From 890420b2c3454bbe0638df1809647f18d4072e81 Mon Sep 17 00:00:00 2001
From: Saivann <saivann@gmail.com>
Date: Sun, 18 May 2014 11:38:50 -0400
Subject: [PATCH] Add comparelinks.rb script in _contrib

---
 _contrib/comparelinks.rb | 94 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 _contrib/comparelinks.rb

diff --git a/_contrib/comparelinks.rb b/_contrib/comparelinks.rb
new file mode 100644
index 00000000..8e3b246b
--- /dev/null
+++ b/_contrib/comparelinks.rb
@@ -0,0 +1,94 @@
+## This script is used to compare all links between two branches of the
+## website. Each branches are built and compared.
+
+## Example: ruby ./_contrib/comparelinks.rb master newbranch > ../diff
+
+WORKDIR = `mktemp -d`
+WORKDIR.gsub!("\n",'')
+
+at_exit {
+	`rm -fr "#{WORKDIR}"`
+}
+
+def prompt(*args)
+    print(*args)
+    gets
+end
+
+if !ARGV.empty? && !ARGV[0].empty? && !ARGV[1].empty?
+  srcbr = ARGV[0]
+  dstbr = ARGV[1]
+else
+  print "Usage: comparelinks.rb oldbranch newbranch \n"
+  exit
+end
+
+if !File.exist?('_config.yml')
+  print "Wrong working directory. \n"
+  exit
+end
+
+def fetchlinks()
+
+	# Fetch new list of links
+	links = {}
+	dirs = Dir.glob(WORKDIR + "/_site/**/*.html").each { |file| 
+		content = File.read(file)
+		content.scan(/ href *= *"(.*?)"/).each { |link|
+			link = link[0].to_s.gsub(/^(https?:\/\/(www\.)?bitcoin\.org)?\//,'/')
+			next if (link.match(/^#|^http:\/\/www.meetup.com\//))
+			if(!link.match(/^https?:\/\/|^\/[^\/]|^mailto:/))
+				link = File.dirname(file.sub(WORKDIR + '/_site','')) + '/' + File.basename(link)
+			end
+			links[link] = "0"
+		}
+		content.scan(/ src *= *"(.*?)"/).each { |link|
+			link = link[0].to_s.gsub(/^(https?:\/\/(www\.)?bitcoin\.org)?\//,'/')
+			links[link] = "0"
+		}
+	}
+
+	return links
+
+end
+
+# Copy current repository to a temporary directory
+`rsync -a ./ "#{WORKDIR}/"`
+
+# Build both version of the website and fetch all links
+oldlinks = {}
+newlinks = {}
+
+Dir.chdir(WORKDIR) do
+
+	`git checkout #{srcbr}`
+	`jekyll`
+	oldlinks = fetchlinks()
+
+	`git checkout #{dstbr}`
+	`jekyll`
+	newlinks = fetchlinks()
+
+end
+
+# Find added links, removed links
+diffaddlinks = []
+diffrmlinks = []
+newlinks.each { |link, etag|
+	next if oldlinks.has_key?(link)
+	diffaddlinks.push(link)
+}
+oldlinks.each { |link, etag|
+	next if newlinks.has_key?(link)
+	diffrmlinks.push(link)
+}
+
+# Display resulting diff
+diff = ''
+if diffaddlinks.length > 0
+	diff = diff + "## links added\n\n" + diffaddlinks.join("\n") + "\n\n"
+end
+if diffrmlinks.length > 0
+	diff = diff + "## links removed\n\n" + diffrmlinks.join("\n") + "\n\n"
+end
+print diff