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https://github.com/tildeclub/ex-vi.git
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Initial revision
This commit is contained in:
Gunnar Ritter
500
ex_vwind.c
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500
ex_vwind.c
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@@ -0,0 +1,500 @@
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/*
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* This code contains changes by
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* Gunnar Ritter, Freiburg i. Br., Germany, 2002. All rights reserved.
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*
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* Conditions 1, 2, and 4 and the no-warranty notice below apply
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* to these changes.
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*
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*
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* Copyright (c) 1980, 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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*
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* Copyright(C) Caldera International Inc. 2001-2002. 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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* Redistributions of source code and documentation must retain the
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* above copyright notice, this list of conditions and the following
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* disclaimer.
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* 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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* 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 or owned by Caldera
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* International, Inc.
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* Neither the name of Caldera International, Inc. nor the names of
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* other contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
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* INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE
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* LIABLE FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef lint
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#ifdef DOSCCS
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static char sccsid[] = "@(#)ex_vwind.c 1.9 (gritter) 11/23/04";
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#endif
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#endif
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/* from ex_vwind.c 7.3 (Berkeley) 6/7/85 */
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#include "ex.h"
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#include "ex_tty.h"
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#include "ex_vis.h"
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/*
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* Routines to adjust the window, showing specified lines
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* in certain positions on the screen, and scrolling in both
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* directions. Code here is very dependent on mode (open versus visual).
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*/
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/*
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* Move in a nonlocal way to line addr.
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* If it isn't on screen put it in specified context.
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* New position for cursor is curs.
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* Like most routines here, we vsave().
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*/
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void
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vmoveto(register line *addr, char *curs, int context)
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{
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markit(addr);
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vsave();
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vjumpto(addr, curs, context);
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}
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/*
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* Vjumpto is like vmoveto, but doesn't mark previous
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* context or save linebuf as current line.
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*/
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void
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vjumpto(register line *addr, char *curs, int context)
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{
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noteit(0);
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if (context != 0)
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vcontext(addr, context);
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else
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vshow(addr, NOLINE);
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noteit(1);
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vnline(curs);
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}
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/*
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* Go up or down cnt (negative is up) to new position curs.
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*/
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void
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vupdown(register int cnt, char *curs)
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{
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if (cnt > 0)
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vdown(cnt, 0, 0);
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else if (cnt < 0)
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vup(-cnt, 0, 0);
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if (vcnt == 0)
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vrepaint(curs);
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else
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vnline(curs);
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}
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/*
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* Go up cnt lines, afterwards preferring to be ind
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* logical lines from the top of the screen.
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* If scroll, then we MUST use a scroll.
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* Otherwise clear and redraw if motion is far.
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*/
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void
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vup(register int cnt, register int ind, int scroll)
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{
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register int i, tot;
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if (dot == one) {
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beep();
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return;
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}
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vsave();
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i = lineDOT() - 1;
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if (cnt > i) {
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ind -= cnt - i;
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if (ind < 0)
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ind = 0;
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cnt = i;
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}
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if (!scroll && cnt <= vcline) {
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vshow(dot - cnt, NOLINE);
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return;
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}
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cnt -= vcline, dot -= vcline, vcline = 0;
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if (hold & HOLDWIG)
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goto contxt;
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if (state == VISUAL && !AL && !SR &&
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cnt <= WTOP - ZERO && vfit(dot - cnt, cnt) <= WTOP - ZERO)
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goto okr;
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tot = WECHO - ZERO;
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if (state != VISUAL || (!AL && !SR) || (!scroll && (cnt > tot || vfit(dot - cnt, cnt) > tot / 3 + 1))) {
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if (ind > basWLINES / 2)
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ind = basWLINES / 3;
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contxt:
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vcontext(dot + ind - cnt, '.');
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return;
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}
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okr:
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vrollR(cnt);
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if (scroll) {
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vcline += ind, dot += ind;
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if (vcline >= vcnt)
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dot -= vcline - vcnt + 1, vcline = vcnt - 1;
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getDOT();
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}
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}
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/*
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* Like vup, but scrolling down.
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*/
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void
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vdown(register int cnt, register int ind, int scroll)
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{
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register int i, tot;
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if (dot == dol) {
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beep();
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return;
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}
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vsave();
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i = dol - dot;
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if (cnt > i) {
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ind -= cnt - i;
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if (ind < 0)
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ind = 0;
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cnt = i;
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}
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i = vcnt - vcline - 1;
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if (!scroll && cnt <= i) {
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vshow(dot + cnt, NOLINE);
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return;
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}
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cnt -= i, dot += i, vcline += i;
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if (hold & HOLDWIG)
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goto dcontxt;
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if (!scroll) {
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tot = WECHO - ZERO;
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if (state != VISUAL || cnt - tot > 0 || vfit(dot, cnt) > tot / 3 + 1) {
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dcontxt:
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vcontext(dot + cnt, '.');
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return;
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}
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}
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if (cnt > 0)
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vroll(cnt);
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if (state == VISUAL && scroll) {
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vcline -= ind, dot -= ind;
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if (vcline < 0)
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dot -= vcline, vcline = 0;
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getDOT();
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}
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}
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/*
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* Show line addr in context where on the screen.
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* Work here is in determining new top line implied by
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* this placement of line addr, since we always draw from the top.
