vcs.rb: split

* tool/vcs.rb: split from file2lastrev.rb.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43609 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 102 insertions, 0 deletions

diff --git a/tool/vcs.rb b/tool/vcs.rb
new file mode 100644
index 0000000000..e7cb610767
--- /dev/null
+++ b/tool/vcs.rb
@@ -0,0 +1,102 @@
+# vcs
+
+ENV.delete('PWD')
+
+unless File.respond_to? :realpath
+  require 'pathname'
+  def File.realpath(arg)
+    Pathname(arg).realpath.to_s
+  end
+end
+
+class VCS
+  class NotFoundError < RuntimeError; end
+
+  @@dirs = []
+  def self.register(dir)
+    @@dirs << [dir, self]
+  end
+
+  def self.detect(path)
+    @@dirs.each do |dir, klass|
+      return klass.new(path) if File.directory?(File.join(path, dir))
+      prev = path
+      loop {
+        curr = File.realpath(File.join(prev, '..'))
+        break if curr == prev	# stop at the root directory
+        return klass.new(path) if File.directory?(File.join(curr, dir))
+        prev = curr
+      }
+    end
+    raise VCS::NotFoundError, "does not seem to be under a vcs: #{path}"
+  end
+
+  def initialize(path)
+    @srcdir = path
+    super()
+  end
+
+  # return a pair of strings, the last revision and the last revision in which
+  # +path+ was modified.
+  def get_revisions(path)
+    path = relative_to(path)
+    last, changed, *rest = Dir.chdir(@srcdir) {self.class.get_revisions(path)}
+    last or raise "last revision not found"
+    changed or raise "changed revision not found"
+    return last, changed, *rest
+  end
+
+  def relative_to(path)
+    if path
+      srcdir = File.realpath(@srcdir)
+      path = File.realpath(path)
+      list1 = srcdir.split(%r{/})
+      list2 = path.split(%r{/})
+      while !list1.empty? && !list2.empty? && list1.first == list2.first
+        list1.shift
+        list2.shift
+      end
+      if list1.empty? && list2.empty?
+        "."
+      else
+        ([".."] * list1.length + list2).join("/")
+      end
+    else
+      '.'
+    end
+  end
+
+  class SVN < self
+    register(".svn")
+
+    def self.get_revisions(path)
+      begin
+        nulldevice = %w[/dev/null NUL NIL: NL:].find {|dev| File.exist?(dev)}
+        if nulldevice
+          save_stderr = STDERR.dup
+          STDERR.reopen nulldevice, 'w'
+        end
+        info_xml = `svn info --xml "#{path}"`
+      ensure
+        if save_stderr
+          STDERR.reopen save_stderr
+          save_stderr.close
+        end
+      end
+      _, last, _, changed, _ = info_xml.split(/revision="(\d+)"/)
+      [last, changed]
+    end
+  end
+
+  class GIT < self
+    register(".git")
+
+    def self.get_revisions(path)
+      logcmd = %Q[git log -n1 --grep="^ *git-svn-id: .*@[0-9][0-9]* "]
+      idpat = /git-svn-id: .*?@(\d+) \S+\Z/
+      last = `#{logcmd}`[idpat, 1]
+      changed = path ? `#{logcmd} "#{path}"`[idpat, 1] : last
+      [last, changed]
+    end
+  end
+end