feat(plugins): add aliases cheatsheet plugin (#4662)

* add: explore alias quickly with aliases plugin.

* change: add compatibility with python2 & python3.

- add compatibility.
- add termcolor.py.
- remove aliass(search), just use acs.
- detect python.

plugins/aliases/aliases.plugin.zsh

+# with lots of 3rd-party amazing aliases installed, just need something to explore it quickly.
+#
+# - acs: alias cheatsheet
+#   group alias by command, pass addition argv to grep.
+ALIASES_PLUGIN_ROOT=$(cd `dirname $0` && pwd)
+function acs(){
+    which python >>/dev/null
+    [[ $? -eq 1 ]] && echo "[error]no python executable detected!" && return
+    alias | python $ALIASES_PLUGIN_ROOT/cheatsheet.py $@
+}

plugins/aliases/cheatsheet.py

+#!/usr/bin/env python
+import sys
+import itertools
+import termcolor
+
+def parse(line):
+    left = line[0:line.find('=')].strip()
+    right = line[line.find('=')+1:].strip('\'"\n ')
+    try:
+        cmd = next(part for part in right.split() if len([char for char in '=<>' if char in part])==0)
+    except StopIteration:
+        cmd = right
+    return (left, right, cmd)
+
+def cheatsheet(lines):
+    exps = [ parse(line) for line in lines ]
+    cheatsheet = {'_default': []}
+    for key, group in itertools.groupby(exps, lambda exp:exp[2]):
+        group_list = [ item for item in group ]
+        if len(group_list)==1:
+            target_aliases = cheatsheet['_default']
+        else:
+            if key not in cheatsheet:
+                cheatsheet[key] = []
+            target_aliases = cheatsheet[key]
+        target_aliases.extend(group_list)
+    return cheatsheet
+
+def pretty_print_group(key, aliases, hightlight=None):
+    if len(aliases) == 0:
+        return
+    group_hl_formatter = lambda g, hl: termcolor.colored(hl, 'yellow').join([termcolor.colored(part, 'red') for part in ('[%s]' % g).split(hl)])
+    alias_hl_formatter = lambda alias, hl: termcolor.colored(hl, 'yellow').join([termcolor.colored(part, 'green') for part in ('\t%s = %s' % alias[0:2]).split(hl)])
+    group_formatter = lambda g: termcolor.colored('[%s]' % g, 'red')
+    alias_formatter = lambda alias: termcolor.colored('\t%s = %s' % alias[0:2], 'green')
+    if hightlight and len(hightlight)>0:
+        print (group_hl_formatter(key, hightlight))
+        print ('\n'.join([alias_hl_formatter(alias, hightlight) for alias in aliases]))
+    else:
+        print (group_formatter(key))
+        print ('\n'.join([alias_formatter(alias) for alias in aliases]))
+    print ('')
+
+def pretty_print(cheatsheet, wfilter):
+    sorted_key = sorted(cheatsheet.keys())
+    for key in sorted_key:
+        aliases = cheatsheet.get(key)
+        if not wfilter:
+            pretty_print_group(key, aliases, wfilter)
+        else:
+            pretty_print_group(key, [ alias for alias in aliases if alias[0].find(wfilter)>-1 or alias[1].find(wfilter)>-1], wfilter)
+
+if __name__ == '__main__':
+    lines = sys.stdin.readlines()
+    pretty_print(cheatsheet(lines), sys.argv[1] if len(sys.argv)>1 else None)

