如何使用python lib，prompt_toolkit替换GNU readline程序？
如何使用python lib，prompt_toolkit替换GNU readline程序？
提问于 2017-02-28 16:47:17
众所周知，Ipython是一个令人惊叹的工具，当我阅读它的源代码时，我发现它的completer中使用了prompt_toolkit。
我有一个使用lib readline的程序，以及类似下面的completer代码，我想将其更改为prompt_toolkit。我该怎么办？
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)回答 1
Stack Overflow用户
发布于 2017-03-14 11:26:59
在我阅读了源代码之后，我发现我唯一需要做的就是重写函数Completer。
readline的函数Completer希望你返回一个带有状态的列表。
prompt_toolkit.completion的函数Completer是一个生成器函数，我们只需要从单词列表中yield。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())页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/42503979
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