From a0d2bf8bebb6dd4121a2a00b7ee7c340c0dfea9f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Sun, 8 Nov 2020 19:04:25 +0100
Subject: support hidden escape codes for bold, italic

---
 tea.c | 82 ++++++++++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 51 insertions(+), 31 deletions(-)

diff --git a/tea.c b/tea.c
index 3797c21..c0065be 100644
--- a/tea.c
+++ b/tea.c
@@ -24,12 +24,17 @@ char *src; /* source text */
 int src_l;
 int src_s;
 
-int *breaks; /* positions of visual line breaks in source text */
-             /* i.e. breaks[src index] = 1 if line broken before, else 0 */
+int *types; /* type of each character in source text */
+            /* types[src_i] = BREAK if last character of visual line */
+            /*              = HIDDEN if hidden inline */
+            /*              = NORMAL otherwise */
+
+#define NORMAL 0
+#define BREAK 1
+#define HIDDEN 2
 
 int x, y; /* current cursor position */
 int w, h; /* terminal width, height */
-int margin = 10;
 
 int current = -1; /* currently selected item */
 int xorig, yorig; /* original cursor position in cols, rows */
@@ -102,11 +107,15 @@ int left() {}
 
 void breakline() {
 	prn("\r\n");
-	breaks[src_l + 1] = 1;
-	x = margin;
+	types[src_l] = 1;
+	x = 1;
 	if (y == h) yorig--;
 	else y++;
-	prn(CSI "%d;%dH", y, margin);
+	prn(CSI "1G");
+}
+
+void hide() {
+	types[src_l] = HIDDEN;
 }
 
 void addc(char c) {
@@ -119,11 +128,11 @@ void addc(char c) {
 		if (tmp == NULL) rerr(1, "realloc");
 		src = tmp;
 
-		tmp2 = realloc(breaks, src_s * sizeof(int));
-		if (breaks == NULL) err(1, "malloc");
-		breaks = tmp2;
+		tmp2 = realloc(types, src_s * sizeof(int));
+		if (types == NULL) err(1, "malloc");
+		types = tmp2;
 		for (i = src_s - 50; i < src_s; i++)
-			breaks[i] = 0;
+			types[i] = 0;
 	}
 	src[++src_l] = c;
 	src[src_l + 1] = '\0';
@@ -144,10 +153,10 @@ int main() {
 	if (src == NULL) err(1, "malloc");
 	src_l = -1;
 
-	breaks = malloc(src_s * sizeof(int));
-	if (breaks == NULL) err(1, "malloc");
+	types = malloc(src_s * sizeof(int));
+	if (types == NULL) err(1, "malloc");
 	for (i = 0; i < src_s; i++)
-		breaks[i] = 0;
+		types[i] = 0;
 
 	ttyfd = open("/dev/tty", O_RDWR);
 	if (ttyfd == -1) rerr(1, "open");
@@ -210,8 +219,8 @@ int main() {
 		y = y - r;
 
 	/* restore original cursor position (CUP) */
-	prn(CSI "%d;%dH", yorig, margin);
-	x = margin;
+	prn(CSI "%d;1H", yorig);
+	x = 1;
 	y = yorig;
 
 	dot = false;
@@ -219,12 +228,28 @@ int main() {
 		switch (c) {
 		case '\033': /* escape */
 			read(ttyfd, &c, 1);
-			if (c != '[') break;
-			read(ttyfd, &c, 1);
-			if (c == 'A') up();
-			if (c == 'B') down();
-			if (c == 'C') right();
-			if (c == 'D') left();
+			if (c == 'b') {
+				addc('\\'); hide();
+				addc('f'); hide();
+				addc('B'); hide();
+				prn(CSI "1m");
+			} else if (c == 'i') {
+				addc('\\'); hide();
+				addc('f'); hide();
+				addc('I'); hide();
+				prn(CSI "3m");
+			} else if (c == 'r') {
+				addc('\\'); hide();
+				addc('f'); hide();
+				addc('R'); hide();
+				prn(CSI "0m");
+			} else if (c == '[') {
+				read(ttyfd, &c, 1);
+				if (c == 'A') up();
+				if (c == 'B') down();
+				if (c == 'C') right();
+				if (c == 'D') left();
+			}
 			break;
 		case 3: /* ctrl-c */
 			goto quit;
@@ -235,24 +260,19 @@ int main() {
 			prn(CSI "0m");
 			break;
 		case 127: /* backspace */
-			if (x == margin || x == 1) break;
+			if (x == 1) break;
 			prn("\b");
+			while (types[src_l] == HIDDEN)
+				delc();
 			delc();
 			x--;
-			if (x == 1) {
+			if (x == 1)
 				prn(CSI "0m");
-				for (i = 1; i < margin; i++)
-					prn(" ");
-				x = margin;
-			}
 			break;
 		default:
 			if (iscntrl(c)) break;
-			if (x == margin && c == '.') {
-				prn(CSI "%d;%dH", y, 1);
-				x = 1;
+			if (x == 1 && c == '.')
 				prn(CSI "2m");
-			}
 			addc(c);
 			if (x + 1 > w) breakline();
 			prn("%c", c);
-- 
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