dotnet disk* simplify

Author: scivision

+stdlib/+dotnet/disk_available.m

@@ -2,14 +2,6 @@
 
 function i = disk_available(file)
 
-% Windows needs exists() not just strempty()
-if stdlib.has_dotnet() && stdlib.exists(file)
-  % absolutizing is necessary for Windows especially
-  i = System.IO.DriveInfo(System.IO.Path.GetFullPath(file)).AvailableFreeSpace();
-  % https://learn.microsoft.com/en-us/dotnet/api/system.io.driveinfo.availablefreespace
-  i = uint64(i);
-else
-  i = missing;
-end
+i = disk_usage(file, 'available');
 
 end

+stdlib/+dotnet/disk_capacity.m

@@ -2,14 +2,6 @@
 
 function i = disk_capacity(file)
 
-% Windows needs exists() not just strempty()
-if stdlib.has_dotnet() && stdlib.exists(file)
-  % absolutizing is necessary for Windows especially
-  i = System.IO.DriveInfo(System.IO.Path.GetFullPath(file)).TotalSize();
-  % https://learn.microsoft.com/en-us/dotnet/api/system.io.driveinfo.totalsize
-  i = uint64(i);
-else
-  i = missing;
-end
+i = disk_usage(file, 'capacity');
 
 end

+stdlib/+dotnet/private/disk_usage.m

@@ -0,0 +1,19 @@
+function i = disk_usage(file, v)
+
+% Windows needs exists() not just strempty()
+if stdlib.has_dotnet() && stdlib.exists(file)
+  % absolutizing is necessary for Windows especially
+  di = System.IO.DriveInfo(System.IO.Path.GetFullPath(file));
+
+  switch v
+    case 'available', i = di.AvailableFreeSpace();
+    case 'capacity', i = di.TotalSize();
+    otherwise, error('stdlib:dotnet:disk_usage:valueError', 'unknown disk_usage property %s', v)
+  end
+  % https://learn.microsoft.com/en-us/dotnet/api/system.io.driveinfo.totalsize
+  i = uint64(i);
+else
+  i = missing;
+end
+
+end