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#!/usr/bin/python3
#
# section-parse.py: scan standard input and do the following:
#
# 1. look for a section that begins with "test-text "STUFF/foo" and ends
# with a blank line.
# 2. print the "bar.DIGITS" suffix for each line in the section
#
# Example:
#
# > cat input.txt
# test-text "blah blah blah garbage/foo"
# random crap bar.1
# random crap bar.2
# random crap bar.3
# random crap bar.4
#
# test-text "blah blah blah garbage/apple"
# random crap bar.1
# random crap bar.2
# random crap bar.3
# random crap bar.4
#
# ... (more stuff omitted for brevity) ...
# > ./section-parse.py < input.txt
# bar.1
# bar.2
# bar.3
# bar.4
#
# load libraries
import re, sys
# regex to match section header line
# (e.g. a line that looks like this: test-text "GARBAGE/foo"
HEAD = re.compile('test-text ".*/foo"')
# regex to match section footer
# (e.g. a blank line or line containing only spaces)
FOOT = re.compile('^\s*$')
# regex to match "bar.DIGITS" suffix on body lines
# (used
BODY = re.compile('^.*(bar\.\d+)$')
# parsing state: are we in the body of the relevant section?
in_body = False
# read lines from standard input
for line in sys.stdin.readlines():
# strip trailing newline
line = line.strip()
if (not in_body and HEAD.match(line)) or (in_body and FOOT.match(line)):
# line is section header or footer, toggle state
in_body = not in_body
elif in_body:
# in section body, match and print "bar.DIGITS" suffix
print(BODY.sub('\\1', line))
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