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#! /usr/bin/env python3
"""Create a TAGS file for Python programs, usable with GNU Emacs.
usage: eptags pyfiles...
The output TAGS file is usable with Emacs version 18, 19, 20.
Tagged are:
- functions (even inside other defs or classes)
- classes
eptags warns about files it cannot open.
eptags will not give warnings about duplicate tags.
BUGS:
Because of tag duplication (methods with the same name in different
classes), TAGS files are not very useful for most object-oriented
python projects.
"""
import sys,re
expr = r'^[ \t]*(def|class)[ \t]+([a-zA-Z_][a-zA-Z0-9_]*)[ \t]*[:\(]'
matcher = re.compile(expr)
def treat_file(filename, outfp):
"""Append tags found in file named 'filename' to the open file 'outfp'"""
try:
fp = open(filename, 'r')
except OSError:
sys.stderr.write('Cannot open %s\n'%filename)
return
with fp:
charno = 0
lineno = 0
tags = []
size = 0
while 1:
line = fp.readline()
if not line:
break
lineno = lineno + 1
m = matcher.search(line)
if m:
tag = m.group(0) + '\177%d,%d\n' % (lineno, charno)
tags.append(tag)
size = size + len(tag)
charno = charno + len(line)
outfp.write('\f\n%s,%d\n' % (filename,size))
for tag in tags:
outfp.write(tag)
def main():
with open('TAGS', 'w') as outfp:
for filename in sys.argv[1:]:
treat_file(filename, outfp)
if __name__=="__main__":
main()
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