Support labeling based on the pull request/commit title and messages

[XVilka]

To apply the label based on the pattern match in one of the fields in:

• PR title
• PR body
• PR commit title
• PR commit body

[austince]

The commit-specific matching might be more work, as it would require fetching all the commits that are contained in the PR, but the PR title and body should be already available.

What about adding a label config object item like pr: { body?: StringOrMatchConfig[], title?: StringOrMatchConfig[] }?

Ex:

# Add 'test' label to any change to *.spec.js files within the source dir
# or with a PR title that is in the form 'test:*'
# or with a PR body that contains the word 'test' but not 'bug'
test:
 - src/**/*.spec.js
 - pr:
     title:
       - 'test:*'
     body:
       - any: [ '*test*' ]
         all: [ '*bug*' ]

This could then be expanded to include the commits:

# Add 'test' label to any change to *.spec.js files within the source dir
# or with a PR title that is in the form 'test:*'
# or with a PR body that contains the word 'test' but not 'bug'
# or has any commits with a title in the form 'test:*'
test:
 - src/**/*.spec.js
 - pr:
     title:
       - 'test:*'
     body:
       - any: [ '*test*' ]
         all: [ '*bug*' ]
- commits:
    title:
      - 'test:*'

In typescript, this could then be modeled like:

export interface MatchConfig {
  all?: string[];
  any?: string[];
}

export type MatchConfigEntry = string | MatchConfig;

export interface PRConfigEntry {
  title?: MatchConfigEntry[];
  body?: MatchConfigEntry[];
}

export type ConfigEntry = MatchConfigEntry | { pr: PRConfigEntry };

export interface Config {
  [label: string]: ConfigEntry[];
}

const config: Config = {
  // ...
  test: [
    'src/**/*.spec.js',
    {
      pr: {
        title: ['test:*'],
        body: [
          {
            any: ['*test*'],
            all: ['*bug*']
          }
        ]
      }
    }
  ]
  // ...
}

[ssbarnea]

Release Drafter already has the auto-labeling feature, see https://github.com/release-drafter/release-drafter#autolabeler

Sadly, AFAIK, it does not have the ability to be used as a check that prevent a change from being merged if is missing the right labels.

[felipefrancisco]

+1

[marekpeszt]

+1

[merklefruit]

+1

[silasdavis]

Can we also have the ability to specifically label based on git commit footers, e.g.

chore(foo): my fix

Risk: D
Urgency: 2

Signed-off-by: Silas Davis <silas@example.com>

This would play nicely with conventional commits (https://www.conventionalcommits.org/en/v1.0.0/#specification), for example.