Add highlighting for git_commit (#7147)

https://github.com/zed-industries/zed/assets/45585937/32cf5622-e960-4775-986d-bcfd30c81098

Release Notes:

- Added highlighting for git_commit

crates/zed/Cargo.toml

@@ -112,6 +112,7 @@ tree-sitter-css.workspace = true
 tree-sitter-elixir.workspace = true
 tree-sitter-elm.workspace = true
 tree-sitter-embedded-template.workspace = true
+tree-sitter-gitcommit.workspace = true
 tree-sitter-gleam.workspace = true
 tree-sitter-glsl.workspace = true
 tree-sitter-go.workspace = true

crates/zed/src/languages.rs

@@ -112,7 +112,7 @@ pub fn init(
             })],
         ),
     }
-
+    language("gitcommit", tree_sitter_gitcommit::language(), vec![]);
     language(
         "gleam",
         tree_sitter_gleam::language(),

crates/zed/src/languages/gitcommit/config.toml

@@ -0,0 +1,11 @@
+name = "Git commit"
+path_suffixes = [
+  # Refer to https://github.com/neovim/neovim/blob/master/runtime/lua/vim/filetype.lua#L1286-L1290
+  "TAG_EDITMSG",
+  "MERGE_MSG",
+  "COMMIT_EDITMSG",
+  "NOTES_EDITMSG",
+  "EDIT_DESCRIPTION",
+]
+line_comments = ["#"]
+brackets = []

crates/zed/src/languages/gitcommit/highlights.scm

@@ -0,0 +1,34 @@
+(comment) @comment
+(generated_comment) @comment
+(title) @text.title
+(text) @text
+(branch) @text.reference
+(change) @keyword
+(filepath) @text.uri
+(arrow) @punctuation.delimiter
+
+(subject) @text.title
+(subject (overflow) @text)
+(prefix (type) @keyword)
+(prefix (scope) @parameter)
+(prefix [
+    "("
+    ")"
+    ":"
+] @punctuation.delimiter)
+(prefix [
+    "!"
+] @punctuation.special)
+
+(message) @text
+
+(trailer (token) @keyword)
+(trailer (value) @text)
+
+(breaking_change (token) @text.warning)
+(breaking_change (value) @text)
+
+(scissor) @comment
+(subject_prefix) @keyword
+
+(ERROR) @error

crates/zed/src/languages/gitcommit/injections.scm

@@ -0,0 +1,8 @@
+((diff) @injection.content
+ (#set! injection.combined)
+ (#set! injection.language "diff"))
+
+((rebase_command) @injection.content
+ (#set! injection.combined)
+ (#set! injection.language "git_rebase"))
+