view contrib/debugcmdserver.py @ 28266:de8b09482fb7

destutil: show message about other branch heads, even if on a closed head

Before this patch, bare "hg update" displays message below, if there
is at least one non-closed branch head other than current parent:

   1. 'XX other heads for branch "BRANCH"' message, if current parent is
      on a non-closed branch head

      This suggests user to invoke "hg heads" or so for merging them.

   2. no message, if current parent is on a closed branch head

      At this patch, bare "hg update" might choose closed branch head
      as update destination, and it causes this situation easily.

   3. no message, otherwise (= current parent isn't on any branch head)

'XX other heads for branch "BRANCH"' should be displayed also in #2
case above, because user might overlook other non-closed branch heads.

This patch gets a list of all branch heads regardless of closed-ness
of it, and uses it (= 'allheads') to distinguish #1/#2 from #3 above.

#!/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()