1pub mod arc_cow;
2pub mod archive;
3pub mod command;
4pub mod fs;
5pub mod markdown;
6pub mod paths;
7pub mod serde;
8pub mod size;
9#[cfg(any(test, feature = "test-support"))]
10pub mod test;
11pub mod time;
12
13use anyhow::Result;
14use futures::Future;
15use itertools::Either;
16use regex::Regex;
17use std::sync::{LazyLock, OnceLock};
18use std::{
19 borrow::Cow,
20 cmp::{self, Ordering},
21 env,
22 ops::{AddAssign, Range, RangeInclusive},
23 panic::Location,
24 pin::Pin,
25 task::{Context, Poll},
26 time::Instant,
27};
28use unicase::UniCase;
29
30#[cfg(unix)]
31use anyhow::Context as _;
32
33pub use take_until::*;
34#[cfg(any(test, feature = "test-support"))]
35pub use util_macros::{line_endings, separator, uri};
36
37#[macro_export]
38macro_rules! debug_panic {
39 ( $($fmt_arg:tt)* ) => {
40 if cfg!(debug_assertions) {
41 panic!( $($fmt_arg)* );
42 } else {
43 let backtrace = std::backtrace::Backtrace::capture();
44 log::error!("{}\n{:?}", format_args!($($fmt_arg)*), backtrace);
45 }
46 };
47}
48
49/// A macro to add "C:" to the beginning of a path literal on Windows, and replace all
50/// the separator from `/` to `\`.
51/// But on non-Windows platforms, it will return the path literal as is.
52///
53/// # Examples
54/// ```rust
55/// use util::path;
56///
57/// let path = path!("/Users/user/file.txt");
58/// #[cfg(target_os = "windows")]
59/// assert_eq!(path, "C:\\Users\\user\\file.txt");
60/// #[cfg(not(target_os = "windows"))]
61/// assert_eq!(path, "/Users/user/file.txt");
62/// ```
63#[cfg(all(any(test, feature = "test-support"), target_os = "windows"))]
64#[macro_export]
65macro_rules! path {
66 ($path:literal) => {
67 concat!("C:", util::separator!($path))
68 };
69}
70
71/// A macro to add "C:" to the beginning of a path literal on Windows, and replace all
72/// the separator from `/` to `\`.
73/// But on non-Windows platforms, it will return the path literal as is.
74///
75/// # Examples
76/// ```rust
77/// use util::path;
78///
79/// let path = path!("/Users/user/file.txt");
80/// #[cfg(target_os = "windows")]
81/// assert_eq!(path, "C:\\Users\\user\\file.txt");
82/// #[cfg(not(target_os = "windows"))]
83/// assert_eq!(path, "/Users/user/file.txt");
84/// ```
85#[cfg(all(any(test, feature = "test-support"), not(target_os = "windows")))]
86#[macro_export]
87macro_rules! path {
88 ($path:literal) => {
89 $path
90 };
91}
92
93pub fn truncate(s: &str, max_chars: usize) -> &str {
94 match s.char_indices().nth(max_chars) {
95 None => s,
96 Some((idx, _)) => &s[..idx],
97 }
98}
99
100/// Removes characters from the end of the string if its length is greater than `max_chars` and
101/// appends "..." to the string. Returns string unchanged if its length is smaller than max_chars.
102pub fn truncate_and_trailoff(s: &str, max_chars: usize) -> String {
103 debug_assert!(max_chars >= 5);
104
105 // If the string's byte length is <= max_chars, walking the string can be skipped since the
106 // number of chars is <= the number of bytes.
107 if s.len() <= max_chars {
108 return s.to_string();
109 }
110 let truncation_ix = s.char_indices().map(|(i, _)| i).nth(max_chars);
111 match truncation_ix {
112 Some(index) => s[..index].to_string() + "β¦",
113 _ => s.to_string(),
114 }
115}
116
117/// Removes characters from the front of the string if its length is greater than `max_chars` and
118/// prepends the string with "...". Returns string unchanged if its length is smaller than max_chars.
119pub fn truncate_and_remove_front(s: &str, max_chars: usize) -> String {
120 debug_assert!(max_chars >= 5);
121
122 // If the string's byte length is <= max_chars, walking the string can be skipped since the
123 // number of chars is <= the number of bytes.
124 if s.len() <= max_chars {
125 return s.to_string();
126 }
127 let suffix_char_length = max_chars.saturating_sub(1);
128 let truncation_ix = s
129 .char_indices()
130 .map(|(i, _)| i)
131 .nth_back(suffix_char_length);
132 match truncation_ix {
133 Some(index) if index > 0 => "β¦".to_string() + &s[index..],
134 _ => s.to_string(),
135 }
136}
137
138/// Takes only `max_lines` from the string and, if there were more than `max_lines-1`, appends a
139/// a newline and "..." to the string, so that `max_lines` are returned.
140/// Returns string unchanged if its length is smaller than max_lines.
141pub fn truncate_lines_and_trailoff(s: &str, max_lines: usize) -> String {
142 let mut lines = s.lines().take(max_lines).collect::<Vec<_>>();
143 if lines.len() > max_lines - 1 {
144 lines.pop();
145 lines.join("\n") + "\nβ¦"
146 } else {
147 lines.join("\n")
148 }
149}
150
151/// Truncates the string at a character boundary, such that the result is less than `max_bytes` in
152/// length.
153pub fn truncate_to_byte_limit(s: &str, max_bytes: usize) -> &str {
154 if s.len() < max_bytes {
155 return s;
156 }
157
158 for i in (0..max_bytes).rev() {
159 if s.is_char_boundary(i) {
160 return &s[..i];
161 }
162 }
163
164 ""
165}
166
167/// Takes a prefix of complete lines which fit within the byte limit. If the first line is longer
168/// than the limit, truncates at a character boundary.
169pub fn truncate_lines_to_byte_limit(s: &str, max_bytes: usize) -> &str {
170 if s.len() < max_bytes {
171 return s;
172 }
173
174 for i in (0..max_bytes).rev() {
175 if s.is_char_boundary(i) {
176 if s.as_bytes()[i] == b'\n' {
177 // Since the i-th character is \n, valid to slice at i + 1.
