From b38ed132a7df231fc08ce384d8559e6648fdd0cc Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Sat, 27 Jul 2019 08:06:27 +0100
Subject: first step towards crop + some fixes to erase

---
 TODO       |   3 +-
 files.c    |   2 +-
 gramscii.h |   5 ++-
 main.c     |   3 ++
 screen.c   | 138 ++++++++++++++++++++++++++++++++++++++++++++-----------------
 5 files changed, 110 insertions(+), 41 deletions(-)

diff --git a/TODO b/TODO
index d521256..59534ac 100644
--- a/TODO
+++ b/TODO
@@ -1,4 +1,6 @@
 + optimize redraws (redraw only the modified rectangle)
++ add crop command (C)
+- fix bug with 'g' commands in arrow mode
 - add screen geometry option (-g 25x80?)
 - read file at point
   - read output of command (!)
@@ -11,7 +13,6 @@
 + parse control characters 
   + parse arrows (text-mode will allow movements as well)
 - (?) implement CTRL+G as abort (aside ESC)
-- add crop command (C)
 - (?) remove extra blanks until EOL when saving to file
 + visual selection
   - crop-to
diff --git a/files.c b/files.c
index 811a9bc..c007eac 100644
--- a/files.c
+++ b/files.c
@@ -53,7 +53,7 @@ void load_file(FILE *fc){
 		while((fgets(screen[i].s, WIDTH+2, fin)) != NULL && i<HEIGHT)
 			screen[i++].s[WIDTH-1]='\0';
 		for(;i<HEIGHT; i++){
-			erase_line(screen[i].s);
+			erase_line(i);
 		}
 		fclose(fin);
 	}
diff --git a/gramscii.h b/gramscii.h
index 0b2c81f..6666515 100644
--- a/gramscii.h
+++ b/gramscii.h
@@ -59,7 +59,7 @@ typedef struct{
 #define progr_x(d) ((d) == DIR_L ? -1 : (d) == DIR_R ? 1 : 0)
 #define progr_y(d) ((d) == DIR_U ? -1 : (d) == DIR_D ? 1 : 0)
 
-/* #define DEBUG 1 */
+#define DEBUG 1
 
 /** global variables **/ 
 
@@ -116,9 +116,10 @@ void get_string(FILE *fc, char *msg, char *s, int sz);
 void erase_box(int x1, int y1, char c);
 int is_yes(char c);
 void init_screen();
-void erase_line(char *s);
+void erase_line(int i);
 void erase_screen();
 void go_to(int where);
+void crop_to_nonblank();
 
 /** drawing-related functions **/
 int change_style(char c);
diff --git a/main.c b/main.c
index c0f4b6b..195d8af 100644
--- a/main.c
+++ b/main.c
@@ -122,6 +122,9 @@ void commands(FILE *fc){
 					mode = VIS;
 					visual_box(fc);
 					break;
+				case 'C':
+					crop_to_nonblank();
+					break;
 				case 'q':
 					check_modified(fc);/** FALLTHROUGH **/
 				case 'Q':
diff --git a/screen.c b/screen.c
index 2e61acf..0c5f2d8 100644
--- a/screen.c
+++ b/screen.c
@@ -109,39 +109,64 @@ int is_yes(char c){
 
 /*** Screen management ***/
 
-void show_cursor(){
-	if (silent)
-		return;
-	printf("\033[%d;%df", y+1, x+1);
-	fflush(stdout);
+void ensure_line_length(int i, int len){
+	char *tmp;
+
+	if (screen[i].sz < len + 1){
+		tmp = realloc(screen[i].s, (len+1) * 2 * sizeof(char));
+		if (!tmp){
+			fprintf(stderr, "Unable to allocate string\n");
+			exit(1);
+		}
+		screen[i].s = tmp;
+		screen[i].sz = (len + 1) * 2;
+	}
 }
 
