templates: add filter to reverse list
The filter supports only lists because for lists, it’s straightforward to
implement. Reversing text doesn’t seem very useful and is hard to implement.
Reversing the bytes would break multi-bytes encodings. Reversing the code
points would break characters consisting of multiple code points. Reversing
graphemes is non-trivial without using a library not included in the standard
library.
# -*- 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 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 = 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 range(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)