Add support for prerelease tags

Add a new regex entry in the config for prerelease tags

Process prerelease and release tags separately and mark them
appropriately in the API

Signed-off-by: Doug Ledford <dledford@redhat.com>

Author: dledford

README.md

@@ -78,3 +78,8 @@ differently.  None of them should be required for normal, sane use.
    you might have decided to make.  Only tags which match this regular
    expression will be pushed up by `git release`, and only those tags will
    be marked as releases.
+
+ * `release.pre-regex` (default `v\d+\.\d+(\.\d+)?(-rc\d+.*){1}$`) -- The
+   regular expression to filter which tages denote prereleases.  Only tags
+   which match this regular expression will be pushed up by `git release`,
+   and these will be marked as Pre-release on the github release pages.

lib/github-release.rb

@@ -3,13 +3,21 @@
 
 class GithubRelease
 	def run
+		new_prereleases = tagged_prereleases.select { |p| !github_releases.include?(p) }
+
+		if new_prereleases.empty?
+			puts "No new pre-release tags to push."
+		end
+
+		new_prereleases.each { |t| create_release(t, true) }
+
 		new_releases = tagged_releases.select { |r| !github_releases.include?(r) }
 
 		if new_releases.empty?
 			puts "No new release tags to push."
 		end
 
-		new_releases.each { |t| create_release(t) }
+		new_releases.each { |t| create_release(t, false) }
 
 		puts "All done!"
 	end
@@ -52,6 +60,12 @@ def get_new_token
 		log_val(token)
 	end
 
+	def pre_regex
+		@pre_regex ||= `git config --get release.pre-regex`.strip
+		@pre_regex = /^v\d+\.\d+(\.\d+)?(-rc\d+.*){1}$/ if @pre_regex.empty?
+		log_val(@pre_regex)
+	end
+
 	def tag_regex
 		@tag_regex ||= `git config --get release.tag-regex`.strip
 		@tag_regex = /^v\d+\.\d+(\.\d+)?$/ if @tag_regex.empty?
@@ -63,6 +77,11 @@ def tagged_releases
 		log_val(@tagged_releases)
 	end
 
+	def tagged_prereleases
+		@tagged_prereleases ||= `git tag`.split("\n").map(&:strip).grep pre_regex
+		log_val(@tagged_prereleases)
+	end
+
 	def repo_name
 		@repo_name ||= begin
 			case repo_url
@@ -106,7 +125,7 @@ def git_config(item, default = nil)
 		log_val(@config_cache[item], item)
 	end
 
-	def create_release(tag)
+	def create_release(tag, prerelease)
 		puts "Pushing to #{remote_name}..."
 		system("git push #{remote_name} tag #{tag}")
 
@@ -118,7 +137,7 @@ def create_release(tag)
 		name = name.gsub(/^#{tag}/, '').strip
 		body = body.split("\n").map { |l| l.sub(/^    /, '') }.join("\n")
 
-		api.create_release(repo_name, tag, :name => name, :body => body)
+		api.create_release(repo_name, tag, :name => name, :body => body, :prerelease => prerelease)
 
 		puts " done!"
 	end