Allow a language override to include multiple globs

src/main.rs

@@ -154,7 +154,7 @@ fn main() {
             use_color,
             language_overrides,
         } => {
-            for (glob, lang_override) in language_overrides {
+            for (lang_override, globs) in language_overrides {
                 let mut name = match lang_override {
                     LanguageOverride::Language(lang) => language_name(lang),
                     LanguageOverride::PlainText => "Text",
@@ -164,7 +164,10 @@ fn main() {
                     name = name.bold().to_string();
                 }
                 println!("{} (from override)", name);
-                println!(" {}", glob.as_str());
+                for glob in globs {
+                    print!(" {}", glob.as_str());
+                }
+                println!();
             }
 
             for language in Language::iter() {
@@ -328,7 +331,7 @@ fn diff_file(
     display_options: &DisplayOptions,
     diff_options: &DiffOptions,
     missing_as_empty: bool,
-    overrides: &[(glob::Pattern, LanguageOverride)],
+    overrides: &[(LanguageOverride, Vec<glob::Pattern>)],
 ) -> DiffResult {
     let (lhs_bytes, rhs_bytes) = read_files_or_die(lhs_path, rhs_path, missing_as_empty);
     let (lhs_src, rhs_src) = match (guess_content(&lhs_bytes), guess_content(&rhs_bytes)) {
@@ -367,7 +370,7 @@ fn diff_conflicts_file(
     path: &FileArgument,
     display_options: &DisplayOptions,
     diff_options: &DiffOptions,
-    overrides: &[(glob::Pattern, LanguageOverride)],
+    overrides: &[(LanguageOverride, Vec<glob::Pattern>)],
 ) -> DiffResult {
     let bytes = read_file_or_die(path);
     let src = match guess_content(&bytes) {
@@ -452,7 +455,7 @@ fn diff_file_content(
     rhs_src: &str,
     display_options: &DisplayOptions,
     diff_options: &DiffOptions,
-    overrides: &[(glob::Pattern, LanguageOverride)],
+    overrides: &[(LanguageOverride, Vec<glob::Pattern>)],
 ) -> DiffResult {
     let (guess_src, guess_path) = match rhs_path {
         FileArgument::NamedPath(path) => (&rhs_src, Path::new(path)),
@@ -686,7 +689,7 @@ fn diff_directories<'a>(
     rhs_dir: &'a Path,
     display_options: &DisplayOptions,
     diff_options: &DiffOptions,
-    overrides: &[(glob::Pattern, LanguageOverride)],
+    overrides: &[(LanguageOverride, Vec<glob::Pattern>)],
 ) -> impl ParallelIterator<Item = DiffResult> + 'a {
     let diff_options = diff_options.clone();
     let display_options = display_options.clone();

src/options.rs

@@ -353,7 +353,7 @@ pub enum Mode {
         diff_options: DiffOptions,
         display_options: DisplayOptions,
         set_exit_code: bool,
-        language_overrides: Vec<(glob::Pattern, LanguageOverride)>,
+        language_overrides: Vec<(LanguageOverride, Vec<glob::Pattern>)>,
         /// The path where we can read the LHS file. This is often a
         /// temporary file generated by source control.
         lhs_path: FileArgument,
@@ -369,23 +369,23 @@ pub enum Mode {
         diff_options: DiffOptions,
         display_options: DisplayOptions,
         set_exit_code: bool,
-        language_overrides: Vec<(glob::Pattern, LanguageOverride)>,
+        language_overrides: Vec<(LanguageOverride, Vec<glob::Pattern>)>,
         path: FileArgument,
         /// The path that we show to the user.
         display_path: String,
     },
     ListLanguages {
         use_color: bool,
-        language_overrides: Vec<(glob::Pattern, LanguageOverride)>,
+        language_overrides: Vec<(LanguageOverride, Vec<glob::Pattern>)>,
     },
     DumpTreeSitter {
         path: String,
-        language_overrides: Vec<(glob::Pattern, LanguageOverride)>,
+        language_overrides: Vec<(LanguageOverride, Vec<glob::Pattern>)>,
     },
     DumpSyntax {
         path: String,
         ignore_comments: bool,
-        language_overrides: Vec<(glob::Pattern, LanguageOverride)>,
+        language_overrides: Vec<(LanguageOverride, Vec<glob::Pattern>)>,
     },
 }
 
@@ -434,8 +434,8 @@ fn build_display_path(lhs_path: &FileArgument, rhs_path: &FileArgument) -> Strin
     }
 }
 
-fn parse_overrides_or_die(raw_overrides: &[String]) -> Vec<(glob::Pattern, LanguageOverride)> {
-    let mut res = vec![];
+fn parse_overrides_or_die(raw_overrides: &[String]) -> Vec<(LanguageOverride, Vec<glob::Pattern>)> {
+    let mut res: Vec<(LanguageOverride, Vec<glob::Pattern>)> = vec![];
     let mut invalid_syntax = false;
 
     for raw_override in raw_overrides {
@@ -443,7 +443,7 @@ fn parse_overrides_or_die(raw_overrides: &[String]) -> Vec<(glob::Pattern, Langu
             match glob::Pattern::new(glob_str) {
                 Ok(pattern) => {
                     if let Some(language_override) = language_override_from_name(lang_name) {
-                        res.push((pattern, language_override));
+                        res.push((language_override, vec![pattern]));
                     } else {
                         eprintln!("No such language '{}'", lang_name);
                         eprintln!("See --list-languages for the names of all languages available. Language overrides are case insensitive.");

src/parse/guess_language.rs

@@ -365,11 +365,12 @@ fn looks_like_hacklang(path: &Path, src: &str) -> bool {
 pub fn guess(
     path: &Path,
     src: &str,
-    overrides: &[(glob::Pattern, LanguageOverride)],
+    overrides: &[(LanguageOverride, Vec<glob::Pattern>)],
 ) -> Option<Language> {
     if let Some(file_name) = path.file_name() {
         let file_name = file_name.to_string_lossy();
-        for (pattern, lang_override) in overrides {
+        for (lang_override, patterns) in overrides {
+            for pattern in patterns {
                 if pattern.matches(&file_name) {
                     match lang_override {
                         LanguageOverride::Language(lang) => return Some(*lang),
@@ -380,6 +381,7 @@ pub fn guess(
                 }
             }
         }
+    }
 
     if let Some(lang) = from_emacs_mode_header(src) {
         return Some(lang);
@@ -596,8 +598,8 @@ mod tests {
                 path,
                 "",
                 &[(
-                    glob::Pattern::new("*.el").unwrap(),
-                    LanguageOverride::Language(Css)
+                    LanguageOverride::Language(Css),
+                    vec![glob::Pattern::new("*.el").unwrap()],
                 )]
             ),
             Some(Css)