59 lines
1.8 KiB
Ruby
59 lines
1.8 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Changelog
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# Parsing and generating of Markdown changelogs.
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class Generator
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# The regex used to parse a release header.
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RELEASE_REGEX =
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/^##\s+(?<version>#{Gitlab::Regex.unbounded_semver_regex})/.freeze
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# The `input` argument must be a `String` containing the existing
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# changelog Markdown. If no changelog exists, this should be an empty
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# `String`.
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def initialize(input = '')
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@lines = input.lines
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@locations = {}
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@lines.each_with_index do |line, index|
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matches = line.match(RELEASE_REGEX)
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next if !matches || !matches[:version]
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@locations[matches[:version]] = index
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end
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end
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# Generates the Markdown for the given release and returns the new
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# changelog Markdown content.
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#
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# The `release` argument must be an instance of
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# `Gitlab::Changelog::Release`.
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def add(release)
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versions = [release.version, *@locations.keys]
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VersionSorter.rsort!(versions)
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new_index = versions.index(release.version)
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new_lines = @lines.dup
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markdown = release.to_markdown
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if (insert_after = versions[new_index + 1])
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line_index = @locations[insert_after]
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new_lines.insert(line_index, markdown)
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else
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# When adding to the end of the changelog, the previous section only
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# has a single newline, resulting in the release section title
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# following it immediately. When this is the case, we insert an extra
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# empty line to keep the changelog readable in its raw form.
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new_lines.push("\n") if versions.length > 1
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new_lines.push(markdown.rstrip)
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new_lines.push("\n")
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end
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new_lines.join
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end
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end
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end
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end
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