add -v (verbose) option, unset by default

headache_tool.ml

@@ -18,6 +18,11 @@ open Config_builtin
 open Headache
 
 
+(***************************************************************************)
+(** {2 Command-line options} *)
+
+let verbose = ref false
+
 (***************************************************************************)
 (** {2 Configuration files} *)
 
@@ -162,9 +167,9 @@ let create_header header header_width filename =
   let generator = find_generator filename in
   let skip_lst = find_skips filename in
   pipe_file (fun ic oc ->
-    let () = Skip.skip skip_lst ic (Some oc) in
+    let () = Skip.skip ~verbose:!verbose skip_lst ic (Some oc) in
     let line = generator.Model.remove ic in
-    let () = Skip.skip skip_lst ic (Some oc) in
+    let () = Skip.skip ~verbose:!verbose skip_lst ic (Some oc) in
     generator.Model.create oc header header_width;
     output_string oc line;
     copy ic oc
@@ -176,9 +181,9 @@ let remove_header filename =
   let generator = find_generator filename in
   let skip_lst = find_skips filename in
   pipe_file (fun ic oc ->
-    let () = Skip.skip skip_lst ic (Some oc) in
+    let () = Skip.skip ~verbose:!verbose skip_lst ic (Some oc) in
     let line = generator.Model.remove ic in
-    let () = Skip.skip skip_lst ic (Some oc) in
+    let () = Skip.skip ~verbose:!verbose skip_lst ic (Some oc) in
     output_string oc line;
     copy ic oc
   ) filename
@@ -188,7 +193,7 @@ let extract_header filename =
   let generator = find_generator filename in
   let skip_lst = find_skips filename in
   rd_pipe_file (fun ic ->
-    let () = Skip.skip skip_lst ic None in
+    let () = Skip.skip ~verbose:!verbose skip_lst ic None in
     generator.Model.extract ic
   ) filename
 
@@ -234,6 +239,10 @@ let main () =
   Arg.Unit (fun () -> action := Extract),
   "               Extract headers from files";
 
+  "-v",
+  Arg.Unit (fun () -> verbose := true),
+  "               Enable verbose output";
+
   ]
 
     anonymous

skip.ml

@@ -24,7 +24,7 @@ type param_skip = bool * regexp_skip
 ;;
 
 
-let skip skip_lst ic oc =
+let skip ~verbose skip_lst ic oc =
   let multiple_skip_lst,simple_skip_lst =
     List.partition (fun (_,(multiple,_)) -> multiple) skip_lst
   in
@@ -50,8 +50,9 @@ let skip skip_lst ic oc =
           with Not_found ->
             match_line simple_skip_lst;
         in
-        prerr_endline
-          ("Line : "^line^" skipped");
+        if verbose then
+          prerr_endline
+            ("Line : "^line^" skipped");
         (match oc with
          | None -> ()
          | Some oc ->