From e127819f16d7c87d12b7a76696ca4d84b2c86ddb Mon Sep 17 00:00:00 2001
From: Alkaline Thunder <theplexgate@gmail.com>
Date: Fri, 28 Dec 2018 01:03:17 -0500
Subject: [PATCH] Add a filesystem context that gets loaded by the system

---
 ShiftOS/ShiftOS/FilesystemContext.cs | 66 ++++++++++++++++++++++++++++
 ShiftOS/ShiftOS/ShiftOS.csproj       |  1 +
 ShiftOS/ShiftOS/SystemContext.cs     | 14 ++++++
 3 files changed, 81 insertions(+)
 create mode 100644 ShiftOS/ShiftOS/FilesystemContext.cs

diff --git a/ShiftOS/ShiftOS/FilesystemContext.cs b/ShiftOS/ShiftOS/FilesystemContext.cs
new file mode 100644
index 0000000..2d68794
--- /dev/null
+++ b/ShiftOS/ShiftOS/FilesystemContext.cs
@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.IO;
+using System.Threading.Tasks;
+
+namespace ShiftOS
+{
+    public class FilesystemContext
+    {
+        private string _workingDirectory;
+
+        public FilesystemContext()
+        {
+            _workingDirectory = Path.Combine(Environment.CurrentDirectory, "ShiftFS");
+
+            // Create the directory if it does not exist.
+            if (!Directory.Exists(_workingDirectory))
+            {
+                Directory.CreateDirectory(_workingDirectory);
+            }
+        }
+
+        private string ResolveToAbsolutePath(string InPath)
+        {
+            if (!InPath.StartsWith("/"))
+                throw new FormatException();
+
+            Stack<string> PathParts = new Stack<string>();
+
+            foreach(string Part in InPath.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries))
+            {
+                if(Part == "..")
+                {
+                    // Pop the last part off the absolute path only if there's a part to pop.
+                    if(PathParts.Count == 0)
+                    {
+                        continue;
+                    }
+                    PathParts.Pop();
+                }
+                if(Part == ".")
+                {
+                    // Skip "current directory" marker.
+                    continue;
+                }
+                // Push the path part onto the stack.
+                PathParts.Push(Part);
+            }
+
+            // Resolution completed. Now let's get it into a string array.
+            string OutPath = "";
+            foreach(var Part in PathParts)
+            {
+                OutPath = "/" + Part;
+            }
+            return OutPath;
+        }
+
+        private string MapToEnvironmentPath(string InPath)
+        {
+            return Path.Combine(_workingDirectory, ResolveToAbsolutePath(InPath).Replace("/", Path.DirectorySeparatorChar.ToString()));
+        }
+    }
+}
diff --git a/ShiftOS/ShiftOS/ShiftOS.csproj b/ShiftOS/ShiftOS/ShiftOS.csproj
index d8e4c7b..8cbaa6a 100644
--- a/ShiftOS/ShiftOS/ShiftOS.csproj
+++ b/ShiftOS/ShiftOS/ShiftOS.csproj
@@ -52,6 +52,7 @@
     <Compile Include="Desktop.Designer.cs">
       <DependentUpon>Desktop.cs</DependentUpon>
     </Compile>
+    <Compile Include="FilesystemContext.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Skin.cs" />
diff --git a/ShiftOS/ShiftOS/SystemContext.cs b/ShiftOS/ShiftOS/SystemContext.cs
index 13c7561..ef6972f 100644
--- a/ShiftOS/ShiftOS/SystemContext.cs
+++ b/ShiftOS/ShiftOS/SystemContext.cs
@@ -11,6 +11,7 @@ namespace ShiftOS
     {
         private Desktop _desktop = null;
         private SkinContext _skinContext = null;
+        private FilesystemContext _filesystem = null;
         private int _codepoints = 0;
 
         private void LoadCurrentSkin()
@@ -19,6 +20,12 @@ namespace ShiftOS
             _skinContext = new SkinContext();
         }
 
+        private void LoadFilesystem()
+        {
+            Console.WriteLine("Loading filesystem context...");
+            this._filesystem = new FilesystemContext();
+        }
+
         public void Dispose()
         {
             _desktop = null;
@@ -29,6 +36,11 @@ namespace ShiftOS
             return this._codepoints;
         }
 
+        public FilesystemContext GetFilesystem()
+        {
+            return this._filesystem;
+        }
+
         public SkinContext GetSkinContext()
         {
             return this._skinContext;
@@ -46,6 +58,8 @@ namespace ShiftOS
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
 
+            this.LoadFilesystem();
+
             Console.WriteLine("Loading current skin...");
             this.LoadCurrentSkin();