ok(());
1738    }
1739
1740    let (base_short, _) = try!(commit_summarize_components(&repo, base.id()));
1741    let (newbase_short, _) = try!(commit_summarize_components(&repo, newbase));
1742    let (series_short, _) = try!(commit_summarize_components(&repo, series.id()));
1743
1744    let newbase_obj = try!(repo.find_commit(newbase)).into_object();
1745
1746    let dir = try!(TempDir::new_in(repo.path(), "rebase-merge"));
1747    let final_path = repo.path().join("rebase-merge");
1748    let mut create = std::fs::OpenOptions::new();
1749    create.write(true).create_new(true);
1750
1751    try!(create.open(dir.path().join("git-series")));
1752    try!(create.open(dir.path().join("quiet")));
1753    try!(create.open(dir.path().join("interactive")));
1754
1755    let mut head_name_file = try!(create.open(dir.path().join("head-name")));
1756    try!(writeln!(head_name_file, "detached HEAD"));
1757
1758    let mut onto_file = try!(create.open(dir.path().join("onto")));
1759    try!(writeln!(onto_file, "{}", newbase));
1760
1761    let mut orig_head_file = try!(create.open(dir.path().join("orig-head")));
1762    try!(writeln!(orig_head_file, "{}", series.id()));
1763
1764    let git_rebase_todo_filename = dir.path().join("git-rebase-todo");
1765    let mut git_rebase_todo = try!(create.open(&git_rebase_todo_filename));
1766    for mut commit in commits {
1767        try!(writeln!(git_rebase_todo, "pick {}", try!(commit_obj_summarize(&mut commit))));
1768    }
1769    if let Some(onto) = onto {
1770        try!(writeln!(git_rebase_todo, "exec git series base {}", onto));
1771    }
1772    try!(writeln!(git_rebase_todo, "\n# Rebase {}..{} onto {}", base_short, series_short, newbase_short));
1773    try!(write!(git_rebase_todo, "{}", REBASE_COMMENT));
1774    drop(git_rebase_todo);
1775
1776    // Interactive editor if interactive {
1777    if interactive {
1778        let config = try!(repo.config());
1779        try!(run_editor(&config, &git_rebase_todo_filename));
1780        let mut file = try!(File::open(&git_rebase_todo_filename));
1781        let mut todo = String::new();
1782        try!(file.read_to_string(&mut todo));
1783        let todo = try!(git2::message_prettify(todo, git2::DEFAULT_COMMENT_CHAR));
1784        if todo.is_empty() {
1785            return Err("Nothing to do".into());
1786        }
1787    }
1788
1789    // Avoid races by not calling .into_path until after the rename succeeds.
1790    try!(std::fs::rename(dir.path(), final_path));
1791    dir.into_path();
1792
1793    try!(checkout_tree(repo, &newbase_obj));
1794    try!(repo.reference("HEAD", newbase, true, &format!("rebase -i (start): checkout {}", newbase)));
1795
1796    let status = try!(Command::new("git").arg("rebase").arg("--continue").status());
1797    if !status.success() {
1798        return Err(format!("git rebase --continue exited with status {}", status).into());
1799    }
1800
1801    Ok(())
1802}
1803
1804fn req(out: &mut Output, repo: &Repository, m: &ArgMatches) -> Result<()> {
1805    let config = try!(try!(repo.config()).snapshot());
1806    let shead = try!(repo.find_reference(SHEAD_REF));
1807    let shead_commit = try!(peel_to_commit(try!(shead.resolve())));
1808    let stree = try!(shead_commit.tree());
1809
1810    let series = try!(stree.get_name("series").ok_or("Internal error: series did not contain \"series\""));
1811    let series_id = series.id();
1812    let mut series_commit = try!(repo.find_commit(series_id));
1813    let base = try!(stree.get_name("base").ok_or("Cannot request pull; no base set.\nUse \"git series base\" to set base."));
1814    let mut base_commit = try!(repo.find_commit(base.id()));
1815
1816    let (cover_content, subject, cover_body) = if let Some(entry) = stree.get_name("cover") {
1817        let cover_blob = try!(repo.find_blob(entry.id()));
1818        let content = try!(std::str::from_utf8(cover_blob.content())).to_string();
1819        let (subject, body) = split_message(&content);
1820        (Some(content.to_string()), subject.to_string(), Some(body.to_string()))
1821    } else {
1822        (None, try!(shead_series_name(&shead)), None)
1823    };
1824
1825    let url = m.value_of("url").unwrap();
