# templatekw.py - common changeset template keywords

#

# Copyright 2005-2009 Matt Mackall <mpm@selenic.com>

#

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

# GNU General Public License version 2, incorporated herein by reference.

def showlist(templ, name, values, plural=None, **args):

    '''expand set of values.

    name is name of key in template map.

    values is list of strings or dicts.

    plural is plural of name, if not simply name + 's'.

    expansion works like this, given name 'foo'.

    if values is empty, expand 'no_foos'.

    if 'foo' not in template map, return values as a string,

    joined by space.

    expand 'start_foos'.

    for each value, expand 'foo'. if 'last_foo' in template

    map, expand it instead of 'foo' for last key.

    expand 'end_foos'.

    '''

    if plural: names = plural

    else: names = name + 's'

    if not values:

        noname = 'no_' + names

        if noname in templ:

            yield templ(noname, **args)

        return

    if name not in templ:

        if isinstance(values[0], str):

            yield ' '.join(values)

        else:

            for v in values:

                yield dict(v, **args)

        return

    startname = 'start_' + names

    if startname in templ:

        yield templ(startname, **args)

    vargs = args.copy()

    def one(v, tag=name):

        try:

            vargs.update(v)

        except (AttributeError, ValueError):

            try:

                for a, b in v:

                    vargs[a] = b

            except ValueError:

                vargs[name] = v

        return templ(tag, **vargs)

    lastname = 'last_' + name

    if lastname in templ:

        last = values.pop()

    else:

        last = None

    for v in values:

        yield one(v)

    if last is not None:

        yield one(last, tag=lastname)

    endname = 'end_' + names

    if endname in templ:

        yield templ(endname, **args)