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