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| Current File : //usr/src/contrib/nvi/vi/v_ex.c |
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)v_ex.c 10.42 (Berkeley) 6/28/96";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../common/common.h"
#include "vi.h"
static int v_ecl __P((SCR *));
static int v_ecl_init __P((SCR *));
static int v_ecl_log __P((SCR *, TEXT *));
static int v_ex_done __P((SCR *, VICMD *));
static int v_exec_ex __P((SCR *, VICMD *, EXCMD *));
/*
* v_again -- &
* Repeat the previous substitution.
*
* PUBLIC: int v_again __P((SCR *, VICMD *));
*/
int
v_again(sp, vp)
SCR *sp;
VICMD *vp;
{
ARGS *ap[2], a;
EXCMD cmd;
ex_cinit(&cmd, C_SUBAGAIN, 2, vp->m_start.lno, vp->m_start.lno, 1, ap);
ex_cadd(&cmd, &a, "", 1);
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_exmode -- Q
* Switch the editor into EX mode.
*
* PUBLIC: int v_exmode __P((SCR *, VICMD *));
*/
int
v_exmode(sp, vp)
SCR *sp;
VICMD *vp;
{
GS *gp;
gp = sp->gp;
/* Try and switch screens -- the screen may not permit it. */
if (gp->scr_screen(sp, SC_EX)) {
msgq(sp, M_ERR,
"207|The Q command requires the ex terminal interface");
return (1);
}
(void)gp->scr_attr(sp, SA_ALTERNATE, 0);
/* Save the current cursor position. */
sp->frp->lno = sp->lno;
sp->frp->cno = sp->cno;
F_SET(sp->frp, FR_CURSORSET);
/* Switch to ex mode. */
F_CLR(sp, SC_VI | SC_SCR_VI);
F_SET(sp, SC_EX);
/* Move out of the vi screen. */
(void)ex_puts(sp, "\n");
return (0);
}
/*
* v_join -- [count]J
* Join lines together.
*
* PUBLIC: int v_join __P((SCR *, VICMD *));
*/
int
v_join(sp, vp)
SCR *sp;
VICMD *vp;
{
EXCMD cmd;
int lno;
/*
* YASC.
* The general rule is that '#J' joins # lines, counting the current
* line. However, 'J' and '1J' are the same as '2J', i.e. join the
* current and next lines. This doesn't map well into the ex command
* (which takes two line numbers), so we handle it here. Note that
* we never test for EOF -- historically going past the end of file
* worked just fine.
*/
lno = vp->m_start.lno + 1;
if (F_ISSET(vp, VC_C1SET) && vp->count > 2)
lno = vp->m_start.lno + (vp->count - 1);
ex_cinit(&cmd, C_JOIN, 2, vp->m_start.lno, lno, 0, NULL);
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_shiftl -- [count]<motion
* Shift lines left.
*
* PUBLIC: int v_shiftl __P((SCR *, VICMD *));
*/
int
v_shiftl(sp, vp)
SCR *sp;
VICMD *vp;
{
ARGS *ap[2], a;
EXCMD cmd;
ex_cinit(&cmd, C_SHIFTL, 2, vp->m_start.lno, vp->m_stop.lno, 0, ap);
ex_cadd(&cmd, &a, "<", 1);
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_shiftr -- [count]>motion
* Shift lines right.
*
* PUBLIC: int v_shiftr __P((SCR *, VICMD *));
*/
int
v_shiftr(sp, vp)
SCR *sp;
VICMD *vp;
{
ARGS *ap[2], a;
EXCMD cmd;
ex_cinit(&cmd, C_SHIFTR, 2, vp->m_start.lno, vp->m_stop.lno, 0, ap);
ex_cadd(&cmd, &a, ">", 1);
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_suspend -- ^Z
* Suspend vi.
*
* PUBLIC: int v_suspend __P((SCR *, VICMD *));
*/
int
v_suspend(sp, vp)
SCR *sp;
VICMD *vp;
{
ARGS *ap[2], a;
EXCMD cmd;
ex_cinit(&cmd, C_STOP, 0, OOBLNO, OOBLNO, 0, ap);
ex_cadd(&cmd, &a, "suspend", sizeof("suspend") - 1);
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_switch -- ^^
* Switch to the previous file.
*
* PUBLIC: int v_switch __P((SCR *, VICMD *));
*/
int
v_switch(sp, vp)
SCR *sp;
VICMD *vp;
{
ARGS *ap[2], a;
EXCMD cmd;
char *name;
/*
* Try the alternate file name, then the previous file
* name. Use the real name, not the user's current name.
