"""Export command
"""

__copyright__ = """
Copyright (C) 2005, Catalin Marinas <catalin.marinas@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""

import os
import sys
from stgit.argparse import opt
from stgit.commands import common
from stgit import argparse, git, templates
from stgit.out import out
from stgit.lib import git as gitlib

help = 'Export patches to a directory'
kind = 'patch'
usage = ['[options] [<patch1>] [<patch2>] [<patch3>..<patch4>]']
description = """
Export a range of applied patches to a given directory (defaults to
'patches-<branch>') in a standard unified GNU diff format. A template
file (defaulting to '.git/patchexport.tmpl' or
'~/.stgit/templates/patchexport.tmpl' or
'/usr/share/stgit/templates/patchexport.tmpl') can be used for the
patch format. The following variables are supported in the template
file:

  %(description)s - patch description
  %(shortdescr)s  - the first line of the patch description
  %(longdescr)s   - the rest of the patch description, after the first line
  %(diffstat)s    - the diff statistics
  %(authname)s    - author's name
  %(authemail)s   - author's e-mail
  %(authdate)s    - patch creation date
  %(commname)s    - committer's name
  %(commemail)s   - committer's e-mail"""

args = [argparse.patch_range(argparse.applied_patches,
                             argparse.unapplied_patches,
                             argparse.hidden_patches)]
options = [
    opt('-d', '--dir', args = [argparse.dir],
        short = 'Export patches to DIR instead of the default'),
    opt('-p', '--patch', action = 'store_true',
        short = 'Append .patch to the patch names'),
    opt('-e', '--extension',
        short = 'Append .EXTENSION to the patch names'),
    opt('-n', '--numbered', action = 'store_true',
        short = 'Prefix the patch names with order numbers'),
    opt('-t', '--template', metavar = 'FILE', args = [argparse.files],
        short = 'Use FILE as a template'),
    opt('-b', '--branch', args = [argparse.stg_branches],
        short = 'Use BRANCH instead of the default branch'),
    opt('-s', '--stdout', action = 'store_true',
        short = 'Dump the patches to the standard output'),
    ] + argparse.diff_opts_option()

directory = common.DirectoryHasRepositoryLib()

def func(parser, options, args):
    """Export a range of patches.
    """
    stack = directory.repository.get_stack(options.branch)

    if options.dir:
        dirname = options.dir
    else:
        dirname = 'patches-%s' % stack.name
        directory.cd_to_topdir()

    if not options.branch and git.local_changes():
        out.warn('Local changes in the tree;'
                 ' you might want to commit them first')

    if not options.stdout:
        if not os.path.isdir(dirname):
            os.makedirs(dirname)
        series = file(os.path.join(dirname, 'series'), 'w+')

    applied = stack.patchorder.applied
    unapplied = stack.patchorder.unapplied
    if len(args) != 0:
        patches = common.parse_patches(args, applied + unapplied, len(applied))
    else:
        patches = applied

    num = len(patches)
    if num == 0:
        raise common.CmdException, 'No patches applied'

    zpadding = len(str(num))
    if zpadding < 2:
        zpadding = 2

    # get the template
    if options.template:
        tmpl = file(options.template).read()
    else:
        tmpl = templates.get_template('patchexport.tmpl')
        if not tmpl:
            tmpl = ''

    # note the base commit for this series
    if not options.stdout:
        base_commit = stack.patches.get(patches[0]).commit.sha1
        print >> series, '# This series applies on GIT commit %s' % base_commit

    patch_no = 1;
    for p in patches:
        pname = p
        if options.patch:
            pname = '%s.patch' % pname
        elif options.extension:
            pname = '%s.%s' % (pname, options.extension)
        if options.numbered:
            pname = '%s-%s' % (str(patch_no).zfill(zpadding), pname)
        pfile = os.path.join(dirname, pname)
        if not options.stdout:
            print >> series, pname

        # get the patch description
        patch = stack.patches.get(p)
        cd = patch.commit.data

        descr = cd.message.strip()
        descr_lines = descr.split('\n')

        short_descr = descr_lines[0].rstrip()
        long_descr = reduce(lambda x, y: x + '\n' + y,
                            descr_lines[1:], '').strip()

        diff = stack.repository.diff_tree(cd.parent.data.tree, cd.tree, options.diff_flags)

        tmpl_dict = {'description': descr,
                     'shortdescr': short_descr,
                     'longdescr': long_descr,
                     'diffstat': gitlib.diffstat(diff).rstrip(),
                     'authname': cd.author.name,
                     'authemail': cd.author.email,
                     'authdate': cd.author.date.isoformat(),
                     'commname': cd.committer.name,
                     'commemail': cd.committer.email}
        for key in tmpl_dict:
            if not tmpl_dict[key]:
                tmpl_dict[key] = ''

        try:
            descr = tmpl % tmpl_dict
        except KeyError, err:
            raise common.CmdException, 'Unknown patch template variable: %s' \
                  % err
        except TypeError:
            raise common.CmdException, 'Only "%(name)s" variables are ' \
                  'supported in the patch template'

        if options.stdout:
            f = sys.stdout
        else:
            f = open(pfile, 'w+')

        if options.stdout and num > 1:
            print '-'*79
            print patch.name
            print '-'*79

        f.write(descr)
        f.write(diff)
        if not options.stdout:
            f.close()
        patch_no += 1

    if not options.stdout:
        series.close()