660 lines
15 KiB
C
660 lines
15 KiB
C
/*
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* Copyright (c) 1988 Mark Nudleman
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)command.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <sys/param.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <less.h>
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#include "pathnames.h"
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#define NO_MCA 0
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#define MCA_DONE 1
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#define MCA_MORE 2
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extern int erase_char, kill_char, werase_char;
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extern int ispipe;
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extern int sigs;
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extern int quit_at_eof;
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extern int hit_eof;
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extern int sc_width;
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extern int sc_height;
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extern int sc_window;
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extern int curr_ac;
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extern int ac;
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extern int quitting;
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extern int scroll;
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extern int screen_trashed; /* The screen has been overwritten */
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static char cmdbuf[120]; /* Buffer for holding a multi-char command */
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static char *cp; /* Pointer into cmdbuf */
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static int cmd_col; /* Current column of the multi-char command */
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static int longprompt; /* if stat command instead of prompt */
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static int mca; /* The multicharacter command (action) */
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static int last_mca; /* The previous mca */
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static int number; /* The number typed by the user */
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static int wsearch; /* Search for matches (1) or non-matches (0) */
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#define CMD_RESET cp = cmdbuf /* reset command buffer to empty */
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#define CMD_EXEC lower_left(); flush()
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/* backspace in command buffer. */
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static
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cmd_erase()
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{
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int c;
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/*
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* backspace past beginning of the string: this usually means
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* abort the command.
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*/
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if (cp == cmdbuf)
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return(1);
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/* erase an extra character, for the carat. */
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c = *--cp;
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if (CONTROL_CHAR(c)) {
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backspace();
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--cmd_col;
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}
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backspace();
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--cmd_col;
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return(0);
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}
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/* set up the display to start a new multi-character command. */
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start_mca(action, prompt)
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int action;
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char *prompt;
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{
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lower_left();
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clear_eol();
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putstr(prompt);
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cmd_col = strlen(prompt);
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mca = action;
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}
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/*
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* process a single character of a multi-character command, such as
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* a number, or the pattern of a search command.
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*/
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static
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cmd_char(c)
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int c;
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{
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if (c == erase_char)
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return(cmd_erase());
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/* in this order, in case werase == erase_char */
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if (c == werase_char) {
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if (cp > cmdbuf) {
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while (isspace(cp[-1]) && !cmd_erase());
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while (!isspace(cp[-1]) && !cmd_erase());
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while (isspace(cp[-1]) && !cmd_erase());
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}
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return(cp == cmdbuf);
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}
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if (c == kill_char) {
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while (!cmd_erase());
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return(1);
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}
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/*
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* No room in the command buffer, or no room on the screen;
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* {{ Could get fancy here; maybe shift the displayed line
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* and make room for more chars, like ksh. }}
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*/
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if (cp >= &cmdbuf[sizeof(cmdbuf)-1] || cmd_col >= sc_width-3)
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bell();
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else {
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*cp++ = c;
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if (CONTROL_CHAR(c)) {
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putchr('^');
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cmd_col++;
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c &= ~0200;
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c = CARAT_CHAR(c);
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}
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putchr(c);
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cmd_col++;
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}
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return(0);
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}
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prompt()
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{
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extern int linenums, short_file;
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extern char *current_name, *firstsearch, *next_name;
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off_t len, pos, ch_length(), position(), forw_line();
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char pbuf[40];
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/*
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* if nothing is displayed yet, display starting from line 1;
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* if search string provided, go there instead.
