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#!/usr/bin/env python
"""
Greps and returns the first svn log entry containing a line matching the regular
expression pattern passed as the only arg.
Example:
svn log -v | grep-svn-log.py '^ D.+why_are_you_missing.h$'
"""
import fileinput
import re
import sys
import StringIO
# Separator string for "svn log -v" output.
separator = '-' * 72
usage = """Usage: grep-svn-log.py line-pattern
Example:
svn log -v | grep-svn-log.py '^ D.+why_are_you_missing.h'"""
class Log(StringIO.StringIO):
"""Simple facade to keep track of the log content."""
def __init__(self):
self.reset()
def add_line(self, a_line):
"""Add a line to the content, if there is a previous line, commit it."""
global separator
if self.prev_line is not None:
print >> self, self.prev_line
self.prev_line = a_line
self.separator_added = (a_line == separator)
def del_line(self):
"""Forget about the previous line, do not commit it."""
self.prev_line = None
def reset(self):
"""Forget about the previous lines entered."""
StringIO.StringIO.__init__(self)
self.prev_line = None
def finish(self):
"""Call this when you're finished with populating content."""
if self.prev_line is not None:
print >> self, self.prev_line
self.prev_line = None
def grep(regexp):
# The log content to be written out once a match is found.
log = Log()
LOOKING_FOR_MATCH = 0
FOUND_LINE_MATCH = 1
state = LOOKING_FOR_MATCH
while True:
line = sys.stdin.readline()
if not line:
return
line = line.splitlines()[0]
if state == FOUND_LINE_MATCH:
# At this state, we keep on accumulating lines until the separator
# is encountered. At which point, we can return the log content.
if line == separator:
log.finish()
print log.getvalue()
return
log.add_line(line)
elif state == LOOKING_FOR_MATCH:
if line == separator:
log.reset()
log.add_line(line)
# Update next state if necessary.
if regexp.search(line):
state = FOUND_LINE_MATCH
def main():
if len(sys.argv) != 2:
print usage
sys.exit(0)
regexp = re.compile(sys.argv[1])
grep(regexp)
sys.stdin.close()
if __name__ == '__main__':
main()
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