plugins/aliases/termcolor.py

+# coding: utf-8
+# Copyright (c) 2008-2011 Volvox Development Team
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+# Author: Konstantin Lepa <konstantin.lepa@gmail.com>
+
+"""ANSII Color formatting for output in terminal."""
+
+from __future__ import print_function
+import os
+
+
+__ALL__ = [ 'colored', 'cprint' ]
+
+VERSION = (1, 1, 0)
+
+ATTRIBUTES = dict(
+        list(zip([
+            'bold',
+            'dark',
+            '',
+            'underline',
+            'blink',
+            '',
+            'reverse',
+            'concealed'
+            ],
+            list(range(1, 9))
+            ))
+        )
+del ATTRIBUTES['']
+
+
+HIGHLIGHTS = dict(
+        list(zip([
+            'on_grey',
+            'on_red',
+            'on_green',
+            'on_yellow',
+            'on_blue',
+            'on_magenta',
+            'on_cyan',
+            'on_white'
+            ],
+            list(range(40, 48))
+            ))
+        )
+
+
+COLORS = dict(
+        list(zip([
+            'grey',
+            'red',
+            'green',
+            'yellow',
+            'blue',
+            'magenta',
+            'cyan',
+            'white',
+            ],
+            list(range(30, 38))
+            ))
+        )
+
+
+RESET = '\033[0m'
+
+
+def colored(text, color=None, on_color=None, attrs=None):
+    """Colorize text.
+
+    Available text colors:
+        red, green, yellow, blue, magenta, cyan, white.
+
+    Available text highlights:
+        on_red, on_green, on_yellow, on_blue, on_magenta, on_cyan, on_white.
+
+    Available attributes:
+        bold, dark, underline, blink, reverse, concealed.
+
+    Example:
+        colored('Hello, World!', 'red', 'on_grey', ['blue', 'blink'])
+        colored('Hello, World!', 'green')
+    """
+    if os.getenv('ANSI_COLORS_DISABLED') is None:
+        fmt_str = '\033[%dm%s'
+        if color is not None:
+            text = fmt_str % (COLORS[color], text)
+
+        if on_color is not None:
+            text = fmt_str % (HIGHLIGHTS[on_color], text)
+
+        if attrs is not None:
+            for attr in attrs:
+                text = fmt_str % (ATTRIBUTES[attr], text)
+
+        text += RESET
+    return text
+
+
+def cprint(text, color=None, on_color=None, attrs=None, **kwargs):
+    """Print colorize text.
+
+    It accepts arguments of print function.
+    """
+
+    print((colored(text, color, on_color, attrs)), **kwargs)
+
+
+if __name__ == '__main__':
+    print('Current terminal type: %s' % os.getenv('TERM'))
+    print('Test basic colors:')
+    cprint('Grey color', 'grey')
+    cprint('Red color', 'red')
+    cprint('Green color', 'green')
+    cprint('Yellow color', 'yellow')
+    cprint('Blue color', 'blue')
+    cprint('Magenta color', 'magenta')
+    cprint('Cyan color', 'cyan')
+    cprint('White color', 'white')
+    print(('-' * 78))
+
+    print('Test highlights:')
+    cprint('On grey color', on_color='on_grey')
+    cprint('On red color', on_color='on_red')
+    cprint('On green color', on_color='on_green')
+    cprint('On yellow color', on_color='on_yellow')
+    cprint('On blue color', on_color='on_blue')
+    cprint('On magenta color', on_color='on_magenta')
+    cprint('On cyan color', on_color='on_cyan')
+    cprint('On white color', color='grey', on_color='on_white')
+    print('-' * 78)
+
+    print('Test attributes:')
+    cprint('Bold grey color', 'grey', attrs=['bold'])
+    cprint('Dark red color', 'red', attrs=['dark'])
+    cprint('Underline green color', 'green', attrs=['underline'])
+    cprint('Blink yellow color', 'yellow', attrs=['blink'])
+    cprint('Reversed blue color', 'blue', attrs=['reverse'])
+    cprint('Concealed Magenta color', 'magenta', attrs=['concealed'])
+    cprint('Bold underline reverse cyan color', 'cyan',
+            attrs=['bold', 'underline', 'reverse'])
+    cprint('Dark blink concealed white color', 'white',
+            attrs=['dark', 'blink', 'concealed'])
+    print(('-' * 78))
+
+    print('Test mixing:')
+    cprint('Underline red on grey color', 'red', 'on_grey',
+            ['underline'])
+    cprint('Reversed green on red color', 'green', 'on_red', ['reverse'])
+