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*/
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if (position(TOP) == NULL_POSITION) {
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if (forw_line((off_t)0) == NULL_POSITION)
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return(0);
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if (!firstsearch || !search(1, firstsearch, 1, 1))
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jump_back(1);
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}
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else if (screen_trashed)
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repaint();
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/* if no -e flag and we've hit EOF on the last file, quit. */
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if ((!quit_at_eof || short_file) && hit_eof && curr_ac + 1 >= ac)
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quit();
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/* select the proper prompt and display it. */
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lower_left();
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clear_eol();
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if (longprompt) {
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so_enter();
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putstr(current_name);
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putstr(":");
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if (!ispipe) {
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(void)sprintf(pbuf, " file %d/%d", curr_ac + 1, ac);
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putstr(pbuf);
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}
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if (linenums) {
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(void)sprintf(pbuf, " line %d", currline(BOTTOM));
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putstr(pbuf);
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}
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if ((pos = position(BOTTOM)) != NULL_POSITION) {
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(void)sprintf(pbuf, " byte %qd", pos);
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putstr(pbuf);
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if (!ispipe && (len = ch_length())) {
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(void)sprintf(pbuf, "/%qd pct %qd%%",
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len, ((100 * pos) / len));
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putstr(pbuf);
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}
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}
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so_exit();
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longprompt = 0;
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}
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else {
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so_enter();
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putstr(current_name);
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if (hit_eof)
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if (next_name) {
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putstr(": END (next file: ");
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putstr(next_name);
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putstr(")");
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}
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else
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putstr(": END");
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else if (!ispipe &&
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(pos = position(BOTTOM)) != NULL_POSITION &&
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(len = ch_length())) {
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(void)sprintf(pbuf, " (%qd%%)", ((100 * pos) / len));
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putstr(pbuf);
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}
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so_exit();
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}
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return(1);
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}
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/* get command character. */
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static
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getcc()
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{
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extern int cmdstack;
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int ch;
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off_t position();
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/* left over from error() routine. */
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if (cmdstack) {
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ch = cmdstack;
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cmdstack = NULL;
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return(ch);
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}
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if (cp > cmdbuf && position(TOP) == NULL_POSITION) {
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/*
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* Command is incomplete, so try to complete it.
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* There are only two cases:
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* 1. We have "/string" but no newline. Add the \n.
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* 2. We have a number but no command. Treat as #g.
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* (This is all pretty hokey.)
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*/
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if (mca != A_DIGIT)
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/* Not a number; must be search string */
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return('\n');
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else
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/* A number; append a 'g' */
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return('g');
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}
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return(getchr());
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}
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/* execute a multicharacter command. */
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static
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exec_mca()
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{
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extern int file;
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extern char *tagfile;
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register char *p;
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char *glob();
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*cp = '\0';
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CMD_EXEC;
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switch (mca) {
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case A_F_SEARCH:
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(void)search(1, cmdbuf, number, wsearch);
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break;
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case A_B_SEARCH:
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(void)search(0, cmdbuf, number, wsearch);
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break;
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case A_EXAMINE:
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for (p = cmdbuf; isspace(*p); ++p);
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(void)edit(glob(p));
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break;
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case A_TAGFILE:
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for (p = cmdbuf; isspace(*p); ++p);
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findtag(p);
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if (tagfile == NULL)
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break;
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if (edit(tagfile))
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(void)tagsearch();
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break;
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}
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}
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/* add a character to a multi-character command. */
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static
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mca_char(c)
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int c;
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{
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switch (mca) {
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case 0: /* not in a multicharacter command. */
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case A_PREFIX: /* in the prefix of a command. */
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return(NO_MCA);
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case A_DIGIT:
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/*
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* Entering digits of a number.
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* Terminated by a non-digit.
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*/
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if (!isascii(c) || !isdigit(c) &&
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c != erase_char && c != kill_char && c != werase_char) {
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/*
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* Not part of the number.
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* Treat as a normal command character.
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*/
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*cp = '\0';
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number = atoi(cmdbuf);
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CMD_RESET;
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mca = 0;
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return(NO_MCA);
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}
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break;
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}
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/*
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* Any other multicharacter command
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* is terminated by a newline.
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*/
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if (c == '\n' || c == '\r') {
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exec_mca();
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return(MCA_DONE);
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}
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/* append the char to the command buffer. */
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if (cmd_char(c))
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return(MCA_DONE);
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return(MCA_MORE);
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}
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/*
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* Main command processor.
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* Accept and execute commands until a quit command, then return.
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*/
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commands()
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{
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register int c;
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register int action;
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last_mca = 0;
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scroll = (sc_height + 1) / 2;
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for (;;) {
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mca = 0;
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number = 0;
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/*
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* See if any signals need processing.
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*/
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if (sigs) {
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psignals();
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if (quitting)
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quit();
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}
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/*
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* Display prompt and accept a character.
