feat: Refine magit gptcommit prompt

ext/doom/config.el

@@ -369,9 +369,61 @@
               ("C-c C-g" . magit-gptcommit-commit-accept))
   :init
   (require 'llm-openai)
+
+  ;; Helper function for writing a prompt for Magit GPTCommit
+  (defun join-with-newlines (list)
+    (mapconcat 'identity list "\n"))
+
   :custom
   (llm-warn-on-nonfree nil)
   (magit-gptcommit-llm-provider (make-llm-openai-compatible :key "OPENAI-KEY" :url "http://100.64.0.3:18082/v1/"))
+
+  ;; TODO Test different prompts
+  (magit-gptcommit-prompt
+   (join-with-newlines
+    '(
+      "You are an expert programmer writing a commit message"
+      "You went over every file diff that was changed in it."
+
+      "First Determine the best label for the diffs."
+      "Here are the labels you can choose from:"
+      "- build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)"
+      "- chore: Updating libraries, copyrights or other repo setting, includes updating dependencies."
+      "- ci: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, GitHub Actions)"
+      "- docs: Non-code changes, such as fixing typos or adding new documentation"
+      "- feat: a commit of the type feat introduces a new feature to the codebase"
+      "- fix: A commit of the type fix patches a bug in your codebase"
+      "- perf: A code change that improves performance"
+      "- refactor: A code change that neither fixes a bug nor adds a feature"
+      "- style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)"
+      "- test: Adding missing tests or correcting existing tests"
+      ""
+      "Then summarize the commit into a single specific and cohesive theme."
+      "Remember to write a one line summary, no more than 50 characters."
+      "If it is a simple change no need for additional lines."
+      "If there are multiple unrelated or complicated changes summarize them into bullet points"
+      "Remember to write an empty line between the summary and bullet points."
+      ""
+      "Write your response using the imperative tense following the kernel git commit style guide."
+      "Write a high level title."
+      ""
+      "# Example 1:"
+      "refactor: Rework transaction merging logic"
+      ""
+      "- use functional style instead of nested for loops"
+      "- cache intermediate results"
+      "- use refs instead of cloning everywhere"
+      ""
+      "# Example 2:"
+      "fix: Fix off-by-one integer in loop"
+      "# Example 3:"
+      "style: Add missing semicolon"
+      "THE FILE DIFFS:"
+      "```"
+      "%s"
+      "```"
+      "Now write Commit message in follow template: [label]:[one line of summary] :"
+      )))
   ;; :init
   ;; (setq magit-gptcommit-llm-provider (make-llm-openai-compatible :key "OPENAI-KEY" :url "http://100.64.0.3:8080/v1/"))
   :config