feature: saving previous selection

src/launch_state.c

@@ -0,0 +1,35 @@
+// Small file to save last selection
+
+#define STATE_PATH "/var/lib/lidm/state"
+
+#include <stdio.h>
+#include <stdbool.h>
+
+#include "launch_state.h"
+
+static void serialize_lstate(FILE* f, struct LaunchState st) {
+	fprintf(f, "%i;%i", st.user_opt, st.session_opt);
+}
+
+static void deserialize_lstate(FILE* f, struct LaunchState* st) {
+	fscanf(f, "%i;%i", &st->user_opt, &st->session_opt);
+}
+
+struct LaunchState read_launch_state() {
+	struct LaunchState state;
+	state.user_opt = 1;
+	state.session_opt = 1;
+	FILE* f = fopen(STATE_PATH, "r");
+	if(!f) return state;
+	deserialize_lstate(f, &state);
+	fclose(f);
+	return state;
+}
+
+bool write_launch_state(struct LaunchState state) {
+	FILE* f = fopen(STATE_PATH, "w");
+	if(!f) return false;
+	serialize_lstate(f, state);
+	fclose(f);
+	return true;
+}