# -*- coding: UTF-8 -*-

# beautifygraph.py - improve graph output by using Unicode characters

#

# Copyright 2018 John Stiles <johnstiles@gmail.com>

#

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

# GNU General Public License version 2 or any later version.

'''beautify log -G output by using Unicode characters (EXPERIMENTAL)

   A terminal with UTF-8 support and monospace narrow text are required.

'''

from __future__ import absolute_import

from mercurial.i18n import _

from mercurial import (

    encoding,

    extensions,

    graphmod,

    pycompat,

    templatekw,

)

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for

# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should

# be specifying the version(s) of Mercurial they are tested with, or

# leave the attribute unspecified.

testedwith = b'ships-with-hg-core'

def prettyedge(before, edge, after):

    if edge == b'~':

        return b'\xE2\x95\xA7'  # U+2567 ╧

    if edge == b'/':

        return b'\xE2\x95\xB1'  # U+2571 ╱

    if edge == b'-':

        return b'\xE2\x94\x80'  # U+2500 ─

    if edge == b'|':

        return b'\xE2\x94\x82'  # U+2502 │

    if edge == b':':

        return b'\xE2\x94\x86'  # U+2506 ┆

    if edge == b'\\':

        return b'\xE2\x95\xB2'  # U+2572 ╲

    if edge == b'+':

        if before == b' ' and not after == b' ':

            return b'\xE2\x94\x9C'  # U+251C ├

        if after == b' ' and not before == b' ':

            return b'\xE2\x94\xA4'  # U+2524 ┤

        return b'\xE2\x94\xBC'  # U+253C ┼

    return edge

def convertedges(line):

    line = b' %s ' % line

    pretty = []

    for idx in pycompat.xrange(len(line) - 2):

        pretty.append(

            prettyedge(

                line[idx : idx + 1],

                line[idx + 1 : idx + 2],

                line[idx + 2 : idx + 3],

            )

        )

    return b''.join(pretty)

def getprettygraphnode(orig, *args, **kwargs):

    node = orig(*args, **kwargs)

    if node == b'o':

        return b'\xE2\x97\x8B'  # U+25CB ○

    if node == b'@':

        return b'\xE2\x97\x89'  # U+25C9 ◉

    if node == b'%':

        return b'\xE2\x97\x8D'  # U+25CE ◎

    if node == b'*':

        return b'\xE2\x88\x97'  # U+2217 ∗

    if node == b'x':

        return b'\xE2\x97\x8C'  # U+25CC ◌

    if node == b'_':

        return b'\xE2\x95\xA4'  # U+2564 ╤

    return node

def outputprettygraph(orig, ui, graph, *args, **kwargs):

    (edges, text) = zip(*graph)

    graph = zip([convertedges(e) for e in edges], text)

    return orig(ui, graph, *args, **kwargs)

def extsetup(ui):

    if ui.plain(b'graph'):

        return

    if encoding.encoding != b'UTF-8':

        ui.warn(_(b'beautifygraph: unsupported encoding, UTF-8 required\n'))

        return

    if 'A' in encoding._wide:

        ui.warn(

            _(

                b'beautifygraph: unsupported terminal settings, '

                b'monospace narrow text required\n'

            )

        )

        return

    extensions.wrapfunction(graphmod, b'outputgraph', outputprettygraph)

    extensions.wrapfunction(templatekw, b'getgraphnode', getprettygraphnode)