# 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 or any later version.

from __future__ import absolute_import

from .node import hex

from . import (

    error,

    hbisect,

    patch,

    scmutil,

    util,

)

# This helper class allows us to handle both:

#  "{files}" (legacy command-line-specific list hack) and

#  "{files % '{file}\n'}" (hgweb-style with inlining and function support)

# and to access raw values:

#  "{ifcontains(file, files, ...)}", "{ifcontains(key, extras, ...)}"

#  "{get(extras, key)}"

class _hybrid(object):

    def __init__(self, gen, values, makemap, joinfmt=None):

        self.gen = gen

        self.values = values

        self._makemap = makemap

        if joinfmt:

            self.joinfmt = joinfmt

        else:

            self.joinfmt = lambda x: x.values()[0]

    def __iter__(self):

        return self.gen

    def __call__(self):

        makemap = self._makemap

        for x in self.values:

            yield makemap(x)

    def __contains__(self, x):

        return x in self.values

    def __len__(self):

        return len(self.values)

    def __getattr__(self, name):

        if name != 'get':

            raise AttributeError(name)

        return getattr(self.values, name)

def showlist(name, values, plural=None, element=None, separator=' ', **args):

    if not element:

        element = name

    f = _showlist(name, values, plural, separator, **args)

    return _hybrid(f, values, lambda x: {element: x})

def _showlist(name, values, plural=None, separator=' ', **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'.

    separator is used to join values as a string

    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 'separator'.

    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'.

    '''

    templ = args['templ']

    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 separator.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)

def getfiles(repo, ctx, revcache):

    if 'files' not in revcache:

        revcache['files'] = repo.status(ctx.p1(), ctx)[:3]

    return revcache['files']

def getlatesttags(repo, ctx, cache, pattern=None):

    '''return date, distance and name for the latest tag of rev'''

    cachename = 'latesttags'

    if pattern is not None:

        cachename += '-' + pattern

        match = util.stringmatcher(pattern)[2]

    else:

        match = util.always

    if cachename not in cache:

        # Cache mapping from rev to a tuple with tag date, tag

        # distance and tag name

        cache[cachename] = {-1: (0, 0, ['null'])}

    latesttags = cache[cachename]

    rev = ctx.rev()

    todo = [rev]

    while todo:

        rev = todo.pop()

        if rev in latesttags:

            continue

        ctx = repo[rev]

        tags = [t for t in ctx.tags()

                if (repo.tagtype(t) and repo.tagtype(t) != 'local'

                    and match(t))]

        if tags:

            latesttags[rev] = ctx.date()[0], 0, [t for t in sorted(tags)]

            continue

        try:

            # The tuples are laid out so the right one can be found by

            # comparison.

            pdate, pdist, ptag = max(

                latesttags[p.rev()] for p in ctx.parents())

        except KeyError:

            # Cache miss - recurse

            todo.append(rev)

            todo.extend(p.rev() for p in ctx.parents())

            continue

        latesttags[rev] = pdate, pdist + 1, ptag

    return latesttags[rev]

def getrenamedfn(repo, endrev=None):

    rcache = {}

    if endrev is None:

        endrev = len(repo)

    def getrenamed(fn, rev):

        '''looks up all renames for a file (up to endrev) the first

        time the file is given. It indexes on the changerev and only

        parses the manifest if linkrev != changerev.

        Returns rename info for fn at changerev rev.'''

        if fn not in rcache:

            rcache[fn] = {}

            fl = repo.file(fn)

            for i in fl:

                lr = fl.linkrev(i)

                renamed = fl.renamed(fl.node(i))

                rcache[fn][lr] = renamed

                if lr >= endrev:

                    break

        if rev in rcache[fn]:

            return rcache[fn][rev]

        # If linkrev != rev (i.e. rev not found in rcache) fallback to

        # filectx logic.

        try:

            return repo[rev][fn].renamed()

        except error.LookupError:

            return None

    return getrenamed

def showauthor(repo, ctx, templ, **args):

    """:author: String. The unmodified author of the changeset."""

    return ctx.user()

def showbisect(repo, ctx, templ, **args):

    """:bisect: String. The changeset bisection status."""

    return hbisect.label(repo, ctx.node())

def showbranch(**args):

    """:branch: String. The name of the branch on which the changeset was

    committed.

    """

    return args['ctx'].branch()

def showbranches(**args):

    """:branches: List of strings. The name of the branch on which the

    changeset was committed. Will be empty if the branch name was

    default. (DEPRECATED)

    """

    branch = args['ctx'].branch()

    if branch != 'default':

        return showlist('branch', [branch], plural='branches', **args)

    return showlist('branch', [], plural='branches', **args)

def showbookmarks(**args):

    """:bookmarks: List of strings. Any bookmarks associated with the

    changeset. Also sets 'active', the name of the active bookmark.

