+std::pair<bool, textclass_type> const
+LyXTextClassList::addTextClass(std::string const & textclass, std::string const & path)
+{
+ // only check for textclass.layout file, .cls can be anywhere in $TEXINPUTS
+ // NOTE: latex class name is defined in textclass.layout, which can be different from textclass
+ FileName const layout_file(path + '/' + textclass + ".layout");
+ if (fs::exists(layout_file.toFilesystemEncoding())) {
+ lyxerr[Debug::TCLASS] << "Adding class " << textclass << " from directory " << path << endl;
+ // Read .layout file and get description, real latex classname etc
+ //
+ // This is a C++ version of function processLayoutFile in configure.py,
+ // which uses the following regex
+ // \Declare(LaTeX|DocBook)Class\s*(\[([^,]*)(,.*)*\])*\s*{(.*)}
+ ifstream ifs(layout_file.toFilesystemEncoding().c_str());
+ static regex const reg("^#\\s*\\\\Declare(LaTeX|DocBook)Class\\s*"
+ "(?:\\[([^,]*)(?:,.*)*\\])*\\s*\\{(.*)\\}\\s*");
+ string line;
+ while (getline(ifs, line)) {
+ // look for the \DeclareXXXClass line
+ smatch sub;
+ if (regex_match(line, sub, reg)) {
+ // returns: whole string, classtype (not used here), first option, description
+ BOOST_ASSERT(sub.size()==4);
+ // now, add the layout to textclass.
+ LyXTextClass tmpl(textclass, sub.str(2)==""?textclass:sub.str(2),
+ sub.str(3) + " <" + path + ">", true);
+ if (lyxerr.debugging(Debug::TCLASS))
+ tmpl.load(path);
+ classlist_.push_back(tmpl);
+ return make_pair(true, classlist_.size() - 1);
+ }
+ }
+ }
+ // If .layout is not in local directory, or an invalid layout is found, return false
+ return make_pair(false, textclass_type(0));
+}
+
+