*/
if ((name = sp->alt_name) == NULL) {
msgq(sp, M_ERR, "180|No previous file to edit");
return (1);
}
/* If autowrite is set, write out the file. */
if (file_m1(sp, 0, FS_ALL))
return (1);
ex_cinit(&cmd, C_EDIT, 0, OOBLNO, OOBLNO, 0, ap);
ex_cadd(&cmd, &a, name, strlen(name));
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_tagpush -- ^[
* Do a tag search on the cursor keyword.
*
* PUBLIC: int v_tagpush __P((SCR *, VICMD *));
*/
int
v_tagpush(sp, vp)
SCR *sp;
VICMD *vp;
{
ARGS *ap[2], a;
EXCMD cmd;
#ifdef GTAGS
if (O_ISSET(sp, O_GTAGSMODE) && vp->m_start.cno == 0)
ex_cinit(&cmd, C_RTAG, 0, OOBLNO, 0, 0, ap);
else
#endif
ex_cinit(&cmd, C_TAG, 0, OOBLNO, 0, 0, ap);
ex_cadd(&cmd, &a, VIP(sp)->keyw, strlen(VIP(sp)->keyw));
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_tagpop -- ^T
* Pop the tags stack.
*
* PUBLIC: int v_tagpop __P((SCR *, VICMD *));
*/
int
v_tagpop(sp, vp)
SCR *sp;
VICMD *vp;
{
EXCMD cmd;
ex_cinit(&cmd, C_TAGPOP, 0, OOBLNO, 0, 0, NULL);
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_filter -- [count]!motion command(s)
* Run range through shell commands, replacing text.
*
* PUBLIC: int v_filter __P((SCR *, VICMD *));
*/
int
v_filter(sp, vp)
SCR *sp;
VICMD *vp;
{
EXCMD cmd;
TEXT *tp;
/*
* !!!
* Historical vi permitted "!!" in an empty file, and it's handled
* as a special case in the ex_bang routine. Don't modify this setup
* without understanding that one. In particular, note that we're
* manipulating the ex argument structures behind ex's back.
*
* !!!
* Historical vi did not permit the '!' command to be associated with
* a non-line oriented motion command, in general, although it did
* with search commands. So, !f; and !w would fail, but !/;<CR>
* would succeed, even if they all moved to the same location in the
* current line. I don't see any reason to disallow '!' using any of
* the possible motion commands.
*
* !!!
* Historical vi ran the last bang command if N or n was used as the
* search motion.
*/
if (F_ISSET(vp, VC_ISDOT) ||
ISCMD(vp->rkp, 'N') || ISCMD(vp->rkp, 'n')) {
ex_cinit(&cmd, C_BANG,
2, vp->m_start.lno, vp->m_stop.lno, 0, NULL);
EXP(sp)->argsoff = 0; /* XXX */
if (argv_exp1(sp, &cmd, "!", 1, 1))
return (1);
cmd.argc = EXP(sp)->argsoff; /* XXX */
cmd.argv = EXP(sp)->args; /* XXX */
return (v_exec_ex(sp, vp, &cmd));
}
/* Get the command from the user. */
if (v_tcmd(sp, vp,
'!', TXT_BS | TXT_CR | TXT_ESCAPE | TXT_FILEC | TXT_PROMPT))
return (1);
/*
* Check to see if the user changed their mind.
*
* !!!
* Entering <escape> on an empty line was historically an error,
* this implementation doesn't bother.
*/
tp = sp->tiq.cqh_first;
if (tp->term != TERM_OK) {
vp->m_final.lno = sp->lno;
vp->m_final.cno = sp->cno;
return (0);
}
/* Home the cursor. */
vs_home(sp);
ex_cinit(&cmd, C_BANG, 2, vp->m_start.lno, vp->m_stop.lno, 0, NULL);
EXP(sp)->argsoff = 0; /* XXX */
if (argv_exp1(sp, &cmd, tp->lb + 1, tp->len - 1, 1))
return (1);
cmd.argc = EXP(sp)->argsoff; /* XXX */
cmd.argv = EXP(sp)->args; /* XXX */
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_event_exec --
* Execute some command(s) based on an event.
*
* PUBLIC: int v_event_exec __P((SCR *, VICMD *));
*/
int
v_event_exec(sp, vp)
SCR *sp;
VICMD *vp;
{
EXCMD cmd;
switch (vp->ev.e_event) {
case E_QUIT:
ex_cinit(&cmd, C_QUIT, 0, OOBLNO, OOBLNO, 0, NULL);
break;
case E_WRITE:
ex_cinit(&cmd, C_WRITE, 0, OOBLNO, OOBLNO, 0, NULL);
break;
default:
abort();
}
return (v_exec_ex(sp, vp, &cmd));
}
/*
* v_exec_ex --
* Execute an ex command.
*/
static int
v_exec_ex(sp, vp, exp)
SCR *sp;
VICMD *vp;
EXCMD *exp;
{
int rval;
rval = exp->cmd->fn(sp, exp);
return (v_ex_done(sp, vp) || rval);
}
/*
* v_ex -- :
* Execute a colon command line.
*
* PUBLIC: int v_ex __P((SCR *, VICMD *));
*/
int
v_ex(sp, vp)
SCR *sp;
VICMD *vp;
{
GS *gp;
TEXT *tp;
int do_cedit, do_resolution, ifcontinue;
gp = sp->gp;
/*
* !!!
* If we put out more than a single line of messages, or ex trashes
* the screen, the user may continue entering ex commands. We find
* this out when we do the screen/message resolution. We can't enter
* completely into ex mode however, because the user can elect to
* return into vi mode by entering any key, i.e. we have to be in raw
* mode.
*/
for (do_cedit = do_resolution = 0;;) {
/*
* !!!
* There may already be an ex command waiting to run. If
* so, we continue with it.
*/
if (!EXCMD_RUNNING(gp)) {
/* Get a command. */
if (v_tcmd(sp, vp, ':',
TXT_BS | TXT_CEDIT | TXT_FILEC | TXT_PROMPT))
return (1);
tp = sp->tiq.cqh_first;
/*
* If the user entered a single <esc>, they want to
* edit their colon command history. If they already
* entered some text, move it into the edit history.
*/
if (tp->term == TERM_CEDIT) {
if (tp->len > 1 && v_ecl_log(sp, tp))
return (1);
do_cedit = 1;
break;
}
/* If the user didn't enter anything, return. */
if (tp->term == TERM_BS)
break;
/* If the user changed their mind, return. */
if (tp->term != TERM_OK)
break;
/* Log the command. */
if (O_STR(sp, O_CEDIT) != NULL && v_ecl_log(sp, tp))
return (1);
/* Push a command on the command stack. */
if (ex_run_str(sp, NULL, tp->lb, tp->len, 0, 1))
return (1);
}
/* Home the cursor. */
vs_home(sp);
/*
* !!!
* If the editor wrote the screen behind curses back, put out
* a <newline> so that we don't overwrite the user's command
* with its output or the next want-to-continue? message. This
* doesn't belong here, but I can't find another place to put
* it. See, we resolved the output from the last ex command,
* and the user entered another one. This is the only place
* where we have control before the ex command writes output.
* We could get control in vs_msg(), but we have no way to know
* if command didn't put out any output when we try and resolve
* this command. This fixes a bug where combinations of ex
* commands, e.g. ":set<CR>:!date<CR>:set" didn't look right.
*/
if (F_ISSET(sp, SC_SCR_EXWROTE))
(void)putchar('\n');
/* Call the ex parser. */
(void)ex_cmd(sp);
/* Flush ex messages. */
(void)ex_fflush(sp);
/* Resolve any messages. */
if (vs_ex_resolve(sp, &ifcontinue))
return (1);
/*
* Continue or return. If continuing, make sure that we
* eventually do resolution.
*/
if (!ifcontinue)
break;
do_resolution = 1;
/* If we're continuing, it's a new command. */
++sp->ccnt;
}
/*
* If the user previously continued an ex command, we have to do
* resolution to clean up the screen. Don't wait, we already did
* that.
*/
if (do_resolution) {
F_SET(sp, SC_EX_WAIT_NO);
if (vs_ex_resolve(sp, &ifcontinue))
return (1);
}
/* Cleanup from the ex command. */
if (v_ex_done(sp, vp))
return (1);
/* The user may want to edit their colon command history. */
if (do_cedit)
return (v_ecl(sp));
return (0);
}
/*
* v_ex_done --
* Cleanup from an ex command.
*/
static int
v_ex_done(sp, vp)
SCR *sp;
VICMD *vp;
{
size_t len;
/*
* The only cursor modifications are real, however, the underlying
* line may have changed; don't trust anything. This code has been
* a remarkably fertile place for bugs. Do a reality check on a
* cursor value, and make sure it's okay. If necessary, change it.
