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.
7 * See the LICENSE file for redistribution information.
13 static const char sccsid
[] = "$Id: ex_bang.c,v 10.35 2000/07/14 14:29:20 skimo Exp $ (Berkeley) $Date: 2000/07/14 14:29:20 $";
16 #include <sys/types.h>
17 #include <sys/queue.h>
20 #include <bitstring.h>
28 #include "../common/common.h"
32 * ex_bang -- :[line [,line]] ! command
34 * Pass the rest of the line after the ! character to the program named by
37 * Historical vi did NOT do shell expansion on the arguments before passing
38 * them, only file name expansion. This means that the O_SHELL program got
39 * "$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.
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.
47 * PUBLIC: int ex_bang __P((SCR *, EXCMD *));
54 enum filtertype ftype
;
66 ex_emsg(sp
, cmdp
->cmd
->usage
, EXM_USAGE
);
70 /* Set the "last bang command" remembered value. */
72 if (exp
->lastbcomm
!= NULL
)
74 if ((exp
->lastbcomm
= v_wstrdup(sp
, ap
->bp
, ap
->len
)) == NULL
) {
75 msgq(sp
, M_SYSERR
, NULL
);
80 * If the command was modified by the expansion, it was historically
83 if (F_ISSET(cmdp
, E_MODIFY
) && !F_ISSET(sp
, SC_EX_SILENT
)) {
85 * Display the command if modified. Historic ex/vi displayed
86 * the command if it was modified due to file name and/or bang
87 * expansion. If piping lines in vi, it would be immediately
88 * overwritten by any error or line change reporting.
90 if (F_ISSET(sp
, SC_VI
))
91 vs_update(sp
, "!", ap
->bp
);
93 (void)ex_printf(sp
, "!%s\n", ap
->bp
);
99 * If no addresses were specified, run the command. If there's an
100 * underlying file, it's been modified and autowrite is set, write
101 * the file back. If the file has been modified, autowrite is not
102 * set and the warn option is set, tell the user about the file.
104 if (cmdp
->addrcnt
== 0) {
106 if (sp
->ep
!= NULL
&& F_ISSET(sp
->ep
, F_MODIFIED
))
107 if (O_ISSET(sp
, O_AUTOWRITE
)) {
108 if (file_aw(sp
, FS_ALL
))
110 } else if (O_ISSET(sp
, O_WARN
) &&
111 !F_ISSET(sp
, SC_EX_SILENT
))
113 "303|File modified since last write.",
116 /* If we're still in a vi screen, move out explicitly. */
117 INT2CHAR(sp
, ap
->bp
, ap
->len
+1, np
, nlen
);
118 (void)ex_exec_proc(sp
,
119 cmdp
, np
, msg
, !F_ISSET(sp
, SC_EX
| SC_SCR_EXWROTE
));
123 * If addresses were specified, pipe lines from the file through the
126 * Historically, vi lines were replaced by both the stdout and stderr
127 * lines of the command, but ex lines by only the stdout lines. This
128 * makes no sense to me, so nvi makes it consistent for both, and
129 * matches vi's historic behavior.
134 /* Autoprint is set historically, even if the command fails. */
135 F_SET(cmdp
, E_AUTOPRINT
);
139 * Historical vi permitted "!!" in an empty file. When this
140 * happens, we arrive here with two addresses of 1,1 and a
141 * bad attitude. The simple solution is to turn it into a
142 * FILTER_READ operation, with the exception that stdin isn't
143 * opened for the utility, and the cursor position isn't the
144 * same. The only historic glitch (I think) is that we don't
145 * put an empty line into the default cut buffer, as historic
146 * vi did. Imagine, if you can, my disappointment.
149 if (cmdp
->addr1
.lno
== 1 && cmdp
->addr2
.lno
== 1) {
150 if (db_last(sp
, &lno
))
153 cmdp
->addr1
.lno
= cmdp
->addr2
.lno
= 0;
154 ftype
= FILTER_RBANG
;
157 rval
= ex_filter(sp
, cmdp
,
158 &cmdp
->addr1
, &cmdp
->addr2
, &rm
, ap
->bp
, ftype
);
161 * If in vi mode, move to the first nonblank.
164 * Historic vi wasn't consistent in this area -- if you used
165 * a forward motion it moved to the first nonblank, but if you
166 * did a backward motion it didn't. And, if you followed a
167 * backward motion with a forward motion, it wouldn't move to
168 * the nonblank for either. Going to the nonblank generally
169 * seems more useful and consistent, so we do it.
172 if (F_ISSET(sp
, SC_VI
)) {
174 (void)nonblank(sp
, sp
->lno
, &sp
->cno
);
179 /* Ex terminates with a bang, even if the command fails. */
180 if (!F_ISSET(sp
, SC_VI
) && !F_ISSET(sp
, SC_EX_SILENT
))
181 (void)ex_puts(sp
, "!\n");
185 * The ! commands never return an error, so that autoprint always
186 * happens in the ex parser.