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*/
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void
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vcontext(register line *addr, int where)
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{
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register line *top;
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getline(*addr);
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if (state != VISUAL)
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top = addr;
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else switch (where) {
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case '^':
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addr = vback(addr, basWLINES - vdepth());
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getline(*addr);
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/* fall into ... */
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case '-':
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top = vback(addr, basWLINES - vdepth());
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getline(*addr);
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break;
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case '.':
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top = vback(addr, basWLINES / 2 - vdepth());
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getline(*addr);
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break;
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default:
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top = addr;
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break;
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}
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if (state == ONEOPEN && LINE(0) == WBOT)
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vup1();
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vcnt = vcline = 0;
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vclean();
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if (state == CRTOPEN)
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vup1();
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vshow(addr, top);
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}
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/*
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* Get a clean line. If we are in a hard open
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* we may be able to reuse the line we are on
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* if it is blank. This is a real win.
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*/
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void
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vclean(void)
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{
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if (state != VISUAL && state != CRTOPEN) {
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destcol = 0;
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if (!ateopr())
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vup1();
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vcnt = 0;
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}
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}
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/*
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* Show line addr with the specified top line on the screen.
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* Top may be 0; in this case have vcontext compute the top
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* (and call us recursively). Eventually, we clear the screen
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* (or its open mode equivalent) and redraw.
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*/
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void
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vshow(line *addr, line *top)
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{
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register int cnt = addr - dot;
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register int i = vcline + cnt;
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short oldhold = hold;
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if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) {
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dot = addr;
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getDOT();
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vcline = i;
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return;
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}
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if (state != VISUAL) {
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dot = addr;
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vopen(dot, WBOT);
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return;
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}
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if (top == 0) {
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vcontext(addr, '.');
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return;
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}
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dot = top;
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oldhold = hold;
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hold |= HOLDAT;
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vclear();
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vreset(0);
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vredraw(WTOP);
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/* error if vcline >= vcnt ! */
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vcline = addr - top;
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dot = addr;
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getDOT();
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hold = oldhold;
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vsync(LASTLINE);
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}
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/*
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* reset the state.
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* If inecho then leave us at the beginning of the echo
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* area; we are called this way in the middle of a :e escape
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* from visual, e.g.
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*/
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void
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vreset(int inecho)
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{
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vcnt = vcline = 0;
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WTOP = basWTOP;
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WLINES = basWLINES;
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if (inecho)
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splitw = 1, vgoto(WECHO, 0);
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}
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/*
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* Starting from which line preceding tp uses almost (but not more
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* than) cnt physical lines?
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*/
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line *
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vback(register line *tp, register int cnt)
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{
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register int d;
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if (cnt > 0)
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for (; tp > one; tp--) {
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getline(tp[-1]);
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d = vdepth();
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if (d > cnt)
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break;
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cnt -= d;
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}
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return (tp);
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}
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/*
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* How much scrolling will it take to roll cnt lines starting at tp?
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*/
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int
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vfit(register line *tp, int cnt)
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{
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register int j;
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j = 0;
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while (cnt > 0) {
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cnt--;
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getline(tp[cnt]);
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j += vdepth();
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}
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if (tp > dot)
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j -= WBOT - LASTLINE;
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return (j);
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}
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/*
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* Roll cnt lines onto the screen.
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*/
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void
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vroll(register int cnt)
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{
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short oldhold = hold;
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#ifdef ADEBUG
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if (trace)
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tfixnl(), fprintf(trace, "vroll(%d)\n", cnt);
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#endif
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if (state != VISUAL)
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hold |= HOLDAT|HOLDROL;
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if (WBOT == WECHO) {
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vcnt = 0;
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if (state == ONEOPEN)
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vup1();
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}
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for (; cnt > 0 && Peekkey != ATTN; cnt--) {
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dot++, vcline++;
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vopen(dot, LASTLINE);
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vscrap();
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}
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hold = oldhold;
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if (state == HARDOPEN)
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sethard();
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vsyncCL();
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}
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/*
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* Roll backwards (scroll up).
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*/
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void
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vrollR(register int cnt)
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{
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short oldhold = hold;
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#ifdef ADEBUG
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if (trace)
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tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT());
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#endif
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if (WBOT == WECHO)
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vcnt = 0;
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heldech = 0;
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hold |= HOLDAT|HOLDECH;
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for (; cnt > 0 && Peekkey != ATTN; cnt--) {
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dot--;
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vopen(dot, WTOP);
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vscrap();
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}
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hold = oldhold;
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if (heldech)
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vclrech(0);
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vsync(LINE(vcnt-1));
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}
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/*
|
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* Go into cooked mode (allow interrupts) during
|
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* a scroll if we are at less than 1200 baud and not
|
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* a 'vi' command, of if we are in a 'vi' command and the
|
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* scroll is more than 2 full screens.
|
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*
|
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* BUG: An interrupt during a scroll in this way
|
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* dumps to command mode.
|
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*/
|
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int
|
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vcookit(register int cnt)
|
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{
|
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return (cnt > 1 && (ospeed < B1200 && !initev || cnt > TLINES * 2));
|
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}
|
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/*
|
||||
* Determine displayed depth of current line.
|
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*/
|
||||
int
|
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vdepth(void)
|
||||
{
|
||||
register int d;
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|
||||
d = (column(NOSTR) + WCOLS - 1 + (Putchar == listchar) + IN) / WCOLS;
|
||||
#ifdef ADEBUG
|
||||
if (trace)
|
||||
tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d);
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#endif
|
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return (d == 0 ? 1 : d);
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}
|
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|
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/*
|
||||
* Move onto a new line, with cursor at position curs.
|
||||
*/
|
||||
void
|
||||
vnline(char *curs)
|
||||
{
|
||||
|
||||
if (curs)
|
||||
wcursor = curs;
|
||||
else if (vmoving)
|
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wcursor = vfindcol(vmovcol);
|
||||
else
|
||||
wcursor = vskipwh(linebuf);
|
||||
cursor = linebuf;
|
||||
vmove(0);
|
||||
}
|
||||
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