789 lines
18 KiB
Groff
789 lines
18 KiB
Groff
.\" $NetBSD: editline.3,v 1.50 2005/10/12 09:29:43 wiz Exp $
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.\"
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.\" Copyright (c) 1997-2003 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This file was contributed to The NetBSD Foundation by Luke Mewburn.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 4, 2005
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.Os
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.Dt EDITLINE 3
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.Sh NAME
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.Nm editline ,
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.Nm el_init ,
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.Nm el_end ,
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.Nm el_reset ,
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.Nm el_gets ,
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.Nm el_getc ,
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.Nm el_push ,
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.Nm el_parse ,
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.Nm el_set ,
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.Nm el_get ,
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.Nm el_source ,
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.Nm el_resize ,
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.Nm el_line ,
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.Nm el_insertstr ,
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.Nm el_deletestr ,
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.Nm history_init ,
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.Nm history_end ,
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.Nm history ,
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.Nm tok_init ,
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.Nm tok_end ,
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.Nm tok_reset ,
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.Nm tok_line ,
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.Nm tok_str
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.Nd line editor, history and tokenization functions
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.Sh LIBRARY
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.Lb libedit
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.Sh SYNOPSIS
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.In histedit.h
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.Ft EditLine *
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.Fn el_init "const char *prog" "FILE *fin" "FILE *fout" "FILE *ferr"
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.Ft void
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.Fn el_end "EditLine *e"
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.Ft void
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.Fn el_reset "EditLine *e"
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.Ft const char *
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.Fn el_gets "EditLine *e" "int *count"
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.Ft int
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.Fn el_getc "EditLine *e" "char *ch"
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.Ft void
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.Fn el_push "EditLine *e" "char *str"
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.Ft int
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.Fn el_parse "EditLine *e" "int argc" "const char *argv[]"
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.Ft int
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.Fn el_set "EditLine *e" "int op" "..."
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.Ft int
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.Fn el_get "EditLine *e" "int op" "void *result"
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.Ft int
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.Fn el_source "EditLine *e" "const char *file"
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.Ft void
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.Fn el_resize "EditLine *e"
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.Ft const LineInfo *
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.Fn el_line "EditLine *e"
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.Ft int
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.Fn el_insertstr "EditLine *e" "const char *str"
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.Ft void
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.Fn el_deletestr "EditLine *e" "int count"
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.Ft History *
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.Fn history_init
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.Ft void
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.Fn history_end "History *h"
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.Ft int
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.Fn history "History *h" "HistEvent *ev" "int op" "..."
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.Ft Tokenizer *
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.Fn tok_init "const char *IFS"
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.Ft void
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.Fn tok_end "Tokenizer *t"
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.Ft void
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.Fn tok_reset "Tokenizer *t"
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.Ft int
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.Fo tok_line
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.Fa "Tokenizer *t" "const LineInfo *li" "int *argc" "const char **argv[]"
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.Fa "int *cursorc" "int *cursoro"
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.Fc
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.Ft int
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.Fn tok_str "Tokenizer *t" "const char *str" "int *argc" "const char **argv[]"
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.Sh DESCRIPTION
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The
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.Nm
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library provides generic line editing, history and tokenization functions,
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similar to those found in
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.Xr sh 1 .
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.Pp
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These functions are available in the
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.Nm libedit
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library (which needs the
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.Nm libtermcap
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library).
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Programs should be linked with
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.Fl ledit ltermcap .
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.Sh LINE EDITING FUNCTIONS
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The line editing functions use a common data structure,
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.Fa EditLine ,
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which is created by
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.Fn el_init
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and freed by
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.Fn el_end .
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.Pp
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The following functions are available:
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.Bl -tag -width 4n
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.It Fn el_init
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Initialise the line editor, and return a data structure
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to be used by all other line editing functions.
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.Fa prog
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is the name of the invoking program, used when reading the
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.Xr editrc 5
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file to determine which settings to use.
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.Fa fin ,
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.Fa fout
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and
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.Fa ferr
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are the input, output, and error streams (respectively) to use.
