Parse section headings

src/main.c

@@ -40,8 +40,7 @@ static void parse_preamble(struct parser *p) {
 	str_t *name = str_create();
 	int section = -1;
 	uint32_t ch;
-	do {
-		ch = parser_getch(p);
+	while ((ch = parser_getch(p)) != UTF8_INVALID) {
 		if (isalnum(ch)) {
 			assert(str_append_ch(name, ch) != -1);
 		} else if (ch == '(') {
@@ -57,11 +56,81 @@ static void parse_preamble(struct parser *p) {
 			roff_macro(p, "TH", name->str, sec, date, NULL);
 			break;
 		}
-	} while (ch != UTF8_INVALID);
+	}
 	str_free(name);
 }
 
-static void output_preamble(struct parser *p) {
+static void parse_text(struct parser *p) {
+	uint32_t ch;
+	while ((ch = parser_getch(p)) != UTF8_INVALID) {
+		switch (ch) {
+		case '\\':
+			fprintf(p->output, "\\\\");
+			break;
+		default:
+			utf8_fputch(p->output, ch);
+			break;
+		}
+		if (ch == '\n') {
+			break;
+		}
+	}
+}
+
+static void parse_heading(struct parser *p) {
+	uint32_t ch;
+	int level = 1;
+	while ((ch = parser_getch(p)) != UTF8_INVALID) {
+		if (ch == '#') {
+			++level;
+		} else if (ch == ' ') {
+			break;
+		} else {
+			parser_fatal(p, "Invalid start of heading (probably needs a space)");
+		}
+	}
+	switch (level) {
+	case 1:
+		fprintf(p->output, ".SH ");
+		break;
+	case 2:
+		fprintf(p->output, ".SS ");
+		break;
+	default:
+		parser_fatal(p, "Only headings up to two levels deep are permitted");
+		break;
+	}
+	while ((ch = parser_getch(p)) != UTF8_INVALID) {
+		utf8_fputch(p->output, ch);
+		if (ch == '\n') {
+			break;
+		}
+	}
+}
+
+static void parse_document(struct parser *p) {
+	uint32_t ch;
+	while ((ch = parser_getch(p)) != UTF8_INVALID) {
+		switch (ch) {
+		case '#':
+			parse_heading(p);
+			break;
+		case '\n':
+			roff_macro(p, "P", NULL);
+			break;
+		default:
+			if (ch == '.') {
+				fprintf(p->output, "\\&.");
+			} else {
+				utf8_fputch(p->output, ch);
+			}
+			parse_text(p);
+			break;
+		}
+	}
+}
+
+static void output_scdoc_preamble(struct parser *p) {
 	// TODO: Add version here
 	fprintf(p->output, ".\\\" Generated by scdoc\n");
 	fprintf(p->output, ".\\\" Fix weird qutation marks:\n");
@@ -89,7 +158,8 @@ int main(int argc, char **argv) {
 		.line = 1,
 		.col = 1
 	};
-	output_preamble(&p);
+	output_scdoc_preamble(&p);
 	parse_preamble(&p);
+	parse_document(&p);
 	return 0;
 }