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# Using Contrib Rules
_Introduced in gitlint v0.12.0_
Contrib rules are community-**contrib**uted rules that are disabled by default, but can be enabled through configuration.
Contrib rules are meant to augment default gitlint behavior by providing users with rules for common use-cases without
forcing these rules on all gitlint users. This also means that users don't have to
re-implement these commonly used rules themselves as [user-defined](user_defined_rules) rules.
To enable certain contrib rules, you can use the `--contrib` flag.
```sh
$ cat examples/commit-message-1 | gitlint --contrib contrib-title-conventional-commits,CC1
1: CC1 Body does not contain a 'Signed-Off-By' line
1: CL1 Title does not start with one of fix, feat, chore, docs, style, refactor, perf, test: "WIP: This is the title of a commit message."
# These are the default violations
1: T3 Title has trailing punctuation (.): "WIP: This is the title of a commit message."
1: T5 Title contains the word 'WIP' (case-insensitive): "WIP: This is the title of a commit message."
2: B4 Second line is not empty: "The second line should typically be empty"
3: B1 Line exceeds max length (123>80): "Lines typically need to have a max length, meaning that they can't exceed a preset number of characters, usually 80 or 120."
```
Same thing using a `.gitlint` file:
```ini
[general]
# You HAVE to add the rule here to enable it, only configuring (such as below)
# does NOT enable it.
contrib=contrib-title-conventional-commits,CC1
[contrib-title-conventional-commits]
# Specify allowed commit types. For details see: https://www.conventionalcommits.org/
types = bugfix,user-story,epic
```
You can also configure contrib rules using [any of the other ways to configure gitlint](configuration.md).
## Available Contrib Rules
ID | Name | gitlint version | Description
------|-------------------------------------|------------------ |-------------------------------------------
CT1 | contrib-title-conventional-commits | >= 0.12.0 | Enforces [Conventional Commits](https://www.conventionalcommits.org/) commit message style on the title.
CC1 | contrib-requires-signed-off-by | >= 0.12.0 | Commit body must contain a `Signed-Off-By` line.
## CT1: contrib-title-conventional-commits ##
ID | Name | gitlint version | Description
------|---------------------------------------|--------------------|-------------------------------------------
CT1 | contrib-title-conventional-commits | >= 0.12.0 | Enforces [Conventional Commits](https://www.conventionalcommits.org/) commit message style on the title.
### Options ###
Name | gitlint version | Default | Description
---------------|--------------------|--------------|----------------------------------
types | >= 0.12.0 | `fix,feat,chore,docs,style,refactor,perf,test,revert,ci,build` | Comma separated list of allowed commit types.
## CC1: contrib-requires-signed-off-by ##
ID | Name | gitlint version | Description
------|---------------------------------------|--------------------|-------------------------------------------
CC1 | contrib-requires-signed-off-by | >= 0.12.0 | Commit body must contain a `Signed-Off-By` line. This means, a line that starts with the `Signed-Off-By` keyword.
## Contributing Contrib rules
We'd love for you to contribute new Contrib rules to gitlint or improve existing ones! Please visit the [Contributing](contributing) page on how to get started.
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