1 files changed, 171 insertions, 0 deletions
diff --git a/geneticone/flags.py b/geneticone/flags.py
new file mode 100644
index 0000000..df22185
--- /dev/null
+++ b/geneticone/flags.py
@@ -0,0 +1,171 @@
+#!/usr/bin/python
+
+#
+# File: geneticone/flags.py
+# This file is part of the Genetic/One-Project, a graphical portage-frontend.
+#
+# Copyright (C) 2006 Necoro d.M.
+# This is free software.  You may redistribute copies of it under the terms of
+# the GNU General Public License version 2.
+# There is NO WARRANTY, to the extent permitted by law.
+#
+# Written by Necoro d.M. <necoro@necoro.net>
+
+import os
+import os.path
+from subprocess import Popen, PIPE
+
+from geneticone import *
+
+### GENERAL PART ###
+
+def grep (p, path):
+	"""Grep runs "egrep" on a given path and looks for occurences of a given package."""
+	if not isinstance(p, Package):
+		p = Package(p) # assume it is a cpv or a gentoolkit.Package
+
+	command = "egrep -x -n -r -H '^[<>!=~]{0,2}%s(-[0-9].*)?[[:space:]].*$' %s"
+	return Popen((command % (p.get_cp(), path)), shell = True, stdout = PIPE).communicate()[0].splitlines()
+
+def get_data(pkg):
+	"""This splits up the data of grep() and builds tuples in the format (file,line,criterion,list_of_flags)."""
+	flags = []
+
+	# do grep
+	list = grep(pkg, USE_PATH)
+	
+	for i in range(len(list)):
+		file, line, fl = tuple(list[i].split(":")) # get file, line and flag-list
+		fl = fl.split()
+		crit = fl[0]
+		fl = fl[1:]
+		# stop after first comment
+		for i in range(len(fl)):
+			if fl[i][0] == "#": #comment - stop here
+				fl = fl[:i]
+				break
+		flags.append((file,line,crit,fl))
+
+	return flags
+
+### USE FLAG PART ###
+USE_PATH = os.path.join(portage.USER_CONFIG_PATH,"package.use.go")
+USE_PATH_IS_DIR = os.path.isdir(USE_PATH)
+useFlags = {} # useFlags in the file
+newUseFlags = [] # useFlags as we want them to be: format: (cpv, file, line, useflag, (true if removed from list / false if added))
+
+def set_use_flag (pkg, flag):
+	"""Sets the useflag for a given package."""
+	if not isinstance(pkg, Package):
+		pkg = Package(pkg) # assume cpv or gentoolkit.Package
+
+	cpv = pkg.get_cpv()
+	
+	# if not saved in useFlags, get it by calling get_data() which calls grep()
+	data = None
+	if not cpv in useFlags:
+		data = get_data(pkg)
+		useFlags[cpv] = data
+	else:
+		data = useFlags[cpv]
+
+	# add a useflag / delete one
+	added = False
+	for file, line, crit, flags in data:
+		if pkg.matches(crit):
+			# we have "-flag" and "flag" is in the uselist -> delete "flag"
+			if flag[0] == "-" and flag[1:] in flags:
+				if added: del newUseFlags[-1] # we currently added it as an extra option - delete it
+				added = True
+				newUseFlags.append((pkg.get_cpv(), file, line, flag[1:], True))
+				break
+			# we have "flag" and "-flag" is in the uselist -> delete "-flag"
+			elif flag[0] != "-" and "-"+flag in flags:
+				if added: del newUseFlags[-1] # we currently added it as an extra option - delete it
+				added = True
+				newUseFlags.append((pkg.get_cpv(), file, line, "-"+flag, True))
+				break
+			# add as an extra flag
+			else:
+				if not added: newUseFlags.append((pkg.get_cpv(), file, line, flag, False))
+				added = True
+	# create a new line
+	if not added:
+		if USE_PATH_IS_DIR:
+			newUseFlags.append((pkg.get_cpv(), os.path.join(USE_PATH,"geneticone"), -1, flag, False))
+		else:
+			newUseFlags.append((pkg.get_cpv(), USE_PATH, -1, flag, False))
+
+def write_use_flags ():
+	"""This writes our changed useflags into the file."""
+	global newUseFlags, useFlags
+
+	def insert (flag, list):
+		"""Shortcut for inserting a new flag right after the package-name."""
+		list.insert(1,flag)
+	
+	def remove (flag, list):
+		"""Removes a flag."""
+		try:
+			list.remove(flag)
+		except ValueError: # flag is given as flag\n
+			list.remove(flag+"\n")
+			list.append("\n") #re-insert the newline
+
+		# no more flags there - comment it out
+		if len(list) == 1 or list[1][0] in ("#","\n"):
+			list[0] = "#"+list[0]
+			insert("#removed by geneticone#",list)
+
+	file_cache = {} # cache for having to read the file only once: name->[lines]
+	for cpv, file, line, flag, delete in newUseFlags:
+		line = int(line) # it is saved as a string so far!
+		
+		# add new line
+		if line == -1:
+			msg = "\n#geneticone update#\n=%s %s" % (cpv, flag)
+			if not file in file_cache:
+				f = open(file, "a")
+				f.write(msg)
+				f.close()
+			else:
+				file_cache[file].append(msg)
+		# change a line
+		else:
+			if not file in file_cache:
+				# read file
+				f = open(file, "r")
+				lines = []
+				i = 1
+				while i < line: # stop at the given line
+					lines.append(f.readline())
+					i = i+1
+				l = f.readline().split(" ")
+				# delete or insert
+				if delete:
+					remove(flag,l)
+				else:
+					insert(flag,l)
+				lines.append(" ".join(l))
+				
+				# read the rest
+				lines.extend(f.readlines())
+				
+				file_cache[file] = lines
+				f.close()
+			else: # in cache
+				l = file_cache[file][line-1].split(" ")
+				if delete:
+					remove(flag,l)
+				else:
+					insert(flag,l)
+				file_cache[file][line-1] = " ".join(l)
+	
+	# write to disk
+	for file in file_cache.keys():
+		f = open(file, "w")
+		f.writelines(file_cache[file])
+		f.close()
+	# reset
+	useFlags = {}
+	newUseFlags = []