hg

rust-index: return variables systematic naming convention

To help knowing at a glance when a method is ready, making
us more comofortable when we are close to the final removal of
scaffolding, we introduce the systematic variable names `rust_res` and
`c_res`. The goal of this series is to always return the formet.

We take again the case of `pack_header` as example.

Our personal opinion is to usually avoid such poor semantics as `res`, but
usually accept it when it close to the actual return, which will be the
case in most methods of this series. Also, the name can simply be dropped
when we remove the scaffolding. To follow on the example, the body of
`pack_header()` should become this in the final version:

```
    let index = self.index(py).borrow();
    let packed = index.pack_header(args.get_item(py, 0).extract(py)?);
    Ok(PyBytes::new(py, &packed).into_object());
```

in these cases it is close to the actual return and will be removed
at the end entirely.

#!/usr/bin/env python3
#
# mercurial - scalable distributed SCM
#
# Copyright 2005-2007 Olivia Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import os
import sys

libdir = '@LIBDIR@'

if libdir != '@' 'LIBDIR' '@':
    if not os.path.isabs(libdir):
        libdir = os.path.join(
            os.path.dirname(os.path.realpath(__file__)), libdir
        )
        libdir = os.path.abspath(libdir)
    sys.path.insert(0, libdir)

# Make `pip install --user ...` packages available to the official Windows
# build.  Most py2 packaging installs directly into the system python
# environment, so no changes are necessary for other platforms.  The Windows
# py2 package uses py2exe, which lacks a `site` module.  Hardcode it according
# to the documentation.
if getattr(sys, 'frozen', None) == 'console_exe':
    vi = sys.version_info
    appdata = os.environ.get('APPDATA')
    if appdata:
        sys.path.append(
            os.path.join(
                appdata,
                'Python',
                'Python%d%d' % (vi[0], vi[1]),
                'site-packages',
            )
        )

try:
    from hgdemandimport import tracing
except ImportError:
    sys.stderr.write(
        "abort: couldn't find mercurial libraries in [%s]\n"
        % ' '.join(sys.path)
    )
    sys.stderr.write("(check your install and PYTHONPATH)\n")
    sys.exit(-1)

with tracing.log('hg script'):
    # enable importing on demand to reduce startup time
    import hgdemandimport

    hgdemandimport.enable()

    from mercurial import dispatch

    dispatch.run()