From c7eb56724f4a0f33f621acccc58975cee44404f5 Mon Sep 17 00:00:00 2001
From: PS <slattery.peter.j@gmail.com>
Date: Sun, 28 Feb 2021 15:18:39 -0800
Subject: [PATCH] implemented setting the working directory by finding a data
 folder in an ancestor directory of the exe files path

---
 src/app/platform_win32/win32_foldhaus.cpp     | 79 +++++++++++++++++++
 .../platform_win32/win32_foldhaus_fileio.h    |  3 +-
 src/gs_libs/gs_types.cpp                      |  6 +-
 3 files changed, 84 insertions(+), 4 deletions(-)

diff --git a/src/app/platform_win32/win32_foldhaus.cpp b/src/app/platform_win32/win32_foldhaus.cpp
index c9208dc..df968c8 100644
--- a/src/app/platform_win32/win32_foldhaus.cpp
+++ b/src/app/platform_win32/win32_foldhaus.cpp
@@ -446,6 +446,83 @@ ReloadAndLinkDLL(win32_dll_refresh* DLL, context* Context, gs_work_queue* WorkQu
     return Success;
 }
 
+internal gs_const_string
+GetExePath(HINSTANCE HInstance, gs_thread_context ThreadContext)
+{
+    gs_const_string Result = {};
+    
+    u32 Error = 0;
+    u32 PathSize = MAX_PATH;
+    char* Path = PushArray(ThreadContext.Transient, char, PathSize);
+    DWORD Length = GetModuleFileNameA(HInstance, Path, PathSize);
+    
+    if (Length)
+    {
+        Error = GetLastError();
+        if (Error == ERROR_INSUFFICIENT_BUFFER) {
+            // PathSize wasn't long enough
+            // TODO(pjs): handle this case
+            InvalidCodePath;
+        }
+        
+        Result.Str = Path;
+        Result.Length = (u64)Length;
+    }
+    else
+    {
+        Error = GetLastError();
+        InvalidCodePath;
+    }
+    
+    return Result;
+}
+
+internal bool
+SetWorkingDirectory(HINSTANCE HInstance, gs_thread_context ThreadContext)
+{
+    bool Result = false;
+    
+    gs_const_string ExePath = GetExePath(HInstance, ThreadContext);
+    gs_string ScratchPath = PushString(ThreadContext.Transient, ExePath.Length + 128);
+    gs_string WorkingDirectory = PushString(ThreadContext.Transient, ExePath.Length + 128);
+    
+    while (WorkingDirectory.Length == 0)
+    {
+        s64 LastSlash = FindLastFromSet(ExePath, "\\/");
+        if (LastSlash < 0) break;
+        
+        ExePath = Substring(ExePath, 0, LastSlash);
+        PrintF(&ScratchPath, "%S\\data", ExePath);
+        NullTerminate(&ScratchPath);
+        
+        gs_file_info PathInfo = GetFileInfo(ThreadContext.FileHandler, ScratchPath.ConstString);
+        if (PathInfo.Path.Length > 0 &&
+            PathInfo.IsDirectory) {
+            PrintF(&WorkingDirectory, "%S", ExePath);
+            NullTerminate(&WorkingDirectory);
+        }
+    }
+    
+    if (WorkingDirectory.Length > 0)
+    {
+        OutputDebugStringA("Setting Working Directory\n");
+        OutputDebugStringA(WorkingDirectory.Str);
+        
+        Result = SetCurrentDirectory(WorkingDirectory.Str);
+        if (!Result)
+        {
+            u32 Error = GetLastError();
+            InvalidCodePath;
+        }
+    }
+    else
+    {
+        OutputDebugStringA("Error, no data folder found\n");
+    }
+    
+    return Result;
+}
+
 int WINAPI
 WinMain (
          HINSTANCE HInstance,
@@ -456,6 +533,8 @@ WinMain (
 {
     gs_thread_context ThreadContext = Win32CreateThreadContext();
     
+    if (!SetWorkingDirectory(HInstance, ThreadContext)) return 1;
+    
     MainWindow = Win32CreateWindow (HInstance, "Foldhaus", 1440, 768, HandleWindowEvents);
     Win32UpdateWindowDimension(&MainWindow);
     
diff --git a/src/app/platform_win32/win32_foldhaus_fileio.h b/src/app/platform_win32/win32_foldhaus_fileio.h
index bfb93ac..95163ea 100644
--- a/src/app/platform_win32/win32_foldhaus_fileio.h
+++ b/src/app/platform_win32/win32_foldhaus_fileio.h
@@ -197,7 +197,8 @@ Win32EnumerateDirectoryIntoTempList(gs_file_handler FileHandler, temp_file_list*
 {
     u32 FilesCount = 0;
     
-    u32 IndexOfLastSlash = FindLastFromSet(Path, "\\/");
+    s64 IndexOfLastSlash = FindLastFromSet(Path, "\\/");
+    Assert(IndexOfLastSlash >= 0);
     gs_const_string SearchPath = Substring(Path, 0, IndexOfLastSlash + 1);
     
     WIN32_FIND_DATA FindFileData;
diff --git a/src/gs_libs/gs_types.cpp b/src/gs_libs/gs_types.cpp
index 611d868..197c270 100644
--- a/src/gs_libs/gs_types.cpp
+++ b/src/gs_libs/gs_types.cpp
@@ -1573,12 +1573,12 @@ FindFirstFromSet(gs_const_string String, char* SetArray)
     return Result;
 }
 
-internal u64
+internal s64
 FindLastFromSet(gs_const_string String, char* SetArray)
 {
     gs_const_string Set = ConstString(SetArray);
-    u64 Result = String.Length - 1;
-    for(s64 At = Result; At >= 0; At--)
+    s64 Result = -1;
+    for(s64 At = String.Length - 1; At >= 0; At--)
     {
         char CharAt = String.Str[At];
         for (u64 SetAt = 0; SetAt < Set.Length; SetAt++)