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require 'time'
desc 'Generate the CHANGELOG file'
task :changelog do
class Entry
attr_reader :type
def initialize(ref, author, time, message)
@ref = ref
@author = author
@time = time
@message = message
if (m = /New: (.*)/i.match(@message))
@type = :feature
@message = m[1]
elsif (m = /Fix: (.*)/i.match(@message))
@type = :bugfix
@message = m[1]
else
@type = :other
end
end
def to_s
" * #{@message}\n"
end
end
class Release
attr_reader :date, :version, :tag
def initialize(tag, predecessor)
@tag = tag
# We only support release tags in the form X.X.X
@version = /\d+\.\d+\.\d+/.match(tag)
# Construct a Git range.
interval = predecessor ? "#{predecessor.tag}..#{@tag}" : @tag
# Get the date of the release
git_show_tag = `git show #{tag}`.encode('UTF-8', invalid: :replace,
undef: :replace)
date = Time.parse(/Date: (.*)/.match(git_show_tag)[1]).utc
@date = date.strftime("%Y-%m-%d")
@entries = []
# Use -z option for git-log to get 0 bytes as separators.
`git log -z #{interval}`.split("\0").each do |commit|
# We ignore merges.
next if commit =~ /^Merge: \d*/
ref, author, time, _, message = commit.split("\n", 5)
ref = ref[/commit ([0-9a-f]+)/, 1]
author = author[/Author: (.*)/, 1].strip
time = Time.parse(time[/Date: (.*)/, 1]).utc
# Eleminate git-svn-id: lines
message.gsub!(/git-svn-id: .*\n/, '')
# Eliminate Signed-off-by: lines
message.gsub!(/Signed-off-by: .*\n/, '')
message.strip!
@entries << Entry.new(ref, author, time, message)
end
end
def empty?
@entries.empty?
end
def to_s
s = ''
if hasFeatures? || hasFixes?
if hasFeatures?
s << "== New Features\n\n"
@entries.each do |entry|
s << entry.to_s if entry.type == :feature
end
s << "\n"
end
if hasFixes?
s << "== Bug Fixes\n\n"
@entries.each do |entry|
s << entry.to_s if entry.type == :bugfix
end
s << "\n"
end
else
@entries.each do |entry|
s << entry.to_s
end
end
s
end
private
def hasFeatures?
@entries.each do |entry|
return true if entry.type == :feature
end
false
end
def hasFixes?
@entries.each do |entry|
return true if entry.type == :bugfix
end
false
end
end
class ChangeLog
def initialize
@releases = []
predecessor = nil
getReleaseVersions.each do |version|
@releases << (predecessor = Release.new(version, predecessor))
end
end
def to_s
s = ''
@releases.reverse.each do |release|
next if release.empty?
# We use RDOC markup syntax to generate a title
if release.version
s << "= Release #{release.version} (#{release.date})\n\n"
else
s << "= Next Release (Some Day)\n\n"
end
s << release.to_s + "\n"
end
s
end
private
# 'git tag' is not sorted numerically. This function implements a
# numerical comparison for tag versions of the format 'release-X.X.X'. X
# can be a multi-digit number.
def compareTags(a, b)
def versionToComparable(v)
/\d+\.\d+\.\d+/.match(v)[0].split('.').map{ |l| sprintf("%03d", l.to_i)}.
join('.')
end
versionToComparable(a) <=> versionToComparable(b)
end
def getReleaseVersions
# Get list of release tags from Git repository
releaseVersions = `git tag`.split("\n").map { |r| r.chomp }.
delete_if { |r| ! (/v\d+\.\d+\.\d+/ =~ r) }.
sort{ |a, b| compareTags(a, b) }
releaseVersions << 'HEAD'
end
end
File.open('CHANGELOG', 'w+') do |changelog|
changelog.puts ChangeLog.new.to_s
end
end
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