1 files changed, 103 insertions, 0 deletions
diff --git a/gn.c b/gn.c
new file mode 100644
index 0000000..f3286b9
--- /dev/null
+++ b/gn.c
@@ -0,0 +1,103 @@
+#include <ctype.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+typedef enum mode {
+	NONE,
+	LIST,
+} mode;
+
+typedef enum types {
+	HEADING,
+	DATE,
+	TODO,
+	BULLET,
+} types;
+
+typedef struct token {
+	char data[256];
+	types type;
+} token;
+
+mode m = NONE;
+
+token tokens[1024];
+int tokcount = 0;
+	
+void eprint(char *msg) {
+	fprintf(stderr, "error: %s\n", msg);
+	exit(1);
+}
+
+void printashtml(token t) {
+	char *start, *end;
+	switch (t.type) {
+		case HEADING: start = "<h1>"; end = "</h1>"; break;
+		case DATE: start = "<h2>"; end = "</h2>"; break;
+		case TODO: start = "<h3>"; end = "</h3>"; break;
+		case BULLET: start = "<p>"; end = "</p>"; break;
+	}
+	printf("%s%s%s\n", start, t.data, end);
+}
+
+char *stripwhitespace(char *expr) {
+	while (isblank(expr[0])) expr++;
+	return expr;
+}
+
+int readuntil(char *file, int off, char end, types t) {
+	int j = 0;
+	char tok[256];
+
+	off++;
+	while (file[off] != end) {
+		if (file[off] == 0) eprint("Never closed expression!") ;
+		tok[j] = file[off];
+		off++;
+		j++;
+	}
+
+	tok[j] = 0;
+
+	memcpy(tokens[tokcount].data, stripwhitespace(tok),  256);
+	tokens[tokcount].type = t;
+	tokcount++;
+
+	return off;
+}
+
+int main(int argc, char **argv) {
+	for (int i = 0; i < argc && argc != 1; i++) {
+		if (strcmp(argv[i], "-l") == 0) m = LIST;
+	}
+
+	char file[INT16_MAX];
+	int i;
+	char c;
+	while ((c = getchar()) != EOF) {
+		file[i] = c;
+		i++;
+	}
+	file[i] = 0;
+
+	for (i = 0; i < strlen(file); i++) {
+		switch (file[i]) {
+			case '*': i = readuntil(file, i, '*', HEADING); break;
+			case '[': i = readuntil(file, i, ']', DATE); break;
+			case '{': i = readuntil(file, i, '}', TODO); break;
+			case '-': i = readuntil(file, i, '\n', BULLET); break;
+		}
+
+	}
+
+	switch (m) {
+		case LIST:
+			for (int i = 0; i < tokcount; i++)
+				if (tokens[i].type == HEADING) printf("%s\n", tokens[i].data);
+			break;
+		case NONE: return 0;
+	}
+	return 0;
+}