contrib/debugcmdserver.py

tests: add coverage to ensure Wix tracks 'help' and 'templates' files

This would have caught the problem fixed by 65d2538ac993. There are
other *.wxs files that can be checked, but they appear to be more
complicated. For example, locale.wxs has what appears to be foreach
loop support, as well as variable substitution.

By checking `hg files` to determine tracked file, this is able to avoid false
failures when other junk is present in the filesystem, like *.orig files.

I can't tell if the map-cmdline.status file is not included on purpose, but I
don't see the purpose of excluding it.  The missing help files seem reasonable
for Windows.

#!/usr/bin/env python
#
# Dumps output generated by Mercurial's command server in a formatted style to a
# given file or stderr if '-' is specified. Output is also written in its raw
# format to stdout.
#
# $ ./hg serve --cmds pipe | ./contrib/debugcmdserver.py -
# o, 52   -> 'capabilities: getencoding runcommand\nencoding: UTF-8'

import sys, struct

if len(sys.argv) != 2:
    print 'usage: debugcmdserver.py FILE'
    sys.exit(1)

outputfmt = '>cI'
outputfmtsize = struct.calcsize(outputfmt)

if sys.argv[1] == '-':
    log = sys.stderr
else:
    log = open(sys.argv[1], 'a')

def read(size):
    data = sys.stdin.read(size)
    if not data:
        raise EOFError
    sys.stdout.write(data)
    sys.stdout.flush()
    return data

try:
    while True:
        header = read(outputfmtsize)
        channel, length = struct.unpack(outputfmt, header)
        log.write('%s, %-4d' % (channel, length))
        if channel in 'IL':
            log.write(' -> waiting for input\n')
        else:
            data = read(length)
            log.write(' -> %r\n' % data)
        log.flush()
except EOFError:
    pass
finally:
    if log != sys.stderr:
        log.close()