List files and fix scrolling

src/basic/basic.h

@@ -741,6 +741,7 @@ UTF8Iter IterateUTF8Ex(char *data, int64_t len);
 UTF8Iter IterateUTF8(char *data);
 UTF8Iter IterateUTF8(String string);
 
+bool IsAlphabetic(char a);
 #define FmtString(string) (int)(string).len, (string).data
 bool        AreEqual(String a, String b, unsigned ignore_case = false);
 int64_t     CreateWidecharFromChar(wchar_t *buffer, int64_t buffer_size, char *in, int64_t inlen);

src/basic/filesystem.h

@@ -31,6 +31,8 @@ String GetExeDir(Allocator allocator);
 bool   FileExists(String path);
 bool   IsDir(String path);
 bool   IsFile(String path);
+String GetWorkingDir(Allocator arena);
+bool   IsAbsolute(String path);
 
 struct Process {
     bool   is_valid;

src/basic/win32.cpp

@@ -299,3 +299,21 @@ bool IsFile(String path) {
     bool  is_file  = (dwAttrib & FILE_ATTRIBUTE_DIRECTORY) == 0;
     return dwAttrib != INVALID_FILE_ATTRIBUTES && is_file;
 }
+
+String GetWorkingDir(Allocator arena) {
+    wchar_t wbuffer[1024];
+    DWORD   wsize = GetCurrentDirectoryW(Lengthof(wbuffer), wbuffer);
+    Assert(wsize != 0);
+    Assert(wsize < 1022);
+    wbuffer[wsize++] = '/';
+    wbuffer[wsize]   = 0;
+
+    String path = ToString(arena, wbuffer, wsize);
+    NormalizePathInPlace(path);
+    return path;
+}
+
+bool IsAbsolute(String path) {
+    bool result = path.len > 3 && IsAlphabetic(path.data[0]) && path.data[1] == ':' && path.data[2] == '/';
+    return result;
+}