Add verbose flag

bin/Extract.ml

@@ -1,8 +1,8 @@
 open Lib
 
-let extract ~duplicatesAllowed ~paths =
+let extract ~duplicatesAllowed ~verbose ~paths =
   try
-    let messages = Extractor.extract ~duplicatesAllowed paths in
+    let messages = Extractor.extract ~duplicatesAllowed ~verbose paths in
     let json = `List (messages |> List.map Message.toJson) in
     json |> Yojson.Basic.pretty_to_channel stdout;
     print_newline ()
@@ -25,19 +25,31 @@ type options = {
   mutable showVersion: bool;
   mutable paths: string list;
   mutable duplicatesAllowed: bool;
+  mutable verbose: bool;
 }
 
 let run () =
-  let options = {showVersion = false; paths = []; duplicatesAllowed = false} in
+  let options =
+    {
+      showVersion = false;
+      paths = [];
+      duplicatesAllowed = false;
+      verbose = false;
+    }
+  in
   let processInputFilename filename =
     options.paths <- filename :: options.paths
   in
   let allowDuplicates () = options.duplicatesAllowed <- true in
   let showVersion () = options.showVersion <- true in
+  let verbose () = options.verbose <- true in
 
   let args =
     [
       ("-v", Arg.Unit showVersion, "shows the program version");
+      ( "--verbose",
+        Arg.Unit verbose,
+        "log out some information like the current processed file path" );
       ( "--allow-duplicates",
         Arg.Unit allowDuplicates,
         "allows messages with identical `id` props if `defaultMessage` props \
@@ -51,6 +63,7 @@ let run () =
   match options with
   | {showVersion = true} -> print_endline Version.version
   | {paths = []} -> Arg.usage args usage
-  | {paths; duplicatesAllowed} -> extract ~duplicatesAllowed ~paths
+  | {paths; duplicatesAllowed; verbose} ->
+    extract ~duplicatesAllowed ~verbose ~paths
 
 let () = run ()

lib/Extractor.ml

@@ -2,7 +2,7 @@ exception PathNotFound of string
 exception DuplicateMessageId of string
 exception DefaultMessageNotMatching of string
 
-let extract ?(duplicatesAllowed = false) paths =
+let extract ?(duplicatesAllowed = false) ?(verbose = false) paths =
   let messages = ref StringMap.empty in
   let iterator =
     ExtractionIterator.getIterator (fun message ->
@@ -21,6 +21,7 @@ let extract ?(duplicatesAllowed = false) paths =
   in
   let extractMessages ast = iterator.structure iterator ast in
   let processFile path =
+    if verbose then Printf.eprintf "Processing file: %s\n%!" path;
     let channel = open_in_bin path in
     let src = really_input_string channel (in_channel_length channel) in
     close_in channel;