Add shared header file

Author: hyperupcall

d.h

@@ -0,0 +1,36 @@
+#include <stdbool.h>
+#include <stddef.h>
+
+typedef struct Group {
+	char const *name;
+	struct Entry **entries;
+} Group;
+
+typedef struct Entry {
+	char const *category;
+	char const *source;
+	char const *destination;
+} Entry;
+
+// clang-format off
+#define Home(path, category) { \
+	.source = Src category path, \
+	.destination = Dst path \
+}
+#define Config(path, category) { \
+	.source = Src category ".config/" path, \
+	.destination = Dst ".config/" path \
+}
+#define Data(path, category) { \
+	.source = Src category ".local/share/" path, \
+	.destination = Dst ".local/share/" path \
+}
+#define Done { \
+	.source = NULL, \
+	.destination = NULL \
+}
+// clang-format on
+
+#define HomeEntry(path, category) { Home(path, category), Done }
+#define ConfigEntry(path, category) { Config(path, category), Done }
+#define DataEntry(path, category) { Data(path, category), Done }