getting fancy with command line args

src/args.h

@@ -0,0 +1,26 @@
+#ifndef ARGS_H
+#define ARGS_H
+
+#include <time.h>
+
+typedef enum {
+	MODE_TODAY,
+	MODE_ALL,
+	MODE_DATE,
+	MODE_YEAR
+} OutputMode;
+
+typedef struct {
+	OutputMode mode;
+	struct tm target_date;
+	int target_year;
+} ProgramArgs;
+
+// Parse command line arguments
+// Returns 0 on success, -1 on error, 1 if help was shown
+int parse_args(int argc, char *argv[], ProgramArgs *args);
+
+// Print usage information
+void print_usage(const char *program_name);
+
+#endif // ARGS_H