Update powerline-release script to use live ebuild as the base

Reasoning: I am going to add man pages support to the live ebuild, but it does 
not make sense to add this to the 1.0 ebuild previously used as the base. Since 
new features will likely continue to appear in the live ebuild powerline-release 
script was modified to do the right thing under new circumstances.

scripts/powerline-release.py

@@ -5,7 +5,7 @@ from __future__ import (unicode_literals, division, absolute_import, print_funct
 import argparse
 import codecs
 import os
-import shutil
+import re
 
 from subprocess import check_output, check_call
 from getpass import getpass
@@ -107,9 +107,41 @@ def create_ebuilds(version_string, overlay, user, **kwargs):
 		('app-vim', 'powerline-vim'),
 	):
 		pdir = os.path.join(overlay, category, pn)
-		v1_0 = os.path.join(pdir, '{0}-1.0.ebuild'.format(pn))
+		live_ebuild = None
+		for ebuild in os.listdir(pdir):
+			if ebuild.endswith('.ebuild') and '9999' in ebuild:
+				live_ebuild = os.path.join(pdir, ebuild)
+				break
+		assert(live_ebuild)
 		vcur = os.path.join(pdir, '{0}-{1}.ebuild'.format(pn, version_string))
-		shutil.copy2(v1_0, vcur)
+		with open(live_ebuild) as LEF:
+			with open(vcur, 'w') as F:
+				dropnext = False
+				for line in LEF:
+					if line.startswith('EGIT'):
+						# Drop all EGIT_… and the next empty line
+						dropnext = True
+						next_re = re.compile('^$')
+						continue
+					if dropnext:
+						assert(next_re.match(line))
+						dropnext = False
+						continue
+					if line.startswith('# Note the lack of an assignment to ${S}'):
+						next_re = re.compile('^#')
+						dropnext = True
+						line = 'S="${WORKDIR}/${MY_P}"\n'
+					if line.startswith('inherit'):
+						line = line.replace(' git-r3', '')
+						line += '\n'
+						line += 'MY_PN="powerline-status"\n'
+						line += 'MY_P="${MY_PN}-${PV}"'
+						line += '\n'
+					elif line.startswith('HOMEPAGE'):
+						line += 'SRC_URI="mirror://pypi/p/${MY_PN}/${MY_P}.tar.gz"\n'
+					elif line.startswith('KEYWORDS'):
+						line = 'KEYWORDS="~amd64 ~ppc ~x86 ~x86-fbsd"\n'
+					F.write(line)
 		new_files.append(vcur)
 		check_call(['ebuild', vcur, 'manifest'])
 		new_files.append(os.path.join(pdir, 'Manifest'))