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NetBSD/lib/libedit/emacs.c
christos 39f224af48 PR/18995: David Laight: libedit fixes for posix conformant sh 
The posix 'sh' specification defines vi-mode editing quite tightly.
The netbsd libedit code (used by sh to do this) was missing several
features, there were also minor errors in others.

Compare netbsd sh to the definition available from:
http://www.opengroup.org/onlinepubs/007904975/utilities/sh.html
In particular the following were not supported:
	U - undo all changes to line
	| - goto column
	Y - yank to end of line
	y - yank
	# - comment out current line
	@ - take input from shell alias [1]
	G - goto numbered line in history buffer
	v - edit history line with vi
	_ - append word from last input line
	. - redo last command
Other minor changes have also been made.

[1] This needs the shell to define an appropriate routine to
return the text of the alias.  There is no requirement that
such a function exist.
2002-11-15 14:32:32 +00:00

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/* $NetBSD: emacs.c,v 1.12 2002/11/15 14:32:33 christos Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Christos Zoulas of Cornell University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)emacs.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: emacs.c,v 1.12 2002/11/15 14:32:33 christos Exp $");
#endif
#endif /* not lint && not SCCSID */
/*
* emacs.c: Emacs functions
*/
#include "el.h"
/* em_delete_or_list():
* Delete character under cursor or list completions if at end of line
* [^D]
*/
protected el_action_t
/*ARGSUSED*/
em_delete_or_list(EditLine *el, int c)
{
if (el->el_line.cursor == el->el_line.lastchar) {
/* if I'm at the end */
if (el->el_line.cursor == el->el_line.buffer) {
/* and the beginning */
term_overwrite(el, STReof, 4); /* then do a EOF */
term__flush();
return (CC_EOF);
} else {
/*
* Here we could list completions, but it is an
* error right now
*/
term_beep(el);
return (CC_ERROR);
}
} else {
c_delafter(el, el->el_state.argument); /* delete after dot */
if (el->el_line.cursor > el->el_line.lastchar)
el->el_line.cursor = el->el_line.lastchar;
/* bounds check */
return (CC_REFRESH);
}
}
/* em_delete_next_word():
* Cut from cursor to end of current word
* [M-d]
*/
protected el_action_t
/*ARGSUSED*/
em_delete_next_word(EditLine *el, int c)
{
char *cp, *p, *kp;
if (el->el_line.cursor == el->el_line.lastchar)
return (CC_ERROR);
cp = c__next_word(el->el_line.cursor, el->el_line.lastchar,
el->el_state.argument, ce__isword);
for (p = el->el_line.cursor, kp = el->el_chared.c_kill.buf; p < cp; p++)
/* save the text */
*kp++ = *p;
el->el_chared.c_kill.last = kp;
c_delafter(el, cp - el->el_line.cursor); /* delete after dot */
if (el->el_line.cursor > el->el_line.lastchar)
el->el_line.cursor = el->el_line.lastchar;
/* bounds check */
return (CC_REFRESH);
}
/* em_yank():
* Paste cut buffer at cursor position
* [^Y]
*/
protected el_action_t
/*ARGSUSED*/
em_yank(EditLine *el, int c)
{
char *kp, *cp;
if (el->el_chared.c_kill.last == el->el_chared.c_kill.buf) {
if (!ch_enlargebufs(el, 1))
return (CC_ERROR);
}
if (el->el_line.lastchar +
(el->el_chared.c_kill.last - el->el_chared.c_kill.buf) >=
el->el_line.limit)
return (CC_ERROR);
el->el_chared.c_kill.mark = el->el_line.cursor;
cp = el->el_line.cursor;
/* open the space, */
c_insert(el, el->el_chared.c_kill.last - el->el_chared.c_kill.buf);
/* copy the chars */
