# -*- 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,

    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 = 'ships-with-hg-core'

def prettyedge(before, edge, after):

    if edge == '~':

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

    if edge == 'X':

        return '\xE2\x95\xB3' # U+2573 ╳

    if edge == '/':

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

    if edge == '-':

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

    if edge == '|':

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

    if edge == ':':

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

    if edge == '\\':

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

    if edge == '+':

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

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

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

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

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

    return edge

def convertedges(line):

    line = ' %s ' % line

    pretty = []

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

        pretty.append(prettyedge(line[idx], line[idx + 1], line[idx + 2]))

    return ''.join(pretty)

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

    node = orig(*args, **kwargs)

    if node == 'o':

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

    if node == '@':

        return '\xE2\x97\x8D' # U+25CD ◍

    if node == '*':

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

    if node == 'x':

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

    if node == '_':

        return '\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 encoding.encoding != 'UTF-8':

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

        return

    if 'A' in encoding._wide:

        ui.warn(_('beautifygraph: unsupported terminal settings, '

                  'monospace narrow text required\n'))

        return

    if ui.plain('graph'):

        return

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

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