From 1653dfaef03d48a8a3aacfdea33ec6d82cab2a06 Mon Sep 17 00:00:00 2001
From: Albert Cervin <albert@acervin.com>
Date: Thu, 1 Feb 2024 00:08:06 +0100
Subject: Add git commit syntax

---
 dged.nix          | 11 +++++++++++
 src/dged/lang.c   |  3 ++-
 src/dged/syntax.c | 21 +++++++++++++++++++--
 src/main/main.c   |  4 ++--
 4 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/dged.nix b/dged.nix
index 84eb6ae..87a0a00 100644
--- a/dged.nix
+++ b/dged.nix
@@ -9,6 +9,7 @@
 , doxygen
 , valgrind
 , linkFarm
+, fetchFromGitHub
 }:
 stdenv.mkDerivation {
   name = "dged";
@@ -38,6 +39,16 @@ stdenv.mkDerivation {
       "nix" = tree-sitter-nix;
       "python" = tree-sitter-python;
       "make" = tree-sitter-make;
+      "gitcommit" = tree-sitter.buildGrammar {
+        language = "gitcommit";
+        version = "0.3.3";
+        src = fetchFromGitHub {
+          owner = "gbprod";
+          repo = "tree-sitter-gitcommit";
+          rev = "v0.3.3";
+          hash = "sha256-L3v+dQZhwC+kBOHf3YVbZjuCU+idbUDByEdUBmeGAlo=";
+        };
+      };
     };
 
   installPhase = ''
diff --git a/src/dged/lang.c b/src/dged/lang.c
index e392136..562f162 100644
--- a/src/dged/lang.c
+++ b/src/dged/lang.c
@@ -57,6 +57,7 @@ void languages_init(bool register_default) {
     define_lang("Nix", "nix", ".*\\.nix", 4, "rnix-lsp");
     define_lang("Make", "make", ".*(Makefile|\\.mk)", 4, NULL);
     define_lang("Python", "python", ".*\\.py", 4, NULL);
+    define_lang("Git Commit Message", "gitcommit", "COMMIT_EDITMSG", 4, NULL);
   }
 }
 
@@ -215,6 +216,6 @@ struct language lang_from_id(const char *id) {
     return lang_from_settings(id);
   } else {
     minibuffer_echo_timeout(4, "failed to find language \"%s\"", id);
-    return lang_from_settings("languages.fnd");
+    return g_fundamental;
   }
 }
diff --git a/src/dged/syntax.c b/src/dged/syntax.c
index 0935080..1091123 100644
--- a/src/dged/syntax.c
+++ b/src/dged/syntax.c
@@ -17,6 +17,7 @@
 #include "hash.h"
 #include "minibuffer.h"
 #include "path.h"
+#include "settings.h"
 #include "text.h"
 #include "vec.h"
 
@@ -110,8 +111,17 @@ static const char *read_text(void *payload, uint32_t byte_offset,
   return NULL;
 }
 
+static const char *grammar_name_from_buffer(struct buffer *buffer) {
+  struct setting *s = lang_setting(&buffer->lang, "grammar");
+  if (s != NULL && s->value.type == Setting_String) {
+    return s->value.string_value;
+  }
+
+  return buffer->lang.name;
+}
+
 static const char *lang_folder(struct buffer *buffer) {
-  const char *langname = buffer->lang.name;
+  const char *langname = grammar_name_from_buffer(buffer);
 
   size_t tspath_len = strlen(treesitter_path);
   size_t lang_len = strlen(langname);
@@ -328,6 +338,7 @@ static void update_parser(struct buffer *buffer, void *userdata,
       } else if (s8eq(cname, s8("string")) ||
                  s8eq(cname, s8("string.special")) ||
                  s8eq(cname, s8("string.special.path")) ||
+                 s8eq(cname, s8("text.title")) || s8eq(cname, s8("text.uri")) ||
                  s8eq(cname, s8("string.special.uri"))) {
         highlight = true;
         color = Color_Green;
@@ -472,7 +483,7 @@ static void create_parser(struct buffer *buffer, void *userdata) {
     return;
   }
 
-  const char *langname = buffer->lang.name;
+  const char *langname = grammar_name_from_buffer(buffer);
   size_t lang_len = strlen(langname);
 
   const char *prefix = "tree_sitter_";
@@ -547,7 +558,13 @@ void syntax_init() {
     return;
   }
 
+  // TODO: check that it exists
+  struct language l = lang_from_id("gitcommit");
+  lang_setting_set_default(&l, "grammar",
+                           (struct setting_value){.type = Setting_String,
+                                                  .string_value = "gitcommit"});
   buffer_add_create_hook(create_parser, NULL);
+  lang_destroy(&l);
 }
 
 void syntax_teardown() {
diff --git a/src/main/main.c b/src/main/main.c
index c40f438..348ac1e 100644
--- a/src/main/main.c
+++ b/src/main/main.c
@@ -285,8 +285,8 @@ int main(int argc, char *argv[]) {
 
     struct window *active_window = windows_get_active();
 
-    /* Update the screen by flushing command lists collected from updating the
-     * buffers.
+    /* Update the screen by flushing command lists collected
+     * from updating the buffers.
      */
     TIMED_SCOPE_BEGIN(display);
     display_begin_render(display);
-- 
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