1826    let tag = m.value_of("tag").unwrap();
1827    let full_tag = format!("refs/tags/{}", tag);
1828    let full_tag_peeled = format!("{}^{{}}", full_tag);
1829    let full_head = format!("refs/heads/{}", tag);
1830    let mut remote = try!(repo.remote_anonymous(url));
1831    try!(remote.connect(git2::Direction::Fetch).map_err(|e| format!("Could not connect to remote repository {}\n{}", url, e)));
1832    let remote_heads = try!(remote.list());
1833
1834    /* Find the requested name as either a tag or head */
1835    let mut opt_remote_tag = None;
1836    let mut opt_remote_tag_peeled = None;
1837    let mut opt_remote_head = None;
1838    for h in remote_heads {
1839        if h.name() == full_tag {
1840            opt_remote_tag = Some(h.oid());
1841        } else if h.name() == full_tag_peeled {
1842            opt_remote_tag_peeled = Some(h.oid());
1843        } else if h.name() == full_head {
1844            opt_remote_head = Some(h.oid());
1845        }
1846    }
1847    let (msg, extra_body, remote_pull_name) = match (opt_remote_tag, opt_remote_tag_peeled, opt_remote_head) {
1848        (Some(remote_tag), Some(remote_tag_peeled), _) => {
1849            if remote_tag_peeled != series_id {
1850                return Err(format!("Remote tag {} does not refer to series {}", tag, series_id).into());
1851            }
1852            let local_tag = try!(repo.find_tag(remote_tag).map_err(|e|
1853                    format!("Could not find remote tag {} ({}) in local repository: {}", tag, remote_tag, e)));
1854            let mut local_tag_msg = local_tag.message().unwrap().to_string();
1855            if let Some(sig_index) = local_tag_msg.find("-----BEGIN PGP ") {
1856                local_tag_msg.truncate(sig_index);
1857            }
1858            let extra_body = match cover_content {
1859                Some(ref content) if !local_tag_msg.contains(content) => cover_body,
1860                _ => None,
1861            };
1862            (Some(local_tag_msg), extra_body, full_tag)
1863        },
1864        (Some(remote_tag), None, _) => {
1865            if remote_tag != series_id {
1866                return Err(format!("Remote unannotated tag {} does not refer to series {}", tag, series_id).into());
1867            }
1868            (cover_content, None, full_tag)
1869        }
1870        (_, _, Some(remote_head)) => {
1871            if remote_head != series_id {
1872                return Err(format!("Remote branch {} does not refer to series {}", tag, series_id).into());
1873            }
1874            (cover_content, None, full_head)
1875        },
1876        _ => {
1877            return Err(format!("Remote does not have either a tag or branch named {}", tag).into())
1878        }
1879    };
1880
1881    let commit_subject_date = |commit: &mut Commit| -> String {
1882        let date = date_822(commit.author().when());
1883        let summary = commit.summary().unwrap();
1884        format!("  {} ({})", summary, date)
1885    };
1886
1887    let mut revwalk = try!(repo.revwalk());
1888    revwalk.set_sorting(git2::SORT_TOPOLOGICAL|git2::SORT_REVERSE);
1889    try!(revwalk.push(series_id));
1890    try!(revwalk.hide(base.id()));
1891    let mut commits: Vec<Commit> = try!(revwalk.map(|c| {
1892        Ok(try!(repo.find_commit(try!(c))))
1893    }).collect::<Result<_>>());
1894    if commits.is_empty() {
1895        return Err("No patches to request pull of; series and base identical.".into());
1896    }
1897
1898    let author = try!(get_signature(&config, "AUTHOR"));
1899    let author_email = author.email().unwrap();
1900    let message_id = format!("<pull.{}.{}.git-series.{}>", shead_commit.id(), author.when().seconds(), author_email);
1901
1902    let diff = try!(repo.diff_tree_to_tree(Some(&base_commit.tree().unwrap()), Some(&series_commit.tree().unwrap()), None));
1903    let stats = try!(diffstat(&diff));
1904
1905    try!(out.auto_pager(&config, "request-pull", true));
1906    let diffcolors = try!(DiffColors::new(out, &config));
1907
1908    try!(writeln!(out, "From {} Mon Sep 17 00:00:00 2001", shead_commit.id()));
1909    try!(writeln!(out, "Message-Id: {}", message_id));
