tests/failfilemerge.py

scmutil: extend termwidth() to return terminal height, renamed to termsize()

It appears crecord.py has its own termsize() function. I want to get rid of it.

The fallback height is chosen from the default of cmd.exe on Windows, and
VT100 on Unix.

# extension to emulate interupting filemerge._filemerge

from __future__ import absolute_import

from mercurial import (
    error,
    extensions,
    filemerge,
)

def failfilemerge(filemergefn,
                  premerge, repo, mynode, orig, fcd, fco, fca, labels=None):
    raise error.Abort("^C")
    return filemergefn(premerge, repo, mynode, orig, fcd, fco, fca, labels)

def extsetup(ui):
    extensions.wrapfunction(filemerge, '_filemerge',
                            failfilemerge)