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In this documentation, references to
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.Dq the tty
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are actually to this input/output stream combination.
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.It Fn el_end
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Clean up and finish with
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.Fa e ,
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assumed to have been created with
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.Fn el_init .
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.It Fn el_reset
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Reset the tty and the parser.
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This should be called after an error which may have upset the tty's
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state.
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.It Fn el_gets
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Read a line from the tty.
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.Fa count
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is modified to contain the number of characters read.
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Returns the line read if successful, or
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.Dv NULL
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if no characters were read or if an error occurred.
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.It Fn el_getc
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Read a character from the tty.
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.Fa ch
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is modified to contain the character read.
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Returns the number of characters read if successful, \-1 otherwise.
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.It Fn el_push
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Pushes
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.Fa str
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back onto the input stream.
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This is used by the macro expansion mechanism.
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Refer to the description of
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.Ic bind
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.Fl s
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in
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.Xr editrc 5
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for more information.
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.It Fn el_parse
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Parses the
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.Fa argv
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array (which is
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.Fa argc
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elements in size)
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to execute builtin
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.Nm
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commands.
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If the command is prefixed with
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.Dq prog:
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then
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.Fn el_parse
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will only execute the command if
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.Dq prog
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matches the
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.Fa prog
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argument supplied to
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.Fn el_init .
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The return value is
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\-1 if the command is unknown,
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0 if there was no error or
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.Dq prog
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did not match, or
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1 if the command returned an error.
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Refer to
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.Xr editrc 5
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for more information.
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.It Fn el_set
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Set
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.Nm
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parameters.
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.Fa op
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determines which parameter to set, and each operation has its
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own parameter list.
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.Pp
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The following values for
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.Fa op
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are supported, along with the required argument list:
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.Bl -tag -width 4n
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.It Dv EL_PROMPT , Fa "char *(*f)(EditLine *)"
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Define prompt printing function as
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.Fa f ,
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which is to return a string that contains the prompt.
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.It Dv EL_RPROMPT , Fa "char *(*f)(EditLine *)"
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Define right side prompt printing function as
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.Fa f ,
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which is to return a string that contains the prompt.
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.It Dv EL_TERMINAL , Fa "const char *type"
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Define terminal type of the tty to be
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.Fa type ,
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or to
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.Ev TERM
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if
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.Fa type
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is
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.Dv NULL .
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.It Dv EL_EDITOR , Fa "const char *mode"
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Set editing mode to
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.Fa mode ,
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which must be one of
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.Dq emacs
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or
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.Dq vi .
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.It Dv EL_SIGNAL , Fa "int flag"
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If
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.Fa flag
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is non-zero,
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.Nm
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will install its own signal handler for the following signals when
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reading command input:
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.Dv SIGCONT ,
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.Dv SIGHUP ,
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.Dv SIGINT ,
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.Dv SIGQUIT ,
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.Dv SIGSTOP ,
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.Dv SIGTERM ,
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.Dv SIGTSTP ,
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and
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.Dv SIGWINCH .
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Otherwise, the current signal handlers will be used.
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.It Dv EL_BIND , Xo
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.Fa "const char *" ,
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.Fa "..." ,
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.Dv NULL
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.Xc
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Perform the
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.Ic bind
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builtin command.
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Refer to
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.Xr editrc 5
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for more information.
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.It Dv EL_ECHOTC , Xo
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.Fa "const char *" ,
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.Fa "..." ,
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.Dv NULL
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.Xc
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Perform the
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.Ic echotc
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builtin command.
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Refer to
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.Xr editrc 5
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for more information.
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.It Dv EL_SETTC , Xo
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.Fa "const char *" ,
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.Fa "..." ,
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.Dv NULL
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.Xc
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Perform the
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.Ic settc
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builtin command.
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Refer to
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.Xr editrc 5
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for more information.
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.It Dv EL_SETTY , Xo
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.Fa "const char *" ,
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.Fa "..." ,
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.Dv NULL
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.Xc
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Perform the
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.Ic setty
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builtin command.
