git-commit-semantic

name	git-commit-semantic
description	A skill for writing semantic git commit messages based on Conventional Commits. Use when creating commit messages to ensure clarity and consistency.
author	with-philia

Git Commit Semantic Submission

The Conventional Commits specification is a lightweight convention on top of commit messages. It provides an easy set of rules for creating an explicit commit history; which makes it easier to write automated tools on top of. This convention dovetails with SemVer, by describing the features, fixes, and breaking changes made in commit messages.

Commit Message Structure

<type>[optional scope]: <description>

[optional body]

[optional footer(s)]

Types

1. fix: a commit of the type fix patches a bug in your codebase (correlates with PATCH in Semantic Versioning).
2. feat: a commit of the type feat introduces a new feature to the codebase (correlates with MINOR in Semantic Versioning).
3. BREAKING CHANGE: a commit that has a footer BREAKING CHANGE:, or appends a ! after the type/scope, introduces a breaking API change (correlating with MAJOR in Semantic Versioning).
4. Other allowed types: build, chore, ci, docs, style, refactor, perf, test, and others.

Examples

Commit message with description and breaking change footer

feat: allow provided config object to extend other configs

BREAKING CHANGE: `extends` key in config file is now used for extending other config files

Commit message with ! to draw attention to breaking change

feat!: send an email to the customer when a product is shipped

Commit message with scope and ! to draw attention to breaking change

feat(api)!: send an email to the customer when a product is shipped

Commit message with both ! and BREAKING CHANGE footer

chore!: drop support for Node 6

BREAKING CHANGE: use JavaScript features not available in Node 6.

Commit message with no body

docs: correct spelling of CHANGELOG

Commit message with scope

feat(lang): add Polish language

Commit message with multi-paragraph body and multiple footers

fix: prevent racing of requests

Introduce a request id and a reference to latest request. Dismiss
incoming responses other than from latest request.

Remove timeouts which were used to mitigate the racing issue but are
obsolete now.

Reviewed-by: Z
Refs: #123

Specification

The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in RFC 2119.

1. Commits MUST be prefixed with a type, which consists of a noun, feat, fix, etc., followed by the OPTIONAL scope, OPTIONAL !, and REQUIRED terminal colon and space.
2. The type feat MUST be used when a commit adds a new feature to your application or library.
3. The type fix MUST be used when a commit represents a bug fix for your application.
4. A scope MAY be provided after a type. A scope MUST consist of a noun describing a section of the codebase surrounded by parenthesis, e.g., fix(parser):
5. A description MUST immediately follow the colon and space after the type/scope prefix. The description is a short summary of the code changes.
6. A longer commit body MAY be provided after the short description, providing additional contextual information about the code changes. The body MUST begin one blank line after the description.
7. A commit body is free-form and MAY consist of any number of newline separated paragraphs.
8. One or more footers MAY be provided one blank line after the body. Each footer MUST consist of a word token, followed by either a :<space> or <space># separator, followed by a string value.
9. A footer's token MUST use - in place of whitespace characters, e.g., Acked-by. An exception is made for BREAKING CHANGE, which MAY also be used as a token.
10. A footer's value MAY contain spaces and newlines, and parsing MUST terminate when the next valid footer token/separator pair is observed.
11. Breaking changes MUST be indicated in the type/scope prefix of a commit, or as an entry in the footer.
12. If included as a footer, a breaking change MUST consist of the uppercase text BREAKING CHANGE, followed by a colon, space, and description.
13. If included in the type/scope prefix, breaking changes MUST be indicated by a ! immediately before the :. If ! is used, BREAKING CHANGE: MAY be omitted from the footer section.
14. Types other than feat and fix MAY be used in your commit messages.
15. The units of information that make up Conventional Commits MUST NOT be treated as case sensitive by implementors, with the exception of BREAKING CHANGE which MUST be uppercase.
16. BREAKING-CHANGE MUST be synonymous with BREAKING CHANGE, when used as a token in a footer.

Why Use Conventional Commits

• Automatically generating CHANGELOGs.
• Automatically determining a semantic version bump (based on the types of commits landed).
• Communicating the nature of changes to teammates, the public, and other stakeholders.
• Triggering build and publish processes.
• Making it easier for people to contribute to your projects, by allowing them to explore a more structured commit history.

FAQ

How should I deal with commit messages in the initial development phase?

We recommend that you proceed as if you've already released the product. Typically somebody, even if it's your fellow software developers, is using your software. They'll want to know what's fixed, what breaks etc.

Are the types in the commit title uppercase or lowercase?

Any casing may be used, but it's best to be consistent.

What do I do if the commit conforms to more than one of the commit types?

Go back and make multiple commits whenever possible. Part of the benefit of Conventional Commits is its ability to drive us to make more organized commits and PRs.

Doesn’t this discourage rapid development and fast iteration?

It discourages moving fast in a disorganized way. It helps you be able to move fast long term across multiple projects with varied contributors.

Might Conventional Commits lead developers to limit the type of commits they make because they'll be thinking in the types provided?

Conventional Commits encourages us to make more of certain types of commits such as fixes. Other than that, the flexibility of Conventional Commits allows your team to come up with their own types and change those types over time.

How does this relate to SemVer?

fix type commits should be translated to PATCH releases. feat type commits should be translated to MINOR releases. Commits with BREAKING CHANGE in the commits, regardless of type, should be translated to MAJOR releases.

How should I version my extensions to the Conventional Commits Specification?

We recommend using SemVer to release your own extensions to this specification.

What do I do if I accidentally use the wrong commit type?

Prior to merging or releasing the mistake, we recommend using git rebase -i to edit the commit history. After release, the cleanup will be different according to what tools and processes you use.

Do all my contributors need to use the Conventional Commits specification?

No! If you use a squash based workflow on Git lead maintainers can clean up the commit messages as they're merged—adding no workload to casual committers.

How does Conventional Commits handle revert commits?

Conventional Commits does not make an explicit effort to define revert behavior. One recommendation is to use the revert type, and a footer that references the commit SHAs that are being reverted.