From 526ce3a130732d4a2374a6e36a689d9e0cf5cc34 Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Wed, 31 Jul 2019 00:10:35 +0100
Subject: preliminary support for undo

---
 draw.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 51 insertions(+), 4 deletions(-)

(limited to 'draw.c')

diff --git a/draw.c b/draw.c
index 3c98534..e3bdbce 100644
--- a/draw.c
+++ b/draw.c
@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <string.h>
 
 #include "gramscii.h"
 #include "config.h"
@@ -103,16 +104,19 @@ void draw_box(int x1, int y1, int fix){
 	int i;
 	void (*f)(int, int, char);
 
-	if (fix == FIX)
-		f = set_xy;
-	else
-		f = draw_xy;
 
 	xmin = MIN(x, x1);
 	xmax = MAX(x, x1);
 	ymin = MIN(y, y1);
 	ymax = MAX(y, y1);
 
+	if (fix == FIX){
+		f = set_xy;
+		copy_lines_to_ring(ymin, ymax, CUR);
+	}
+	else
+		f = draw_xy;
+
 	for(i=xmin+1; i<=xmax; i++){
 		f(i, ymin, line_h);
 		f(i, ymax, line_h);
@@ -125,6 +129,8 @@ void draw_box(int x1, int y1, int fix){
 	f(xmin, ymax, corner);
 	f(xmax, ymin, corner);
 	f(xmax, ymax, corner);
+	if (fix == FIX)
+		copy_lines_to_ring(ymin, ymax, LST);
 	show_cursor();
 }
 
@@ -157,6 +163,7 @@ update_box:
 
 void draw_arrow(int x, int y, char *a, int a_len, int fix){
 
+	/* FIXME: copy affected lines to undo */
 	int i, j, cur_dir;
 	char line;
 	void (*f)(int, int, char);
@@ -266,6 +273,7 @@ void do_erase(int x1, int y1){
 
 
 void erase(FILE *fc){
+	/*FIXME: add affected lines to undo */
 	char c;
 	int orig_x = x, orig_y = y;
 	status_bar();
@@ -308,8 +316,11 @@ void visual_box(FILE *fc){
 			case 'x':/* erase */
 				if (c == 'x')
 					yank_region(MIN(orig_x,x), MIN(orig_y,y), MAX(orig_x, x), MAX(orig_y, y));
+				copy_lines_to_ring(MIN(orig_y, y), MAX(orig_y, y), CUR);
 				erase_box(orig_x, orig_y, f);
 				erase_blank_lines(MIN(y,orig_y), MAX(y, orig_y));
+				copy_lines_to_ring(MIN(orig_y, y), MAX(orig_y, y), LST);
+		
 				modified = 1;
 				goto vis_exit;
 				break;
@@ -331,6 +342,42 @@ vis_exit:
 }
 
 void paste(){
+	int y2;
+
+	y2 = y + cutbuf.num - 1;
+	copy_lines_to_ring(y, y2, CUR);
 	paste_region(x, y);
+	copy_lines_to_ring(y, y2, LST);
+	redraw();
+}
+
+void put_lines(lineset_t *u){
+	int i, n;
+	
+	for (i=0; i< u->num; i++){
+		n = u->l[i].n;
+		ensure_line_length(&(screen.l[i]), u->l[i].lst);
+		strcpy(screen.l[n].s, u->l[i].s);
+		screen.l[n].lst = u->l[i].lst;
+	}
+}
+
+
+void undo_change(){
+	if (undo_cur >= 0){
+		put_lines(& (undo[undo_cur]));
+		undo_cur --;
+	}
+	redraw();
+	modified = 1;
+}
+
+void redo_change(){
+	if (undo_cur < undo_lst){
+		undo_cur ++;
+		put_lines(& (undo[undo_cur]));
+	}
 	redraw();
+	modified = 1;
 }
+
-- 
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