178 return &s[..i + 1];
179 }
180 }
181 }
182
183 truncate_to_byte_limit(s, max_bytes)
184}
185
186#[test]
187fn test_truncate_lines_to_byte_limit() {
188 let text = "Line 1\nLine 2\nLine 3\nLine 4";
189
190 // Limit that includes all lines
191 assert_eq!(truncate_lines_to_byte_limit(text, 100), text);
192
193 // Exactly the first line
194 assert_eq!(truncate_lines_to_byte_limit(text, 7), "Line 1\n");
195
196 // Limit between lines
197 assert_eq!(truncate_lines_to_byte_limit(text, 13), "Line 1\n");
198 assert_eq!(truncate_lines_to_byte_limit(text, 20), "Line 1\nLine 2\n");
199
200 // Limit before first newline
201 assert_eq!(truncate_lines_to_byte_limit(text, 6), "Line ");
202
203 // Test with non-ASCII characters
204 let text_utf8 = "Line 1\nLΓne 2\nLine 3";
205 assert_eq!(
206 truncate_lines_to_byte_limit(text_utf8, 15),
207 "Line 1\nLΓne 2\n"
208 );
209}
210
211pub fn post_inc<T: From<u8> + AddAssign<T> + Copy>(value: &mut T) -> T {
212 let prev = *value;
213 *value += T::from(1);
214 prev
215}
216
217/// Extend a sorted vector with a sorted sequence of items, maintaining the vector's sort order and
218/// enforcing a maximum length. This also de-duplicates items. Sort the items according to the given callback. Before calling this,
219/// both `vec` and `new_items` should already be sorted according to the `cmp` comparator.
220pub fn extend_sorted<T, I, F>(vec: &mut Vec<T>, new_items: I, limit: usize, mut cmp: F)
221where
222 I: IntoIterator<Item = T>,
223 F: FnMut(&T, &T) -> Ordering,
224{
225 let mut start_index = 0;
226 for new_item in new_items {
227 if let Err(i) = vec[start_index..].binary_search_by(|m| cmp(m, &new_item)) {
228 let index = start_index + i;
229 if vec.len() < limit {
230 vec.insert(index, new_item);
231 } else if index < vec.len() {
232 vec.pop();
233 vec.insert(index, new_item);
234 }
235 start_index = index;
236 }
237 }
238}
239
240pub fn truncate_to_bottom_n_sorted_by<T, F>(items: &mut Vec<T>, limit: usize, compare: &F)
241where
242 F: Fn(&T, &T) -> Ordering,
243{
244 if limit == 0 {
245 items.truncate(0);
246 }
247 if items.len() <= limit {
248 items.sort_by(compare);
249 return;
250 }
251 // When limit is near to items.len() it may be more efficient to sort the whole list and
252 // truncate, rather than always doing selection first as is done below. It's hard to analyze
253 // where the threshold for this should be since the quickselect style algorithm used by
254 // `select_nth_unstable_by` makes the prefix partially sorted, and so its work is not wasted -
255 // the expected number of comparisons needed by `sort_by` is less than it is for some arbitrary
256 // unsorted input.
257 items.select_nth_unstable_by(limit, compare);
258 items.truncate(limit);
259 items.sort_by(compare);
260}
261
262#[cfg(unix)]
263fn load_shell_from_passwd() -> Result<()> {
264 let buflen = match unsafe { libc::sysconf(libc::_SC_GETPW_R_SIZE_MAX) } {
265 n if n < 0 => 1024,
266 n => n as usize,
267 };
268 let mut buffer = Vec::with_capacity(buflen);
269
270 let mut pwd: std::mem::MaybeUninit<libc::passwd> = std::mem::MaybeUninit::uninit();
271 let mut result: *mut libc::passwd = std::ptr::null_mut();
272
273 let uid = unsafe { libc::getuid() };
274 let status = unsafe {
275 libc::getpwuid_r(
276 uid,
277 pwd.as_mut_ptr(),
278 buffer.as_mut_ptr() as *mut libc::c_char,
279 buflen,
280 &mut result,
281 )
282 };
283 let entry = unsafe { pwd.assume_init() };
284
285 anyhow::ensure!(
286 status == 0,
287 "call to getpwuid_r failed. uid: {}, status: {}",
288 uid,
289 status
290 );
291 anyhow::ensure!(!result.is_null(), "passwd entry for uid {} not found", uid);
292 anyhow::ensure!(
293 entry.pw_uid == uid,
294 "passwd entry has different uid ({}) than getuid ({}) returned",
295 entry.pw_uid,
296 uid,
297 );
298
299 let shell = unsafe { std::ffi::CStr::from_ptr(entry.pw_shell).to_str().unwrap() };
300 if env::var("SHELL").map_or(true, |shell_env| shell_env != shell) {
301 log::info!(
302 "updating SHELL environment variable to value from passwd entry: {:?}",
303 shell,
304 );
305 unsafe { env::set_var("SHELL", shell) };
306 }
307
308 Ok(())
309}
310
311#[cfg(unix)]
312pub fn load_login_shell_environment() -> Result<()> {
313 load_shell_from_passwd().log_err();
314
315 let marker = "ZED_LOGIN_SHELL_START";
316 let shell = env::var("SHELL").context(
317 "SHELL environment variable is not assigned so we can't source login environment variables",
318 )?;
319
320 // If possible, we want to `cd` in the user's `$HOME` to trigger programs
321 // such as direnv, asdf, mise, ... to adjust the PATH. These tools often hook
322 // into shell's `cd` command (and hooks) to manipulate env.
323 // We do this so that we get the env a user would have when spawning a shell
324 // in home directory.
325 let shell_cmd_prefix = std::env::var_os("HOME")
326 .and_then(|home| home.into_string().ok())
327 .map(|home| format!("cd '{home}';"));
328
329 let shell_cmd = format!(
330 "{}printf '%s' {marker}; /usr/bin/env;",
331 shell_cmd_prefix.as_deref().unwrap_or("")
332 );
333
334 let output = set_pre_exec_to_start_new_session(
335 std::process::Command::new(&shell).args(["-l", "-i", "-c", &shell_cmd]),
336 )
337 .output()
338 .context("failed to spawn login shell to source login environment variables")?;
339 anyhow::ensure!(output.status.success(), "login shell exited with error");
340
341 let stdout = String::from_utf8_lossy(&output.stdout);
342
343 if let Some(env_output_start) = stdout.find(marker) {
344 let env_output = &stdout[env_output_start + marker.len()..];
345
346 parse_env_output(env_output, |key, value| unsafe { env::set_var(key, value) });
347
348 log::info!(
349 "set environment variables from shell:{}, path:{}",
350 shell,
351 env::var("PATH").unwrap_or_default(),
352 );
353 }
354
355 Ok(())
356}
357
358/// Configures the process to start a new session, to prevent interactive shells from taking control
359/// of the terminal.
360///
361/// For more details: https://registerspill.thorstenball.com/p/how-to-lose-control-of-your-shell
362pub fn set_pre_exec_to_start_new_session(
363 command: &mut std::process::Command,
364) -> &mut std::process::Command {
365 // safety: code in pre_exec should be signal safe.
366 // https://man7.org/linux/man-pages/man7/signal-safety.7.html
367 #[cfg(not(target_os = "windows"))]
368 unsafe {
369 use std::os::unix::process::CommandExt;
370 command.pre_exec(|| {
371 libc::setsid();
372 Ok(())
373 });
374 };
375 command
376}
377
378/// Parse the result of calling `usr/bin/env` with no arguments
379pub fn parse_env_output(env: &str, mut f: impl FnMut(String, String)) {
380 let mut current_key: Option<String> = None;
381 let mut current_value: Option<String> = None;
382
383 for line in env.split_terminator('\n') {
384 if let Some(separator_index) = line.find('=') {
385 if !line[..separator_index].is_empty() {
386 if let Some((key, value)) = Option::zip(current_key.take(), current_value.take()) {
387 f(key, value)
388 }
389 current_key = Some(line[..separator_index].to_string());
390 current_value = Some(line[separator_index + 1..].to_string());
391 continue;
392 };
393 }
394 if let Some(value) = current_value.as_mut() {
395 value.push('\n');
396 value.push_str(line);
397 }
398 }
399 if let Some((key, value)) = Option::zip(current_key.take(), current_value.take()) {
400 f(key, value)
401 }
402}
403
404pub fn merge_json_lenient_value_into(
405 source: serde_json_lenient::Value,
406 target: &mut serde_json_lenient::Value,
407) {
408 match (source, target) {
409 (serde_json_lenient::Value::Object(source), serde_json_lenient::Value::Object(target)) => {
410 for (key, value) in source {
411 if let Some(target) = target.get_mut(&key) {
412 merge_json_lenient_value_into(value, target);
413 } else {
414 target.insert(key, value);
415 }
416 }
417 }
418
419 (serde_json_lenient::Value::Array(source), serde_json_lenient::Value::Array(target)) => {
420 for value in source {
421 target.push(value);
422 }
423 }
424
425 (source, target) => *target = source,
426 }
427}
428
429pub fn merge_json_value_into(source: serde_json::Value, target: &mut serde_json::Value) {
430 use serde_json::Value;
431
432 match (source, target) {
433 (Value::Object(source), Value::Object(target)) => {
434 for (key, value) in source {
435 if let Some(target) = target.get_mut(&key) {
436 merge_json_value_into(value, target);
437 } else {
438 target.insert(key, value);
439 }
440 }
441 }
442
443 (Value::Array(source), Value::Array(target)) => {
444 for value in source {
445 target.push(value);
446 }
447 }
448
449 (source, target) => *target = source,
450 }
451}
452
453pub fn merge_non_null_json_value_into(source: serde_json::Value, target: &mut serde_json::Value) {
454 use serde_json::Value;
455 if let Value::Object(source_object) = source {
456 let target_object = if let Value::Object(target) = target {
457 target
458 } else {
459 *target = Value::Object(Default::default());
460 target.as_object_mut().unwrap()
461 };
462 for (key, value) in source_object {
463 if let Some(target) = target_object.get_mut(&key) {
464 merge_non_null_json_value_into(value, target);
465 } else if !value.is_null() {
466 target_object.insert(key, value);
467 }
468 }
469 } else if !source.is_null() {
470 *target = source
471 }
472}
473
474pub fn measure<R>(label: &str, f: impl FnOnce() -> R) -> R {
475 static ZED_MEASUREMENTS: OnceLock<bool> = OnceLock::new();
476 let zed_measurements = ZED_MEASUREMENTS.get_or_init(|| {
477 env::var("ZED_MEASUREMENTS")
478 .map(|measurements| measurements == "1" || measurements == "true")
479 .unwrap_or(false)
480 });
481
482 if *zed_measurements {
483 let start = Instant::now();
484 let result = f();
485 let elapsed = start.elapsed();
486 eprintln!("{}: {:?}", label, elapsed);
487 result
488 } else {
489 f()
490 }
491}
492
493pub fn expanded_and_wrapped_usize_range(
494 range: Range<usize>,
495 additional_before: usize,
496 additional_after: usize,
497 wrap_length: usize,
498) -> impl Iterator<Item = usize> {
499 let start_wraps = range.start < additional_before;
500 let end_wraps = wrap_length < range.end + additional_after;
501 if start_wraps && end_wraps {
502 Either::Left(0..wrap_length)
503 } else if start_wraps {
504 let wrapped_start = (range.start + wrap_length).saturating_sub(additional_before);
505 if wrapped_start <= range.end {
506 Either::Left(0..wrap_length)
507 } else {
508 Either::Right((0..range.end + additional_after).chain(wrapped_start..wrap_length))
509 }
510 } else if end_wraps {
511 let wrapped_end = range.end + additional_after - wrap_length;
512 if range.start <= wrapped_end {
513 Either::Left(0..wrap_length)
514 } else {
515 Either::Right((0..wrapped_end).chain(range.start - additional_before..wrap_length))
516 }
517 } else {
518 Either::Left((range.start - additional_before)..(range.end + additional_after))
519 }
520}
521
522/// Yields `[i, i + 1, i - 1, i + 2, ..]`, each modulo `wrap_length` and bounded by
523/// `additional_before` and `additional_after`. If the wrapping causes overlap, duplicates are not
524/// emitted. If wrap_length is 0, nothing is yielded.
525pub fn wrapped_usize_outward_from(
526 start: usize,
527 additional_before: usize,
528 additional_after: usize,
529 wrap_length: usize,
530) -> impl Iterator<Item = usize> {
531 let mut count = 0;
532 let mut after_offset = 1;
533 let mut before_offset = 1;
534
535 std::iter::from_fn(move || {
536 count += 1;
537 if count > wrap_length {
538 None
539 } else if count == 1 {
540 Some(start % wrap_length)
541 } else if after_offset <= additional_after && after_offset <= before_offset {
542 let value = (start + after_offset) % wrap_length;
543 after_offset += 1;
544 Some(value)
545 } else if before_offset <= additional_before {
546 let value = (start + wrap_length - before_offset) % wrap_length;
547 before_offset += 1;
548 Some(value)
549 } else if after_offset <= additional_after {
550 let value = (start + after_offset) % wrap_length;
551 after_offset += 1;
552 Some(value)
553 } else {
554 None
555 }
556 })
557}
558
559#[cfg(target_os = "windows")]
560pub fn get_windows_system_shell() -> String {
561 use std::path::PathBuf;
562
563 fn find_pwsh_in_programfiles(find_alternate: bool, find_preview: bool) -> Option<PathBuf> {
564 #[cfg(target_pointer_width = "64")]
565 let env_var = if find_alternate {
566 "ProgramFiles(x86)"
567 } else {
568 "ProgramFiles"
569 };
570
571 #[cfg(target_pointer_width = "32")]
572 let env_var = if find_alternate {
573 "ProgramW6432"
574 } else {
575 "ProgramFiles"
576 };
577
578 let install_base_dir = PathBuf::from(std::env::var_os(env_var)?).join("PowerShell");
579 install_base_dir
580 .read_dir()
581 .ok()?
582 .filter_map(Result::ok)
583 .filter(|entry| matches!(entry.file_type(), Ok(ft) if ft.is_dir()))
584 .filter_map(|entry| {
585 let dir_name = entry.file_name();
586 let dir_name = dir_name.to_string_lossy();
587
588 let version = if find_preview {
589 let dash_index = dir_name.find('-')?;
590 if &dir_name[dash_index + 1..] != "preview" {
591 return None;
592 };
593 dir_name[..dash_index].parse::<u32>().ok()?
594 } else {
595 dir_name.parse::<u32>().ok()?
596 };
597
598 let exe_path = entry.path().join("pwsh.exe");
599 if exe_path.exists() {
600 Some((version, exe_path))
601 } else {
602 None
603 }
604 })
605 .max_by_key(|(version, _)| *version)
606 .map(|(_, path)| path)
607 }
608
609 fn find_pwsh_in_msix(find_preview: bool) -> Option<PathBuf> {
610 let msix_app_dir =
611 PathBuf::from(std::env::var_os("LOCALAPPDATA")?).join("Microsoft\\WindowsApps");
612 if !msix_app_dir.exists() {
613 return None;
614 }
615
616 let prefix = if find_preview {
617 "Microsoft.PowerShellPreview_"
618 } else {
619 "Microsoft.PowerShell_"
620 };
621 msix_app_dir
622 .read_dir()
623 .ok()?
624 .filter_map(|entry| {
625 let entry = entry.ok()?;
626 if !matches!(entry.file_type(), Ok(ft) if ft.is_dir()) {
627 return None;
628 }
629
630 if !entry.file_name().to_string_lossy().starts_with(prefix) {
631 return None;
632 }
633
634 let exe_path = entry.path().join("pwsh.exe");
635 exe_path.exists().then_some(exe_path)
636 })
637 .next()
638 }
639
640 fn find_pwsh_in_scoop() -> Option<PathBuf> {
641 let pwsh_exe =
642 PathBuf::from(std::env::var_os("USERPROFILE")?).join("scoop\\shims\\pwsh.exe");
643 pwsh_exe.exists().then_some(pwsh_exe)
644 }
645
646 static SYSTEM_SHELL: LazyLock<String> = LazyLock::new(|| {
647 find_pwsh_in_programfiles(false, false)
648 .or_else(|| find_pwsh_in_programfiles(true, false))
649 .or_else(|| find_pwsh_in_msix(false))
650 .or_else(|| find_pwsh_in_programfiles(false, true))
651 .or_else(|| find_pwsh_in_msix(true))
652 .or_else(|| find_pwsh_in_programfiles(true, true))
653 .or_else(find_pwsh_in_scoop)
654 .map(|p| p.to_string_lossy().to_string())
655 .unwrap_or("powershell.exe".to_string())
656 });
657
658 (*SYSTEM_SHELL).clone()
659}
660
661pub trait ResultExt<E> {
662 type Ok;
663
664 fn log_err(self) -> Option<Self::Ok>;
665 /// Assert that this result should never be an error in development or tests.
666 fn debug_assert_ok(self, reason: &str) -> Self;
667 fn warn_on_err(self) -> Option<Self::Ok>;
668 fn log_with_level(self, level: log::Level) -> Option<Self::Ok>;
669 fn anyhow(self) -> anyhow::Result<Self::Ok>
670 where
671 E: Into<anyhow::Error>;
672}
673
674impl<T, E> ResultExt<E> for Result<T, E>
675where
676 E: std::fmt::Debug,
677{
678 type Ok = T;
679
680 #[track_caller]
681 fn log_err(self) -> Option<T> {
682 self.log_with_level(log::Level::Error)
683 }
684
685 #[track_caller]
686 fn debug_assert_ok(self, reason: &str) -> Self {
687 if let Err(error) = &self {
688 debug_panic!("{reason} - {error:?}");
689 }
690 self
691 }
692
693 #[track_caller]
694 fn warn_on_err(self) -> Option<T> {
695 self.log_with_level(log::Level::Warn)
696 }
697
698 #[track_caller]
699 fn log_with_level(self, level: log::Level) -> Option<T> {
700 match self {
701 Ok(value) => Some(value),
702 Err(error) => {
703 log_error_with_caller(*Location::caller(), error, level);
704 None
705 }
706 }
707 }
708
709 fn anyhow(self) -> anyhow::Result<T>
710 where
711 E: Into<anyhow::Error>,
712 {
713 self.map_err(Into::into)
714 }
715}
716
717fn log_error_with_caller<E>(caller: core::panic::Location<'_>, error: E, level: log::Level)
718where
719 E: std::fmt::Debug,
720{
721 #[cfg(not(target_os = "windows"))]
722 let file = caller.file();
723 #[cfg(target_os = "windows")]
724 let file = caller.file().replace('\\', "/");
725 // In this codebase, the first segment of the file path is
726 // the 'crates' folder, followed by the crate name.
727 let target = file.split('/').nth(1);
728
729 log::logger().log(
730 &log::Record::builder()
731 .target(target.unwrap_or(""))
732 .module_path(target)
733 .args(format_args!("{:?}", error))
734 .file(Some(caller.file()))
735 .line(Some(caller.line()))
736 .level(level)
737 .build(),
738 );
739}
740
741pub fn log_err<E: std::fmt::Debug>(error: &E) {
742 log_error_with_caller(*Location::caller(), error, log::Level::Warn);
743}
744
745pub trait TryFutureExt {
746 fn log_err(self) -> LogErrorFuture<Self>
747 where
748 Self: Sized;
749
750 fn log_tracked_err(self, location: core::panic::Location<'static>) -> LogErrorFuture<Self>
751 where
752 Self: Sized;
753
754 fn warn_on_err(self) -> LogErrorFuture<Self>
755 where
756 Self: Sized;
757 fn unwrap(self) -> UnwrapFuture<Self>
758 where
759 Self: Sized;
760}
761
762impl<F, T, E> TryFutureExt for F
763where
764 F: Future<Output = Result<T, E>>,
765 E: std::fmt::Debug,
766{
767 #[track_caller]
768 fn log_err(self) -> LogErrorFuture<Self>
769 where
770 Self: Sized,
771 {
772 let location = Location::caller();
773 LogErrorFuture(self, log::Level::Error, *location)
774 }
775
776 fn log_tracked_err(self, location: core::panic::Location<'static>) -> LogErrorFuture<Self>
777 where
778 Self: Sized,
779 {
780 LogErrorFuture(self, log::Level::Error, location)
781 }
782
783 #[track_caller]
784 fn warn_on_err(self) -> LogErrorFuture<Self>
785 where
786 Self: Sized,
787 {
788 let location = Location::caller();
789 LogErrorFuture(self, log::Level::Warn, *location)
790 }
791
792 fn unwrap(self) -> UnwrapFuture<Self>
793 where
794 Self: Sized,
795 {
796 UnwrapFuture(self)
797 }
798}
799
800#[must_use]
801pub struct LogErrorFuture<F>(F, log::Level, core::panic::Location<'static>);
802
803impl<F, T, E> Future for LogErrorFuture<F>
804where
805 F: Future<Output = Result<T, E>>,
806 E: std::fmt::Debug,
807{
808 type Output = Option<T>;
809
810 fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
811 let level = self.1;
812 let location = self.2;
813 let inner = unsafe { Pin::new_unchecked(&mut self.get_unchecked_mut().0) };
814 match inner.poll(cx) {
815 Poll::Ready(output) => Poll::Ready(match output {
816 Ok(output) => Some(output),
817 Err(error) => {
818 log_error_with_caller(location, error, level);
819 None
820 }
821 }),
822 Poll::Pending => Poll::Pending,
823 }
824 }
825}
826
827pub struct UnwrapFuture<F>(F);
828
829impl<F, T, E> Future for UnwrapFuture<F>
830where
831 F: Future<Output = Result<T, E>>,
832 E: std::fmt::Debug,
833{
834 type Output = T;
835
836 fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
837 let inner = unsafe { Pin::new_unchecked(&mut self.get_unchecked_mut().0) };
838 match inner.poll(cx) {
839 Poll::Ready(result) => Poll::Ready(result.unwrap()),
840 Poll::Pending => Poll::Pending,
841 }
842 }
843}
844
845pub struct Deferred<F: FnOnce()>(Option<F>);
846
847impl<F: FnOnce()> Deferred<F> {
848 /// Drop without running the deferred function.
849 pub fn abort(mut self) {
850 self.0.take();
851 }
852}
853
854impl<F: FnOnce()> Drop for Deferred<F> {
855 fn drop(&mut self) {
856 if let Some(f) = self.0.take() {
857 f()
858 }
859 }
860}
861
862/// Run the given function when the returned value is dropped (unless it's cancelled).
863#[must_use]
864pub fn defer<F: FnOnce()>(f: F) -> Deferred<F> {
865 Deferred(Some(f))
866}
867
868#[cfg(any(test, feature = "test-support"))]
869mod rng {
870 use rand::{Rng, seq::SliceRandom};
871 pub struct RandomCharIter<T: Rng> {
872 rng: T,
873 simple_text: bool,
874 }
875
876 impl<T: Rng> RandomCharIter<T> {
877 pub fn new(rng: T) -> Self {
878 Self {
879 rng,
880 simple_text: std::env::var("SIMPLE_TEXT").map_or(false, |v| !v.is_empty()),
881 }
882 }
883
884 pub fn with_simple_text(mut self) -> Self {
885 self.simple_text = true;
886 self
887 }
888 }
889
890 impl<T: Rng> Iterator for RandomCharIter<T> {
891 type Item = char;
892
893 fn next(&mut self) -> Option<Self::Item> {
894 if self.simple_text {
895 return if self.rng.gen_range(0..100) < 5 {
896 Some('\n')
897 } else {
898 Some(self.rng.gen_range(b'a'..b'z' + 1).into())
899 };
900 }
901
902 match self.rng.gen_range(0..100) {
903 // whitespace
904 0..=19 => [' ', '\n', '\r', '\t'].choose(&mut self.rng).copied(),
905 // two-byte greek letters
906 20..=32 => char::from_u32(self.rng.gen_range(('Ξ±' as u32)..('Ο' as u32 + 1))),
907 // // three-byte characters
908 33..=45 => ['β', 'β
', 'β', 'β', 'β']
909 .choose(&mut self.rng)
910 .copied(),
911 // // four-byte characters
912 46..=58 => ['π', 'π', 'π', 'π'].choose(&mut self.rng).copied(),
913 // ascii letters
914 _ => Some(self.rng.gen_range(b'a'..b'z' + 1).into()),
915 }
916 }
917 }
918}
919#[cfg(any(test, feature = "test-support"))]
920pub use rng::RandomCharIter;
921/// Get an embedded file as a string.
922pub fn asset_str<A: rust_embed::RustEmbed>(path: &str) -> Cow<'static, str> {
923 match A::get(path).expect(path).data {
924 Cow::Borrowed(bytes) => Cow::Borrowed(std::str::from_utf8(bytes).unwrap()),
925 Cow::Owned(bytes) => Cow::Owned(String::from_utf8(bytes).unwrap()),
926 }
927}
928
929/// Expands to an immediately-invoked function expression. Good for using the ? operator
930/// in functions which do not return an Option or Result.
931///
932/// Accepts a normal block, an async block, or an async move block.
