forge-llm/README.org

forge-llm

• forge-llm
  • Overview
  • Dependencies
  • Installation
    • Using straight.el with use-package
    • Using MELPA (once available)
    • Manual installation
  • Setting up LLM providers
    • Example: OpenAI provider
    • Example: Anthropic provider
    • Using auth-source for API keys (recommended)
  • Usage
    • Workflow:
    • Canceling Generation:
  • Customization
    • PR Template Configuration
    • LLM Provider Configuration
    • Prompt Configuration
  • Integration with Doom Emacs
  • Troubleshooting
    • Common Issues:
  • Contributing
    • Development Setup
  • Changelog
    • 0.1.0 (Initial Release)
  • License

forge-llm

Generate Pull Request descriptions for Forge using LLM providers through the llm package.

Overview

forge-llm is an Emacs package that integrates Large Language Models (LLMs) with Forge, a Magit interface to GitHub and GitLab forges. This package helps you generate high-quality Pull Request descriptions based on your git diff and repository PR templates.

Main features:

• Automatically finds and uses your repository's PR template
• Generates PR descriptions based on git diffs between branches
• Seamless integration with Forge's PR creation workflow
• Supports any LLM provider supported by the llm package
• Stream LLM responses in real-time

Dependencies

• Magit and Forge
• llm
• Emacs 25.1+

Installation

Using straight.el with use-package

(use-package forge-llm
  :straight (:host gitlab :repo "rogs/forge-llm")
  :after forge
  :config
  (forge-llm-setup))

Using MELPA (once available)

(use-package forge-llm
  :ensure t
  :after forge
  :config
  (forge-llm-setup))

Manual installation

Clone the repository:

git clone https://gitlab.com/rogs/forge-llm.git ~/.emacs.d/site-lisp/forge-llm

Add to your Emacs configuration:

(add-to-list 'load-path "~/.emacs.d/site-lisp/forge-llm")
(require 'forge-llm)
(forge-llm-setup)

Setting up LLM providers

forge-llm depends on the llm package for LLM integration. You'll need to set up at least one LLM provider. Please refer to the llm documentation for detailed instructions.

Example: OpenAI provider

First, create an OpenAI API key. Then configure the llm OpenAI provider:

(require 'llm-openai)
(setq forge-llm-llm-provider (make-llm-openai :key "YOUR-OPENAI-KEY"))

Example: Anthropic provider

To use Claude models from Anthropic:

(require 'llm-claude)
(setq forge-llm-llm-provider (make-llm-claude :key "YOUR-ANTHROPIC-KEY" :chat-model "claude-3-7-sonnet-20250219"))

Using auth-source for API keys (recommended)

For better security, use Emacs auth-source to store your API keys:

(use-package llm
  :ensure t
  :config
  (setq llm-warn-on-nonfree nil))

(require 'llm-openai)

(use-package forge-llm
  :ensure t
  :after (forge llm)
  :custom
  (forge-llm-llm-provider
   (make-llm-openai
    :key (auth-source-pick-first-password
           :host "api.openai.com"
           :user "apikey")))
  :config
  (forge-llm-setup))

Content of .authinfo or .authinfo.gpg:

machine api.openai.com login apikey password YOUR-API-KEY-HERE

Usage

After setting up forge-llm, the following commands will be available in Forge's pull request creation buffer:

Key binding	Command	Description
C-c C-g	forge-llm-generate-pr-description	Generate a PR description (output to separate buffer)
C-c C-p	forge-llm-generate-pr-description-at-point	Generate a PR description at the current point
C-c C-t	forge-llm-insert-template-at-point	Insert the PR template at the current point

Workflow:

1. Create a PR using Forge as normal (forge-create-pullreq)
2. In the PR creation buffer, position your cursor where you want to insert the PR description
3. Press C-c C-p to generate and insert a PR description based on your changes
4. Edit the description as needed and submit the PR

Canceling Generation:

If you need to cancel an in-progress LLM request:

• M-x forge-llm-cancel-request

Customization

You can customize various aspects of forge-llm through the following variables:

PR Template Configuration

• forge-llm-pr-template-paths - List of possible paths for PR/MR templates relative to repo root

  (setq forge-llm-pr-template-paths
        '(".github/PULL_REQUEST_TEMPLATE.md"
          ".github/pull_request_template.md"
          "docs/pull_request_template.md"
          ".gitlab/merge_request_templates/default.md"))

• forge-llm-default-pr-template - Default PR template to use when no template is found in the repository

LLM Provider Configuration

• forge-llm-llm-provider - LLM provider to use. Can be a provider object or a function that returns a provider object

  (setq forge-llm-llm-provider (make-llm-openai :key "YOUR-API-KEY"))

• forge-llm-temperature - Temperature for LLM responses (nil for provider default)

  (setq forge-llm-temperature 0.7)

• forge-llm-max-tokens - Maximum number of tokens for LLM responses (nil for provider default)

  (setq forge-llm-max-tokens 1024)

Prompt Configuration

• forge-llm-pr-description-prompt - Prompt used to generate a PR description with the LLM. This prompt is formatted with the PR template and git diff.

  You can customize this prompt to match your project's PR description style:

  (setq forge-llm-pr-description-prompt
        "Generate a PR description for the following changes.
  PR template:
  %s
  
  Git diff:
  ```
  %s
  ```
  
  Please generate a PR description that follows our team's style.")

Integration with Doom Emacs

Add the following to your packages.el:

(package! forge-llm)

And in your config.el:

(require 'forge-llm)
(require 'llm-openai)
(setq forge-llm-llm-provider (make-llm-openai :key "OPENAI_KEY"))

Or any other LLM available in the llm package.

Troubleshooting

• If you're having issues with the LLM provider, you can enable debug logging for llm by setting llm-log to t.
• Check the *forge-llm-debug-prompt* buffer to see the exact prompt being sent to the LLM.
• Check the *forge-llm-output* buffer to see the raw output from the LLM.

Common Issues:

• Error: "No LLM provider configured"

  • Make sure you've set forge-llm-llm-provider to a valid provider object.
  • Ensure your API key is correct.

• Error: "Failed to generate git diff"

  • Ensure you're in a repository with valid head and base branches.
  • Check if the current directory is within a git repository.

• PR Generation is too slow

  • Consider using a faster model (like GPT-3.5-turbo instead of GPT-4).
  • Reduce forge-llm-max-tokens to limit the response size.

• PR template not found

  • Check if your PR template is in one of the paths listed in forge-llm-pr-template-paths.
  • Add your custom template path if needed.

Contributing

Contributions are welcome! Please feel free to submit a Merge Request.

Development Setup

1. Clone the repository:

   git clone https://gitlab.com/rogs/forge-llm.git
   cd forge-llm

2. Install dependencies for development:

   • Ensure you have forge and llm packages

Changelog

0.1.0 (Initial Release)

• Initial functionality for PR description generation
• Template detection for GitHub and GitLab repositories
• LLM integration via the llm package
• Commands for generating PR descriptions
• Customization options for templates and LLM providers

License

This project is licensed under the GNU General Public License version 3 - see the LICENSE file for details.