2018-12-05 23:21:45 +05:30
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# frozen_string_literal: true
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require 'json'
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2019-03-02 22:35:43 +05:30
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URL_LIMIT_SUBJECT = "https://chris.beams.io/posts/git-commit/#limit-50"
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URL_GIT_COMMIT = "https://chris.beams.io/posts/git-commit/"
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2018-12-05 23:21:45 +05:30
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# rubocop: disable Style/SignalException
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# rubocop: disable Metrics/CyclomaticComplexity
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# rubocop: disable Metrics/PerceivedComplexity
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# Perform various checks against commits. We're not using
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# https://github.com/jonallured/danger-commit_lint because its output is not
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# very helpful, and it doesn't offer the means of ignoring merge commits.
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class EmojiChecker
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DIGESTS = File.expand_path('../../fixtures/emojis/digests.json', __dir__)
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ALIASES = File.expand_path('../../fixtures/emojis/aliases.json', __dir__)
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# A regex that indicates a piece of text _might_ include an Emoji. The regex
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# alone is not enough, as we'd match `:foo:bar:baz`. Instead, we use this
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# regex to save us from having to check for all possible emoji names when we
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# know one definitely is not included.
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LIKELY_EMOJI = /:[\+a-z0-9_\-]+:/
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def initialize
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names = JSON.parse(File.read(DIGESTS)).keys +
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JSON.parse(File.read(ALIASES)).keys
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@emoji = names.map { |name| ":#{name}:" }
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end
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def includes_emoji?(text)
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return false unless text.match?(LIKELY_EMOJI)
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@emoji.any? { |emoji| text.include?(emoji) }
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end
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end
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def fail_commit(commit, message)
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fail("#{commit.sha}: #{message}")
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end
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def warn_commit(commit, message)
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warn("#{commit.sha}: #{message}")
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end
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def lines_changed_in_commit(commit)
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commit.diff_parent.stats[:total][:lines]
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end
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def subject_starts_with_capital?(subject)
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first_char = subject.chars.first
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first_char.upcase == first_char
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end
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def ce_upstream?
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gitlab.mr_labels.any? { |label| label == 'CE upstream' }
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end
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def too_many_changed_lines?(commit)
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commit.diff_parent.stats[:total][:files] > 3 &&
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lines_changed_in_commit(commit) >= 30
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end
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2019-05-18 00:54:41 +05:30
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def emoji_checker
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@emoji_checker ||= EmojiChecker.new
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end
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2018-12-05 23:21:45 +05:30
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2019-05-18 00:54:41 +05:30
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def unicode_emoji_regex
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@unicode_emoji_regex ||= %r((
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2018-12-05 23:21:45 +05:30
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[\u{1F300}-\u{1F5FF}] |
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[\u{1F1E6}-\u{1F1FF}] |
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[\u{2700}-\u{27BF}] |
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[\u{1F900}-\u{1F9FF}] |
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[\u{1F600}-\u{1F64F}] |
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[\u{1F680}-\u{1F6FF}] |
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[\u{2600}-\u{26FF}]
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))x
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2019-05-18 00:54:41 +05:30
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end
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def lint_commit(commit)
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# For now we'll ignore merge commits, as getting rid of those is a problem
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# separate from enforcing good commit messages.
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return false if commit.message.start_with?('Merge branch')
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# We ignore revert commits as they are well structured by Git already
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return false if commit.message.start_with?('Revert "')
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failures = false
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subject, separator, details = commit.message.split("\n", 3)
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if subject.split.length < 3
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fail_commit(
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commit,
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'The commit subject must contain at least three words'
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)
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failures = true
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end
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if subject.length > 72
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fail_commit(
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commit,
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'The commit subject may not be longer than 72 characters'
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)
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failures = true
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elsif subject.length > 50
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warn_commit(
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commit,
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"This commit's subject line is acceptable, but please try to [reduce it to 50 characters](#{URL_LIMIT_SUBJECT})."
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)
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end
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unless subject_starts_with_capital?(subject)
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fail_commit(commit, 'The commit subject must start with a capital letter')
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failures = true
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end
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if subject.end_with?('.')
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fail_commit(commit, 'The commit subject must not end with a period')
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failures = true
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end
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if separator && !separator.empty?
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fail_commit(
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commit,
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'The commit subject and body must be separated by a blank line'
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)
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failures = true
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end
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details&.each_line do |line|
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line = line.strip
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2018-12-05 23:21:45 +05:30
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2019-05-18 00:54:41 +05:30
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next if line.length <= 72
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url_size = line.scan(%r((https?://\S+))).sum { |(url)| url.length }
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# If the line includes a URL, we'll allow it to exceed 72 characters, but
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# only if the line _without_ the URL does not exceed this limit.
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next if line.length - url_size <= 72
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fail_commit(
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commit,
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'The commit body should not contain more than 72 characters per line'
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)
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failures = true
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end
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if !details && too_many_changed_lines?(commit)
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fail_commit(
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commit,
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'Commits that change 30 or more lines across at least three files ' \
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'must describe these changes in the commit body'
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)
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failures = true
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end
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if emoji_checker.includes_emoji?(commit.message)
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fail_commit(
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commit,
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'Avoid the use of Markdown Emoji such as `:+1:`. ' \
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'These add no value to the commit message, ' \
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'and are displayed as plain text outside of GitLab'
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)
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failures = true
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end
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if commit.message.match?(unicode_emoji_regex)
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fail_commit(
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commit,
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'Avoid the use of Unicode Emoji. ' \
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'These add no value to the commit message, ' \
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'and may not be displayed properly everywhere'
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)
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failures = true
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end
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if commit.message.match?(%r(([\w\-\/]+)?(#|!|&|%)\d+\b))
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fail_commit(
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commit,
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'Use full URLs instead of short references ' \
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'(`gitlab-org/gitlab-ce#123` or `!123`), as short references are ' \
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'displayed as plain text outside of GitLab'
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)
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failures = true
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end
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failures
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end
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def lint_commits(commits)
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failed = commits.select do |commit|
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lint_commit(commit)
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2018-12-05 23:21:45 +05:30
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end
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2019-05-18 00:54:41 +05:30
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if failed.any?
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2018-12-05 23:21:45 +05:30
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markdown(<<~MARKDOWN)
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## Commit message standards
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One or more commit messages do not meet our Git commit message standards.
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For more information on how to write a good commit message, take a look at
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[How to Write a Git Commit Message](#{URL_GIT_COMMIT}).
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2018-12-05 23:21:45 +05:30
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Here is an example of a good commit message:
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Reject ruby interpolation in externalized strings
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When using ruby interpolation in externalized strings, they can't be
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detected. Which means they will never be presented to be translated.
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To mix variables into translations we need to use `sprintf`
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instead.
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Instead of:
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_("Hello \#{subject}")
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Use:
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_("Hello %{subject}") % { subject: 'world' }
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This is an example of a bad commit message:
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updated README.md
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This commit message is bad because although it tells us that README.md is
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updated, it doesn't tell us why or how it was updated.
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MARKDOWN
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end
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end
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if git.commits.length > 10 && !ce_upstream?
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warn(
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'This merge request includes more than 10 commits. ' \
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'Please rebase these commits into a smaller number of commits.'
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)
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else
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lint_commits(git.commits)
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end
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