1910    try!(writeln!(out, "From: {} <{}>", author.name().unwrap(), author_email));
1911    try!(writeln!(out, "Date: {}", date_822(author.when())));
1912    try!(writeln!(out, "Subject: [GIT PULL] {}\n", subject));
1913    if let Some(extra_body) = extra_body {
1914        try!(writeln!(out, "{}", extra_body));
1915    }
1916    try!(writeln!(out, "The following changes since commit {}:\n", base.id()));
1917    try!(writeln!(out, "{}\n", commit_subject_date(&mut base_commit)));
1918    try!(writeln!(out, "are available in the git repository at:\n"));
1919    try!(writeln!(out, "  {} {}\n", url, remote_pull_name));
1920    try!(writeln!(out, "for you to fetch changes up to {}:\n", series.id()));
1921    try!(writeln!(out, "{}\n", commit_subject_date(&mut series_commit)));
1922    try!(writeln!(out, "----------------------------------------------------------------"));
1923    if let Some(msg) = msg {
1924        try!(writeln!(out, "{}", msg));
1925        try!(writeln!(out, "----------------------------------------------------------------"));
1926    }
1927    try!(writeln!(out, "{}", shortlog(&mut commits)));
1928    try!(writeln!(out, "{}", stats));
1929    if m.is_present("patch") {
1930        try!(write_diff(out, &diffcolors, &diff, false));
1931    }
1932    try!(writeln!(out, "{}", mail_signature()));
1933
1934    Ok(())
1935}
1936
1937fn main() {
1938    let m = App::new("git-series")
1939            .bin_name("git series")
1940            .about("Track patch series in git")
1941            .author("Josh Triplett <josh@joshtriplett.org>")
1942            .version(crate_version!())
1943            .global_setting(AppSettings::ColoredHelp)
1944            .global_setting(AppSettings::UnifiedHelpMessage)
1945            .global_setting(AppSettings::VersionlessSubcommands)
1946            .subcommands(vec![
1947                SubCommand::with_name("add")
1948                    .about("Add changes to the index for the next series commit")
1949                    .arg_from_usage("<change>... 'Changes to add (\"series\", \"base\", \"cover\")'"),
1950                SubCommand::with_name("base")
1951                    .about("Get or set the base commit for the patch series")
1952                    .arg(Arg::with_name("base").help("Base commit").conflicts_with("delete"))
1953                    .arg_from_usage("-d, --delete 'Clear patch series base'"),
1954                SubCommand::with_name("checkout")
1955                    .about("Resume work on a patch series; check out the current version")
1956                    .arg_from_usage("<name> 'Patch series to check out'"),
1957                SubCommand::with_name("commit")
1958                    .about("Record changes to the patch series")
1959                    .arg_from_usage("-a, --all 'Commit all changes'")
1960                    .arg_from_usage("-m [msg] 'Commit message'")
1961                    .arg_from_usage("-v, --verbose 'Show diff when preparing commit message'"),
1962                SubCommand::with_name("cover")
1963                    .about("Create or edit the cover letter for the patch series")
1964                    .arg_from_usage("-d, --delete 'Delete cover letter'"),
1965                SubCommand::with_name("cp")
1966                    .about("Copy a patch series")
1967                    .arg(Arg::with_name("source_dest").required(true).min_values(1).max_values(2).help("source (default: current series) and destination (required)")),
1968                SubCommand::with_name("delete")
1969                    .about("Delete a patch series")
1970                    .arg_from_usage("<name> 'Patch series to delete'"),
1971                SubCommand::with_name("detach")
1972                    .about("Stop working on any patch series"),
1973                SubCommand::with_name("diff")
1974                    .about("Show changes in the patch series"),
1975                SubCommand::with_name("format")
1976                    .about("Prepare patch series for email")
1977                    .arg_from_usage("--in-reply-to [Message-Id] 'Make the first mail a reply to the specified Message-Id'")
1978                    .arg_from_usage("--no-from 'Don't include in-body \"From:\" headers when formatting patches authored by others'")
