????

Program.cs

@@ -1,6 +1,28 @@
 using System.Text.RegularExpressions;
 
-ProcessDirectory(Directory.GetCurrentDirectory());
+var DEBUG = false;
+
+string[] clargs = Args.ToArray();
+
+var dir = Directory.GetCurrentDirectory();
+
+if (clargs.Length > 0) dir = Path.Combine(dir, clargs[0]);
+
+dir = Path.GetFullPath(dir);
+
+if (File.Exists(dir))
+{
+    FormatBuildFile(dir);
+}
+else if (Directory.Exists(dir))
+{
+    ProcessDirectory(dir);
+}
+else
+{
+    Console.Error.WriteLine($"Invalid Directory/File argument: '{dir}'");
+}
+
 
 void ProcessDirectory(string baseDir) {
     foreach (var subDir in Directory.EnumerateFileSystemEntries(baseDir))
@@ -30,6 +52,13 @@ void FormatBuildFile(string filename)
 
 string FormatFile(string filename, string content)
 {
+    if (DEBUG)
+    {
+        Console.WriteLine("");
+        Console.WriteLine("============================== "+filename+" ==============================");
+        Console.WriteLine("");
+    }
+    
     var depsRex = new Regex(@"^\s*deps\s*=\s*\[(\s*\n)?(?<deps>[^\]\)]+?)[\s\r\n]*\]", RegexOptions.Multiline);    
     
     var matches = depsRex.Matches(content);
@@ -43,7 +72,31 @@ string FormatFile(string filename, string content)
         
         var newDeps = FormatDeps(filename, linenum, oldDeps);
 
-        if (oldDeps != newDeps) content = content.Replace(oldDeps, newDeps);
+
+
+        if (oldDeps != newDeps)
+        {
+            if (DEBUG)
+            {
+                Console.WriteLine("+++++++++++++ OLD +++++++++++++++++");
+                Console.WriteLine(oldDeps);
+                Console.WriteLine("++++++++++++++ NEW ++++++++++++++++");
+                Console.WriteLine(newDeps);
+                Console.WriteLine("++++++++++++++++++++++++++++++");
+                Console.WriteLine();
+            }
+            else
+            {
+                content = content.Replace(oldDeps, newDeps);
+            }
+        }
+        else
+        {
+            if (DEBUG)
+            {
+                Console.WriteLine("  ( no changes )");
+            }
+        }
     }
     
     return content;
@@ -53,22 +106,36 @@ string FormatDeps(string filename, int linenum, string deps)
 {
     var lines = deps.Split("\n");
     if (lines.Length == 0) return deps;
+    if (lines.Length == 1) return deps;
 
     var allindents = lines.Where(l => !string.IsNullOrWhiteSpace(l)).Select(l => l.Length - l.TrimStart().Length).Distinct().ToList();
     if (allindents.Count != 1)
     {
+        foreach (var l in lines) Console.Error.WriteLine(l);
         throw new Exception($"Different deps-indents in file {filename}:{linenum} ( [ {string.Join(", ", allindents)} ] )");
     }
 
     var indent = new string(' ',  allindents[0]);
 
-    var result = lines.
+    var data = lines.
         Where(p => !string.IsNullOrWhiteSpace(p)).
         Select(p => GetDepGroup(filename, linenum, p)).
         GroupBy(p => p.group).
         OrderBy(p => p.Key).
-        SelectMany(p => p.OrderBy(q => q.clean).Select(q => $"{indent}\"{q.clean}\",").Append("")).
-        Aggregate((a, b) => a + "\n" + b);
+        ToList();
+
+    var result = "";
+    var first = true;
+    for (var i = 0; i < data.Count; i++)
+    {
+        foreach (var d in data[i])
+        {
+            if (!first) result += "\n";
+            result += $"{indent}\"{d.clean}\",";
+            first = false;
+        }
+        if (i+1 < data.Count) result += "\n";
+    }
     
     return result;
 }