Add: Discovery phase added

Add: StringPool, StringView

src/io.h

@@ -0,0 +1,28 @@
+#ifndef IO_H
+#define IO_H
+
+#include "string.h"
+
+typedef struct Arena Arena;
+
+struct DirEntry
+{
+  StringView path;
+  unsigned char type;
+};
+
+struct DirOpContext
+{
+  Arena* a_f;
+  StringPool* sp;
+};
+
+typedef struct DirEntry DirEntry;
+typedef struct DirOpContext DirOpContext;
+
+// a should not contain a trailing slash
+StringView path_concat_ss(StringPool* sp, StringView* a, StringView* b);
+
+size_t dir_get_recursive(DirOpContext* doc, StringView* p);
+
+#endif