contrib/debugshell.py

run-tests: include quotes in the HGEDITOR value when storing sys.executable

This fixes test-install.t on Windows that broke in 2122b82b6987 when
shlex.split() was added to the debuginstall command:

    @@ -7,8 +7,11 @@
       checking installed modules (*mercurial)... (glob)
       checking templates (*mercurial?templates)... (glob)
       checking commit editor...
    +   Can't find editor 'c:\Python27\python.exe -c "(omitted)"' in PATH
    +   (specify a commit editor in your configuration file)
       checking username...
    -  no problems detected
    +  1 problems detected, please check your install!
    +  [1]

What happens is that shlex.split() on Windows turns this:

    c:\Python27\python.exe -c "import sys; sys.exit(0)"

into this:

    ['c:Python27python.exe', '-c', 'import sys; sys.exit(0)']

While technically a regression, most programs on Windows live in some flavor of
'Program Files', and therefore the environment variable needs to contain quotes
anyway to handle the space.  This wasn't handled prior to the shlex() change,
because it tested the whole environment variable to see if it was an executable,
or split on the first space and tested again.

# debugshell extension
"""a python shell with repo, changelog & manifest objects"""

import sys
import mercurial
import code
from mercurial import cmdutil

cmdtable = {}
command = cmdutil.command(cmdtable)

def pdb(ui, repo, msg, **opts):
    objects = {
        'mercurial': mercurial,
        'repo': repo,
        'cl': repo.changelog,
        'mf': repo.manifest,
    }

    code.interact(msg, local=objects)

def ipdb(ui, repo, msg, **opts):
    import IPython

    cl = repo.changelog
    mf = repo.manifest
    cl, mf # use variables to appease pyflakes

    IPython.embed()

@command('debugshell|dbsh', [])
def debugshell(ui, repo, **opts):
    bannermsg = "loaded repo : %s\n" \
                "using source: %s" % (repo.root,
                                      mercurial.__path__[0])

    pdbmap = {
        'pdb'  : 'code',
        'ipdb' : 'IPython'
    }

    debugger = ui.config("ui", "debugger")
    if not debugger:
        debugger = 'pdb'

    # if IPython doesn't exist, fallback to code.interact
    try:
        __import__(pdbmap[debugger])
    except ImportError:
        ui.warn("%s debugger specified but %s module was not found\n"
                % (debugger, pdbmap[debugger]))
        debugger = 'pdb'

    getattr(sys.modules[__name__], debugger)(ui, repo, bannermsg, **opts)