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Refer to
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.Xr editrc 5
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for more information.
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.It Dv EL_TELLTC , Xo
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.Fa "const char *" ,
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.Fa "..." ,
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.Dv NULL
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.Xc
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Perform the
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.Ic telltc
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builtin command.
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Refer to
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.Xr editrc 5
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|
for more information.
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.It Dv EL_ADDFN , Xo
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.Fa "const char *name" ,
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.Fa "const char *help" ,
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.Fa "unsigned char (*func)(EditLine *e, int ch)"
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.Xc
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Add a user defined function,
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.Fn func ,
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referred to as
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.Fa name
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which is invoked when a key which is bound to
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.Fa name
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is entered.
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.Fa help
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is a description of
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.Fa name .
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At invocation time,
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.Fa ch
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is the key which caused the invocation.
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The return value of
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.Fn func
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should be one of:
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.Bl -tag -width "CC_REDISPLAY"
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.It Dv CC_NORM
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Add a normal character.
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.It Dv CC_NEWLINE
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|
End of line was entered.
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.It Dv CC_EOF
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EOF was entered.
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.It Dv CC_ARGHACK
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Expecting further command input as arguments, do nothing visually.
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.It Dv CC_REFRESH
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Refresh display.
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.It Dv CC_REFRESH_BEEP
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Refresh display, and beep.
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.It Dv CC_CURSOR
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Cursor moved, so update and perform
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.Dv CC_REFRESH .
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.It Dv CC_REDISPLAY
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Redisplay entire input line.
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This is useful if a key binding outputs extra information.
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.It Dv CC_ERROR
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An error occurred.
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Beep, and flush tty.
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.It Dv CC_FATAL
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Fatal error, reset tty to known state.
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.El
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.It Dv EL_HIST , Xo
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.Fa "History *(*func)(History *, int op, ...)" ,
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.Fa "const char *ptr"
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.Xc
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Defines which history function to use, which is usually
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.Fn history .
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.Fa ptr
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should be the value returned by
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.Fn history_init .
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.It Dv EL_EDITMODE , Fa "int flag"
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If
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.Fa flag
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is non-zero,
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editing is enabled (the default).
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Note that this is only an indication, and does not
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affect the operation of
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.Nm .
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At this time, it is the caller's responsibility to
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check this
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(using
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.Fn el_get )
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to determine if editing should be enabled or not.
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.It Dv EL_GETCFN , Fa "int (*f)(EditLine *, char *c)"
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Define the character reading function as
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.Fa f ,
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which is to return the number of characters read and store them in
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.Fa c .
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|
This function is called internally by
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.Fn el_gets
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and
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|
.Fn el_getc .
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|
The builtin function can be set or restored with the special function
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name
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.Dv EL_BUILTIN_GETCFN .
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.It Dv EL_CLIENTDATA , Fa "void *data"
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Register
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.Fa data
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to be associated with this EditLine structure.
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It can be retrieved with the corresponding
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.Fn el_get
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call.
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.El
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.It Fn el_get
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|
Get
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.Nm
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|
parameters.
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|
.Fa op
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|
determines which parameter to retrieve into
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.Fa result .
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Returns 0 if successful, \-1 otherwise.
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.Pp
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The following values for
|
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.Fa op
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|
are supported, along with actual type of
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.Fa result :
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.Bl -tag -width 4n
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.It Dv EL_PROMPT , Fa "char *(*f)(EditLine *)"
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Return a pointer to the function that displays the prompt.
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.It Dv EL_RPROMPT , Fa "char *(*f)(EditLine *)"
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Return a pointer to the function that displays the rightside prompt.
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|
.It Dv EL_EDITOR , Fa "const char *"
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|
Return the name of the editor, which will be one of
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|
.Dq emacs
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or
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|
.Dq vi .
|
|
.It Dv EL_SIGNAL , Fa "int *"
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|
Return non-zero if
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.Nm
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has installed private signal handlers (see
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.Fn el_get
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|
above).
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|
.It Dv EL_EDITMODE, Fa "int *"
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|
Return non-zero if editing is enabled.
