CLI: Warn if user tries to exclude header files.

Filename exclusion (with -i) works only for the source files.
Print a warning if user tries to exclude header file. The warning
instructs user to use --suppress for ignoring warnings from the
header files.

cli/cppcheckexecutor.cpp

@@ -99,6 +99,27 @@ bool CppCheckExecutor::parseFromArgs(CppCheck *cppcheck, int argc, const char* c
 
     if (!filenames.empty())
     {
+        // Remove header files from the list of ignored files.
+        // Also output a warning for the user.
+        // TODO: Remove all unknown files? (use FileLister::acceptFile())
+        bool warned = false;
+        std::vector<std::string> ignored = parser.GetIgnoredPaths();
+        std::vector<std::string>::iterator iterIgnored = ignored.begin();
+        for (int i = (int)ignored.size() - 1; i >= 0; i--)
+        {
+            const std::string extension = Path::getFilenameExtension(ignored[i]);
+            if (extension == ".h" || extension == ".hpp")
+            {
+                ignored.erase(iterIgnored + i);
+                if (!warned)
+                {
+                    std::cout << "cppcheck: filename exclusion does not apply to header (.h and .hpp) files." << std::endl;
+                    std::cout << "cppcheck: Please use --suppress for ignoring results from the header files." << std::endl;
+                    warned = true; // Warn only once
+                }
+            }
+        }
+
         PathMatch matcher(parser.GetIgnoredPaths());
         std::vector<std::string>::iterator iterBegin = filenames.begin();
         for (int i = (int)filenames.size() - 1; i >= 0; i--)

cli/filelister.cpp

@@ -33,11 +33,9 @@ static int tolowerWrapper(int c)
 
 bool FileLister::acceptFile(const std::string &filename)
 {
-    std::string::size_type dotLocation = filename.find_last_of('.');
-    if (dotLocation == std::string::npos)
+    std::string extension = Path::getFilenameExtension(filename);
+    if (extension == "")
         return false;
-
-    std::string extension = filename.substr(dotLocation);
     std::transform(extension.begin(), extension.end(), extension.begin(), tolowerWrapper);
 
     if (extension == ".cpp" ||

lib/path.cpp

@@ -127,3 +127,13 @@ std::string Path::removeQuotationMarks(const std::string &path)
     editPath.erase(std::remove(editPath.begin(), editPath.end(), '\"'), editPath.end());
     return editPath;
 }
+
+std::string Path::getFilenameExtension(const std::string &path)
+{
+    const std::string::size_type dotLocation = path.find_last_of('.');
+    if (dotLocation == std::string::npos)
+        return "";
+
+    const std::string extension = path.substr(dotLocation);
+    return extension;
+}

lib/path.h

@@ -70,6 +70,13 @@ public:
      * @return Cleaned path without quotation marks.
      */
     static std::string removeQuotationMarks(const std::string &path);
+
+    /**
+      * @brief Get an extension of the filename.
+      * @param path Path containing filename.
+      * @return Filename extension (containing the dot, e.g. ".h").
+      */
+    static std::string getFilenameExtension(const std::string &path);
 };
 
 /// @}