1979                    .arg_from_usage("-v, --reroll-count=[N] 'Mark the patch series as PATCH vN'")
1980                    .arg(Arg::from_usage("--rfc 'Use [RFC PATCH] instead of the standard [PATCH] prefix'").conflicts_with("subject-prefix"))
1981                    .arg_from_usage("--stdout 'Write patches to stdout rather than files'")
1982                    .arg_from_usage("--subject-prefix [Subject-Prefix] 'Use [Subject-Prefix] instead of the standard [PATCH] prefix'"),
1983                SubCommand::with_name("log")
1984                    .about("Show the history of the patch series")
1985                    .arg_from_usage("-p, --patch 'Include a patch for each change committed to the series'"),
1986                SubCommand::with_name("mv")
1987                    .about("Move (rename) a patch series")
1988                    .visible_alias("rename")
1989                    .arg(Arg::with_name("source_dest").required(true).min_values(1).max_values(2).help("source (default: current series) and destination (required)")),
1990                SubCommand::with_name("rebase")
1991                    .about("Rebase the patch series")
1992                    .arg_from_usage("[onto] 'Commit to rebase onto'")
1993                    .arg_from_usage("-i, --interactive 'Interactively edit the list of commits'")
1994                    .group(ArgGroup::with_name("action").args(&["onto", "interactive"]).multiple(true).required(true)),
1995                SubCommand::with_name("req")
1996                    .about("Generate a mail requesting a pull of the patch series")
1997                    .visible_aliases(&["pull-request", "request-pull"])
1998                    .arg_from_usage("-p, --patch 'Include patch in the mail'")
1999                    .arg_from_usage("<url> 'Repository URL to request pull of'")
2000                    .arg_from_usage("<tag> 'Tag or branch name to request pull of'"),
2001                SubCommand::with_name("status")
2002                    .about("Show the status of the patch series"),
2003                SubCommand::with_name("start")
2004                    .about("Start a new patch series")
2005                    .arg_from_usage("<name> 'Patch series name'"),
2006                SubCommand::with_name("unadd")
2007                    .about("Undo \"git series add\", removing changes from the next series commit")
2008                    .arg_from_usage("<change>... 'Changes to remove (\"series\", \"base\", \"cover\")'"),
2009            ]).get_matches();
2010
2011    let mut out = Output::new();
2012
2013    let err = || -> Result<()> {
2014        let repo = try!(Repository::discover("."));
2015        match m.subcommand() {
2016            ("", _) => series(&mut out, &repo),
2017            ("add", Some(ref sm)) => add(&repo, &sm),
2018            ("base", Some(ref sm)) => base(&repo, &sm),
2019            ("checkout", Some(ref sm)) => checkout(&repo, &sm),
2020            ("commit", Some(ref sm)) => commit_status(&mut out, &repo, &sm, false),
2021            ("cover", Some(ref sm)) => cover(&repo, &sm),
2022            ("cp", Some(ref sm)) => cp_mv(&repo, &sm, false),
2023            ("delete", Some(ref sm)) => delete(&repo, &sm),
2024            ("detach", _) => detach(&repo),
2025            ("diff", _) => do_diff(&mut out, &repo),
2026            ("format", Some(ref sm)) => format(&mut out, &repo, &sm),
2027            ("log", Some(ref sm)) => log(&mut out, &repo, &sm),
2028            ("mv", Some(ref sm)) => cp_mv(&repo, &sm, true),
2029            ("rebase", Some(ref sm)) => rebase(&repo, &sm),
2030            ("req", Some(ref sm)) => req(&mut out, &repo, &sm),
2031            ("start", Some(ref sm)) => start(&repo, &sm),
2032            ("status", Some(ref sm)) => commit_status(&mut out, &repo, &sm, true),
2033            ("unadd", Some(ref sm)) => unadd(&repo, &sm),
2034            _ => unreachable!()
2035        }
2036    }();
2037
2038    if let Err(e) = err {
2039        let msg = e.to_string();
2040        out.write_err(&format!("{}{}", msg, ensure_nl(&msg)));
2041        drop(out);
2042        std::process::exit(1);
2043    }
2044}