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