for (kp = el->el_chared.c_kill.buf; kp < el->el_chared.c_kill.last; kp++)
*cp++ = *kp;
/* if an arg, cursor at beginning else cursor at end */
if (el->el_state.argument == 1)
el->el_line.cursor = cp;
return (CC_REFRESH);
}
/* em_kill_line():
* Cut the entire line and save in cut buffer
* [^U]
*/
protected el_action_t
/*ARGSUSED*/
em_kill_line(EditLine *el, int c)
{
char *kp, *cp;
cp = el->el_line.buffer;
kp = el->el_chared.c_kill.buf;
while (cp < el->el_line.lastchar)
*kp++ = *cp++; /* copy it */
el->el_chared.c_kill.last = kp;
/* zap! -- delete all of it */
el->el_line.lastchar = el->el_line.buffer;
el->el_line.cursor = el->el_line.buffer;
return (CC_REFRESH);
}
/* em_kill_region():
* Cut area between mark and cursor and save in cut buffer
* [^W]
*/
protected el_action_t
/*ARGSUSED*/
em_kill_region(EditLine *el, int c)
{
char *kp, *cp;
if (!el->el_chared.c_kill.mark)
return (CC_ERROR);
if (el->el_chared.c_kill.mark > el->el_line.cursor) {
cp = el->el_line.cursor;
kp = el->el_chared.c_kill.buf;
while (cp < el->el_chared.c_kill.mark)
*kp++ = *cp++; /* copy it */
el->el_chared.c_kill.last = kp;
c_delafter(el, cp - el->el_line.cursor);
} else { /* mark is before cursor */
cp = el->el_chared.c_kill.mark;
kp = el->el_chared.c_kill.buf;
while (cp < el->el_line.cursor)
*kp++ = *cp++; /* copy it */
el->el_chared.c_kill.last = kp;
c_delbefore(el, cp - el->el_chared.c_kill.mark);
el->el_line.cursor = el->el_chared.c_kill.mark;
}
return (CC_REFRESH);
}
/* em_copy_region():
* Copy area between mark and cursor to cut buffer
* [M-W]
*/
protected el_action_t
/*ARGSUSED*/
em_copy_region(EditLine *el, int c)
{
char *kp, *cp;
if (!el->el_chared.c_kill.mark)
return (CC_ERROR);
if (el->el_chared.c_kill.mark > el->el_line.cursor) {
cp = el->el_line.cursor;
kp = el->el_chared.c_kill.buf;
while (cp < el->el_chared.c_kill.mark)
*kp++ = *cp++; /* copy it */
el->el_chared.c_kill.last = kp;
} else {
cp = el->el_chared.c_kill.mark;
kp = el->el_chared.c_kill.buf;
while (cp < el->el_line.cursor)
*kp++ = *cp++; /* copy it */
el->el_chared.c_kill.last = kp;
}
return (CC_NORM);
}
/* em_gosmacs_traspose():
* Exchange the two characters before the cursor
* Gosling emacs transpose chars [^T]
*/
protected el_action_t
em_gosmacs_traspose(EditLine *el, int c)
{
if (el->el_line.cursor > &el->el_line.buffer[1]) {
/* must have at least two chars entered */
c = el->el_line.cursor[-2];
el->el_line.cursor[-2] = el->el_line.cursor[-1];
el->el_line.cursor[-1] = c;
return (CC_REFRESH);
} else
return (CC_ERROR);
}
/* em_next_word():
* Move next to end of current word
* [M-f]
*/
protected el_action_t
/*ARGSUSED*/
em_next_word(EditLine *el, int c)
{
if (el->el_line.cursor == el->el_line.lastchar)
return (CC_ERROR);
el->el_line.cursor = c__next_word(el->el_line.cursor,
el->el_line.lastchar,
el->el_state.argument,
ce__isword);
if (el->el_map.type == MAP_VI)
if (el->el_chared.c_vcmd.action != NOP) {
cv_delfini(el);
return (CC_REFRESH);
}
return (CC_CURSOR);
}
/* em_upper_case():
* Uppercase the characters from cursor to end of current word
* [M-u]
*/
protected el_action_t
/*ARGSUSED*/
em_upper_case(EditLine *el, int c)
{
char *cp, *ep;
ep = c__next_word(el->el_line.cursor, el->el_line.lastchar,
el->el_state.argument, ce__isword);
for (cp = el->el_line.cursor; cp < ep; cp++)
if (islower((unsigned char) *cp))
*cp = toupper(*cp);
el->el_line.cursor = ep;
if (el->el_line.cursor > el->el_line.lastchar)
el->el_line.cursor = el->el_line.lastchar;
return (CC_REFRESH);
}
