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A simple git commit checker

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# git-gud
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A simple git commit checker. I often use a commit message template I created a while ago, and I wanted to make sure that everything was in the right place after writing a commit, that's why this script exists. Use it if you want to *git gud* too. To add this custom git command to git, just place the file in a folder that's in your path (a.k.a `PATH`). You can [setup `git-gud` as custom command](https://github.com/aaossa/git-gud/wiki/Setup-'git-gud'-as-custom-command) or [setup `git-gud` as `post-commit` hook](https://github.com/aaossa/git-gud/wiki/Setup-'git-gud'-as-'post-commit'-hook).

### Usage

You can use the same commit limmits as in `git log`: `--author`, `--number`, `--until`, `--before`, and more. ([`git-log` docs](https://git-scm.com/docs/git-log#_commit_limiting)). Some basic examples:

```bash
# Check last commit
$ git gud

# Check <number> commits in the current branch
$ git gud -<number>
$ git gud -n <number>
$ git gud --max-count=<number>

# Check commits in another branch
$ git gud <branch>
$ git gud <branch> -<number>
$ git gud -n <number> <branch>

# And... a sample output
$ git gud

Checking... afaeaf5
> OK: Author name format is valid (Antonio Ossa)
> OK: Author email format is valid (aaossa@uc.cl)
> OK: Commiter name format is valid (Antonio Ossa)
> OK: Commiter email format is valid (aaossa@uc.cl)
> ERROR: Subject is too long (59 > 50)
> ERROR: Body is empty (0 == 0)
> OK: Body includes comment (2 > 0)
> OK: 'Signed-off-by' line is not empty (42 > 0)
> OK: 'Signed-off-by' line has author information
> WARNING: Signature is not valid (Status: N)
```

### Checks

- [x] Commit author name is in a valid format ( `Antonio Ossa`)
- [x] Commit author name is the same in your config file
- [x] Commit author email is in a valid format (`aaossa@uc.cl`)
- [x] Commit author email is the same in your config file
- [x] Commit subject message uses a maximum of **50 characters**
- [x] Commit body message is not empty
- [x] Commit body message lines use a maximum of **72 characters**
- [x] Commit body message has lines with comments (i.e. not "Signed-off-by: ...")
- [x] Commit body message has a "Signed-off-by: ..." line (`Signed-off-by: Antonio Ossa <aaossa@uc.cl>`)
- [x] Commit signature is "good"

### Template

This is the template I use. You can find it as [`.gitmessage`](https://github.com/aaossa/git-gud/blob/master/.gitmessage) in this repo and install it following [these instructions](https://github.com/aaossa/git-gud/wiki/Setup-a-commit-template). The script assumes that you're following these conventions, but you can use your own template if you want (or none) and customize the checker too! That's why is OSS :heart::

```
# |<----  Using a Maximum Of 50 Characters  ---->|
# If this commit is applied, it will...
# Examples of imperative mood: Refactor X, Update Y, Remove Z
Subject

# |<----   Try To Limit Each Line to a Maximum Of 72 Characters   ---->|
# What/why/how was this change made?

# Any references to relevant tickets, articles, resources, etc?
# Example: GitHub issue #23

# Something more?
# Reported-by: A person or @somebody
Signed-off-by: Antonio Ossa <aaossa@uc.cl>

# (:heart: emoji? http://emoji.muan.co/)

```

### To do

- [X] ~~Wiki: How to use template~~
- [X] ~~Instructions: Use git-gud as custom command~~
- [X] ~~Instructions: Use git-gud as post-commit hook~~
- [x] ~~Script: Allow check multiple commits (`git gud -n 10`)~~
- [x] ~~Script: Allow check on another branch (`git gud branch`)~~
- [ ] Script: Check imperative mood in subject
- [ ] Script: Add flags about output verbosity (`--full`/current, `--warn`/warnings+errors, `--error`/errors only)

### License

This software is released under the [MIT License](https://opensource.org/licenses/MIT)

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