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*/
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CMD_RESET;
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if (!prompt()) {
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next_file(1);
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continue;
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}
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noprefix();
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c = getcc();
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again: if (sigs)
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continue;
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/*
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* If we are in a multicharacter command, call mca_char.
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* Otherwise we call cmd_decode to determine the
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* action to be performed.
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*/
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if (mca)
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switch (mca_char(c)) {
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case MCA_MORE:
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/*
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* Need another character.
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*/
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c = getcc();
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goto again;
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case MCA_DONE:
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/*
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* Command has been handled by mca_char.
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* Start clean with a prompt.
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*/
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continue;
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case NO_MCA:
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/*
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* Not a multi-char command
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* (at least, not anymore).
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*/
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break;
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}
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/* decode the command character and decide what to do. */
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switch (action = cmd_decode(c)) {
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case A_DIGIT: /* first digit of a number */
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start_mca(A_DIGIT, ":");
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goto again;
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case A_F_SCREEN: /* forward one screen */
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CMD_EXEC;
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if (number <= 0 && (number = sc_window) <= 0)
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number = sc_height - 1;
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forward(number, 1);
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break;
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case A_B_SCREEN: /* backward one screen */
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CMD_EXEC;
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if (number <= 0 && (number = sc_window) <= 0)
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number = sc_height - 1;
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backward(number, 1);
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break;
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case A_F_LINE: /* forward N (default 1) line */
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CMD_EXEC;
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forward(number <= 0 ? 1 : number, 0);
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break;
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case A_B_LINE: /* backward N (default 1) line */
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CMD_EXEC;
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backward(number <= 0 ? 1 : number, 0);
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break;
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case A_F_SCROLL: /* forward N lines */
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CMD_EXEC;
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if (number > 0)
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scroll = number;
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forward(scroll, 0);
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break;
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case A_B_SCROLL: /* backward N lines */
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CMD_EXEC;
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if (number > 0)
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scroll = number;
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backward(scroll, 0);
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break;
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case A_FREPAINT: /* flush buffers and repaint */
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if (!ispipe) {
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ch_init(0, 0);
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clr_linenum();
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}
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/* FALLTHROUGH */
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case A_REPAINT: /* repaint the screen */
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CMD_EXEC;
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repaint();
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break;
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case A_GOLINE: /* go to line N, default 1 */
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CMD_EXEC;
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if (number <= 0)
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number = 1;
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jump_back(number);
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break;
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case A_PERCENT: /* go to percent of file */
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CMD_EXEC;
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if (number < 0)
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number = 0;
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else if (number > 100)
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number = 100;
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jump_percent(number);
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break;
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case A_GOEND: /* go to line N, default end */
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CMD_EXEC;
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if (number <= 0)
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jump_forw();
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else
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jump_back(number);
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break;
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case A_STAT: /* print file name, etc. */
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longprompt = 1;
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continue;
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case A_QUIT: /* exit */
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quit();
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case A_F_SEARCH: /* search for a pattern */
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case A_B_SEARCH:
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if (number <= 0)
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number = 1;
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start_mca(action, (action==A_F_SEARCH) ? "/" : "?");
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last_mca = mca;
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wsearch = 1;
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c = getcc();
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if (c == '!') {
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/*
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* Invert the sense of the search; set wsearch
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* to 0 and get a new character for the start
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* of the pattern.