/* em_capitol_case():
* Capitalize the characters from cursor to end of current word
* [M-c]
*/
protected el_action_t
/*ARGSUSED*/
em_capitol_case(EditLine *el, int c)
{
char *cp, *ep;
ep = c__next_word(el->el_line.cursor, el->el_line.lastchar,
el->el_state.argument, ce__isword);
for (cp = el->el_line.cursor; cp < ep; cp++) {
if (isalpha((unsigned char) *cp)) {
if (islower((unsigned char) *cp))
*cp = toupper(*cp);
cp++;
break;
}
}
for (; cp < ep; cp++)
if (isupper((unsigned char) *cp))
*cp = tolower(*cp);
el->el_line.cursor = ep;
if (el->el_line.cursor > el->el_line.lastchar)
el->el_line.cursor = el->el_line.lastchar;
return (CC_REFRESH);
}
/* em_lower_case():
* Lowercase the characters from cursor to end of current word
* [M-l]
*/
protected el_action_t
/*ARGSUSED*/
em_lower_case(EditLine *el, int c)
{
char *cp, *ep;
ep = c__next_word(el->el_line.cursor, el->el_line.lastchar,
el->el_state.argument, ce__isword);
for (cp = el->el_line.cursor; cp < ep; cp++)
if (isupper((unsigned char) *cp))
*cp = tolower(*cp);
el->el_line.cursor = ep;
if (el->el_line.cursor > el->el_line.lastchar)
el->el_line.cursor = el->el_line.lastchar;
return (CC_REFRESH);
}
/* em_set_mark():
* Set the mark at cursor
* [^@]
*/
protected el_action_t
/*ARGSUSED*/
em_set_mark(EditLine *el, int c)
{
el->el_chared.c_kill.mark = el->el_line.cursor;
return (CC_NORM);
}
/* em_exchange_mark():
* Exchange the cursor and mark
* [^X^X]
*/
protected el_action_t
/*ARGSUSED*/
em_exchange_mark(EditLine *el, int c)
{
char *cp;
cp = el->el_line.cursor;
el->el_line.cursor = el->el_chared.c_kill.mark;
el->el_chared.c_kill.mark = cp;
return (CC_CURSOR);
}
/* em_universal_argument():
* Universal argument (argument times 4)
* [^U]
*/
protected el_action_t
/*ARGSUSED*/
em_universal_argument(EditLine *el, int c)
{ /* multiply current argument by 4 */
if (el->el_state.argument > 1000000)
return (CC_ERROR);
el->el_state.doingarg = 1;
el->el_state.argument *= 4;
return (CC_ARGHACK);
}
/* em_meta_next():
* Add 8th bit to next character typed
* [<ESC>]
*/
protected el_action_t
/*ARGSUSED*/
em_meta_next(EditLine *el, int c)
{
el->el_state.metanext = 1;
return (CC_ARGHACK);
}
/* em_toggle_overwrite():
* Switch from insert to overwrite mode or vice versa
*/
protected el_action_t
/*ARGSUSED*/
em_toggle_overwrite(EditLine *el, int c)
{
el->el_state.inputmode = (el->el_state.inputmode == MODE_INSERT) ?
MODE_REPLACE : MODE_INSERT;
return (CC_NORM);
}
/* em_copy_prev_word():
* Copy current word to cursor
*/
protected el_action_t
/*ARGSUSED*/
em_copy_prev_word(EditLine *el, int c)
{
char *cp, *oldc, *dp;
if (el->el_line.cursor == el->el_line.buffer)
return (CC_ERROR);
oldc = el->el_line.cursor;
/* does a bounds check */
cp = c__prev_word(el->el_line.cursor, el->el_line.buffer,
el->el_state.argument, ce__isword);
c_insert(el, oldc - cp);
for (dp = oldc; cp < oldc && dp < el->el_line.lastchar; cp++)
*dp++ = *cp;
el->el_line.cursor = dp;/* put cursor at end */
return (CC_REFRESH);
}
/* em_inc_search_next():
* Emacs incremental next search
*/
protected el_action_t
/*ARGSUSED*/
em_inc_search_next(EditLine *el, int c)
{
el->el_search.patlen = 0;
return (ce_inc_search(el, ED_SEARCH_NEXT_HISTORY));
}
/* em_inc_search_prev():
* Emacs incremental reverse search
*/
protected el_action_t
/*ARGSUSED*/
em_inc_search_prev(EditLine *el, int c)
{
el->el_search.patlen = 0;
return (ce_inc_search(el, ED_SEARCH_PREV_HISTORY));
}
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