csgprep --ignore-parser-warnings: parser warnings do not affect exit code

The `--quiet` option controls printing of error/warning messages whereas
`--ignore-parser-warnings` controls whether the exit code is affected by
the parsers or not.

Closes: #122

Author: kdudka

Diff for: src/csgrep.cc

@@ -562,6 +562,7 @@ int main(int argc, char *argv[])
             ("prepend-path-prefix", po::value<string>(),        "string prefix to prepend to relative paths (applied after all filters)")
 
             ("ignore-case,i",                                   "ignore case when matching regular expressions")
+            ("ignore-parser-warnings",                          "if enabled, parser warnings about the input files do not affect exit code")
             ("invert-match,v",                                  "select defects that do not match the selected criteria")
             ("invert-regex,n",                                  "invert regular expressions in all predicates")
             ("filter-file,f",       po::value<TStringList>(),   "read custom filtering rules from a file in JSON format");
@@ -664,6 +665,9 @@ int main(int argc, char *argv[])
         // error message already printed, eng already feeed
         return 1;
 
+    if (vm.count("ignore-parser-warnings"))
+        eng->setIgnoreParserWarnings(true);
+
     bool hasError = false;
 
     if (!vm.count("input-file")) {

Diff for: src/lib/writer.cc

@@ -44,7 +44,7 @@ bool AbstractWriter::handleFile(Parser &parser)
         while (parser.getNext(&def))
             this->handleDef(def);
 
-        return !parser.hasError();
+        return ignoreParserWarnings_ || !parser.hasError();
 }
 
 bool AbstractWriter::handleFile(InStream &input)

Diff for: src/lib/writer.hh

@@ -58,10 +58,15 @@ class AbstractWriter {
 
         virtual void setScanProps(const TScanProps &);
 
+        void setIgnoreParserWarnings(const bool val) {
+            ignoreParserWarnings_ = val;
+        }
+
 
     private:
         EFileFormat                 inputFormat_ = FF_INVALID;
         const TScanProps            emptyProps_{};
+        bool                        ignoreParserWarnings_ = false;
 };
 
 using TWriterPtr = std::unique_ptr<AbstractWriter>;