Add Git Commit Code Action with Commit Message Guidelines

This commit adds a new code action for creating Git commit messages that follow
best practices. The code action provides a template with clear guidelines for
the commit message structure, including the subject line and body.

config/code_actions/gitcommit/enhance.lua

@@ -0,0 +1,52 @@
+
+local prompt = [[
+
+Please take the following unstructured draft text, which may contain typos and unclear phrasing,
+and transform it into a clear, concise, and well-structured Git commit message according
+to the following rules:
+
+1. Separate subject from body with a blank line
+2. Limit the subject line to 50 characters
+3. Capitalize the subject line
+4. Do not end the subject line with a period
+5. Use the imperative mood in the subject line
+6. Wrap the body at 72 characters
+7. Use the body to explain what and why vs. how
+
+
+
+---
+]]
+
+local M = {
+  is_triggered = function(selection_range)
+    return true
+  end,
+
+  action_name = function()
+    return "Improve Git Message"
+  end,
+
+  process_answer = function(text, selection_range)
+    return text
+  end,
+
+  create_prompt = function(selection_range)
+    local git_draft_message = active_doc:text_from_range(active_doc:root():range())
+    return table.concat({
+      [[ Human:
+]], prompt, [[
+
+Here is the unstructured draft text:
+
+<task>
+]], git_draft_message, [[</task>
+Assistant: ]] })
+  end,
+
+  placement_range = function(selection_range)
+    return active_doc:root():range()
+  end
+}
+
+return M

src/main.rs

@@ -20,7 +20,7 @@ use tower_lsp::jsonrpc::Result;
 use tower_lsp::lsp_types::*;
 use tower_lsp::{Client, LanguageServer, LspService, Server};
 
-const SUPPORTED_LANGUAGES: [&str; 6] = ["rust", "python", "text", "go", "__all__", "markdown"];
+const SUPPORTED_LANGUAGES: [&str; 7] = ["rust", "python", "text", "go", "__all__", "markdown", "gitcommit"];
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct ResolveActionKind {