Input/Output dir options

dstep/Configuration.d

@@ -20,6 +20,9 @@ struct Configuration
     /// array of file names to translate to D
     string[] inputFiles;
 
+    /// in case if there are many input files in one dir
+    bool isInputFromDir;
+
     /// expected programming language of input files
     Language language;
 
@@ -34,8 +37,11 @@ struct Configuration
     /// array of parameters needed to be forwarded to clang driver
     string[] clangParams;
 
-    /// output file name or folder (in case there are many input files)
-    string output;
+    /// output file name or folder
+    string outputPath;
+
+    /// in case there are many input files or dir output option provided
+    bool isOutputToDir;
 
     /// package name
     @("package", "Use <package> as package name.")

dstep/driver/Application.d

@@ -125,16 +125,16 @@ class Application
 
         // when only one input file is supplied, -o argument is
         // interpreted as file path, otherwise as base directory path
-        if (inputFiles.length == 1)
+        if (!config.isOutputToDir)
         {
-            return [config.output.empty
+            return [config.outputPath.empty
                 ? makeDefaultOutputFile(inputFiles.front, false)
-                : config.output];
+                : config.outputPath];
         }
         else
         {
             alias fmap = file => Path.buildPath(
-                config.output,
+                config.outputPath,
                 makeDefaultOutputFile(file, false));
 
             return inputFiles.map!fmap.array;

dstep/driver/CommandLine.d

@@ -67,7 +67,9 @@ auto parseCommandLine(string[] args)
         args,
         std.getopt.config.passThrough,
         std.getopt.config.caseSensitive,
-        "output|o", &config.output,
+        "input-from-dir|I", &config.isInputFromDir,
+        "output|o", &config.outputPath,
+        "output-to-dir|O", &config.isOutputToDir,
         "objective-c", &forceObjectiveC,
         "language|x", &parseLanguage,
         makeGetOptArgs!config);
@@ -84,6 +86,26 @@ auto parseCommandLine(string[] args)
             config.inputFiles ~= arg;
     }
 
+    if(config.isInputFromDir)
+    {
+        import std.exception : enforce;
+        import std.file;
+        import std.algorithm;
+        import std.algorithm.iteration;
+        import std.array;
+
+        enforce!DStepException(config.inputFiles.length == 1,
+            "dstep: error: must supply only one input directory\n");
+
+        config.inputFiles = dirEntries(config.inputFiles[0], SpanMode.depth)
+            .filter!(f => f.name.endsWith(".h"))
+            .map!(a => a.name)
+            .array;
+    }
+
+    if(config.isInputFromDir || config.inputFiles.length > 1)
+        config.isOutputToDir = true;
+
     // Post-processing of CLI
 
     import std.algorithm : canFind;
@@ -239,6 +261,8 @@ void showHelp (Configuration config, GetoptResult getoptResult)
     auto customEntries = [
         Entry("-o, --output <file>", "Write output to <file>."),
         Entry("-o, --output <directory>", "Write all the files to <directory>, in case of multiple input files."),
+        Entry("-O, --output-to-dir", "Force write files to <directory>."),
+        Entry("-I, --input-from-dir", "Force to treat <input> as directory. Reads only *.h files."),
         Entry("-ObjC, --objective-c", "Treat source input file as Objective-C input."),
         Entry("-x, --language", "Treat subsequent input files as having type <language>.")];