 
-void set_xy(int _x, int _y, char c){
+void alloc_line(int i){
+	char *tmp;
+
+	screen[i].sz = WIDTH+1;
+	tmp = malloc((screen[i].sz) * sizeof(char));
+	if (tmp == NULL){
+		fprintf(stderr, "unable to allocate line %d\n", i+1);
+		exit(1);
+	}
+	screen[i].s = tmp;
+	memset(screen[i].s, BG, screen[i].sz);
+	screen[i].lst = -1;
+	screen[i].s[0]='\0';
+}
+
+void ensure_num_lines(int n){
 	line_t *tmp;
-	if (_y >= num_lines){
-		tmp = realloc(screen, (_y + LONG_STEP)* sizeof(line_t));
+
+	if (n > num_lines){
+		tmp = realloc(screen, (n + LONG_STEP) * sizeof(line_t));
 		if (tmp == NULL){
 			fprintf(stderr, "Unable to allocate memory for more lines");
 			exit(1);
 		}
-		else while ( num_lines < _y + LONG_STEP){
-			screen[num_lines].sz = WIDTH+1;
-			screen[num_lines].s = malloc((screen[num_lines].sz) * sizeof(char));
-			if (screen[num_lines].s == NULL){
-				perror("allocating screen[num_lines].s");
-				exit(1);
-			}
-			memset(screen[num_lines].s, BG, screen[num_lines].sz);
-			screen[num_lines].lst = 0;
-			screen[num_lines].s[screen[num_lines].lst+1]='\0';
+		else while ( num_lines < n + LONG_STEP){
+			alloc_line(num_lines);
 			num_lines ++;
 		}
 	}
-	if (screen[_y].sz < _x + 2){
-		screen[_y].sz = (_x +2) * 2;
-		screen[_y].s = realloc(screen[_y].s, screen[_y].sz * sizeof(char));
-	}
+}
+
+
+void show_cursor(){
+	if (silent)
+		return;
+	printf("\033[%d;%df", y+1, x+1);
+	fflush(stdout);
+}
+
+
+void set_xy(int _x, int _y, char c){
+	ensure_num_lines(_y + 1);
+	ensure_line_length(_y, _x + 1);
 	while (screen[_y].lst<_x){
 		screen[_y].lst ++;
 		screen[_y].s[screen[_y].lst] = BG;
@@ -172,11 +197,9 @@ void update_current(){
 	fflush(stdout);
 }
 
-void erase_line(char *s){
-	while(*s){
-		*s = BG;
-		s++;
-	}
+void erase_line(int i){
+	screen[i].lst = -1;
+	screen[i].s[0] = '\0';
 }
 
 void erase_box(int x1, int y1, char c){
@@ -196,7 +219,7 @@ void erase_box(int x1, int y1, char c){
 void erase_screen(){
 	int i;
 	for(i=0;i<HEIGHT; i++)
-		erase_line(screen[i].s);
+		erase_line(i);
 }
 
 void check_bound(){
@@ -399,15 +422,7 @@ void init_screen(){
 		exit(1);
 	}
 	for (i=0; i<HEIGHT; i++){
-		screen[i].sz = WIDTH+1;
-		screen[i].s = malloc((screen[i].sz) * sizeof(char));
-		if (screen[i].s == NULL){
-			perror("allocating screen[i].s");
-			exit(1);
-		}
-		memset(screen[i].s, BG, screen[i].sz);
-		screen[i].lst = 0;
-		screen[i].s[screen[i].lst+1]='\0';
+		alloc_line(i);
 	}
 	hlines_sz= sizeof(hlines) -1;
 	vlines_sz= sizeof(vlines) -1;
@@ -417,3 +432,52 @@ void init_screen(){
 	reset_styles();
 }
 
+void find_nonblank_rect(int *x1, int *y1, int *x2, int *y2){
+
+	int i, j;
+	int first;
+	*x1= WIDTH; /** FIXME: replace with num_cols **/
+	*y1 = num_lines;
+	*x2 = *y2 = 0; 
+
+	for (i=0; i<num_lines; i++){
+		if (screen[i].lst < 0)
+			continue;
+		*y2 = i;
+		if (i < *y1)
+			*y1 = i;
+		if (screen[i].lst > *x2)
+			*x2 = screen[i].lst;
+		j = 0;
+		while(j <= screen[i].lst && isblank(first=screen[i].s[j]))
+			j++;
+		if (j < *x1)
+			*x1 = j;
+	}
+}
+
+void crop_to_rect(int x1, int y1, int x2, int y2){
+	int i;
+
+	for (i=0; i<= y2-y1; i ++){
+		ensure_line_length(i, screen[i+y1].lst);
+		sprintf(screen[i].s, "%s", screen[i+y1].s + x1);
+		screen[i].lst = screen[i+y1].lst - x1;
+	} 
+	while (i<=y2){
+		screen[i].lst = -1;
+		screen[i].s[0]= '\0';
+		i ++;
+	}
+}
+
+void crop_to_nonblank(){
+	int x1, x2, y1, y2;
+	find_nonblank_rect(&x1, &y1, &x2, &y2);
+#ifdef DEBUG
+	fprintf(stderr, "crop rectangle: (%d, %d)-(%d, %d)\n", x1, y1, x2, y2);
+#endif
+	crop_to_rect(x1, y1, x2, y2);
+	redraw();
+}
+
-- 
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