[NEW] Adding Bazaar support: add cat_file.rb adapter module with unit tests

Michael

Author: obnoxxx

lib/scm/adapters/bzr/cat_file.rb

@@ -0,0 +1,26 @@
+module Scm::Adapters
+	class BzrAdapter < AbstractAdapter
+		def cat_file(commit, diff)
+			cat(commit.token, diff.path)
+		end
+
+		def cat_file_parent(commit, diff)
+			p = parents(commit)
+			cat(p.first.token, diff.path) if p.first
+		end
+
+		def cat(revision, path)
+			out, err = run_with_err("cd '#{url}' && bzr cat -r #{revision} #{escape(path)}")
+			return nil if err =~ / is not present in revision /
+			raise RuntimeError.new(err) unless err.to_s == ''
+			out
+		end
+
+		# Escape bash-significant characters in the filename
+		# Example:
+		#     "Foo Bar & Baz" => "Foo\ Bar\ \&\ Baz"
+		def escape(path)
+			path.gsub(/[ '"&]/) { |c| '\\' + c }
+		end
+	end
+end

lib/scm/adapters/bzr_adapter.rb

@@ -9,3 +9,4 @@ def english_name
 require 'lib/scm/adapters/bzr/validation'
 require 'lib/scm/adapters/bzr/commits'
 require 'lib/scm/adapters/bzr/head'
+require 'lib/scm/adapters/bzr/cat_file'

test/unit/bzr_cat_file_test.rb

@@ -0,0 +1,43 @@
+require File.dirname(__FILE__) + '/../test_helper'
+
+module Scm::Adapters
+	class BzrCatFileTest < Scm::Test
+
+		def test_cat_file
+			with_bzr_repository('bzr') do |bzr|
+				expected = <<-EXPECTED
+first file
+second line
+EXPECTED
+				assert_equal expected,
+					bzr.cat_file(Scm::Commit::new(:token => 6),
+						     Scm::Diff.new(:path => "file1.txt"))
+
+				# file2.txt has been removed in commit #5
+				assert_equal nil, bzr.cat_file(bzr.head,
+							       Scm::Diff.new(:path => "file2.txt"))
+			end
+		end
+
+		def test_cat_file_parent
+			with_bzr_repository('bzr') do |bzr|
+				expected = <<-EXPECTED
+first file
+second line
+EXPECTED
+				assert_equal expected,
+					bzr.cat_file_parent(Scm::Commit::new(:token => 6),
+							    Scm::Diff.new(:path => "file1.txt"))
+
+				# file2.txt has been removed in commit #5
+				expected = <<-EXPECTED
+another file
+EXPECTED
+				assert_equal expected,
+					bzr.cat_file_parent(Scm::Commit.new(:token => 5),
+							    Scm::Diff.new(:path => "file2.txt"))
+			end
+		end
+
+	end
+end