| 1 | """
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| 2 | py_readline.py: GNU readline wrapper that's also implemented in C++
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| 3 | """
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| 4 |
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| 5 | try:
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| 6 | import line_input
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| 7 | except ImportError:
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| 8 | line_input = None
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| 9 |
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| 10 | from typing import Optional, TYPE_CHECKING
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| 11 | if TYPE_CHECKING:
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| 12 | from core.completion import ReadlineCallback
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| 13 | from core.comp_ui import _IDisplay
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| 14 |
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| 15 |
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| 16 | class Readline(object):
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| 17 | """A thin wrapper around GNU readline to make it usable from C++."""
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| 18 |
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| 19 | def __init__(self):
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| 20 | # type: () -> None
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| 21 | assert line_input is not None
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| 22 |
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| 23 | def prompt_input(self, prompt):
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| 24 | # type: (str) -> str
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| 25 | """
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| 26 | Print prompt, read line, and return it with trailing newline. Or raise
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| 27 | EOFError.
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| 28 | """
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| 29 | # Add trailing newline to make GNU readline conform to Python's
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| 30 | # f.readline() interface
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| 31 | return raw_input(prompt) + '\n'
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| 32 |
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| 33 | def parse_and_bind(self, s):
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| 34 | # type: (str) -> None
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| 35 | line_input.parse_and_bind(s)
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| 36 |
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| 37 | def add_history(self, line):
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| 38 | # type: (str) -> None
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| 39 | line_input.add_history(line)
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| 40 |
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| 41 | def read_history_file(self, path=None):
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| 42 | # type: (Optional[str]) -> None
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| 43 | line_input.read_history_file(path)
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| 44 |
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| 45 | def write_history_file(self, path=None):
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| 46 | # type: (Optional[str]) -> None
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| 47 | line_input.write_history_file(path)
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| 48 |
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| 49 | def set_completer(self, completer=None):
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| 50 | # type: (Optional[ReadlineCallback]) -> None
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| 51 | line_input.set_completer(completer)
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| 52 |
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| 53 | def set_completer_delims(self, delims):
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| 54 | # type: (str) -> None
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| 55 | line_input.set_completer_delims(delims)
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| 56 |
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| 57 | def set_completion_display_matches_hook(self, display=None):
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| 58 | # type: (Optional[_IDisplay]) -> None
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| 59 | hook = None
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| 60 | if display is not None:
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| 61 | hook = lambda *args: display.PrintCandidates(*args)
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| 62 |
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| 63 | line_input.set_completion_display_matches_hook(hook)
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| 64 |
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| 65 | def get_line_buffer(self):
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| 66 | # type: () -> str
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| 67 | return line_input.get_line_buffer()
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| 68 |
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| 69 | def get_begidx(self):
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| 70 | # type: () -> int
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| 71 | return line_input.get_begidx()
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| 72 |
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| 73 | def get_endidx(self):
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| 74 | # type: () -> int
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| 75 | return line_input.get_endidx()
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| 76 |
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| 77 | def clear_history(self):
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| 78 | # type: () -> None
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| 79 | line_input.clear_history()
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| 80 |
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| 81 | def get_history_item(self, pos):
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| 82 | # type: (int) -> str
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| 83 | return line_input.get_history_item(pos)
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| 84 |
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| 85 | def remove_history_item(self, pos):
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| 86 | # type: (int) -> None
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| 87 | line_input.remove_history_item(pos)
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| 88 |
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| 89 | def get_current_history_length(self):
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| 90 | # type: () -> int
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| 91 | return line_input.get_current_history_length()
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| 92 |
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| 93 | def resize_terminal(self):
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| 94 | # type: () -> None
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| 95 | line_input.resize_terminal()
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| 96 |
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| 97 |
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| 98 | def MaybeGetReadline():
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| 99 | # type: () -> Optional[Readline]
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| 100 | """Returns a readline "module" if we were built with readline support."""
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| 101 | if line_input is not None:
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| 102 | return Readline()
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| 103 |
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| 104 | return None
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| 105 |
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| 106 |
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| 107 | if __name__ == '__main__':
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| 108 | import sys
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| 109 | readline = MaybeGetReadline()
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| 110 | try:
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| 111 | prompt_str = sys.argv[1]
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| 112 | except IndexError:
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| 113 | prompt_str = '! '
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| 114 |
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| 115 | while True:
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| 116 | x = readline.prompt_input(prompt_str)
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| 117 | print(x)
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