PowerShell script for listing file type counts in JAR files

listfiles.ps1

@@ -0,0 +1,53 @@
+param($dir)
+
+# Initialize an empty dictionary to store extension counts
+$extensionCounts = @{}
+
+# Example paths in format (<jar file name>: <entry path>) found for each extension
+$exemplePaths = @{}
+
+# Get all JAR files in the directory
+Get-ChildItem -Path $dir -Filter "*.jar" | ForEach-Object {
+
+  # Extract the JAR file path
+  $jarPath = $_.FullName
+  $jarName = $_.Name
+
+  # Open the JAR file for reading using ZipFile
+  $zipFile = [IO.Compression.ZipFile]::OpenRead($jarPath)
+
+  # Loop through each entry in the ZIP file
+  $zipFile.Entries | Where-Object { !$_.IsDirectory } | ForEach-Object {
+    # Get the entry name and potential extension
+    $entryName = $_.Name
+    $entryPath = $_.FullName
+
+    # Check if the entry name contains a dot (indicating extension)
+    # Extract the extension (lowercase for case-insensitivity)
+    $extension = $entryName.Split('.')[-1].ToLower()
+
+    # Check if the extension is not empty
+    if (($extension -ne "") -and ($extension -ne $entryName)) {
+      # Add or increment the count for the extension in the dictionary
+      if ($extensionCounts.ContainsKey($extension)) {
+        $extensionCounts[$extension]++
+      } else {
+        $extensionCounts[$extension] = 1
+        $exemplePaths[$extension] = $jarName + ": " + $entryPath
+      }
+    }
+  }
+
+  # Close the ZIP file (important for proper resource handling)
+  $zipFile.Dispose()
+}
+
+$keysSorted = $extensionCounts.GetEnumerator() | Sort-Object -Property Value -Descending
+
+# Display the extension counts
+foreach ($ext in $keysSorted) {
+  if ($ext.Value -gt 1) {
+      Write-Host "$($ext.Key): $($ext.Value)"
+    Write-Host "> Example: $($exemplePaths[$ext.Key])"
+  }
+}