# HG changeset patch
# User Sébastien Pierre <sebastien@xprima.com>
# Date 1148767480 25200
# Node ID 88c881bda88885f0f086ae3e91f931018168b3fb
# Parent  1772852d7d141a01d038a576c62883379d8ba972
darcs2hg.py: import darcs project into mercurial

For now, the tags are not taken into account (so you have to reenter
the tags by hand)

diff -r 1772852d7d14 -r 88c881bda888 contrib/darcs2hg.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/darcs2hg.py	Sat May 27 15:04:40 2006 -0700
@@ -0,0 +1,124 @@
+#!/usr/bin/env python
+# Encoding: iso-8859-1
+# vim: tw=80 ts=4 sw=4 noet
+# -----------------------------------------------------------------------------
+# Project   : Basic Darcs to Mercurial conversion script
+# -----------------------------------------------------------------------------
+# Author    : Sebastien Pierre <sebastien@xprima.com>
+# Creation  : 24-May-2006
+# Last mod  : 26-May-2006
+# History   :
+#             26-May-2006 - Updated
+#             24-May-2006 - First implementation
+# -----------------------------------------------------------------------------
+
+import os, sys
+import xml.dom.minidom as xml_dom
+
+DARCS_REPO = None
+HG_REPO    = None
+
+USAGE = """\
+%s DARCSREPO HGREPO
+
+    Converts the given Darcs repository to a new Mercurial repository. The given
+    HGREPO must not exist, as it will be created and filled up (this will avoid
+    overwriting valuable data.
+
+""" % (os.path.basename(__file__))
+
+# ------------------------------------------------------------------------------
+#
+# Utilities
+#
+# ------------------------------------------------------------------------------
+
+def cmd(text, path=None):
+	"""Executes a command, in the given directory (if any), and returns the
+	command result as a string."""
+	cwd = None
+	if path:
+		path = os.path.abspath(path)
+		cwd  = os.getcwd()
+		os.chdir(path)
+	print text
+	res = os.popen(text).read()
+	if path:
+		os.chdir(cwd)
+	return res
+
+def writefile(path, data):
+	"""Writes the given data into the given file."""
+	f = file(path, "w") ; f.write(data)  ; f.close()
+
+# ------------------------------------------------------------------------------
+#
+# Darcs interface
+#
+# ------------------------------------------------------------------------------
+
+def darcs_changes(darcsRepo):
+	"""Gets the changes list from the given darcs repository. This returns the
+	chronological list of changes as (change name, change summary)."""
+	changes    = cmd("darcs changes --reverse --xml-output", darcsRepo)
+	doc        = xml_dom.parseString(changes)
+	res        = []
+	for patch_node in doc.childNodes[0].childNodes:
+		name = filter(lambda n:n.nodeName == "name", patch_node.childNodes)
+		comm = filter(lambda n:n.nodeName == "comment", patch_node.childNodes)
+		if not name:continue
+		else: name = name[0].childNodes[0].data
+		if not comm: comm = ""
+		else: comm = comm[0].childNodes[0].data
+		res.append([name, comm])
+	return res
+
+def darcs_pull(hg_repo, darcs_repo, change):
+	cmd("darcs pull '%s' --all --patches='%s'" % (darcs_repo, change), hg_repo)
+
+# ------------------------------------------------------------------------------
+#
+# Mercurial interface
+#
+# ------------------------------------------------------------------------------
+
+def hg_commit( hg_repo, text ):
+	writefile("/tmp/msg", text)
+	cmd("hg add -X _darcs *", hg_repo)
+	cmd("hg commit -l /tmp/msg", hg_repo)
+	os.unlink("/tmp/msg")
+
+# ------------------------------------------------------------------------------
+#
+# Main
+#
+# ------------------------------------------------------------------------------
+
+if __name__ == "__main__":
+	args = sys.argv[1:]
+	# We parse the arguments
+	if len(args)   == 2:
+		darcs_repo = os.path.abspath(args[0])
+		hg_repo    = os.path.abspath(args[1])
+	else:
+		print USAGE
+		sys.exit(-1)
+	# Initializes the target repo
+	if not os.path.isdir(darcs_repo + "/_darcs"):
+		print "No darcs directory found at: " + darc_repo
+		sys.exit(-1)
+	if not os.path.isdir(hg_repo):
+		os.mkdir(hg_repo)
+	else:
+		print "Given HG repository must not exist. It will be created"
+		sys.exit(-1)
+	cmd("hg init '%s'" % (hg_repo))
+	cmd("darcs initialize", hg_repo)
+	# Get the changes from the Darcs repository
+	for summary, description in darcs_changes(darcs_repo):
+		text = summary + "\n" + description
+		darcs_pull(hg_repo, darcs_repo, summary)
+		hg_commit(hg_repo, text)
+
+# EOF
+