    """

    repo = args['ctx']._repo

    bookmarks = args['ctx'].bookmarks()

    active = repo._activebookmark

    makemap = lambda v: {'bookmark': v, 'active': active, 'current': active}

    f = _showlist('bookmark', bookmarks, **args)

    return _hybrid(f, bookmarks, makemap, lambda x: x['bookmark'])

def showchildren(**args):

    """:children: List of strings. The children of the changeset."""

    ctx = args['ctx']

    childrevs = ['%d:%s' % (cctx, cctx) for cctx in ctx.children()]

    return showlist('children', childrevs, element='child', **args)

# Deprecated, but kept alive for help generation a purpose.

def showcurrentbookmark(**args):

    """:currentbookmark: String. The active bookmark, if it is

    associated with the changeset (DEPRECATED)"""

    return showactivebookmark(**args)

def showactivebookmark(**args):

    """:activebookmark: String. The active bookmark, if it is

    associated with the changeset"""

    active = args['repo']._activebookmark

    if active and active in args['ctx'].bookmarks():

        return active

    return ''

def showdate(repo, ctx, templ, **args):

    """:date: Date information. The date when the changeset was committed."""

    return ctx.date()

def showdescription(repo, ctx, templ, **args):

    """:desc: String. The text of the changeset description."""

    return ctx.description().strip()

def showdiffstat(repo, ctx, templ, **args):

    """:diffstat: String. Statistics of changes with the following format:

    "modified files: +added/-removed lines"

    """

    stats = patch.diffstatdata(util.iterlines(ctx.diff()))

    maxname, maxtotal, adds, removes, binary = patch.diffstatsum(stats)

    return '%s: +%s/-%s' % (len(stats), adds, removes)

def showextras(**args):

    """:extras: List of dicts with key, value entries of the 'extras'

    field of this changeset."""

    extras = args['ctx'].extra()

    extras = util.sortdict((k, extras[k]) for k in sorted(extras))

    makemap = lambda k: {'key': k, 'value': extras[k]}

    c = [makemap(k) for k in extras]

    f = _showlist('extra', c, plural='extras', **args)

    return _hybrid(f, extras, makemap,

                   lambda x: '%s=%s' % (x['key'], x['value']))

def showfileadds(**args):

    """:file_adds: List of strings. Files added by this changeset."""

    repo, ctx, revcache = args['repo'], args['ctx'], args['revcache']

    return showlist('file_add', getfiles(repo, ctx, revcache)[1],

                    element='file', **args)

def showfilecopies(**args):

    """:file_copies: List of strings. Files copied in this changeset with

    their sources.

    """

    cache, ctx = args['cache'], args['ctx']

    copies = args['revcache'].get('copies')

    if copies is None:

        if 'getrenamed' not in cache:

            cache['getrenamed'] = getrenamedfn(args['repo'])

        copies = []

        getrenamed = cache['getrenamed']

        for fn in ctx.files():

            rename = getrenamed(fn, ctx.rev())

            if rename:

                copies.append((fn, rename[0]))

    copies = util.sortdict(copies)

    makemap = lambda k: {'name': k, 'source': copies[k]}

    c = [makemap(k) for k in copies]

    f = _showlist('file_copy', c, plural='file_copies', **args)

    return _hybrid(f, copies, makemap,

                   lambda x: '%s (%s)' % (x['name'], x['source']))

# showfilecopiesswitch() displays file copies only if copy records are

# provided before calling the templater, usually with a --copies

# command line switch.

def showfilecopiesswitch(**args):

    """:file_copies_switch: List of strings. Like "file_copies" but displayed

    only if the --copied switch is set.

    """

    copies = args['revcache'].get('copies') or []

    copies = util.sortdict(copies)

    makemap = lambda k: {'name': k, 'source': copies[k]}

    c = [makemap(k) for k in copies]

    f = _showlist('file_copy', c, plural='file_copies', **args)

    return _hybrid(f, copies, makemap,

                   lambda x: '%s (%s)' % (x['name'], x['source']))

def showfiledels(**args):

    """:file_dels: List of strings. Files removed by this changeset."""

    repo, ctx, revcache = args['repo'], args['ctx'], args['revcache']

    return showlist('file_del', getfiles(repo, ctx, revcache)[2],

                    element='file', **args)

def showfilemods(**args):

    """:file_mods: List of strings. Files modified by this changeset."""

    repo, ctx, revcache = args['repo'], args['ctx'], args['revcache']

    return showlist('file_mod', getfiles(repo, ctx, revcache)[0],

                    element='file', **args)

def showfiles(**args):

    """:files: List of strings. All files modified, added, or removed by this

    changeset.

    """

    return showlist('file', args['ctx'].files(), **args)

def showlatesttag(**args):

    """:latesttag: List of strings. The global tags on the most recent globally

    tagged ancestor of this changeset.

    """

    return showlatesttags(None, **args)

def showlatesttags(pattern, **args):

    """helper method for the latesttag keyword and function"""

    repo, ctx = args['repo'], args['ctx']

    cache = args['cache']

    latesttags = getlatesttags(repo, ctx, cache, pattern)

    # latesttag[0] is an implementation detail for sorting csets on different

    # branches in a stable manner- it is the date the tagged cset was created,

    # not the date the tag was created.  Therefore it isn't made visible here.

    makemap = lambda v: {

        'changes': _showchangessincetag,

        'distance': latesttags[1],

        'latesttag': v,   # BC with {latesttag % '{latesttag}'}

        'tag': v

    }

    tags = latesttags[2]

    f = _showlist('latesttag', tags, separator=':', **args)

    return _hybrid(f, tags, makemap, lambda x: x['latesttag'])