support output to STDOUT using '-' as output filename, added --quiet option

Author: Sam

src/HTMLRenderer/general.cc

@@ -124,7 +124,9 @@ void HTMLRenderer::process(PDFDoc *doc)
             break;
         }
 
-        cerr << "Working: " << (i-param.first_page) << "/" << page_count << '\r' << flush;
+        if (!param.quiet) {
+            cerr << "Working: " << (i-param.first_page) << "/" << page_count << '\r' << flush;
+        }
 
         if(param.split_pages)
         {
@@ -153,9 +155,10 @@ void HTMLRenderer::process(PDFDoc *doc)
             f_curpage = nullptr;
         }
     }
-    if(page_count >= 0)
+    if (!param.quiet && page_count >= 0)
         cerr << "Working: " << page_count << "/" << page_count;
-    cerr << endl;
+    if (!param.quiet)
+        cerr << endl;
 
     ////////////////////////
     // Process Outline
@@ -167,7 +170,8 @@ void HTMLRenderer::process(PDFDoc *doc)
     bg_renderer = nullptr;
     fallback_bg_renderer = nullptr;
 
-    cerr << endl;
+    if (!param.quiet)
+       cerr << endl;
 }
 
 void HTMLRenderer::setDefaultCTM(double *ctm)
@@ -394,14 +398,21 @@ void HTMLRenderer::post_process(void)
     f_css.fs.close();
 
     // build the main HTML file
-    ofstream output;
-    {
+    std::ofstream foutput;
+    std::streambuf *output_buf;
+    if(param.output_filename == "-") {
+        output_buf = std::cout.rdbuf();
+    }
+    else {
         auto fn = str_fmt("%s/%s", param.dest_dir.c_str(), param.output_filename.c_str());
-        output.open((char*)fn, ofstream::binary);
-        if(!output)
+        foutput.open((char*)fn, ofstream::binary);
+        if(!foutput)
             throw string("Cannot open ") + (char*)fn + " for writing";
-        set_stream_flags(output);
+        set_stream_flags(foutput);
+
+        output_buf = foutput.rdbuf();
     }
+    std::ostream output(output_buf);
 
     // apply manifest
     ifstream manifest_fin((char*)str_fmt("%s/%s", param.data_dir.c_str(), MANIFEST_FILENAME.c_str()), ifstream::binary);

src/Param.h

@@ -77,6 +77,7 @@ struct Param
     std::string data_dir;
     std::string poppler_data_dir;
     std::string tmp_dir;
+    int quiet;
     int debug;
     int proof;
 

src/Preprocessor.cc

@@ -45,7 +45,8 @@ void Preprocessor::process(PDFDoc * doc)
     int page_count = (param.last_page - param.first_page + 1);
     for(int i = param.first_page; i <= param.last_page ; ++i) 
     {
-        cerr << "Preprocessing: " << (i-param.first_page) << "/" << page_count << '\r' << flush;
+        if (!param.quiet)
+            cerr << "Preprocessing: " << (i-param.first_page) << "/" << page_count << '\r' << flush;
 
         doc->displayPage(this, i, DEFAULT_DPI, DEFAULT_DPI,
                 0, 
@@ -54,9 +55,10 @@ void Preprocessor::process(PDFDoc * doc)
                 false, // printing
                 nullptr, nullptr, nullptr, nullptr);
     }
-    if(page_count >= 0)
+    if (!param.quiet && page_count >= 0)
         cerr << "Preprocessing: " << page_count << "/" << page_count;
-    cerr << endl;
+    if (!param.quiet)
+        cerr << endl;
 }
 
 void Preprocessor::drawChar(GfxState *state, double x, double y,

src/pdf2htmlEX.cc

@@ -199,6 +199,7 @@ void parse_options (int argc, char **argv)
         .add("tmp-dir", &param.tmp_dir, param.tmp_dir, "specify the location of temporary directory.")
         .add("data-dir", &param.data_dir, param.data_dir, "specify data directory")
         .add("poppler-data-dir", &param.poppler_data_dir, param.poppler_data_dir, "specify poppler data directory")
+        .add("quiet", &param.quiet, 0, "do no print processing info")
         .add("debug", &param.debug, 0, "print debugging information")
         .add("proof", &param.proof, 0, "texts are drawn on both text layer and background for proof.")