This GitHub action posts comments on a PR that can vary depending on which files are being changed in the PR.
Create your workflow file .github/workflows/pr-commenter.yml as follows.
name: "PR Commenter"
on:
- pull_request_target
jobs:
pr-comment:
runs-on: ubuntu-latest
steps:
- uses: exercism/[email protected]
with:
github-token: "${{ github.token }}"
config-file: ".github/pr-commenter.yml"Create your action configuration file .github/pr-commenter.yml as follows.
comment:
on-update: recreate
header: |
Thank you for contributing to this repository :tada:.
footer: |
---
Automated comment created by [PR Commenter](https://github.com/exercism/pr-commenter-action) :robot:.
snippets:
- id: any-markdown-file-changed
files:
- '*.md'
- '**/*.md'
body: |
It looks like you're changing a Markdown file.
Make sure your changes follow our [language guidelines](some-link) when writing documentation.Auth token used to manage issues or pull requests.
Required: true
Default: ${{ github.token }}
Required: true
Default: .github/pr-commenter.yml
To reference a config file in another repo use the format: <owner>/<repo>@<ref>:<path>, for example someuser/my-repo@v1:.github/pr-commenter.yml. NOTE: make sure that "my-repo" is public and has "Workflow permissions" allowing files to be read.
Dictates what should happen if there is no comment on this PR yet. For almost all use cases, you want to keep the default behavior. The custom nothing option makes sense if you're using this action twice on the same PR, and you want the second execution not to create a new comment, but only edit it if it already exists from the first execution.
create- create a new commentnothing- do not create a new comment
Also accepts a Mustache template that evaluates to one of the above values.
Required: false
Default: create
Dictates what should happen if a comment was already created on this PR, but more changes were pushed to the PR and the comment needs to change.
recreate- delete the old comment and create a new oneedit- edit the old commentnothing- leave the old comment unchanged
Also accepts a Mustache template that evaluates to one of the above values.
Required: true
Default: recreate
An optional text to be included at the beginning of each comment.
Required: false
An optional text to be included at the end of each comment.
Required: false
A list of comment snippet configurations. At least one snippet is required. Note that a PR comment will only be created if at least one of the snippets match, even if comment.header and/or comment.footer are given.
Required: true
A string consisting of letters, numbers, -, and _ or a Mustache template that evaluates to such a string.
Snippet ids are used to check whether a comment's content changed. If you're using a template variable in the snippets's body and you want to recreate the whole comment when that variable changes value, use it in the snippet's id too.
Required: true
The text to be included in the PR comment.
Required: true
Comment snippet bodies and ids (as well as comment.on-create, comment.on-update, comment.header, and comment.footer) are Mustache templates.
Variables for the template can be provided via the template-variables input which should be a string containing a valid JSON.
You can use the context and expression syntax to assemble the JSON and set-output to calculate data for the template in separate steps.
name: "PR Commenter"
on:
- pull_request_target
jobs:
pr-comment:
runs-on: ubuntu-latest
steps:
- name: Calculate some template variables
id: vars
run: |
echo ::set-output name=today::"$(date +%d-%m-%Y)"
- uses: exercism/[email protected]
with:
template-variables: |
{
"today": "${{ steps.vars.outputs.today }}",
"prAuthor": "${{ github.event.pull_request.user.login }}",
"branchNamePrefix": ${{ startsWith(github.event.pull_request.head.ref, 'ref-') }}
}comment:
header: |
Hi {{ prAuthor }}! Thank you for your contribution.
{{^branchNamePrefix}}Your branch name doesn't start with the required prefix 'ref-'.{{/branchNamePrefix}}Note that values such as the PR's title, body, or branch name should be considered unsafe user input.
Here's a more complex example of using template variables. Let's say you have a multiline file that changes often, and you want to always include the newest content of the file in the snippet.
To ensure the comment will be recreated when the file changes, use the file's hash in the snippet's id.
To ensure that newline characters are handled correctly, use environment variables instead of job outputs and toJSON.
name: "PR Commenter"
on:
- pull_request_target
jobs:
pr-comment:
runs-on: ubuntu-latest
steps:
- name: Set environment variables
run: |
IMPORTANT_FILE_CONTENT=$(cat important_file)
echo "IMPORTANT_FILE_CONTENT<<EOF" >> $GITHUB_ENV
echo "$IMPORTANT_FILE_CONTENT" >> $GITHUB_ENV
echo "EOF" >> $GITHUB_ENV
- uses: exercism/[email protected]
with:
template-variables: |
{
"importantFileContent": ${{ toJSON(env.IMPORTANT_FILE_CONTENT) }},
"importnatFileHash": ${{ toJSON(hashFiles('important_file.txt')) }}
}comment:
snippets:
- id: snippet_{{ importnatFileHash }}}
- files:
- 'important_file.txt'
- body: |
This is very important:
{{ importantFileContent }}A list of globs (strings) and/or match objects. If at least one file changed in the PR matches at least one of the globs or match objects, this snippet's body will be included in the comment.
Example:
# any markdown file changed in any directory
comment:
snippets:
- id: any-markdown-file-changed
files:
- '*.md'
- '**/*.md'A match object contains the keys any and/or all with a list of globs.
all- every file changed in this PR must match every glob in this listany- at least one file changed in this PR must match every glob in this list
Example:
# at least one root-level markdown file changed
# and none of the changed files is the README.md
comment:
snippets:
- id: any-markdown-file-changed-but-readme
files:
- any: ['*.md']
all: ['!README.md']Required: true
This GitHub action uses the minimatch library for glob matching. A object with options can be provided under comment.glob-options to modify the behavior of this library. See the list of minimatch options for the list of supported options.
Example:
# Make all globs also match hidden files and directories
comment:
glob-options:
dot: true- Install the required NodeJS version as specified in
.tool-versions. The recommended way to manage multiple NodeJS versions is to use asdf. - Install the dependencies with
npm install. - Run the tests with
npm run testand the linter withnpm run lint.
This library was originally created by @angelikatyborska. It is maintained by @angelikatyborska and the Exercism team. See the GitHub contributors graph for a full list of contributors.
![dependabot[bot] avatar](https://avatars.githubusercontent.com/in/29110?v=4 "dependabot[bot]")
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