Add quiet mode to lua_pictures

tools/lua/lua_pictures.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "LazyDecodeBitmap.h"
 #include "SkLua.h"
 #include "SkLuaCanvas.h"
@@ skipping 18 matching lines @@
 static const char gSummarizeFunc[] = "sk_scrape_summarize";
 
 // Example usage for the modulo flag:
 // for i in {0..5}; do lua_pictures --skpPath SKP_PATH -l YOUR_SCRIPT --modulo $i 6 &; done
 DEFINE_string(modulo, "", "[--modulo <remainder> <divisor>]: only run tests for which "
               "testIndex %% divisor == remainder.");
 DEFINE_string2(skpPath, r, "", "Read this .skp file or .skp files from this dir");
 DEFINE_string2(luaFile, l, "", "File containing lua script to run");
 DEFINE_string2(headCode, s, "", "Optional lua code to call at beginning");
 DEFINE_string2(tailFunc, s, "", "Optional lua function to call at end");
+DEFINE_bool2(quiet, q, false, "Silence all non-error related output");
 
 static SkPicture* load_picture(const char path[]) {
     SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
     SkPicture* pic = NULL;
     if (stream.get()) {
         pic = SkPicture::CreateFromStream(stream.get(), &sk_tools::LazyDecodeBitmap);
     }
     return pic;
 }
 
@@ skipping 41 matching lines @@
     const char* summary = gSummarizeFunc;
     if (!FLAGS_tailFunc.isEmpty()) {
         summary = FLAGS_tailFunc[0];
     }
 
     SkAutoGraphics ag;
     SkLua L(summary);
 
     for (int i = 0; i < FLAGS_luaFile.count(); ++i) {
         SkAutoDataUnref data(read_into_data(FLAGS_luaFile[i]));
-        SkDebugf("loading %s...\n", FLAGS_luaFile[i]);
+        if (!FLAGS_quiet) {
+            SkDebugf("loading %s...\n", FLAGS_luaFile[i]);
+        }
         if (!L.runCode(data->data(), data->size())) {
             SkDebugf("failed to load luaFile %s\n", FLAGS_luaFile[i]);
             exit(-1);
         }
     }
 
     if (!FLAGS_headCode.isEmpty()) {
         L.runCode(FLAGS_headCode[0]);
     }
 
@@ skipping 26 matching lines @@
         }
 
         for (int i = 0; i < paths.count(); i++) {
             if (moduloRemainder >= 0) {
                 if ((i % moduloDivisor) != moduloRemainder) {
                     continue;
                 }
                 moduloStr.printf("[%d.%d] ", i, moduloDivisor);
             }
             const char* path = paths[i].c_str();
-            SkDebugf("scraping %s %s\n", path, moduloStr.c_str());
+            if (!FLAGS_quiet) {
+                SkDebugf("scraping %s %s\n", path, moduloStr.c_str());
+            }
 
             SkAutoTUnref<SkPicture> pic(load_picture(path));
             if (pic.get()) {
                 SkAutoTUnref<SkLuaCanvas> canvas(
                                     new SkLuaCanvas(pic->width(), pic->height(),
                                                     L.get(), gAccumulateFunc));
 
                 call_canvas(L.get(), canvas.get(), path, gStartCanvasFunc);
                 canvas->drawPicture(*pic);
                 call_canvas(L.get(), canvas.get(), path, gEndCanvasFunc);
 
             } else {
                 SkDebugf("failed to load\n");
             }
         }
     }
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif