@@ -0,0 +1,769 @@
+use collections::HashSet;
+use rand::Rng;
+
+/// Names of historical typewriter brands, for use in auto-generated branch names.
+/// (Hyphens and parens have been dropped so that the branch names are one-word.)
+///
+/// Thanks to https://typewriterdatabase.com/alph.0.brands for the names!
+const TYPEWRITER_NAMES: &[&str] = &[
+ "abeille",
+ "acme",
+ "addo",
+ "adler",
+ "adlerette",
+ "adlerita",
+ "admiral",
+ "agamli",
+ "agar",
+ "agidel",
+ "agil",
+ "aguia",
+ "aguila",
+ "aigle",
+ "ahram",
+ "ajax",
+ "aktiv",
+ "ala",
+ "alba",
+ "albus",
+ "alexander",
+ "alexis",
+ "alfa",
+ "allen",
+ "alonso",
+ "alpina",
+ "amata",
+ "amaya",
+ "amka",
+ "anavi",
+ "anderson",
+ "andina",
+ "antares",
+ "apex",
+ "apsco",
+ "aquila",
+ "archo",
+ "ardita",
+ "argyle",
+ "aristocrat",
+ "aristokrat",
+ "arlington",
+ "armstrong",
+ "arpha",
+ "artus",
+ "astoria",
+ "atlantia",
+ "atlantic",
+ "atlas",
+ "augusta",
+ "aurora",
+ "austro",
+ "automatic",
+ "avanti",
+ "avona",
+ "azzurra",
+ "bajnok",
+ "baldwin",
+ "balkan",
+ "baltica",
+ "baltimore",
+ "barlock",
+ "barr",
+ "barrat",
+ "bartholomew",
+ "bashkiriya",
+ "bavaria",
+ "beaucourt",
+ "beko",
+ "belka",
+ "bennett",
+ "bennington",
+ "berni",
+ "bianca",
+ "bijou",
+ "bing",
+ "bisei",
+ "biser",
+ "bluebird",
+ "bolida",
+ "borgo",
+ "boston",
+ "boyce",
+ "bradford",
+ "brandenburg",
+ "brigitte",
+ "briton",
+ "brooks",
+ "brosette",
+ "buddy",
+ "burns",
+ "burroughs",
+ "byron",
+ "calanda",
+ "caligraph",
+ "cappel",
+ "cardinal",
+ "carissima",
+ "carlem",
+ "carlton",
+ "carmen",
+ "cawena",
+ "cella",
+ "celtic",
+ "century",
+ "champignon",
+ "cherryland",
+ "chevron",
+ "chicago",
+ "cicero",
+ "cifra",
+ "citizen",
+ "claudia",
+ "cleveland",
+ "clover",
+ "coffman",
+ "cole",
+ "columbia",
+ "commercial",
+ "companion",
+ "concentra",
+ "concord",
+ "concordia",
+ "conover",
+ "constanta",
+ "consul",
+ "conta",
+ "contenta",
+ "contimat",
+ "contina",
+ "continento",
+ "cornelia",
+ "coronado",
+ "cosmopolita",
+ "courier",
+ "craftamatic",
+ "crandall",
+ "crown",
+ "culema",
+ "dactyle",
+ "dankers",
+ "dart",
+ "daugherty",
+ "davis",
+ "dayton",
+ "depantio",
+ "dea",
+ "delmar",
+ "densmore",
+ "diadema",
+ "dial",
+ "diamant",
+ "diana",
+ "dictatype",
+ "diplomat",
+ "diskret",
+ "dolfus",
+ "dollar",
+ "domus",
+ "drake",
+ "draper",
+ "duplex",
+ "durabel",
+ "dynacord",
+ "eagle",
+ "eclipse",
+ "edelmann",
+ "edelweiss",
+ "edison",
+ "edita",
+ "edland",
+ "efka",
+ "eldorado",
+ "electa",
+ "electromatic",
+ "elektro",
+ "elgin",
+ "elliot",
+ "emerson",
+ "emka",
+ "emona",
+ "empire",
+ "engadine",
+ "engler",
+ "erfurt",
+ "erika",
+ "esko",
+ "essex",
+ "eureka",
+ "europa",
+ "everest",
+ "everlux",
+ "excelsior",
+ "express",
+ "fabers",
+ "facit",
+ "fairbanks",
+ "faktotum",
+ "famos",
+ "federal",
+ "felio",
+ "fidat",
+ "filius",
+ "fips",
+ "fish",
+ "fitch",
+ "fleet",
+ "florida",
+ "flott",
+ "flyer",
+ "flying",
+ "fontana",
+ "ford",
+ "forto",
+ "fortuna",
+ "fox",
+ "framo",
+ "franconia",
+ "franklin",
+ "friden",
+ "frolio",
+ "furstenberg",
+ "galesburg",
+ "galiette",
+ "gallia",
+ "garbell",
+ "gardner",
+ "geka",
+ "generation",
+ "genia",
+ "geniatus",
+ "gerda",
+ "gisela",
+ "glashutte",
+ "gloria",
+ "godrej",
+ "gossen",
+ "gourland",
+ "grandjean",
+ "granta",
+ "granville",
+ "graphic",
+ "gritzner",
+ "groma",
+ "guhl",
+ "guidonia",
+ "gundka",
+ "hacabo",
+ "haddad",
+ "halberg",
+ "halda",
+ "hall",
+ "hammond",
+ "hammonia",
+ "harmony",
+ "hanford",
+ "hansa",
+ "harris",
+ "hartford",
+ "hassia",
+ "hatch",
+ "heady",
+ "hebronia",
+ "hebros",
+ "hega",
+ "helios",
+ "helma",
+ "herald",
+ "hercules",
+ "hermes",
+ "herold",
+ "heros",
+ "hesperia",
+ "hogar",
+ "hooven",
+ "hopkins",
+ "horton",
+ "hugin",
+ "hungaria",
+ "hurtu",
+ "iberia",
+ "idea",
+ "ideal",
+ "imperia",
+ "impo",
+ "industria",
+ "industrio",
+ "ingersoll",
+ "international",
+ "invicta",
+ "irene",
+ "iris",
+ "iskra",
+ "ivitsa",
+ "ivriah",
+ "jackson",
+ "janalif",
+ "janos",
+ "jolux",
+ "juki",
+ "junior",
+ "juventa",
+ "juwel",
+ "kamkap",
+ "kamo",
+ "kanzler",
+ "kappel",
+ "karli",
+ "karstadt",
+ "keaton",
+ "kenbar",
+ "keystone",
+ "kim",
+ "klein",
+ "kneist",
+ "knoch",
+ "koh",
+ "kolibri",
+ "kolumbus",
+ "komet",
+ "kondor",
+ "koniger",
+ "konryu",
+ "kontor",
+ "kosmopolit",
+ "krypton",
+ "lambert",
+ "lasalle",
+ "lectra",
+ "leframa",
+ "lemair",
+ "lemco",
+ "liberty",
+ "libia",
+ "liga",
+ "lignose",
+ "lilliput",
+ "lindeteves",
+ "linowriter",
+ "listvitsa",
+ "ludolf",
+ "lutece",
+ "luxa",
+ "lyubava",
+ "mafra",
+ "magnavox",
+ "maher",
+ "majestic",
+ "majitouch",
+ "manhattan",
+ "mapuua",
+ "marathon",
+ "marburger",
+ "maritsa",
+ "maruzen",
+ "maskelyne",
+ "masspro",
+ "matous",
+ "mccall",
+ "mccool",
+ "mcloughlin",
+ "mead",
+ "mechno",
+ "mehano",
+ "meiselbach",
+ "melbi",
+ "melior",
+ "melotyp",
+ "mentor",
+ "mepas",
+ "mercedesia",
+ "mercurius",
+ "mercury",
+ "merkur",
+ "merritt",
+ "merz",
+ "messa",
+ "meteco",
+ "meteor",
+ "micron",
+ "mignon",
+ "mikro",
+ "minerva",
+ "mirian",
+ "mirina",
+ "mitex",
+ "molle",
+ "monac",
+ "monarch",
+ "mondiale",
+ "monica",
+ "monofix",
+ "monopol",
+ "monpti",
+ "monta",
+ "montana",
+ "montgomery",
+ "moon",
+ "morgan",
+ "morris",
+ "morse",
+ "moya",
+ "moyer",
+ "munson",
+ "musicwriter",
+ "nadex",
+ "nakajima",
+ "neckermann",
+ "neubert",
+ "neya",
+ "ninety",
+ "nisa",
+ "noiseless",
+ "noor",
+ "nora",
+ "nord",
+ "norden",
+ "norica",
+ "norma",
+ "norman",
+ "north",
+ "nototyp",
+ "nova",
+ "novalevi",
+ "odell",
+ "odhner",
+ "odo",
+ "odoma",
+ "ohio",
+ "ohtani",
+ "oliva",
+ "oliver",
+ "olivetti",
+ "olympia",
+ "omega",
+ "optima",
+ "orbis",
+ "orel",
+ "orga",
+ "oriette",
+ "orion",
+ "orn",
+ "orplid",
+ "pacior",
+ "pagina",
+ "parisienne",
+ "passat",
+ "pearl",
+ "peerless",
+ "perfect",
+ "perfecta",
+ "perkeo",
+ "perkins",
+ "perlita",
+ "pettypet",
+ "phoenix",
+ "piccola",
+ "picht",
+ "pinnock",
+ "pionier",
+ "plurotyp",
+ "plutarch",
+ "pneumatic",
+ "pocket",
+ "polyglott",
+ "polygraph",
+ "pontiac",
+ "portable",
+ "portex",
+ "pozzi",
+ "premier",
+ "presto",
+ "primavera",
+ "progress",
+ "protos",
+ "pterotype",
+ "pullman",
+ "pulsatta",
+ "quick",
+ "racer",
+ "rand",
+ "radio",
+ "rally",
+ "readers",
+ "reed",
+ "referent",
+ "reff",
+ "regent",
+ "regia",
+ "regina",
+ "rekord",
+ "reliable",
+ "reliance",
+ "remsho",
+ "remagg",
+ "rembrandt",
+ "remer",
+ "remington",
+ "remstar",
+ "remtor",
+ "reporters",
+ "resko",
+ "rex",
+ "rexpel",
+ "rheinita",
+ "rheinmetall",
+ "rival",
+ "roberts",
+ "robotron",
+ "rocher",
+ "rochester",
+ "roebuck",
+ "rofa",
+ "roland",
+ "rooy",
+ "rover",
+ "roxy",
+ "roy",
+ "royal",
+ "rundstatler",
+ "sabaudia",
+ "sabb",
+ "saleem",
+ "salter",
+ "sampo",
+ "sarafan",
+ "saturn",
+ "saxonia",
+ "schade",
+ "schapiro",
+ "schreibi",
+ "scripta",
+ "sears",
+ "secor",
+ "selectric",
+ "selekta",
+ "senator",
+ "sense",
+ "senta",
+ "serd",
+ "shilling",
+ "shimade",
+ "shimer",
+ "sholes",
+ "shuang",
+ "siegfried",
+ "siemag",
+ "silma",
+ "silver",
+ "simplex",
+ "simtype",
+ "singer",
+ "smith",
+ "soemtron",
+ "sonja",
+ "speedwriter",
+ "sphinx",
+ "starlet",
+ "stearns",
+ "steel",
+ "stella",
+ "steno",
+ "sterling",
+ "stoewer",
+ "stolzenberg",
+ "stott",
+ "strangfeld",
+ "sture",
+ "stylotyp",
+ "sun",
+ "superba",
+ "superia",
+ "supermetall",
+ "surety",
+ "swintec",
+ "swissa",
+ "talbos",
+ "talleres",
+ "tatrapoint",
+ "taurus",
+ "taylorix",
+ "tell",
+ "tempotype",
+ "society",
+ "tippco",
+ "titania",
+ "tops",
+ "towa",
+ "toyo",
+ "tradition",
+ "transatlantic",
+ "traveller",
+ "trebla",
+ "triumph",
+ "turia",
+ "typatune",
+ "typen",
+ "typorium",
+ "ugro",
+ "ultima",
+ "unda",
+ "underwood",
+ "unica",
+ "unitype",
+ "ursula",
+ "utax",
+ "varityper",
+ "vasanta",
+ "vendex",
+ "venus",
+ "victor",
+ "victoria",
+ "video",
+ "viking",
+ "vira",
+ "virotyp",
+ "visigraph",
+ "vittoria",
+ "volcan",
+ "vornado",
+ "voss",
+ "vultur",
+ "waltons",
+ "wanamaker",
+ "wanderer",
+ "ward",
+ "warner",
+ "waterloo",
+ "waverley",
+ "wayne",
+ "webster",
+ "wedgefield",
+ "welco",
+ "wellington",
+ "wellon",
+ "weltblick",
+ "westphalia",
+ "wiedmer",
+ "williams",
+ "wilson",
+ "winkel",
+ "winsor",
+ "wizard",
+ "woodstock",
+ "woodwards",
+ "yatran",
+ "yost",
+ "zenit",
+ "zentronik",
+ "zeta",
+ "zeya",
+];
+
+/// Picks a typewriter name that isn't already taken by an existing branch.