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|
.It Dv EL_GETCFN, Fa "int (**f)(EditLine *, char *)"
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|
Return a pointer to the function that read characters, which is equal to
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|
.Dv EL_BUILTIN_GETCFN
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|
in the case of the default builtin function.
|
|
.It Dv EL_CLIENTDATA , Fa "void **data"
|
|
Retrieve
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|
.Fa data
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|
previously registered with the corresponding
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|
.Fn el_set
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|
call.
|
|
.It Dv EL_UNBUFFERED, Fa "int"
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|
Sets or clears unbuffered mode.
|
|
In this mode,
|
|
.Fn el_gets
|
|
will return immediately after processing a single character.
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|
.It Dv EL_PREP_TERM, Fa "int"
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|
Sets or clears terminal editing mode.
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|
.El
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.It Fn el_source
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|
Initialise
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|
.Nm
|
|
by reading the contents of
|
|
.Fa file .
|
|
.Fn el_parse
|
|
is called for each line in
|
|
.Fa file .
|
|
If
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|
.Fa file
|
|
is
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|
.Dv NULL ,
|
|
try
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|
.Pa $PWD/.editrc
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|
then
|
|
.Pa $HOME/.editrc .
|
|
Refer to
|
|
.Xr editrc 5
|
|
for details on the format of
|
|
.Fa file .
|
|
.It Fn el_resize
|
|
Must be called if the terminal size changes.
|
|
If
|
|
.Dv EL_SIGNAL
|
|
has been set with
|
|
.Fn el_set ,
|
|
then this is done automatically.
|
|
Otherwise, it is the responsibility of the application to call
|
|
.Fn el_resize
|
|
on the appropriate occasions.
|
|
.It Fn el_line
|
|
Return the editing information for the current line in a
|
|
.Fa LineInfo
|
|
structure, which is defined as follows:
|
|
.Bd -literal
|
|
typedef struct lineinfo {
|
|
const char *buffer; /* address of buffer */
|
|
const char *cursor; /* address of cursor */
|
|
const char *lastchar; /* address of last character */
|
|
} LineInfo;
|
|
.Ed
|
|
.Pp
|
|
.Fa buffer
|
|
is not NUL terminated.
|
|
This function may be called after
|
|
.Fn el_gets
|
|
to obtain the
|
|
.Fa LineInfo
|
|
structure pertaining to line returned by that function,
|
|
and from within user defined functions added with
|
|
.Dv EL_ADDFN .
|
|
.It Fn el_insertstr
|
|
Insert
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|
.Fa str
|
|
into the line at the cursor.
|
|
Returns \-1 if
|
|
.Fa str
|
|
is empty or will not fit, and 0 otherwise.
|
|
.It Fn el_deletestr
|
|
Delete
|
|
.Fa num
|
|
characters before the cursor.
|
|
.El
|
|
.Sh HISTORY LIST FUNCTIONS
|
|
The history functions use a common data structure,
|
|
.Fa History ,
|
|
which is created by
|
|
.Fn history_init
|
|
and freed by
|
|
.Fn history_end .
|
|
.Pp
|
|
The following functions are available:
|
|
.Bl -tag -width 4n
|
|
.It Fn history_init
|
|
Initialise the history list, and return a data structure
|
|
to be used by all other history list functions.
|
|
.It Fn history_end
|
|
Clean up and finish with
|
|
.Fa h ,
|
|
assumed to have been created with
|
|
.Fn history_init .
|
|
.It Fn history
|
|
Perform operation
|
|
.Fa op
|
|
on the history list, with optional arguments as needed by the
|
|
operation.
|
|
.Fa ev
|
|
is changed accordingly to operation.
|
|
The following values for
|
|
.Fa op
|
|
are supported, along with the required argument list:
|
|
.Bl -tag -width 4n
|
|
.It Dv H_SETSIZE , Fa "int size"
|
|
Set size of history to
|
|
.Fa size
|
|
elements.
|
|
.It Dv H_GETSIZE
|
|
Get number of events currently in history.
|
|
.It Dv H_END
|
|
Cleans up and finishes with
|
|
.Fa h ,
|
|
assumed to be created with
|
|
.Fn history_init .
|
|
.It Dv H_CLEAR
|
|
Clear the history.
|
|
.It Dv H_FUNC , Xo
|
|
.Fa "void *ptr" ,
|
|
.Fa "history_gfun_t first" ,
|
|
.Fa "history_gfun_t next" ,
|
|
.Fa "history_gfun_t last" ,
|
|
.Fa "history_gfun_t prev" ,
|
|
.Fa "history_gfun_t curr" ,
|
|
.Fa "history_sfun_t set" ,
|
|
.Fa "history_vfun_t clear" ,
|
|
.Fa "history_efun_t enter" ,
|
|
.Fa "history_efun_t add"
|
|
.Xc
|
|
Define functions to perform various history operations.
|
|
.Fa ptr
|
|
is the argument given to a function when it is invoked.
|
|
.It Dv H_FIRST
|
|
Return the first element in the history.
|
|
.It Dv H_LAST
|
|
Return the last element in the history.
|
|
.It Dv H_PREV
|
|
Return the previous element in the history.
|
|
.It Dv H_NEXT
|
|
Return the next element in the history.
|
|
.It Dv H_CURR
|
|
Return the current element in the history.
|
|
.It Dv H_SET
|
|
Set the cursor to point to the requested element.
|
|
.It Dv H_ADD , Fa "const char *str"
|
|
Append
|
|
.Fa str
|
|
to the current element of the history, or perform the
|
|
.Dv H_ENTER
|
|
operation with argument
|
|
.Fa str
|
|
if there is no current element.
|
|
.It Dv H_APPEND , Fa "const char *str"
|
|
Append
|
|
.Fa str
|
|
to the last new element of the history.
|
|
.It Dv H_ENTER , Fa "const char *str"
|
|
Add
|
|
.Fa str
|
|
as a new element to the history, and, if necessary,
|
|
removing the oldest entry to keep the list to the created size.
|
|
If
|
|
.Dv H_SETUNIQUE
|
|
was has been called with a non-zero arguments, the element
|
|
will not be entered into the history if its contents match
|
|
the ones of the current history element.
|
|
If the element is entered
|
|
.Fn history
|
|
returns 1, if it is ignored as a duplicate returns 0.
|
|
Finally
|
|
.Fn history
|
|
returns \-1 if an error occurred.
|
|
.It Dv H_PREV_STR , Fa "const char *str"
|
|
Return the closest previous event that starts with
|
|
.Fa str .
|
|
.It Dv H_NEXT_STR , Fa "const char *str"
|
|
Return the closest next event that starts with
|
|
.Fa str .
|
|
.It Dv H_PREV_EVENT , Fa "int e"
|
|
Return the previous event numbered
|
|
.Fa e .
|
|
.It Dv H_NEXT_EVENT , Fa "int e"
|
|
Return the next event numbered
|
|
.Fa e .
|
|
.It Dv H_LOAD , Fa "const char *file"
|
|
Load the history list stored in
|
|
.Fa file .
|
|
.It Dv H_SAVE , Fa "const char *file"
|
|
Save the history list to
|
|
.Fa file .
|
|
.It Dv H_SETUNIQUE , Fa "int unique"
|
|
Set flag that adjacent identical event strings should not be entered
|
|
into the history.
|
|
.It Dv H_GETUNIQUE
|
|
Retrieve the current setting if adjacent identical elements should
|
|
be entered into the history.
|
|
.It Dv H_DEL , Fa "int num"
|
|
Delete the event numbered
|
|
.Fa e .
|
|
This function is only provided for
|
|
.Xr readline 3
|
|
compatibility.
|
|
The caller is responsible for free'ing the string in the returned
|
|
.Fa HistEvent .
