Conventional Commits Cheatsheet

conventional-commits-cheatsheet.md

Conventional Commit Messages

See how a minor change to your commit message style can make a difference.

Tip

Have a look at git-conventional-commits , a CLI util to ensure these conventions, determine version and generate changelogs

Commit Message Formats

Default

<type>(<optional scope>): <description>
empty separator line
<optional body>
empty separator line
<optional footer>

Merge Commit

Merge branch '<branch name>'

^{Follows default git merge message}

Revert Commit

Revert "<reverted commit subject line>"

^{Follows default git revert message}

Inital Commit

chore: init

Types

• API relevant changes
  • feat Commits, that adds or remove a new feature
  • fix Commits, that fixes a bug
• refactor Commits, that rewrite/restructure your code, however does not change any API behaviour
  • perf Commits are special refactor commits, that improve performance
• style Commits, that do not affect the meaning (white-space, formatting, missing semi-colons, etc)
• test Commits, that add missing tests or correcting existing tests
• docs Commits, that affect documentation only
• build Commits, that affect build components like build tool, ci pipeline, dependencies, project version, ...
• ops Commits, that affect operational components like infrastructure, deployment, backup, recovery, ...
• chore Miscellaneous commits e.g. modifying .gitignore

Scopes

The scope provides additional contextual information.

• Is an optional part of the format
• Allowed Scopes depends on the specific project
• Don't use issue identifiers as scopes

Breaking Changes Indicator

Breaking changes should be indicated by an ! before the : in the subject line e.g. feat(api)!: remove status endpoint

• Is an optional part of the format

Description

The description contains a concise description of the change.

• Is a mandatory part of the format
• Use the imperative, present tense: "change" not "changed" nor "changes"
  • Think of This commit will... or This commit should...
• Don't capitalize the first letter
• No dot (.) at the end

Body

The body should include the motivation for the change and contrast this with previous behavior.

• Is an optional part of the format
• Use the imperative, present tense: "change" not "changed" nor "changes"
• This is the place to mention issue identifiers and their relations

Footer

The footer should contain any information about Breaking Changes and is also the place to reference Issues that this commit refers to.

• Is an optional part of the format
• optionally reference an issue by its id.
• Breaking Changes should start with the word BREAKING CHANGES: followed by space or two newlines. The rest of the commit message is then used for this.

Examples

• feat: add email notifications on new direct messages
  

• feat(shopping cart): add the amazing button
  

• feat!: remove ticket list endpoint
  
  refers to JIRA-1337
  
  BREAKING CHANGES: ticket enpoints no longer supports list all entites.
  

• fix(shopping-cart): prevent order an empty shopping cart
  

• fix(api): fix wrong calculation of request body checksum
  

• fix: add missing parameter to service call
  
  The error occurred because of <reasons>.
  

• perf: decrease memory footprint for determine uniqe visitors by using HyperLogLog
  

• build: update dependencies
  

• build(release): bump version to 1.0.0
  

• refactor: implement fibonacci number calculation as recursion
  

• style: remove empty line
  

---

Git Hook Scripts to ensure commit message header format

Click to expand

commit-msg Hook (local)

• Create a commit-msg hook using git-conventional-commits cli

pre-receive Hook (server side)

• create following file in your repository folder .git/hooks/pre-receive

  #!/usr/bin/env bash
  
  # Pre-receive hook that will block commits with messges that do not follow regex rule
  
  commit_msg_type_regex='feat|fix|refactor|style|test|docs|build'
  commit_msg_scope_regex='.{1,20}'
  commit_msg_description_regex='.{1,100}'
  commit_msg_regex="^(${commit_msg_type_regex})(\(${commit_msg_scope_regex}\))?: (${commit_msg_description_regex})\$"
  merge_msg_regex="^Merge branch '.+'\$"
  
  zero_commit="0000000000000000000000000000000000000000"
  
  # Do not traverse over commits that are already in the repository
  excludeExisting="--not --all"
  
  error=""
  while read oldrev newrev refname; do
    # branch or tag get deleted
    if [ "$newrev" = "$zero_commit" ]; then
      continue
    fi
  
    # Check for new branch or tag
    if [ "$oldrev" = "$zero_commit" ]; then
      rev_span=`git rev-list $newrev $excludeExisting`
    else
      rev_span=`git rev-list $oldrev..$newrev $excludeExisting`
    fi
  
    for commit in $rev_span; do
      commit_msg_header=$(git show -s --format=%s $commit)
      if ! [[ "$commit_msg_header" =~ (${commit_msg_regex})|(${merge_msg_regex}) ]]; then
        echo "$commit" >&2
        echo "ERROR: Invalid commit message format" >&2
        echo "$commit_msg_header" >&2
        error="true"
      fi
    done
  done
  
  if [ -n "$error" ]; then
    exit 1
  fi

• ⚠ make .git/hooks/pre-receive executable (unix: chmod +x '.git/hooks/pre-receive')

---

References

• https://www.conventionalcommits.org/
• https://github.com/angular/angular/blob/master/CONTRIBUTING.md
• http://karma-runner.github.io/1.0/dev/git-commit-msg.html

• https://github.com/github/platform-samples/tree/master/pre-receive-hooks
• https://git.521000.bestmunity/t5/GitHub-Enterprise-Best-Practices/Using-pre-receive-hooks-in-GitHub-Enterprise/ba-p/13863

If you fix a bug in the build system
For example a ci config file
Is it A, B, C … or something else?

A: fix: update syntax error in ci config
B: build: fix syntax error in ci config
C: fix(ci): update syntax error in ci config

Definitely B, because fix as well as feat are only for interface/API related changes.

Hey. What type would I use, if I had some method, and I would only change some value in it, that would change the behavior of the program, but would not add or remove any feature.

A great example can be a method validate_registration(person), that would check for person age for example. In this example, how could I name the commit changing the minimum age from 18 to 15 years?

Should be feat because it will effect the API. Take feature as a synonym of behavior. When ever a behavior is changed by purpose it is most likely a feat commit if you repair an exit behavior it is most likely a fix commit.

Should be feat because it will effect the API. Take feature as a synonym of behavior. Wen ever a behavior is changed by purpose it is most likely a feat commit if you repair an exit behavior it is most likely a fix commit.

Thanks. I appreciate your gist and your quick response.