* Ex keeps track of the line number, but it cares less about the
* column and it may have disappeared.
*
* Don't trust ANYTHING.
*
* XXX
* Ex will soon have to start handling the column correctly; see
* the POSIX 1003.2 standard.
*/
if (db_eget(sp, sp->lno, NULL, &len, NULL)) {
sp->lno = 1;
sp->cno = 0;
} else if (sp->cno >= len)
sp->cno = len ? len - 1 : 0;
vp->m_final.lno = sp->lno;
vp->m_final.cno = sp->cno;
/*
* Don't re-adjust the cursor after executing an ex command,
* and ex movements are permanent.
*/
F_CLR(vp, VM_RCM_MASK);
F_SET(vp, VM_RCM_SET);
return (0);
}
/*
* v_ecl --
* Start an edit window on the colon command-line commands.
*/
static int
v_ecl(sp)
SCR *sp;
{
GS *gp;
SCR *new;
/* Initialize the screen, if necessary. */
gp = sp->gp;
if (gp->ccl_sp == NULL && v_ecl_init(sp))
return (1);
/* Get a new screen. */
if (screen_init(gp, sp, &new))
return (1);
if (vs_split(sp, new, 1)) {
(void)screen_end(new);
return (1);
}
/* Attach to the screen. */
new->ep = gp->ccl_sp->ep;
++new->ep->refcnt;
new->frp = gp->ccl_sp->frp;
new->frp->flags = sp->frp->flags;
/* Move the cursor to the end. */
(void)db_last(new, &new->lno);
if (new->lno == 0)
new->lno = 1;
/* Remember the originating window. */
sp->ccl_parent = sp;
/* It's a special window. */
F_SET(new, SC_COMEDIT);
/* Set up the switch. */
sp->nextdisp = new;
F_SET(sp, SC_SSWITCH);
return (0);
}
/*
* v_ecl_exec --
* Execute a command from a colon command-line window.
*
* PUBLIC: int v_ecl_exec __P((SCR *));
*/
int
v_ecl_exec(sp)
SCR *sp;
{
size_t len;
char *p;
if (db_get(sp, sp->lno, 0, &p, &len) && sp->lno == 1) {
v_emsg(sp, NULL, VIM_EMPTY);
return (1);
}
if (len == 0) {
msgq(sp, M_BERR, "307|No ex command to execute");
return (1);
}
/* Push the command on the command stack. */
if (ex_run_str(sp, NULL, p, len, 0, 0))
return (1);
/* Set up the switch. */
sp->nextdisp = sp->ccl_parent;
F_SET(sp, SC_EXIT);
return (0);
}
/*
* v_ecl_log --
* Log a command into the colon command-line log file.
*/
static int
v_ecl_log(sp, tp)
SCR *sp;
TEXT *tp;
{
EXF *save_ep;
recno_t lno;
int rval;
/* Initialize the screen, if necessary. */
if (sp->gp->ccl_sp == NULL && v_ecl_init(sp))
return (1);
/*
* Don't log colon command window commands into the colon command
* window...
*/
if (sp->ep == sp->gp->ccl_sp->ep)
return (0);
/*
* XXX
* Swap the current EXF with the colon command file EXF. This
* isn't pretty, but too many routines "know" that sp->ep points
* to the current EXF.
*/
save_ep = sp->ep;
sp->ep = sp->gp->ccl_sp->ep;
if (db_last(sp, &lno)) {
sp->ep = save_ep;
return (1);
}
rval = db_append(sp, 0, lno, tp->lb, tp->len);
sp->ep = save_ep;
return (rval);
}
/*
* v_ecl_init --
* Initialize the colon command-line log file.
*/
static int
v_ecl_init(sp)
SCR *sp;
{
FREF *frp;
GS *gp;
gp = sp->gp;
/* Get a temporary file. */
if ((frp = file_add(sp, NULL)) == NULL)
return (1);
/*
* XXX
* Create a screen -- the file initialization code wants one.
*/
if (screen_init(gp, sp, &gp->ccl_sp))
return (1);
if (file_init(gp->ccl_sp, frp, NULL, 0)) {
(void)screen_end(gp->ccl_sp);
return (1);
}
/* The underlying file isn't recoverable. */
F_CLR(gp->ccl_sp->ep, F_RCV_ON);
return (0);
}