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众所周知，这Ipython是一个了不起的工具，当我阅读它的源代码时，我发现它prompt_toolkit在它的completer.
我有一个使用 lib 的程序readline，下面的completer代码，我想把它改成prompt_toolkit. 我应该怎么做？

class Completer(object):
    def complete(self, text, state):
        buffer = readline.get_line_buffer()
        line = readline.get_line_buffer().split()
        COMMANDS = actions.keys()
        # show all commands
        if not line:
            return [c + ' ' for c in COMMANDS][state]
        # account for last argument ending in a space
        if RE_SPACE.match(buffer):
            line.append('')
        # resolve command to the implementation function
        cmd = line[0].strip()
        if cmd in COMMANDS:
            impl = getattr(actions[cmd], 'complete')
            args = line[1:]
            if args:
                return (impl(args) + [None])[state]
            return [cmd + ' '][state]
        results = [c + ' ' for c in COMMANDS if c.startswith(cmd)] + [None]
        return results[state]



com = Completer()

if(sys.platform == 'darwin'):
    readline.parse_and_bind("bind ^I rl_complete")
else:
    readline.parse_and_bind("tab: complete")

readline.set_completer_delims(' /\t\n;')
readline.set_completer(com.complete)
readline.set_history_length(10000)
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1 回答 1

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看了源码后，发现唯一要做的就是重写函数，Completer.

希望您返回带有 [state] 的列表的功能Completer。readline

该函数Completer是prompt_toolkit.completion一个生成器函数，我们只需yield要从单词列表中获取。在python3中我们可以使用关键字yield from。

代码应该如下所示：

from prompt_toolkit.completion import Completer, Completion

class MyCustomCompleter(Completer):
    def get_completions(self, document, complete_event):
        buffer = document.text
        line = document.text.split()
        COMMANDS = actions.keys()
        # show all commands
        if not line:
            for i in [c for c in COMMANDS]:
                yield Completion(i, start_position=-1 * len(document.text), display=i)
        # account for last argument ending in a space
        else:
            if RE_SPACE.match(buffer):
                line.append('')
            # resolve command to the implementation function
            cmd = line[0].strip()
            if cmd in COMMANDS:
                try:
                    impl = getattr(actions[cmd], 'complete')
                except:
                    yield Completion(cmd, start_position=-1 * len(document.text))
                else:
                    args = line[1:]
                    if args:
                        ret = impl(args)
                        if not ret:
                            pass
                        else:
                            for i in ret:
                                ret = cmd + ' ' + ' '.join(args[:-1]) + ' ' + i
                                ret = ' '.join(ret.split())
                                yield Completion(ret, start_position=-1 * (len(document.text)), display=i.split()[-1])
                    else:
                        yield Completion(cmd + ' ', start_position=-1 * len(document.text))
            else:
                results = [c for c in COMMANDS if c.startswith(cmd)]
                for i in results:
                    yield Completion(i, start_position=-1 * len(document.text), display=i)

content = prompt(completer=MyCustomCompleter())
于 2017-03-14T03:26:59.133 回答