From 8941f5dc629c99b183ec09e79b838dc10c86a0ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Sun, 8 Nov 2020 01:27:06 +0100
Subject: handle manual line breaks, arbitrary input length

---
 tea.c | 57 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 40 insertions(+), 17 deletions(-)

diff --git a/tea.c b/tea.c
index 5839ef9..940c310 100644
--- a/tea.c
+++ b/tea.c
@@ -24,9 +24,8 @@ char *src; /* source text */
 int src_l;
 int src_s;
 
-int *breaks; /* position of broken lines in source text */
-             /* (1 where a character is displayed on a new line,
-		 0 otherwise.) */
+int *breaks; /* positions of visual line breaks in source text */
+             /* i.e. breaks[src index] = 1 if line broken before, else 0 */
 
 int x, y; /* current cursor position */
 int w, h; /* terminal width, height */
@@ -101,31 +100,44 @@ int down() { }
 int right() {}
 int left() {}
 
+void breakline() {
+	prn("\r\n");
+	breaks[src_l + 1] = 1;
+	x = margin + 1;
+	prn(CSI "%dC", margin - 1);
+	if (y == h) yorig--;
+	else y++;
+}
+
 void addc(char c) {
-	if (c != '\n' && x + 1 > w) {
-		prn("\r\n");
-		breaks[src_l + 1] = 1;
-		x = margin + 1;
-		prn(CSI "%dC", margin - 1);
-		if (y == h) yorig--;
-		else y++;
-	} else
-		x++;
+	char *tmp;
+	int i, *tmp2;
+
+	if (c != '\n' && x + 1 > w) breakline();
+	else x++;
 	if (src_l + 2 > src_s) {
-		fprintf(stderr, "too big!\n");
-		exit(1);
+		src_s += 50;
+		tmp = realloc(src, (src_s + 1) * sizeof(char));
+		if (tmp == NULL) rerr(1, "realloc");
+		src = tmp;
+
+		tmp2 = realloc(breaks, src_s * sizeof(int));
+		if (breaks == NULL) err(1, "malloc");
+		breaks = tmp2;
+		for (i = src_s - 50; i < src_s; i++)
+			breaks[i] = 0;
 	}
 	src[++src_l] = c;
 	src[src_l + 1] = '\0';
-	prn("%c", c);
 }
 
 int main() {
+	bool dot;
 	char c, *line, *p, *tmp;
 	int i, line_s, r;
 	struct winsize ws;
 
-	src_s = 1000;
+	src_s = 100;
 	src = malloc((src_s + 1) * sizeof(char));
 	if (src == NULL) err(1, "malloc");
 	src_l = -1;
@@ -197,9 +209,10 @@ int main() {
 
 	/* restore original cursor position (CUP) */
 	prn(CSI "%d;%dH", yorig, xorig + margin - 1);
-	x = xorig + margin - 1;
+	x = margin + 1;
 	y = yorig;
 
+	dot = false;
 	while (read(ttyfd, &c, 1) != 0) {
 		switch (c) {
 		case '\033': /* escape */
@@ -214,9 +227,19 @@ int main() {
 		case 3: /* ctrl-c */
 			goto quit;
 			break;
+		case 13: /* enter */
+			addc('\n');
+			breakline();
+			prn(CSI "0m");
+			break;
 		default:
 			if (iscntrl(c)) break;
+			if (x == margin + 1 && c == '.') {
+				prn(CSI "%dD", margin - 1);
+				prn(CSI "2m");
+			}
 			addc(c);
+			prn("%c", c);
 			break;
 		}
 	}
-- 
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