[DOC] Update changelogse.rake

- Exclude CI-skipped commits from changelogs
- Make timestamps in a ISO 8601-like format

rakelib/changelogs.rake

@@ -3,7 +3,10 @@ task "build" => "changelogs"
 changelog = proc do |output, ver = nil, prev = nil|
   ver &&= Gem::Version.new(ver)
   range = [[prev], [ver, "HEAD"]].map {|ver, branch| ver ? "v#{ver.to_s}" : branch}.compact.join("..")
-  IO.popen(%W[git log --format=fuller --topo-order --no-merges #{range}]) do |log|
+  cmd = %W[git log --date=iso --format=fuller --topo-order --no-merges
+               --invert-grep --fixed-strings --grep=#{'[ci skip]'}
+               #{range} --]
+  IO.popen(cmd) do |log|
     line = log.gets
     FileUtils.mkpath(File.dirname(output))
     File.open(output, "wb") do |f|
@@ -18,13 +21,13 @@ changelog = proc do |output, ver = nil, prev = nil|
 end
 
 tags = IO.popen(%w[git tag -l v[0-9]*]).grep(/v(.*)/) {$1}
-tags.sort_by! {|tag| tag.scan(/\d+/).map(&:to_i)}
-if !tags.empty? and IO.popen(%W[git log --format=%H v#{tags.last}..HEAD], &:read).empty?
-  tags.pop
-end
-tags.inject(nil) do |prev, tag|
-  task("logs/ChangeLog-#{tag}") {|t| changelog[t.name, tag, prev]}
-  tag
+unless tags.empty?
+  tags.sort_by! {|tag| tag.scan(/\d+/).map(&:to_i)}
+  tags.pop if IO.popen(%W[git log --format=%H v#{tags.last}..HEAD --], &:read).empty?
+  tags.inject(nil) do |prev, tag|
+    task("logs/ChangeLog-#{tag}") {|t| changelog[t.name, tag, prev]}
+    tag
+  end
 end
 
 desc "Make ChangeLog"