933#[macro_export]
934macro_rules! maybe {
935 ($block:block) => {
936 (|| $block)()
937 };
938 (async $block:block) => {
939 (|| async $block)()
940 };
941 (async move $block:block) => {
942 (|| async move $block)()
943 };
944}
945
946pub trait RangeExt<T> {
947 fn sorted(&self) -> Self;
948 fn to_inclusive(&self) -> RangeInclusive<T>;
949 fn overlaps(&self, other: &Range<T>) -> bool;
950 fn contains_inclusive(&self, other: &Range<T>) -> bool;
951}
952
953impl<T: Ord + Clone> RangeExt<T> for Range<T> {
954 fn sorted(&self) -> Self {
955 cmp::min(&self.start, &self.end).clone()..cmp::max(&self.start, &self.end).clone()
956 }
957
958 fn to_inclusive(&self) -> RangeInclusive<T> {
959 self.start.clone()..=self.end.clone()
960 }
961
962 fn overlaps(&self, other: &Range<T>) -> bool {
963 self.start < other.end && other.start < self.end
964 }
965
966 fn contains_inclusive(&self, other: &Range<T>) -> bool {
967 self.start <= other.start && other.end <= self.end
968 }
969}
970
971impl<T: Ord + Clone> RangeExt<T> for RangeInclusive<T> {
972 fn sorted(&self) -> Self {
973 cmp::min(self.start(), self.end()).clone()..=cmp::max(self.start(), self.end()).clone()
974 }
975
976 fn to_inclusive(&self) -> RangeInclusive<T> {
977 self.clone()
978 }
979
980 fn overlaps(&self, other: &Range<T>) -> bool {
981 self.start() < &other.end && &other.start <= self.end()
982 }
983
984 fn contains_inclusive(&self, other: &Range<T>) -> bool {
985 self.start() <= &other.start && &other.end <= self.end()
986 }
987}
988
989/// A way to sort strings with starting numbers numerically first, falling back to alphanumeric one,
990/// case-insensitive.
991///
992/// This is useful for turning regular alphanumerically sorted sequences as `1-abc, 10, 11-def, .., 2, 21-abc`
993/// into `1-abc, 2, 10, 11-def, .., 21-abc`
994#[derive(Debug, PartialEq, Eq)]
995pub struct NumericPrefixWithSuffix<'a>(Option<u64>, &'a str);
996
997impl<'a> NumericPrefixWithSuffix<'a> {
998 pub fn from_numeric_prefixed_str(str: &'a str) -> Self {
999 let i = str.chars().take_while(|c| c.is_ascii_digit()).count();
1000 let (prefix, remainder) = str.split_at(i);
1001
1002 let prefix = prefix.parse().ok();
1003 Self(prefix, remainder)
1004 }
1005}
1006
1007/// When dealing with equality, we need to consider the case of the strings to achieve strict equality
1008/// to handle cases like "a" < "A" instead of "a" == "A".
1009impl Ord for NumericPrefixWithSuffix<'_> {
1010 fn cmp(&self, other: &Self) -> Ordering {
1011 match (self.0, other.0) {
1012 (None, None) => UniCase::new(self.1)
1013 .cmp(&UniCase::new(other.1))
1014 .then_with(|| self.1.cmp(other.1).reverse()),
1015 (None, Some(_)) => Ordering::Greater,
1016 (Some(_), None) => Ordering::Less,
1017 (Some(a), Some(b)) => a.cmp(&b).then_with(|| {
1018 UniCase::new(self.1)
1019 .cmp(&UniCase::new(other.1))
1020 .then_with(|| self.1.cmp(other.1).reverse())
1021 }),
1022 }
1023 }
1024}
1025
1026impl PartialOrd for NumericPrefixWithSuffix<'_> {
1027 fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
1028 Some(self.cmp(other))
1029 }
1030}
1031
1032/// Capitalizes the first character of a string.
1033///
1034/// This function takes a string slice as input and returns a new `String` with the first character
1035/// capitalized.
1036///
1037/// # Examples
1038///
1039/// ```
1040/// use util::capitalize;
1041///
1042/// assert_eq!(capitalize("hello"), "Hello");
1043/// assert_eq!(capitalize("WORLD"), "WORLD");
1044/// assert_eq!(capitalize(""), "");
1045/// ```
1046pub fn capitalize(str: &str) -> String {
1047 let mut chars = str.chars();
1048 match chars.next() {
1049 None => String::new(),
1050 Some(first_char) => first_char.to_uppercase().collect::<String>() + chars.as_str(),
1051 }
1052}
1053
1054fn emoji_regex() -> &'static Regex {
1055 static EMOJI_REGEX: LazyLock<Regex> =
1056 LazyLock::new(|| Regex::new("(\\p{Emoji}|\u{200D})").unwrap());
1057 &EMOJI_REGEX
1058}
1059
1060/// Returns true if the given string consists of emojis only.
1061/// E.g. "π¨βπ©βπ§βπ§π" will return true, but "π!" will return false.
1062pub fn word_consists_of_emojis(s: &str) -> bool {
1063 let mut prev_end = 0;
1064 for capture in emoji_regex().find_iter(s) {
1065 if capture.start() != prev_end {
1066 return false;
1067 }
1068 prev_end = capture.end();
1069 }
1070 prev_end == s.len()
1071}
1072
1073/// Similar to `str::split`, but also provides byte-offset ranges of the results. Unlike
1074/// `str::split`, this is not generic on pattern types and does not return an `Iterator`.
