term: implement platform-independent console text colour/formatting

term/paragraph.c

@@ -38,7 +38,24 @@ static unsigned int extract_line(
 	unsigned int i;
 	for (i = 0; start[i]; i++) {
 		if (start[i] == '\033') {
-			while (!isalpha(start[i++])) {
+			while (start[i] && !isalpha(start[i])) {
+				delta++;
+				i++;
+			}
+
+			delta++;
+		}
+
+		if (start[i] == '[') {
+			if (start[i + 1] == '[') {
+				delta++;
+				i++;
+
+				continue;
+			}
+
+			while (start[i] && start[i] != ']') {
+				i++;
 				delta++;
 			}
 
@@ -137,7 +154,8 @@ static b_status print_paragraph_tty(
 			indent(format, fp, left_margin, false);
 		}
 
-		b_fprintf(fp, "%s\n", b_string_ptr(line));
+		b_fputs(b_string_ptr(line), fp);
+		fputc('\n', fp);
 		need_indent = true;
 	}