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/usr/share/weechat/python/completion.py is in weechat-scripts 20131007-1.

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# -*- coding: utf-8 -*-
###
# Copyright (c) 2010 by Elián Hanisch <lambdae2@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
###

###
#
#   This scripts adds word completion, like irssi's /completion
#   (depends on WeeChat 0.3.1 or newer)
#
#   Commands:
#   * /completion: see /help completion
#
#
#   Settings:
#   * plugins.var.python.completion.replace_values:
#     Completion list, it shouldn't be edited by hand.
#
#
#   History:
#   2010-05-08
#   version 0.2:
#   * complete any word behind the cursor, not just the last one in input line.
#   * change script display name 'completion' to 'cmpl'.
#
#   2010-01-26
#   version 0.1: release
#
###

try:
    import weechat
    WEECHAT_RC_OK = weechat.WEECHAT_RC_OK
    import_ok = True
except ImportError:
    print "This script must be run under WeeChat."
    print "Get WeeChat now at: http://www.weechat.org/"
    import_ok = False

SCRIPT_NAME    = "completion"
SCRIPT_AUTHOR  = "Elián Hanisch <lambdae2@gmail.com>"
SCRIPT_VERSION = "0.2"
SCRIPT_LICENSE = "GPL3"
SCRIPT_DESC    = "Word completions for WeeChat"
SCRIPT_COMMAND = "completion"

### Config ###
settings = {
'replace_values':''
}

### Messages ###
def decode(s):
    if isinstance(s, str):
        s = s.decode('utf-8')
    return s

def encode(u):
    if isinstance(u, unicode):
        u = u.encode('utf-8')
    return u

def debug(s, prefix='', buffer=None):
    """Debug msg"""
    #if not weechat.config_get_plugin('debug'): return
    if buffer is None:
        buffer_name = 'DEBUG_' + SCRIPT_NAME
        buffer = weechat.buffer_search('python', buffer_name)
        if not buffer:
            buffer = weechat.buffer_new(buffer_name, '', '', '', '')
            weechat.buffer_set(buffer, 'nicklist', '0')
            weechat.buffer_set(buffer, 'time_for_each_line', '0')
            weechat.buffer_set(buffer, 'localvar_set_no_log', '1')
    s = encode(s)
    weechat.prnt(buffer, '%s\t%s' %(prefix, s))

def error(s, prefix=None, buffer='', trace=''):
    """Error msg"""
    prefix = prefix or script_nick
    s = encode(s)
    weechat.prnt(buffer, '%s%s %s' %(weechat.prefix('error'), prefix, s))
    if weechat.config_get_plugin('debug'):
        if not trace:
            import traceback
            if traceback.sys.exc_type:
                trace = traceback.format_exc()
        not trace or weechat.prnt('', trace)

def say(s, prefix=None, buffer=''):
    """normal msg"""
    prefix = prefix or script_nick
    s = encode(s)
    weechat.prnt(buffer, '%s\t%s' %(prefix, s))

print_replace = lambda k,v : say('%s %s=>%s %s' %(k, color_delimiter, color_reset, v))

### Config functions ###
class UTFDict(dict):
    decode = staticmethod(decode)
    encode = staticmethod(encode)

    def __init__(self, d={}):
        dict.__init__(self)
        for k, v in d.iteritems():
            self[k] = v

    def __setitem__(self, k, v):
        k = self.decode(k)
        v = self.decode(v)
        dict.__setitem__(self, k, v)

    def __getitem__(self, k):
        k = self.decode(k)
        return dict.__getitem__(self, k)

    def __delitem__(self, k):
        k = self.decode(k)
        dict.__delitem__(self, k)

    def __contains__(self, k):
        k = self.decode(k)
        return dict.__contains__(self, k)

    def __str__(self):
        values = [ '%s=>%s' %(k, v) for k, v in self.iteritems() ]
        values = ';;'.join(values)
        return self.encode(values)


def get_config_dict(config):
    value = weechat.config_get_plugin(config)
    if not value:
        return {}
    values = value.split(';;')
    values = map(lambda s: s.split('=>'), values)
    #debug(values)
    return dict(values)

def load_replace_table():
    global replace_table
    replace_table = UTFDict(get_config_dict('replace_values'))

def save_replace_table():
    global replace_table
    weechat.config_set_plugin('replace_values', str(replace_table))

