Fixes #310: can now use Go to Declaration on include directive to jump to included file

src/source_clang.cc

@@ -9,6 +9,7 @@
 #include "dialogs.h"
 #include "ctags.h"
 #include "selection_dialog.h"
+#include "filesystem.h"
 
 namespace sigc {
 #ifndef SIGC_FUNCTORS_DEDUCE_RESULT_TYPE_WITH_DECLTYPE
@@ -1022,6 +1023,57 @@ Source::ClangViewRefactor::ClangViewRefactor(const boost::filesystem::path &file
       auto offset=source_location.get_offset();
       return Offset(offset.line-1, offset.index-1, source_location.get_path());
     }
+    else {
+      // If cursor is at an include line, return offset to included file
+      const static std::regex include_regex("^[ \t]*#[ \t]*include[ \t]*[<\"](.+)[>\"][ \t]*$");
+      std::smatch sm;
+      auto line=get_line();
+      if(std::regex_match(line, sm, include_regex)) {
+        struct ClientData {
+          boost::filesystem::path &file_path;
+          std::string found_include;
+          int line_nr;
+          std::string sm_str;
+        };
+        ClientData client_data{this->file_path, std::string(), get_buffer()->get_insert()->get_iter().get_line(), sm[1].str()};
+        
+        // Attempt to find the 100% correct include file first
+        clang_getInclusions(clang_tu->cx_tu, [](CXFile included_file, CXSourceLocation *inclusion_stack, unsigned include_len, CXClientData client_data_) {
+          auto client_data=static_cast<ClientData*>(client_data_);
+          if(client_data->found_include.empty() && include_len>0) {
+            auto source_location=clang::SourceLocation(inclusion_stack[0]);
+            if(static_cast<int>(source_location.get_offset().line)-1==client_data->line_nr &&
+               filesystem::get_normal_path(source_location.get_path())==client_data->file_path)
+              client_data->found_include=clang::to_string(clang_getFileName(included_file));
+          }
+        }, &client_data);
+        
+        if(!client_data.found_include.empty())
+          return Offset(0, 0, client_data.found_include);
+        
+        // Find a matching include file if no include was found previously
+        clang_getInclusions(clang_tu->cx_tu, [](CXFile included_file, CXSourceLocation *inclusion_stack, unsigned include_len, CXClientData client_data_) {
+          auto client_data=static_cast<ClientData*>(client_data_);
+          if(client_data->found_include.empty()) {
+            for(unsigned c=1;c<include_len;++c) {
+              auto source_location=clang::SourceLocation(inclusion_stack[c]);
+              if(static_cast<int>(source_location.get_offset().line)-1<=client_data->line_nr &&
+                 filesystem::get_normal_path(source_location.get_path())==client_data->file_path) {
+                auto included_file_str=clang::to_string(clang_getFileName(included_file));
+                if(included_file_str.size()>=client_data->sm_str.size() &&
+                   included_file_str.compare(included_file_str.size()-client_data->sm_str.size(), client_data->sm_str.size(), client_data->sm_str)==0) {
+                  client_data->found_include=included_file_str;
+                  break;
+                }
+              }
+            }
+          }
+        }, &client_data);
+        
+        if(!client_data.found_include.empty())
+          return Offset(0, 0, client_data.found_include);
+      }
+    }
     Info::get().print("No declaration found");
     return Offset();
   };