Implement bold and underline

include/util.h

@@ -9,6 +9,13 @@ struct parser {
 	int line, col;
 	int qhead;
 	uint32_t queue[32];
+	uint32_t flags;
+};
+
+enum formatting {
+	FORMAT_BOLD = 1,
+	FORMAT_UNDERLINE = 2,
+	FORMAT_LAST = 4,
 };
 
 void parser_fatal(struct parser *parser, const char *err);

scdoc.5.scd

@@ -41,7 +41,7 @@ or \_underlined\_.
 
 # INDENTATION
 
-You may indent lines with tab characters ("\t") to indent them by 4 spaces in
+You may indent lines with tab characters (*\\t*) to indent them by 4 spaces in
 the output. Indented lines may not contain headers.
 
 # LISTS

src/main.c

@@ -60,6 +60,22 @@ static void parse_preamble(struct parser *p) {
 	str_free(name);
 }
 
+static void parse_format(struct parser *p, enum formatting fmt) {
+	char formats[FORMAT_LAST] = {
+		[FORMAT_BOLD] = 'B',
+		[FORMAT_UNDERLINE] = 'I',
+	};
+	if (p->flags) {
+		if ((p->flags & ~fmt)) {
+			parser_fatal(p, "Cannot nest inline formatting.");
+		}
+		fprintf(p->output, "\\fR");
+	} else {
+		fprintf(p->output, "\\f%c", formats[fmt]);
+	}
+	p->flags ^= fmt;
+}
+
 static void parse_text(struct parser *p) {
 	uint32_t ch;
 	int i = 0;
@@ -75,6 +91,12 @@ static void parse_text(struct parser *p) {
 				utf8_fputch(p->output, ch);
 			}
 			break;
+		case '*':
+			parse_format(p, FORMAT_BOLD);
+			break;
+		case '_':
+			parse_format(p, FORMAT_UNDERLINE);
+			break;
 		case '.':
 			if (!i) {
 				// Escape . if it's the first character