tests/heredoctest.py

util: move common proxyobserver attributes to the base class

Fixes the following pytype warnings:

    line 791, in _writedata: No attribute 'logdata' on baseproxyobserver [attribute-error]
    line 792, in _writedata: No attribute 'logdataapis' on baseproxyobserver [attribute-error]
    line 793, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 794, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 799, in _writedata: No attribute 'logdataapis' on baseproxyobserver [attribute-error]
    line 800, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 802, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 803, in _writedata: No attribute 'name' on baseproxyobserver [attribute-error]
    line 805, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 809, in _writedata: No attribute 'logdataapis' on baseproxyobserver [attribute-error]
    line 810, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 814, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 815, in _writedata: No attribute 'name' on baseproxyobserver [attribute-error]
    line 817, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]

Differential Revision: https://phab.mercurial-scm.org/D7675

from __future__ import absolute_import, print_function

import sys


def flush():
    sys.stdout.flush()
    sys.stderr.flush()


globalvars = {}
lines = sys.stdin.readlines()
while lines:
    l = lines.pop(0)
    if l.startswith('SALT'):
        print(l[:-1])
    elif l.startswith('>>> '):
        snippet = l[4:]
        while lines and lines[0].startswith('... '):
            l = lines.pop(0)
            snippet += l[4:]
        c = compile(snippet, '<heredoc>', 'single')
        try:
            flush()
            exec(c, globalvars)
            flush()
        except Exception as inst:
            flush()
            print(repr(inst))