# 
[](https://crates.io/crates/lumen)
lumen is a command-line tool that uses AI to generate commit messages, summarise git diffs or past commits, and more without requiring an API key.
# Features 🔅
- Generate commit message for staged changes
- Generate summary for changes in a git commit by providing its [SHA-1](https://graphite.dev/guides/git-hash)
- Generate summary for changes in git diff (staged/unstaged)
- Ask questions about a specific change
- Fuzzy-search for the commit to generate a summary
- Free and unlimited - no API key required to work out of the box
- Pretty output formatting enabled by Markdown
- Supports multiple AI providers
# Usage 🔅
Try `lumen --help`
To generate a commit message for staged changes.
See [Advanced Configuration](#advanced-configuration) to configure commit types
```zsh
lumen draft
```
The commit message can be piped to other commands
```zsh
# copy the commit message to clipboard (macos and linux, respectively)
lumen draft | pbcopy
lumen draft | xclip -selection clipboard
# open the commit message in your code editor
lumen draft | code -
# directly commit with the generated message
lumen draft | git commit -F -
```
The AI generates more meaningful commit messages when you provide context.
```zsh
lumen draft
# Output: "feat(button.tsx): Change button color to blue"
lumen draft --context "match brand guidelines"
# Output: "feat(button.tsx): Update button color to align with brand identity"
```
To summarise a commit, pass in its SHA-1
```zsh
lumen explain HEAD
lumen explain cc50651f
```
To use the interactive fuzzy-finder (requires: fzf)
```zsh
lumen list
```
To generate a summary for the current git diff
```zsh
lumen explain --diff
lumen explain --diff --staged
```
You can ask a question about the diff (or a commit) using `--query`
```zsh
lumen explain --diff --query "how will this change affect performance?"
lumen explain HEAD~2 --query "how can this be improved?"
```
AI Provider can be configured by using CLI arguments or Environment variables (see also: [Advanced Configuration](#advanced-configuration)).
```sh
-p, --provider [env: LUMEN_AI_PROVIDER] [default: phind] [possible values: openai, phind, groq, claude, ollama, openrouter]
-k, --api-key [env: LUMEN_API_KEY]
-m, --model [env: LUMEN_AI_MODEL]
# eg: lumen -p="openai" -k="" -m="gpt-4o" explain HEAD
# eg: lumen -p="openai" -k="" -m="gpt-4o" draft
# eg: LUMEN_AI_PROVIDER="openai" LUMEN_API_KEY="" LUMEN_AI_MODEL="gpt-4o" lumen list
```
### Supported providers
| Provider | API Key Required | Models |
|----------------------------------------------------------------------------------------------------------------------|------------------|---------------------------------------------------------------------------------------------|
| [Phind](https://www.phind.com/agent) `phind` (Default) | No | `Phind-70B` |
| [Groq](https://groq.com/) `groq` | Yes (free) | `llama2-70b-4096`, `mixtral-8x7b-32768` (default: `mixtral-8x7b-32768`) |
| [OpenAI](https://platform.openai.com/docs/guides/text-generation/chat-completions-api) `openai` | Yes | `gpt-4o`, `gpt-4o-mini`, `gpt-4`, `gpt-3.5-turbo` (default: `gpt-4o-mini`) |
| [Claude](https://claude.ai/new) `claude` | Yes | [see list](https://docs.anthropic.com/en/docs/about-claude/models#model-names) (default: `claude-3-5-sonnet-20241022`) | |
| [Ollama](https://github.com/ollama/ollama) `ollama` | No (local) | [see list](https://github.com/ollama/ollama/blob/main/docs/api.md#model-names) (required) | |
| [OpenRouter](https://openrouter.ai/) `openrouter` | Yes | [see list](https://openrouter.ai/models) (default: `anthropic/claude-3.5-sonnet`) | |
# Installation 🔅
### Using [Homebrew](https://brew.sh/) (MacOS and Linux)
```
brew tap jnsahaj/lumen
brew install --formula lumen
```
### Using [Cargo](https://github.com/rust-lang/cargo)
> [!IMPORTANT]
> `cargo` is a package manager for `rust`,
> and is installed automatically when you install `rust`.
> see [installation guide](https://doc.rust-lang.org/cargo/getting-started/installation.html)
```
cargo install lumen
```
# Prerequisites 🔅
1. git
2. [fzf](https://github.com/junegunn/fzf) (optional): Required for `lumen list` command
3. [mdcat](https://github.com/swsnr/mdcat) (optional): Required for pretty output formatting
# Advanced Configuration 🔅
`lumen` can be configured using a configuration file. You can specify `lumen.config.json` at the root of your git-tracked project, or use `--config "./path/to/config.json`
```json
{
"provider": "...",
"model": "...",
"api_key": "...",
}
```
You can also specify command-specific options (currently only `draft.commit_types` is supported)
```json
{
"draft": {
"commit_types": {
"": ""
}
}
}
```
An example configuration file can look like
```json
{
"provider": "openai",
"model": "gpt-4o",
"api_key": "sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
"draft": {
"commit_types": {
"docs": "Documentation only changes",
"style": "Changes that do not affect the meaning of the code",
"refactor": "A code change that neither fixes a bug nor adds a feature",
"perf": "A code change that improves performance",
"test": "Adding missing tests or correcting existing tests",
"build": "Changes that affect the build system or external dependencies",
"ci": "Changes to our CI configuration files and scripts",
"chore": "Other changes that don't modify src or test files",
"revert": "Reverts a previous commit",
"feat": "A new feature",
"fix": "A bug fix"
}
}
}
```
`lumen` uses the `commit_types` specified in the example above as defaults if none are provided
### Precedence Order
Since there are multiple ways of configuring options for `lumen`, there is a defined precedence order
```
CLI Flags > Configuration File > Environment Variables > Default options
```
This also allows for mixing different methods.
For example, if you want to use `Ollama` for a specific project, and `OpenAI` for all others, you can do the following:
```sh
# .zshrc/.bashrc
export LUMEN_AI_PROVIDER="openai"
export LUMEN_API_KEY="sk-xxxxxxxxxxxxxxxxxxxxxxxx"
```
The above will apply globally. You can override this for a specific project by either specifying a configuration file or using CLI flags.
```json
{
"provider": "ollama",
"model": "llama3.2"
}
```
OR
```sh
lumen -p "ollama" -m "llama3.2" draft
```