# commands.py - command processing for mercurial

#

# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms

# of the GNU General Public License, incorporated herein by reference.

from demandload import demandload

from node import *

from i18n import gettext as _

demandload(globals(), 'os sys')

def make_filename(repo, pat, node,

                  total=None, seqno=None, revwidth=None, pathname=None):

    node_expander = {

        'H': lambda: hex(node),

        'R': lambda: str(repo.changelog.rev(node)),

        'h': lambda: short(node),

        }

    expander = {

        '%': lambda: '%',

        'b': lambda: os.path.basename(repo.root),

        }

    try:

        if node:

            expander.update(node_expander)

        if node and revwidth is not None:

            expander['r'] = (lambda:

                    str(repo.changelog.rev(node)).zfill(revwidth))

        if total is not None:

            expander['N'] = lambda: str(total)

        if seqno is not None:

            expander['n'] = lambda: str(seqno)

        if total is not None and seqno is not None:

            expander['n'] = lambda:str(seqno).zfill(len(str(total)))

        if pathname is not None:

            expander['s'] = lambda: os.path.basename(pathname)

            expander['d'] = lambda: os.path.dirname(pathname) or '.'

            expander['p'] = lambda: pathname

        newname = []

        patlen = len(pat)

        i = 0

        while i < patlen:

            c = pat[i]

            if c == '%':

                i += 1

                c = pat[i]

                c = expander[c]()

            newname.append(c)

            i += 1

        return ''.join(newname)

    except KeyError, inst:

        raise util.Abort(_("invalid format spec '%%%s' in output file name"),

                    inst.args[0])

def make_file(repo, pat, node=None,

              total=None, seqno=None, revwidth=None, mode='wb', pathname=None):

    if not pat or pat == '-':

        return 'w' in mode and sys.stdout or sys.stdin

    if hasattr(pat, 'write') and 'w' in mode:

        return pat

    if hasattr(pat, 'read') and 'r' in mode:

        return pat

    return open(make_filename(repo, pat, node, total, seqno, revwidth,

                              pathname),

                mode)