+///
+/// Each entry in `existing_branches` is expected to be a full branch name
+/// like `"olivetti-a3f9b2c1"`. The prefix before the last `'-'` is treated
+/// as the taken typewriter name. Branches without a `'-'` are ignored.
+///
+/// Returns `None` when every name in the pool is already taken.
+pub fn pick_typewriter_name(
+ existing_branches: &[&str],
+ rng: &mut impl Rng,
+) -> Option<&'static str> {
+ let disallowed: HashSet<&str> = existing_branches
+ .iter()
+ .filter_map(|branch| branch.rsplit_once('-').map(|(prefix, _)| prefix))
+ .collect();
+
+ let available: Vec<&'static str> = TYPEWRITER_NAMES
+ .iter()
+ .copied()
+ .filter(|name| !disallowed.contains(name))
+ .collect();
+
+ if available.is_empty() {
+ return None;
+ }
+
+ let index = rng.random_range(0..available.len());
+ Some(available[index])
+}
+
+/// Generates a branch name like `"olivetti-a3f9b2c1"` by picking a typewriter
+/// name that isn't already taken and appending an 8-character alphanumeric hash.
+///
+/// Returns `None` when every typewriter name in the pool is already taken.
+pub fn generate_branch_name(existing_branches: &[&str], rng: &mut impl Rng) -> Option<String> {
+ let typewriter_name = pick_typewriter_name(existing_branches, rng)?;
+ let hash: String = (0..8)
+ .map(|_| {
+ let idx: u8 = rng.random_range(0..36);
+ if idx < 10 {
+ (b'0' + idx) as char
+ } else {
+ (b'a' + idx - 10) as char
+ }
+ })
+ .collect();
+ Some(format!("{typewriter_name}-{hash}"))
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use rand::rngs::StdRng;
+
+ #[gpui::test(iterations = 10)]
+ fn test_pick_typewriter_name_with_no_disallowed(mut rng: StdRng) {
+ let name = pick_typewriter_name(&[], &mut rng);
+ assert!(name.is_some());
+ assert!(TYPEWRITER_NAMES.contains(&name.unwrap()));
+ }
+
+ #[gpui::test(iterations = 10)]
+ fn test_pick_typewriter_name_excludes_taken_names(mut rng: StdRng) {
+ let branch_names = &["olivetti-abc12345", "selectric-def67890"];
+ let name = pick_typewriter_name(branch_names, &mut rng).unwrap();
+ assert_ne!(name, "olivetti");
+ assert_ne!(name, "selectric");
+ }
+
+ #[gpui::test]
+ fn test_pick_typewriter_name_all_taken(mut rng: StdRng) {
+ let branch_names: Vec<String> = TYPEWRITER_NAMES
+ .iter()
+ .map(|name| format!("{name}-00000000"))
+ .collect();
+ let branch_name_refs: Vec<&str> = branch_names.iter().map(|s| s.as_str()).collect();
+ let name = pick_typewriter_name(&branch_name_refs, &mut rng);
+ assert!(name.is_none());
+ }
+
+ #[gpui::test(iterations = 10)]
+ fn test_pick_typewriter_name_ignores_branches_without_hyphen(mut rng: StdRng) {
+ let branch_names = &["main", "develop", "feature"];
+ let name = pick_typewriter_name(branch_names, &mut rng);
+ assert!(name.is_some());
+ assert!(TYPEWRITER_NAMES.contains(&name.unwrap()));
+ }
+
+ #[gpui::test(iterations = 10)]
+ fn test_generate_branch_name_format(mut rng: StdRng) {
+ let branch_name = generate_branch_name(&[], &mut rng).unwrap();
+ let (prefix, suffix) = branch_name.rsplit_once('-').unwrap();
+ assert!(TYPEWRITER_NAMES.contains(&prefix));
+ assert_eq!(suffix.len(), 8);
+ assert!(suffix.chars().all(|c| c.is_ascii_alphanumeric()));
+ }
+
+ #[gpui::test]
+ fn test_generate_branch_name_returns_none_when_exhausted(mut rng: StdRng) {
+ let branch_names: Vec<String> = TYPEWRITER_NAMES
+ .iter()
+ .map(|name| format!("{name}-00000000"))
+ .collect();
+ let branch_name_refs: Vec<&str> = branch_names.iter().map(|s| s.as_str()).collect();
+ let result = generate_branch_name(&branch_name_refs, &mut rng);
+ assert!(result.is_none());
+ }
+}