lorax/src/pylorax/ltmpl.py

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#
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# ltmpl.py
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#
# Copyright (C) 2009 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Red Hat Author(s): Martin Gracik <mgracik@redhat.com>
#
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import sys
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import shlex
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from mako.template import Template
from mako.lookup import TemplateLookup
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from mako.exceptions import RichTraceback
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class LoraxTemplate(object):
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def parse(self, template_file, variables):
# we have to set the template lookup directories to ["/"],
# otherwise the file includes will not work properly
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lookup = TemplateLookup(directories=["/"])
template = Template(filename=template_file, lookup=lookup)
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try:
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textbuf = template.render(**variables)
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except:
traceback = RichTraceback()
for (filename, lineno, function, line) in traceback.traceback:
print "File %s, line %s, in %s" % (filename, lineno, function)
print line
sys.exit(2)
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# split, strip and remove empty lines
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lines = textbuf.splitlines()
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lines = map(lambda line: line.strip(), lines)
lines = filter(lambda line: line, lines)
# mako template now returns unicode strings
lines = map(lambda line: line.encode("ascii"), lines)
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# split with shlex
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lines = map(shlex.split, lines)
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self.lines = lines
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return lines
def getdata(self, cmd, mode="tokens"):
'''returns a generator that yields every token on every line starting
with 'cmd'. if mode is "lines", you get a list for each line instead.'''
if mode == "lines":
return (f[1:] for f in self.lines if f[0]==cmd)
else:
return (i for f in self.lines if f[0]==cmd for i in f[1:])