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234 lines
6.8 KiB
ReStructuredText
234 lines
6.8 KiB
ReStructuredText
:mod:`readline` --- GNU readline interface
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==========================================
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.. module:: readline
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:platform: Unix
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:synopsis: GNU readline support for Python.
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.. sectionauthor:: Skip Montanaro <skip@pobox.com>
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The :mod:`readline` module defines a number of functions to facilitate
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completion and reading/writing of history files from the Python interpreter.
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This module can be used directly or via the :mod:`rlcompleter` module. Settings
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made using this module affect the behaviour of both the interpreter's
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interactive prompt and the prompts offered by the built-in :func:`input`
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function.
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.. note::
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On MacOS X the :mod:`readline` module can be implemented using
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the ``libedit`` library instead of GNU readline.
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The configuration file for ``libedit`` is different from that
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of GNU readline. If you programmatically load configuration strings
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you can check for the text "libedit" in :const:`readline.__doc__`
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to differentiate between GNU readline and libedit.
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The :mod:`readline` module defines the following functions:
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.. function:: parse_and_bind(string)
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Parse and execute single line of a readline init file.
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.. function:: get_line_buffer()
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Return the current contents of the line buffer.
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.. function:: insert_text(string)
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Insert text into the command line.
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.. function:: read_init_file([filename])
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Parse a readline initialization file. The default filename is the last filename
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used.
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.. function:: read_history_file([filename])
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Load a readline history file. The default filename is :file:`~/.history`.
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.. function:: write_history_file([filename])
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Save a readline history file. The default filename is :file:`~/.history`.
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.. function:: clear_history()
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Clear the current history. (Note: this function is not available if the
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installed version of GNU readline doesn't support it.)
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.. function:: get_history_length()
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Return the desired length of the history file. Negative values imply unlimited
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history file size.
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.. function:: set_history_length(length)
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Set the number of lines to save in the history file. :func:`write_history_file`
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uses this value to truncate the history file when saving. Negative values imply
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unlimited history file size.
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.. function:: get_current_history_length()
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Return the number of lines currently in the history. (This is different from
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:func:`get_history_length`, which returns the maximum number of lines that will
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be written to a history file.)
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.. function:: get_history_item(index)
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Return the current contents of history item at *index*.
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.. function:: remove_history_item(pos)
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Remove history item specified by its position from the history.
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.. function:: replace_history_item(pos, line)
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Replace history item specified by its position with the given line.
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.. function:: redisplay()
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Change what's displayed on the screen to reflect the current contents of the
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line buffer.
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.. function:: set_startup_hook([function])
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Set or remove the startup_hook function. If *function* is specified, it will be
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used as the new startup_hook function; if omitted or ``None``, any hook function
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already installed is removed. The startup_hook function is called with no
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arguments just before readline prints the first prompt.
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.. function:: set_pre_input_hook([function])
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Set or remove the pre_input_hook function. If *function* is specified, it will
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be used as the new pre_input_hook function; if omitted or ``None``, any hook
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function already installed is removed. The pre_input_hook function is called
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with no arguments after the first prompt has been printed and just before
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readline starts reading input characters.
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.. function:: set_completer([function])
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Set or remove the completer function. If *function* is specified, it will be
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used as the new completer function; if omitted or ``None``, any completer
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function already installed is removed. The completer function is called as
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``function(text, state)``, for *state* in ``0``, ``1``, ``2``, ..., until it
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returns a non-string value. It should return the next possible completion
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starting with *text*.
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.. function:: get_completer()
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Get the completer function, or ``None`` if no completer function has been set.
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.. function:: get_completion_type()
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Get the type of completion being attempted.
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.. function:: get_begidx()
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Get the beginning index of the readline tab-completion scope.
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.. function:: get_endidx()
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Get the ending index of the readline tab-completion scope.
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.. function:: set_completer_delims(string)
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Set the readline word delimiters for tab-completion.
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.. function:: get_completer_delims()
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Get the readline word delimiters for tab-completion.
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.. function:: set_completion_display_matches_hook([function])
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Set or remove the completion display function. If *function* is
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specified, it will be used as the new completion display function;
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if omitted or ``None``, any completion display function already
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installed is removed. The completion display function is called as
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``function(substitution, [matches], longest_match_length)`` once
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each time matches need to be displayed.
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.. function:: add_history(line)
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Append a line to the history buffer, as if it was the last line typed.
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.. seealso::
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Module :mod:`rlcompleter`
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Completion of Python identifiers at the interactive prompt.
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.. _readline-example:
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Example
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-------
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The following example demonstrates how to use the :mod:`readline` module's
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history reading and writing functions to automatically load and save a history
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file named :file:`.pyhist` from the user's home directory. The code below would
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normally be executed automatically during interactive sessions from the user's
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:envvar:`PYTHONSTARTUP` file. ::
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import os
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import readline
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histfile = os.path.join(os.path.expanduser("~"), ".pyhist")
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try:
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readline.read_history_file(histfile)
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except IOError:
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pass
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import atexit
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atexit.register(readline.write_history_file, histfile)
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del os, histfile
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The following example extends the :class:`code.InteractiveConsole` class to
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support history save/restore. ::
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import code
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import readline
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import atexit
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import os
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class HistoryConsole(code.InteractiveConsole):
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def __init__(self, locals=None, filename="<console>",
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histfile=os.path.expanduser("~/.console-history")):
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code.InteractiveConsole.__init__(self, locals, filename)
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self.init_history(histfile)
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def init_history(self, histfile):
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readline.parse_and_bind("tab: complete")
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if hasattr(readline, "read_history_file"):
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try:
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readline.read_history_file(histfile)
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except IOError:
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pass
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atexit.register(self.save_history, histfile)
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def save_history(self, histfile):
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readline.write_history_file(histfile)
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