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*/
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start_mca(action,
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(action == A_F_SEARCH) ? "!/" : "!?");
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wsearch = 0;
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c = getcc();
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}
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goto again;
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case A_AGAIN_SEARCH: /* repeat previous search */
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if (number <= 0)
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number = 1;
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if (wsearch)
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start_mca(last_mca,
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(last_mca == A_F_SEARCH) ? "/" : "?");
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else
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start_mca(last_mca,
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(last_mca == A_F_SEARCH) ? "!/" : "!?");
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CMD_EXEC;
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(void)search(mca == A_F_SEARCH, (char *)NULL,
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number, wsearch);
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break;
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case A_HELP: /* help */
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lower_left();
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clear_eol();
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putstr("help");
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CMD_EXEC;
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help();
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break;
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case A_TAGFILE: /* tag a new file */
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CMD_RESET;
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start_mca(A_TAGFILE, "Tag: ");
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c = getcc();
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goto again;
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case A_FILE_LIST: /* show list of file names */
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CMD_EXEC;
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showlist();
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repaint();
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break;
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case A_EXAMINE: /* edit a new file */
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CMD_RESET;
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start_mca(A_EXAMINE, "Examine: ");
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c = getcc();
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goto again;
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case A_VISUAL: /* invoke the editor */
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if (ispipe) {
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error("Cannot edit standard input");
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break;
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}
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CMD_EXEC;
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editfile();
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ch_init(0, 0);
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clr_linenum();
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break;
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case A_NEXT_FILE: /* examine next file */
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if (number <= 0)
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number = 1;
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next_file(number);
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break;
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case A_PREV_FILE: /* examine previous file */
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if (number <= 0)
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number = 1;
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prev_file(number);
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break;
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case A_SETMARK: /* set a mark */
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lower_left();
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clear_eol();
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start_mca(A_SETMARK, "mark: ");
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c = getcc();
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if (c == erase_char || c == kill_char)
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break;
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setmark(c);
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break;
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case A_GOMARK: /* go to mark */
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lower_left();
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clear_eol();
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start_mca(A_GOMARK, "goto mark: ");
|
|
c = getcc();
|
|
if (c == erase_char || c == kill_char)
|
|
break;
|
|
gomark(c);
|
|
break;
|
|
case A_PREFIX:
|
|
/*
|
|
* The command is incomplete (more chars are needed).
|
|
* Display the current char so the user knows what's
|
|
* going on and get another character.
|
|
*/
|
|
if (mca != A_PREFIX)
|
|
start_mca(A_PREFIX, "");
|
|
if (CONTROL_CHAR(c)) {
|
|
putchr('^');
|
|
c &= ~0200;
|
|
c = CARAT_CHAR(c);
|
|
}
|
|
putchr(c);
|
|
c = getcc();
|
|
goto again;
|
|
default:
|
|
bell();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
editfile()
|
|
{
|
|
extern char *current_file;
|
|
static int dolinenumber;
|
|
static char *editor;
|
|
int c;
|
|
char buf[MAXPATHLEN * 2 + 20], *getenv();
|
|
|
|
if (editor == NULL) {
|
|
editor = getenv("EDITOR");
|
|
/* pass the line number to vi */
|
|
if (editor == NULL || *editor == '\0') {
|
|
editor = _PATH_VI;
|
|
dolinenumber = 1;
|
|
}
|
|
else
|
|
dolinenumber = 0;
|
|
}
|
|
if (dolinenumber && (c = currline(MIDDLE)))
|
|
(void)sprintf(buf, "%s +%d %s", editor, c, current_file);
|
|
else
|
|
(void)sprintf(buf, "%s %s", editor, current_file);
|
|
lsystem(buf);
|
|
}
|
|
|
|
showlist()
|
|
{
|
|
extern int sc_width;
|
|
extern char **av;
|
|
register int indx, width;
|
|
int len;
|
|
char *p;
|
|
|
|
if (ac <= 0) {
|
|
error("No files provided as arguments.");
|
|
return;
|
|
}
|
|
for (width = indx = 0; indx < ac;) {
|
|
p = strcmp(av[indx], "-") ? av[indx] : "stdin";
|
|
len = strlen(p) + 1;
|
|
if (curr_ac == indx)
|
|
len += 2;
|
|
if (width + len + 1 >= sc_width) {
|
|
if (!width) {
|
|
if (curr_ac == indx)
|
|
putchr('[');
|
|
putstr(p);
|
|
if (curr_ac == indx)
|
|
putchr(']');
|
|
++indx;
|
|
}
|
|
width = 0;
|
|
putchr('\n');
|
|
continue;
|
|
}
|
|
if (width)
|
|
putchr(' ');
|
|
if (curr_ac == indx)
|
|
putchr('[');
|
|
putstr(p);
|
|
if (curr_ac == indx)
|
|
putchr(']');
|
|
width += len;
|
|
++indx;
|
|
}
|
|
putchr('\n');
|
|
error((char *)NULL);
|
|
}
|