contrib/debugcmdserver.py
author Raphaël Gomès <rgomes@octobus.net>
Tue, 07 Nov 2023 16:07:53 +0100
branchstable
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parent 48875 6000f5b25c9b
permissions -rwxr-xr-x
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#!/usr/bin/env python3
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#
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# Dumps output generated by Mercurial's command server in a formatted style to a
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# given file or stderr if '-' is specified. Output is also written in its raw
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# format to stdout.
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#
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# $ ./hg serve --cmds pipe | ./contrib/debugcmdserver.py -
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# o, 52   -> 'capabilities: getencoding runcommand\nencoding: UTF-8'
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import struct
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import sys
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if len(sys.argv) != 2:
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    print('usage: debugcmdserver.py FILE')
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    sys.exit(1)
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outputfmt = '>cI'
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outputfmtsize = struct.calcsize(outputfmt)
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if sys.argv[1] == '-':
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    log = sys.stderr
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else:
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    log = open(sys.argv[1], 'a')
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def read(size):
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    data = sys.stdin.read(size)
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    if not data:
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        raise EOFError
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    sys.stdout.write(data)
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    sys.stdout.flush()
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    return data
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try:
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    while True:
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        header = read(outputfmtsize)
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        channel, length = struct.unpack(outputfmt, header)
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        log.write('%s, %-4d' % (channel, length))
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        if channel in 'IL':
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            log.write(' -> waiting for input\n')
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        else:
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            data = read(length)
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            log.write(' -> %r\n' % data)
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        log.flush()
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except EOFError:
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    pass
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finally:
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    if log != sys.stderr:
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        log.close()