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134 lines
4.4 KiB
TeX
134 lines
4.4 KiB
TeX
\section{\module{readline} ---
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GNU readline interface}
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\declaremodule{builtin}{readline}
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\platform{Unix}
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\sectionauthor{Skip Montanaro}{skip@mojam.com}
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\modulesynopsis{GNU readline support for Python.}
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The \module{readline} module defines a number of functions used either
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directly or from the \refmodule{rlcompleter} module to facilitate
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completion and history file read and write from the Python
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interpreter.
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The \module{readline} module defines the following functions:
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\begin{funcdesc}{parse_and_bind}{string}
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Parse and execute single line of a readline init file.
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\end{funcdesc}
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\begin{funcdesc}{get_line_buffer}{}
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Return the current contents of the line buffer.
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\end{funcdesc}
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\begin{funcdesc}{insert_text}{string}
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Insert text into the command line.
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\end{funcdesc}
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\begin{funcdesc}{read_init_file}{\optional{filename}}
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Parse a readline initialization file.
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The default filename is the last filename used.
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\end{funcdesc}
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\begin{funcdesc}{read_history_file}{\optional{filename}}
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Load a readline history file.
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The default filename is \file{\~{}/.history}.
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\end{funcdesc}
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\begin{funcdesc}{write_history_file}{\optional{filename}}
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Save a readline history file.
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The default filename is \file{\~{}/.history}.
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\end{funcdesc}
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\begin{funcdesc}{get_history_length}{}
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Return the desired length of the history file. Negative values imply
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unlimited history file size.
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\end{funcdesc}
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\begin{funcdesc}{set_history_length}{length}
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Set the number of lines to save in the history file.
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\function{write_history_file()} uses this value to truncate the
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history file when saving. Negative values imply unlimited history
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file size.
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\end{funcdesc}
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\begin{funcdesc}{set_startup_hook}{\optional{function}}
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Set or remove the startup_hook function. If \var{function} is specified,
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it will be used as the new startup_hook function; if omitted or
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\code{None}, any hook function already installed is removed. The
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startup_hook function is called with no arguments just
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before readline prints the first prompt.
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\end{funcdesc}
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\begin{funcdesc}{set_pre_input_hook}{\optional{function}}
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Set or remove the pre_input_hook function. If \var{function} is specified,
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it will be used as the new pre_input_hook function; if omitted or
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\code{None}, any hook function already installed is removed. The
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pre_input_hook function is called with no arguments after the first prompt
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has been printed and just before readline starts reading input characters.
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\end{funcdesc}
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\begin{funcdesc}{set_completer}{\optional{function}}
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Set or remove the completer function. If \var{function} is specified,
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it will be used as the new completer function; if omitted or
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\code{None}, any completer function already installed is removed. The
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completer function is called as \code{\var{function}(\var{text},
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\var{state})}, for \var{state} in \code{0}, \code{1}, \code{2}, ...,
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until it returns a non-string value. It should return the next
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possible completion starting with \var{text}.
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\end{funcdesc}
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\begin{funcdesc}{get_completer}{}
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Get the completer function, or \code{None} if no completer function
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has been set. \versionadded{2.3}
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\end{funcdesc}
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\begin{funcdesc}{get_begidx}{}
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Get the beginning index of the readline tab-completion scope.
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\end{funcdesc}
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\begin{funcdesc}{get_endidx}{}
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Get the ending index of the readline tab-completion scope.
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\end{funcdesc}
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\begin{funcdesc}{set_completer_delims}{string}
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Set the readline word delimiters for tab-completion.
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\end{funcdesc}
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\begin{funcdesc}{get_completer_delims}{}
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Get the readline word delimiters for tab-completion.
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\end{funcdesc}
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\begin{funcdesc}{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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\end{funcdesc}
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\begin{seealso}
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\seemodule{rlcompleter}{Completion of Python identifiers at the
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interactive prompt.}
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\end{seealso}
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\subsection{Example \label{readline-example}}
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The following example demonstrates how to use the
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\module{readline} module's history reading and writing functions to
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automatically load and save a history file named \file{.pyhist} from
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the user's home directory. The code below would normally be executed
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automatically during interactive sessions from the user's
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\envvar{PYTHONSTARTUP} file.
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\begin{verbatim}
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import os
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histfile = os.path.join(os.environ["HOME"], ".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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\end{verbatim}
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