1075pub fn split_str_with_ranges(s: &str, pat: impl Fn(char) -> bool) -> Vec<(Range<usize>, &str)> {
1076 let mut result = Vec::new();
1077 let mut start = 0;
1078
1079 for (i, ch) in s.char_indices() {
1080 if pat(ch) {
1081 if i > start {
1082 result.push((start..i, &s[start..i]));
1083 }
1084 start = i + ch.len_utf8();
1085 }
1086 }
1087
1088 if s.len() > start {
1089 result.push((start..s.len(), &s[start..s.len()]));
1090 }
1091
1092 result
1093}
1094
1095pub fn default<D: Default>() -> D {
1096 Default::default()
1097}
1098
1099pub fn get_system_shell() -> String {
1100 #[cfg(target_os = "windows")]
1101 {
1102 get_windows_system_shell()
1103 }
1104
1105 #[cfg(not(target_os = "windows"))]
1106 {
1107 std::env::var("SHELL").unwrap_or("/bin/sh".to_string())
1108 }
1109}
1110
1111#[derive(Debug)]
1112pub enum ConnectionResult<O> {
1113 Timeout,
1114 ConnectionReset,
1115 Result(anyhow::Result<O>),
1116}
1117
1118impl<O> ConnectionResult<O> {
1119 pub fn into_response(self) -> anyhow::Result<O> {
1120 match self {
1121 ConnectionResult::Timeout => anyhow::bail!("Request timed out"),
1122 ConnectionResult::ConnectionReset => anyhow::bail!("Server reset the connection"),
1123 ConnectionResult::Result(r) => r,
1124 }
1125 }
1126}
1127
1128impl<O> From<anyhow::Result<O>> for ConnectionResult<O> {
1129 fn from(result: anyhow::Result<O>) -> Self {
1130 ConnectionResult::Result(result)
1131 }
1132}
1133
1134#[cfg(test)]
1135mod tests {
1136 use super::*;
1137
1138 #[test]
1139 fn test_extend_sorted() {
1140 let mut vec = vec![];
1141
1142 extend_sorted(&mut vec, vec![21, 17, 13, 8, 1, 0], 5, |a, b| b.cmp(a));
1143 assert_eq!(vec, &[21, 17, 13, 8, 1]);
1144
1145 extend_sorted(&mut vec, vec![101, 19, 17, 8, 2], 8, |a, b| b.cmp(a));
1146 assert_eq!(vec, &[101, 21, 19, 17, 13, 8, 2, 1]);
1147
1148 extend_sorted(&mut vec, vec![1000, 19, 17, 9, 5], 8, |a, b| b.cmp(a));
1149 assert_eq!(vec, &[1000, 101, 21, 19, 17, 13, 9, 8]);
1150 }
1151
1152 #[test]
1153 fn test_truncate_to_bottom_n_sorted_by() {
1154 let mut vec: Vec<u32> = vec![5, 2, 3, 4, 1];
1155 truncate_to_bottom_n_sorted_by(&mut vec, 10, &u32::cmp);
1156 assert_eq!(vec, &[1, 2, 3, 4, 5]);
1157
1158 vec = vec![5, 2, 3, 4, 1];
1159 truncate_to_bottom_n_sorted_by(&mut vec, 5, &u32::cmp);
1160 assert_eq!(vec, &[1, 2, 3, 4, 5]);
1161
1162 vec = vec![5, 2, 3, 4, 1];
1163 truncate_to_bottom_n_sorted_by(&mut vec, 4, &u32::cmp);
1164 assert_eq!(vec, &[1, 2, 3, 4]);
1165
1166 vec = vec![5, 2, 3, 4, 1];
1167 truncate_to_bottom_n_sorted_by(&mut vec, 1, &u32::cmp);
1168 assert_eq!(vec, &[1]);
1169
1170 vec = vec![5, 2, 3, 4, 1];
1171 truncate_to_bottom_n_sorted_by(&mut vec, 0, &u32::cmp);
1172 assert!(vec.is_empty());
1173 }
1174
1175 #[test]
1176 fn test_iife() {
1177 fn option_returning_function() -> Option<()> {
1178 None
1179 }
1180
1181 let foo = maybe!({
1182 option_returning_function()?;
1183 Some(())
1184 });
1185
1186 assert_eq!(foo, None);
1187 }
1188
1189 #[test]
1190 fn test_truncate_and_trailoff() {
1191 assert_eq!(truncate_and_trailoff("", 5), "");
1192 assert_eq!(truncate_and_trailoff("aaaaaa", 7), "aaaaaa");
1193 assert_eq!(truncate_and_trailoff("aaaaaa", 6), "aaaaaa");
1194 assert_eq!(truncate_and_trailoff("aaaaaa", 5), "aaaaaβ¦");
1195 assert_eq!(truncate_and_trailoff("èèèèèè", 7), "èèèèèè");
1196 assert_eq!(truncate_and_trailoff("èèèèèè", 6), "èèèèèè");
1197 assert_eq!(truncate_and_trailoff("èèèèèè", 5), "èèèèèβ¦");
1198 }
1199
1200 #[test]
1201 fn test_truncate_and_remove_front() {
1202 assert_eq!(truncate_and_remove_front("", 5), "");
1203 assert_eq!(truncate_and_remove_front("aaaaaa", 7), "aaaaaa");
1204 assert_eq!(truncate_and_remove_front("aaaaaa", 6), "aaaaaa");
1205 assert_eq!(truncate_and_remove_front("aaaaaa", 5), "β¦aaaaa");
1206 assert_eq!(truncate_and_remove_front("èèèèèè", 7), "èèèèèè");
1207 assert_eq!(truncate_and_remove_front("èèèèèè", 6), "èèèèèè");
1208 assert_eq!(truncate_and_remove_front("èèèèèè", 5), "β¦Γ¨Γ¨Γ¨Γ¨Γ¨");
1209 }
1210
1211 #[test]
1212 fn test_numeric_prefix_str_method() {
1213 let target = "1a";
1214 assert_eq!(
1215 NumericPrefixWithSuffix::from_numeric_prefixed_str(target),
1216 NumericPrefixWithSuffix(Some(1), "a")
1217 );
1218
1219 let target = "12ab";
1220 assert_eq!(
1221 NumericPrefixWithSuffix::from_numeric_prefixed_str(target),
1222 NumericPrefixWithSuffix(Some(12), "ab")
1223 );
1224
1225 let target = "12_ab";
1226 assert_eq!(
1227 NumericPrefixWithSuffix::from_numeric_prefixed_str(target),
1228 NumericPrefixWithSuffix(Some(12), "_ab")
1229 );
1230
1231 let target = "1_2ab";
1232 assert_eq!(
1233 NumericPrefixWithSuffix::from_numeric_prefixed_str(target),
1234 NumericPrefixWithSuffix(Some(1), "_2ab")
1235 );
1236
1237 let target = "1.2";
1238 assert_eq!(
1239 NumericPrefixWithSuffix::from_numeric_prefixed_str(target),
1240 NumericPrefixWithSuffix(Some(1), ".2")
1241 );
1242
1243 let target = "1.2_a";
1244 assert_eq!(
1245 NumericPrefixWithSuffix::from_numeric_prefixed_str(target),
1246 NumericPrefixWithSuffix(Some(1), ".2_a")
1247 );
1248
1249 let target = "12.2_a";
1250 assert_eq!(
1251 NumericPrefixWithSuffix::from_numeric_prefixed_str(target),
1252 NumericPrefixWithSuffix(Some(12), ".2_a")
1253 );
1254
1255 let target = "12a.2_a";
1256 assert_eq!(
1257 NumericPrefixWithSuffix::from_numeric_prefixed_str(target),
1258 NumericPrefixWithSuffix(Some(12), "a.2_a")
1259 );
1260 }
1261
1262 #[test]
1263 fn test_numeric_prefix_with_suffix() {
1264 let mut sorted = vec!["1-abc", "10", "11def", "2", "21-abc"];
1265 sorted.sort_by_key(|s| NumericPrefixWithSuffix::from_numeric_prefixed_str(s));
1266 assert_eq!(sorted, ["1-abc", "2", "10", "11def", "21-abc"]);
1267
1268 for numeric_prefix_less in ["numeric_prefix_less", "aaa", "~β’Β£"] {
1269 assert_eq!(
1270 NumericPrefixWithSuffix::from_numeric_prefixed_str(numeric_prefix_less),
1271 NumericPrefixWithSuffix(None, numeric_prefix_less),
1272 "String without numeric prefix `{numeric_prefix_less}` should not be converted into NumericPrefixWithSuffix"
1273 )
1274 }
1275 }
1276
1277 #[test]
1278 fn test_word_consists_of_emojis() {
1279 let words_to_test = vec![
1280 ("π¨βπ©βπ§βπ§ππ₯", true),
1281 ("π", true),
1282 ("!π", false),
1283 ("π!", false),
1284 ("π ", false),
1285 (" π", false),
1286 ("Test", false),
1287 ];
1288
1289 for (text, expected_result) in words_to_test {
1290 assert_eq!(word_consists_of_emojis(text), expected_result);
1291 }
1292 }
1293
1294 #[test]
1295 fn test_truncate_lines_and_trailoff() {
1296 let text = r#"Line 1
1297Line 2
1298Line 3"#;
1299
1300 assert_eq!(
1301 truncate_lines_and_trailoff(text, 2),
1302 r#"Line 1
1303β¦"#
1304 );
1305
1306 assert_eq!(
1307 truncate_lines_and_trailoff(text, 3),
1308 r#"Line 1
1309Line 2
1310β¦"#
1311 );
1312
1313 assert_eq!(
1314 truncate_lines_and_trailoff(text, 4),
1315 r#"Line 1
1316Line 2
1317Line 3"#
1318 );
1319 }
1320
1321 #[test]
1322 fn test_expanded_and_wrapped_usize_range() {
1323 // Neither wrap
1324 assert_eq!(
1325 expanded_and_wrapped_usize_range(2..4, 1, 1, 8).collect::<Vec<usize>>(),
1326 (1..5).collect::<Vec<usize>>()
1327 );
1328 // Start wraps
1329 assert_eq!(
1330 expanded_and_wrapped_usize_range(2..4, 3, 1, 8).collect::<Vec<usize>>(),
1331 ((0..5).chain(7..8)).collect::<Vec<usize>>()
1332 );
1333 // Start wraps all the way around
1334 assert_eq!(
1335 expanded_and_wrapped_usize_range(2..4, 5, 1, 8).collect::<Vec<usize>>(),
1336 (0..8).collect::<Vec<usize>>()
1337 );
1338 // Start wraps all the way around and past 0
1339 assert_eq!(
1340 expanded_and_wrapped_usize_range(2..4, 10, 1, 8).collect::<Vec<usize>>(),
1341 (0..8).collect::<Vec<usize>>()
1342 );
1343 // End wraps
1344 assert_eq!(
1345 expanded_and_wrapped_usize_range(3..5, 1, 4, 8).collect::<Vec<usize>>(),
1346 (0..1).chain(2..8).collect::<Vec<usize>>()
1347 );
1348 // End wraps all the way around
1349 assert_eq!(
1350 expanded_and_wrapped_usize_range(3..5, 1, 5, 8).collect::<Vec<usize>>(),
1351 (0..8).collect::<Vec<usize>>()
1352 );
1353 // End wraps all the way around and past the end
1354 assert_eq!(
1355 expanded_and_wrapped_usize_range(3..5, 1, 10, 8).collect::<Vec<usize>>(),
1356 (0..8).collect::<Vec<usize>>()
1357 );
1358 // Both start and end wrap
1359 assert_eq!(
1360 expanded_and_wrapped_usize_range(3..5, 4, 4, 8).collect::<Vec<usize>>(),
1361 (0..8).collect::<Vec<usize>>()
1362 );
1363 }
1364
1365 #[test]
1366 fn test_wrapped_usize_outward_from() {
1367 // No wrapping
1368 assert_eq!(
1369 wrapped_usize_outward_from(4, 2, 2, 10).collect::<Vec<usize>>(),
1370 vec![4, 5, 3, 6, 2]
1371 );
1372 // Wrapping at end
1373 assert_eq!(
1374 wrapped_usize_outward_from(8, 2, 3, 10).collect::<Vec<usize>>(),
1375 vec![8, 9, 7, 0, 6, 1]
1376 );
1377 // Wrapping at start
1378 assert_eq!(
1379 wrapped_usize_outward_from(1, 3, 2, 10).collect::<Vec<usize>>(),
1380 vec![1, 2, 0, 3, 9, 8]
1381 );
1382 // All values wrap around
1383 assert_eq!(
1384 wrapped_usize_outward_from(5, 10, 10, 8).collect::<Vec<usize>>(),
1385 vec![5, 6, 4, 7, 3, 0, 2, 1]
1386 );
1387 // None before / after
1388 assert_eq!(
1389 wrapped_usize_outward_from(3, 0, 0, 8).collect::<Vec<usize>>(),
1390 vec![3]
1391 );
1392 // Starting point already wrapped
1393 assert_eq!(
1394 wrapped_usize_outward_from(15, 2, 2, 10).collect::<Vec<usize>>(),
1395 vec![5, 6, 4, 7, 3]
1396 );
1397 // wrap_length of 0
1398 assert_eq!(
1399 wrapped_usize_outward_from(4, 2, 2, 0).collect::<Vec<usize>>(),
1400 Vec::<usize>::new()
1401 );
1402 }
1403
1404 #[test]
1405 fn test_split_with_ranges() {
1406 let input = "hi";
1407 let result = split_str_with_ranges(input, |c| c == ' ');
1408
1409 assert_eq!(result.len(), 1);
1410 assert_eq!(result[0], (0..2, "hi"));
1411
1412 let input = "hΓ©lloπ¦world";
1413 let result = split_str_with_ranges(input, |c| c == 'π¦');
1414
1415 assert_eq!(result.len(), 2);
1416 assert_eq!(result[0], (0..6, "hΓ©llo")); // 'Γ©' is 2 bytes
1417 assert_eq!(result[1], (10..15, "world")); // 'π¦' is 4 bytes
1418 }
1419}