1/*-
2 * Copyright (c) 1992, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 *	Keith Bostic.  All rights reserved.
6 *
7 * See the LICENSE file for redistribution information.
8 */
9
10#include "config.h"
11
12#ifndef lint
13static const char sccsid[] = "$Id: ex_bang.c,v 10.36 2001/06/25 15:19:14 skimo Exp $";
14#endif /* not lint */
15
16#include <sys/types.h>
17#include <sys/queue.h>
18#include <sys/time.h>
19
20#include <bitstring.h>
21#include <errno.h>
22#include <limits.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <unistd.h>
27
28#include "../common/common.h"
29#include "../vi/vi.h"
30
31/*
32 * ex_bang -- :[line [,line]] ! command
33 *
34 * Pass the rest of the line after the ! character to the program named by
35 * the O_SHELL option.
36 *
37 * Historical vi did NOT do shell expansion on the arguments before passing
38 * them, only file name expansion.  This means that the O_SHELL program got
39 * "$t" as an argument if that is what the user entered.  Also, there's a
40 * special expansion done for the bang command.  Any exclamation points in
41 * the user's argument are replaced by the last, expanded ! command.
42 *
43 * There's some fairly amazing slop in this routine to make the different
44 * ways of getting here display the right things.  It took a long time to
45 * get it right (wrong?), so be careful.
46 *
47 * PUBLIC: int ex_bang __P((SCR *, EXCMD *));
48 */
49int
50ex_bang(SCR *sp, EXCMD *cmdp)
51{
52	enum filtertype ftype;
53	ARGS *ap;
54	EX_PRIVATE *exp;
55	MARK rm;
56	recno_t lno;
57	int rval;
58	const char *msg;
59	char *np;
60	size_t nlen;
61
62	ap = cmdp->argv[0];
63	if (ap->len == 0) {
64		ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
65		return (1);
66	}
67
68	/* Set the "last bang command" remembered value. */
69	exp = EXP(sp);
70	if (exp->lastbcomm != NULL)
71		free(exp->lastbcomm);
72	if ((exp->lastbcomm = v_wstrdup(sp, ap->bp, ap->len)) == NULL) {
73		msgq(sp, M_SYSERR, NULL);
74		return (1);
75	}
76
77	/*
78	 * If the command was modified by the expansion, it was historically
79	 * redisplayed.
80	 */
81	if (F_ISSET(cmdp, E_MODIFY) && !F_ISSET(sp, SC_EX_SILENT)) {
82		/*
83		 * Display the command if modified.  Historic ex/vi displayed
84		 * the command if it was modified due to file name and/or bang
85		 * expansion.  If piping lines in vi, it would be immediately
86		 * overwritten by any error or line change reporting.
87		 */
88		if (F_ISSET(sp, SC_VI))
89			vs_update(sp, "!", ap->bp);
90		else {
91			(void)ex_printf(sp, "!"WS"\n", ap->bp);
92			(void)ex_fflush(sp);
93		}
94	}
95
96	/*
97	 * If no addresses were specified, run the command.  If there's an
98	 * underlying file, it's been modified and autowrite is set, write
99	 * the file back.  If the file has been modified, autowrite is not
100	 * set and the warn option is set, tell the user about the file.
101	 */
102	if (cmdp->addrcnt == 0) {
103		msg = NULL;
104		if (sp->ep != NULL && F_ISSET(sp->ep, F_MODIFIED))
105			if (O_ISSET(sp, O_AUTOWRITE)) {
106				if (file_aw(sp, FS_ALL))
107					return (0);
108			} else if (O_ISSET(sp, O_WARN) &&
109			    !F_ISSET(sp, SC_EX_SILENT))
110				msg = msg_cat(sp,
111				    "303|File modified since last write.",
112				    NULL);
113
114		/* If we're still in a vi screen, move out explicitly. */
115		INT2CHAR(sp, ap->bp, ap->len+1, np, nlen);
116		(void)ex_exec_proc(sp,
117		    cmdp, np, msg, !F_ISSET(sp, SC_EX | SC_SCR_EXWROTE));
118	}
119
120	/*
121	 * If addresses were specified, pipe lines from the file through the
122	 * command.
123	 *
124	 * Historically, vi lines were replaced by both the stdout and stderr
125	 * lines of the command, but ex lines by only the stdout lines.  This
126	 * makes no sense to me, so nvi makes it consistent for both, and
127	 * matches vi's historic behavior.
128	 */
129	else {
130		NEEDFILE(sp, cmdp);
131
132		/* Autoprint is set historically, even if the command fails. */
133		F_SET(cmdp, E_AUTOPRINT);
134
135		/*
136		 * !!!
137		 * Historical vi permitted "!!" in an empty file.  When this
138		 * happens, we arrive here with two addresses of 1,1 and a
139		 * bad attitude.  The simple solution is to turn it into a
140		 * FILTER_READ operation, with the exception that stdin isn't
141		 * opened for the utility, and the cursor position isn't the
142		 * same.  The only historic glitch (I think) is that we don't
143		 * put an empty line into the default cut buffer, as historic
144		 * vi did.  Imagine, if you can, my disappointment.
145		 */
146		ftype = FILTER_BANG;
147		if (cmdp->addr1.lno == 1 && cmdp->addr2.lno == 1) {
148			if (db_last(sp, &lno))
149				return (1);
150			if (lno == 0) {
151				cmdp->addr1.lno = cmdp->addr2.lno = 0;
152				ftype = FILTER_RBANG;
153			}
154		}
155		rval = ex_filter(sp, cmdp,
156		    &cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype);
157
158		/*
159		 * If in vi mode, move to the first nonblank.
160		 *
161		 * !!!
162		 * Historic vi wasn't consistent in this area -- if you used
163		 * a forward motion it moved to the first nonblank, but if you
164		 * did a backward motion it didn't.  And, if you followed a
165		 * backward motion with a forward motion, it wouldn't move to
166		 * the nonblank for either.  Going to the nonblank generally
167		 * seems more useful and consistent, so we do it.
168		 */
169		sp->lno = rm.lno;
170		if (F_ISSET(sp, SC_VI)) {
171			sp->cno = 0;
172			(void)nonblank(sp, sp->lno, &sp->cno);
173		} else
174			sp->cno = rm.cno;
175	}
176
177	/* Ex terminates with a bang, even if the command fails. */
178	if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT))
179		(void)ex_puts(sp, "!\n");
180
181	/*
182	 * XXX
183	 * The ! commands never return an error, so that autoprint always
184	 * happens in the ex parser.
185	 */
186	return (0);
187}
188