### Commands ###
def cmd_completion(data, buffer, args):
    global replace_table
    if not args:
        if replace_table:
            for k, v in replace_table.iteritems():
                print_replace(k, v)
        else:
            say('No completions.')
        return WEECHAT_RC_OK
    cmd, space, args = args.partition(' ')
    if cmd == 'add':
        word, space, text = args.partition(' ')
        k, v = word.strip(), text.strip()
        replace_table[k] = v
        save_replace_table()
        say('added: %s %s=>%s %s' %(k, color_delimiter, color_reset, v))
    elif cmd == 'del':
        k = args.strip()
        try:
            del replace_table[k]
            save_replace_table()
            say("completion for '%s' deleted." %k)
            save_replace_table()
        except KeyError:
            error("completion for '%s' not found." %k)
    return WEECHAT_RC_OK

### Completion ###
def completion_replacer(data, completion_item, buffer, completion):
    global replace_table
    pos = weechat.buffer_get_integer(buffer, 'input_pos')
    input = decode(weechat.buffer_get_string(buffer, 'input'))
    #debug('%r %s %s' %(input, len(input), pos))
    if pos > 0 and (pos == len(input) or input[pos] == ' '):
        n = input.rfind(' ', 0, pos)
        word = input[n+1:pos]
        #debug(repr(word))
        if word in replace_table:
            replace = replace_table[word]
            if pos >= len(input.strip()):
                # cursor is in the end of line, append a space
                replace += ' '
            n = len(word)
            input = '%s%s%s' %(input[:pos-n], replace, input[pos:])
            weechat.buffer_set(buffer, 'input', encode(input))
            weechat.buffer_set(buffer, 'input_pos', str(pos - n + len(replace)))
    return WEECHAT_RC_OK

def completion_keys(data, completion_item, buffer, completion):
    global replace_table
    for k in replace_table:
        weechat.hook_completion_list_add(completion, encode(k), 0, weechat.WEECHAT_LIST_POS_SORT)
    return WEECHAT_RC_OK

### Main ###
if __name__ == '__main__' and import_ok and \
        weechat.register(SCRIPT_NAME, SCRIPT_AUTHOR, SCRIPT_VERSION, SCRIPT_LICENSE, \
        SCRIPT_DESC, '', ''):

    # colors
    color_delimiter   = weechat.color('chat_delimiters')
    color_script_nick = weechat.color('chat_nick')
    color_reset   = weechat.color('reset')

    # pretty [SCRIPT_NAME]
    script_nick = '%s[%s%s%s]%s' %(color_delimiter, color_script_nick, 'cmpl', color_delimiter,
            color_reset)

    version = weechat.info_get('version', '')
    if version == '0.3.0':
        error('WeeChat 0.3.1 or newer is required for this script.')
    else:
        # settings
        for opt, val in settings.iteritems():
            if not weechat.config_is_set_plugin(opt):
                weechat.config_set_plugin(opt, val)

        load_replace_table()

        completion_template = 'completion_script'
        weechat.hook_completion(completion_template,
                "Replaces last word in input by its configured value.", 'completion_replacer', '')
        weechat.hook_completion('completion_keys', "Words in completion list.", 'completion_keys', '')

        weechat.hook_command(SCRIPT_COMMAND, SCRIPT_DESC , "[add <word> <text>|del <word>]",
"""
add: adds a new completion, <word> => <text>.
del: deletes a completion.
Without arguments it displays current completions.

<word> will be replaced by <text> when pressing tab in input line,
where <word> is any word currently behind the cursor.

Setup:
For this script to work, you must add the template
%%(%(completion)s) to the default completion template, use:
/set weechat.completion.default_template "%%(nicks)|%%(irc_channels)|%%(%(completion)s)"

Examples:
/%(command)s add wee WeeChat (typing wee<tab> will replace 'wee' by 'WeeChat')
/%(command)s add weeurl http://www.weechat.org/
/%(command)s add test This is a test!
""" %dict(completion=completion_template, command=SCRIPT_COMMAND),
            'add|del %(completion_keys)', 'cmd_completion', '')

# vim:set shiftwidth=4 tabstop=4 softtabstop=4 expandtab textwidth=100: