533 lines
12 KiB
Groff
533 lines
12 KiB
Groff
.\" $NetBSD: editline.3,v 1.9 1998/02/05 18:51:37 perry Exp $
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.\"
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.\" Copyright (c) 1997 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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.Dd January 11, 1997
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.Os BSD 4.4
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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_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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.Nd line editor and history functions
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.Sh LIBRARY
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.Lb libedit
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.Sh SYNOPSIS
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.Fd #include <histedit.h>
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.Ft EditLine *
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.Fn el_init "const char *prog" "FILE *fin" "FILE *fout"
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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" "const char *str"
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.Ft int
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.Fn el_parse "EditLine *e" "int argc" "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_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" "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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.Sh DESCRIPTION
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The
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.Nm
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library provides generic line editing and history 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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and
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.Fa fout
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are the input and output 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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didn't 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_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_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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.El
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.It Fn el_source
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Initialise
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.Nm
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by reading the contents of
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.Fa file .
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.Fn el_parse
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is called for each line in
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.Fa file .
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If
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.Fa file
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is
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.Dv NULL ,
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try
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.Pa $PWD/.editrc
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then
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.Pa $HOME/.editrc .
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Refer to
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.Xr editrc 5
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for details on the format of
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.Fa file .
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.It Fn el_resize
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Must be called if the terminal size changes.
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If
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.Dv EL_SIGNAL
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has been set with
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.Fn el_set ,
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then this is done automatically.
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Otherwise, it's the responsibility of the application to call
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.Fn el_resize
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on the appropriate occasions.
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.It Fn el_line
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Return the editing information for the current line in a
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.Fa LineInfo
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structure, which is defined as follows:
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.Bd -literal
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typedef struct lineinfo {
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const char *buffer; /* address of buffer */
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const char *cursor; /* address of cursor */
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const char *lastchar; /* address of last character */
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} LineInfo;
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.Ed
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.It Fn el_insertstr
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Insert
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.Fa str
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into the line at the cursor.
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Returns -1 if
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.Fa str
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is empty or won't fit, and 0 otherwise.
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.It Fn el_deletestr
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Delete
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.Fa num
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characters before the cursor.
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.El
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.Sh HISTORY LIST FUNCTIONS
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The history functions use a common data structure,
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.Fa History ,
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which is created by
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.Fn history_init
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and freed by
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.Fn history_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 history_init
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Initialise the history list, and return a data structure
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to be used by all other history list functions.
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.It Fn history_end
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Clean up and finish with
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.Fa h ,
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assumed to have been created with
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.Fn history_init .
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.It Fn history
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Perform operation
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.Fa op
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on the history list, with optional arguments as needed by the
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operation.
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.Fa ev
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is changed accordingly to operation.
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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 H_SETMAXSIZE , Fa "int size"
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Set size of history to
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.Fa size
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elements.
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.It Dv H_GETSIZE
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Get number of events currently in history.
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.It Dv H_END
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Cleans up and finishes with
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.Fa h ,
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assumed to be created with
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.Fn history_init .
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.It Dv H_CLEAR
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Clear the history.
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.It Dv H_FUNC , Xo
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.Fa "void *ptr" ,
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.Fa "history_gfun_t first" ,
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.Fa "history_gfun_t next" ,
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.Fa "history_gfun_t last" ,
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.Fa "history_gfun_t prev" ,
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.Fa "history_gfun_t curr" ,
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.Fa "history_vfun_t clear" ,
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.Fa "history_efun_t enter" ,
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.Fa "history_efun_t add"
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.Xc
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Define functions to perform various history operations.
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.Fa ptr
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is the argument given to a function when it's invoked.
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.It Dv H_FIRST
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Return the first element in the history.
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.It Dv H_LAST
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Return the last element in the history.
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.It Dv H_PREV
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Return the previous element in the history.
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.It Dv H_NEXT
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Return the next element in the history.
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.It Dv H_CURR
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Return the current element in the history.
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.It Dv H_ADD , Fa "const char *str"
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Append
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.Fa str
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to the current element of the history, or create an element with
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.Dv H_ENTER
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if there isn't one.
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.It Dv H_ENTER , Fa "const char *str"
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Add
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.Fa str
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as a new element to the history, and, if necessary,
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removing the oldest entry to keep the list to the created size.
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.It Dv H_PREV_STR , Fa "const char *str"
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Return the closest previous event that starts with
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.Fa str .
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.It Dv H_NEXT_STR , Fa "const char *str"
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Return the closest next event that starts with
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.Fa str .
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.It Dv H_PREV_EVENT , Fa "int e"
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Return the previous event numbered
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.Fa e .
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.It Dv H_NEXT_EVENT , Fa "int e"
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Return the next event numbered
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.Fa e .
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.It Dv H_LOAD , Fa "const char *file"
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Load the history list stored in
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.Fa file .
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.It Dv H_SAVE , Fa "const char *file"
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Save the history list to
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.Fa file .
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.El
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.Pp
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.Fn history
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returns 0 if the operation
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.Fa op
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succeeds. Otherwise, -1 is returned and
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.Fa ev
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is updated to contain more details about the error.
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.El
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.\"XXX.Sh EXAMPLES
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.\"XXX: provide some examples
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.Sh SEE ALSO
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.Xr editrc 5 ,
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.Xr sh 1 ,
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.Xr signal 3 ,
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.Xr termcap 3
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|
.Sh HISTORY
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The
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.Nm
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library first appeared in
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.Bx 4.4 .
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.Sh AUTHORS
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The
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.Nm
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library was written by Christos Zoulas,
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and this manual was written by Luke Mewburn.
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.Sh BUGS
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This documentation is probably incomplete.
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.Pp
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.Fn el_parse
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should not modify the supplied
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.Va argv[0] .
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.Pp
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The tokenization functions are not publically defined in
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.Fd <histedit.h>
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