Class: Gistory::ChangeLog

Inherits:
Object
  • Object
show all
Defined in:
lib/gistory/change_log.rb

Constant Summary collapse

LOCKFILE = 
"Gemfile.lock"

Instance Method Summary collapse

Constructor Details

#initialize(repo:) ⇒ ChangeLog

Returns a new instance of ChangeLog.



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# File 'lib/gistory/change_log.rb', line 7

def initialize(repo:)
  @repo = repo
end

Instance Method Details

#changelog_for_gem(gem_name) ⇒ Object 



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# File 'lib/gistory/change_log.rb', line 11

def changelog_for_gem(gem_name)
  version_changes = []
  commits_with_changes = @repo.changes_to_file(LOCKFILE)

  # no lockfile found or no changes to the lockfile found
  return [] if commits_with_changes.empty?

  previous_commit = commits_with_changes.shift
  previous_gem_spec = gem_version_at_commit_hash(previous_commit.short_hash, gem_name)
  # only one change to the lockfile was found and the gem was not there
  return [] if previous_gem_spec.nil?

  commits_with_changes.each do |current_commit|
    current_gem_spec = gem_version_at_commit_hash(current_commit.short_hash, gem_name)

    # we reached the end, the gem didn't exist back then
    # TODO: what if it was added then removed and then added again?
    break if current_gem_spec.nil?

    if current_gem_spec != previous_gem_spec
      version_changes << VersionChange.new(commit: previous_commit, version: previous_gem_spec)
    end

    previous_gem_spec = current_gem_spec
    previous_commit = current_commit
  end

  version_changes << VersionChange.new(commit: previous_commit, version: previous_gem_spec)

  version_changes
end