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fn history
|
|
function returns \*[Ge] 0 if the operation
|
|
.Fa op
|
|
succeeds.
|
|
Otherwise, \-1 is returned and
|
|
.Fa ev
|
|
is updated to contain more details about the error.
|
|
.El
|
|
.Sh TOKENIZATION FUNCTIONS
|
|
The tokenization functions use a common data structure,
|
|
.Fa Tokenizer ,
|
|
which is created by
|
|
.Fn tok_init
|
|
and freed by
|
|
.Fn tok_end .
|
|
.Pp
|
|
The following functions are available:
|
|
.Bl -tag -width 4n
|
|
.It Fn tok_init
|
|
Initialise the tokenizer, and return a data structure
|
|
to be used by all other tokenizer functions.
|
|
.Fa IFS
|
|
contains the Input Field Separators, which defaults to
|
|
.Aq space ,
|
|
.Aq tab ,
|
|
and
|
|
.Aq newline
|
|
if
|
|
.Dv NULL .
|
|
.It Fn tok_end
|
|
Clean up and finish with
|
|
.Fa t ,
|
|
assumed to have been created with
|
|
.Fn tok_init .
|
|
.It Fn tok_reset
|
|
Reset the tokenizer state.
|
|
Use after a line has been successfully tokenized
|
|
by
|
|
.Fn tok_line
|
|
or
|
|
.Fn tok_str
|
|
and before a new line is to be tokenized.
|
|
.It Fn tok_line
|
|
Tokenize
|
|
.Fa li ,
|
|
If successful, modify:
|
|
.Fa argv
|
|
to contain the words,
|
|
.Fa argc
|
|
to contain the number of words,
|
|
.Fa cursorc
|
|
(if not
|
|
.Dv NULL )
|
|
to contain the index of the word containing the cursor,
|
|
and
|
|
.Fa cursoro
|
|
(if not
|
|
.Dv NULL )
|
|
to contain the offset within
|
|
.Fa argv[cursorc]
|
|
of the cursor.
|
|
.Pp
|
|
Returns
|
|
0 if successful,
|
|
\-1 for an internal error,
|
|
1 for an unmatched single quote,
|
|
2 for an unmatched double quote,
|
|
and
|
|
3 for a backslash quoted
|
|
.Aq newline .
|
|
A positive exit code indicates that another line should be read
|
|
and tokenization attempted again.
|
|
.It Fn tok_str
|
|
A simpler form of
|
|
.Fn tok_line ;
|
|
.Fa str
|
|
is a NUL terminated string to tokenize.
|
|
.El
|
|
.\"XXX.Sh EXAMPLES
|
|
.\"XXX: provide some examples
|
|
.Sh SEE ALSO
|
|
.Xr sh 1 ,
|
|
.Xr signal 3 ,
|
|
.Xr termcap 3 ,
|
|
.Xr editrc 5
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
library first appeared in
|
|
.Bx 4.4 .
|
|
.Dv CC_REDISPLAY
|
|
appeared in
|
|
.Nx 1.3 .
|
|
.Dv CC_REFRESH_BEEP
|
|
and
|
|
.Dv EL_EDITMODE
|
|
appeared in
|
|
.Nx 1.4 .
|
|
.Dv EL_RPROMPT
|
|
appeared in
|
|
.Nx 1.5 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm
|
|
library was written by
|
|
.An Christos Zoulas .
|
|
.An Luke Mewburn
|
|
wrote this manual and implemented
|
|
.Dv CC_REDISPLAY ,
|
|
.Dv CC_REFRESH_BEEP ,
|
|
.Dv EL_EDITMODE ,
|
|
and
|
|
.Dv EL_RPROMPT .
|
|
.Sh BUGS
|
|
At this time, it is the responsibility of the caller to
|
|
check the result of the
|
|
.Dv EL_EDITMODE
|
|
operation of
|
|
.Fn el_get
|
|
(after an
|
|
.Fn el_source
|
|
or
|
|
.Fn el_parse )
|
|
to determine if
|
|
.Nm
|
|
should be used for further input.
|
|
I.e.,
|
|
.Dv EL_EDITMODE
|
|
is purely an indication of the result of the most recent
|
|
.Xr editrc 5
|
|
.Ic edit
|
|
command.
|