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#!/usr/bin/python
import difflib
import re
import sys
# Assume we only use the "== Section Name" section title syntax
sectionheader_re = re.compile(r'^==+\s(.*)\s*$')
# Assume we only use the "[[ItemName]]" anchor syntax
anchor_re = re.compile(r'^\[\[([^]]+)\]\]')
class Reader(object):
def __init__(self):
self.d = {}
# Initial state is to gather section headers
self.getline = self._getsec
self.section = None
def _getsec(self, line):
"""Read a section header
Prepare to gather anchors from subsequent lines. Don't change
state if the line isn't a section header.
"""
m = sectionheader_re.match(line)
if not m:
return
self.anchors = anchors = []
self.d[m.group(1)] = anchors
self.getline = self._getanchor
def _getanchor(self, line):
"""Read an anchor for an item definition
Append the anchor names to the list of items in the current
section.
"""
m = anchor_re.match(line)
if not m:
return self._getsec(line)
self.anchors.append(m.group(1))
def diffsort(self, key):
"""Unified diff of unsorted and sorted item lists
"""
# Append newlines because difflib works better with them
a = [s + '\n' for s in self.d[key]]
b = sorted(a, key=str.lower)
return difflib.unified_diff(a, b, fromfile=key+' unsorted',
tofile=key+' sorted')
def main():
"""Diff unsorted and sorted lists of option names in a manpage
Use the file named by the first argument, or standard input if
there is none.
"""
try:
fname = sys.argv[1]
f = open(fname, 'r')
except IndexError:
f = sys.stdin
reader = Reader()
for line in f:
reader.getline(line)
for key in sorted(reader.d.keys(), key=str.lower):
sys.stdout.writelines(reader.diffsort(key))
if __name__ == '__main__':
main()
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