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Diffstat (limited to 'contrib/nvi/ex/ex_bang.c')
| -rw-r--r-- | contrib/nvi/ex/ex_bang.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/contrib/nvi/ex/ex_bang.c b/contrib/nvi/ex/ex_bang.c new file mode 100644 index 000000000000..25f3f7732ab0 --- /dev/null +++ b/contrib/nvi/ex/ex_bang.c @@ -0,0 +1,186 @@ +/*- + * 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[] = "@(#)ex_bang.c 10.33 (Berkeley) 9/23/96"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/queue.h> +#include <sys/time.h> + +#include <bitstring.h> +#include <errno.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "../common/common.h" +#include "../vi/vi.h" + +/* + * ex_bang -- :[line [,line]] ! command + * + * Pass the rest of the line after the ! character to the program named by + * the O_SHELL option. + * + * Historical vi did NOT do shell expansion on the arguments before passing + * them, only file name expansion. This means that the O_SHELL program got + * "$t" as an argument if that is what the user entered. Also, there's a + * special expansion done for the bang command. Any exclamation points in + * the user's argument are replaced by the last, expanded ! command. + * + * There's some fairly amazing slop in this routine to make the different + * ways of getting here display the right things. It took a long time to + * get it right (wrong?), so be careful. + * + * PUBLIC: int ex_bang __P((SCR *, EXCMD *)); + */ +int +ex_bang(sp, cmdp) + SCR *sp; + EXCMD *cmdp; +{ + enum filtertype ftype; + ARGS *ap; + EX_PRIVATE *exp; + MARK rm; + recno_t lno; + int rval; + const char *msg; + + ap = cmdp->argv[0]; + if (ap->len == 0) { + ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE); + return (1); + } + + /* Set the "last bang command" remembered value. */ + exp = EXP(sp); + if (exp->lastbcomm != NULL) + free(exp->lastbcomm); + if ((exp->lastbcomm = strdup(ap->bp)) == NULL) { + msgq(sp, M_SYSERR, NULL); + return (1); + } + + /* + * If the command was modified by the expansion, it was historically + * redisplayed. + */ + if (F_ISSET(cmdp, E_MODIFY) && !F_ISSET(sp, SC_EX_SILENT)) { + /* + * Display the command if modified. Historic ex/vi displayed + * the command if it was modified due to file name and/or bang + * expansion. If piping lines in vi, it would be immediately + * overwritten by any error or line change reporting. + */ + if (F_ISSET(sp, SC_VI)) + vs_update(sp, "!", ap->bp); + else { + (void)ex_printf(sp, "!%s\n", ap->bp); + (void)ex_fflush(sp); + } + } + + /* + * If no addresses were specified, run the command. If there's an + * underlying file, it's been modified and autowrite is set, write + * the file back. If the file has been modified, autowrite is not + * set and the warn option is set, tell the user about the file. + */ + if (cmdp->addrcnt == 0) { + msg = NULL; + if (sp->ep != NULL && F_ISSET(sp->ep, F_MODIFIED)) + if (O_ISSET(sp, O_AUTOWRITE)) { + if (file_aw(sp, FS_ALL)) + return (0); + } else if (O_ISSET(sp, O_WARN) && + !F_ISSET(sp, SC_EX_SILENT)) + msg = msg_cat(sp, + "303|File modified since last write.", + NULL); + + /* If we're still in a vi screen, move out explicitly. */ + (void)ex_exec_proc(sp, + cmdp, ap->bp, msg, !F_ISSET(sp, SC_EX | SC_SCR_EXWROTE)); + } + + /* + * If addresses were specified, pipe lines from the file through the + * command. + * + * Historically, vi lines were replaced by both the stdout and stderr + * lines of the command, but ex lines by only the stdout lines. This + * makes no sense to me, so nvi makes it consistent for both, and + * matches vi's historic behavior. + */ + else { + NEEDFILE(sp, cmdp); + + /* Autoprint is set historically, even if the command fails. */ + F_SET(cmdp, E_AUTOPRINT); + + /* + * !!! + * Historical vi permitted "!!" in an empty file. When this + * happens, we arrive here with two addresses of 1,1 and a + * bad attitude. The simple solution is to turn it into a + * FILTER_READ operation, with the exception that stdin isn't + * opened for the utility, and the cursor position isn't the + * same. The only historic glitch (I think) is that we don't + * put an empty line into the default cut buffer, as historic + * vi did. Imagine, if you can, my disappointment. + */ + ftype = FILTER_BANG; + if (cmdp->addr1.lno == 1 && cmdp->addr2.lno == 1) { + if (db_last(sp, &lno)) + return (1); + if (lno == 0) { + cmdp->addr1.lno = cmdp->addr2.lno = 0; + ftype = FILTER_RBANG; + } + } + rval = ex_filter(sp, cmdp, + &cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype); + + /* + * If in vi mode, move to the first nonblank. + * + * !!! + * Historic vi wasn't consistent in this area -- if you used + * a forward motion it moved to the first nonblank, but if you + * did a backward motion it didn't. And, if you followed a + * backward motion with a forward motion, it wouldn't move to + * the nonblank for either. Going to the nonblank generally + * seems more useful and consistent, so we do it. + */ + sp->lno = rm.lno; + if (F_ISSET(sp, SC_VI)) { + sp->cno = 0; + (void)nonblank(sp, sp->lno, &sp->cno); + } else + sp->cno = rm.cno; + } + + /* Ex terminates with a bang, even if the command fails. */ + if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT)) + (void)ex_puts(sp, "!\n"); + + /* + * XXX + * The ! commands never return an error, so that autoprint always + * happens in the ex parser. + */ + return (0); +} |