Add ParseException.

man/mastorss.1.adoc

@@ -165,6 +165,7 @@ SOCKS proxy support yet, sorry.
 |    3 | File error.
 |    4 | Mastodon API error.
 |    5 | JSON error, most likely the file is wrongly formatted.
+|    6 | Feed parse error. Usually the type of feed could not be detected.
 |    9 | Unknown error.
 |===============================================================================
 

src/document.cpp

@@ -141,6 +141,8 @@ void Document::parse()
         BOOST_LOG_TRIVIAL(debug) << "RSS detected.";
         parse_rss(tree);
     }
+
+    ParseException{"Could not detect type of feed."};
 }
 
 void Document::parse_rss(const pt::ptree &tree)

src/exceptions.cpp

@@ -63,4 +63,13 @@ const char *FileException::what() const noexcept
 {
     return _message.c_str();
 }
+
+ParseException::ParseException(string message)
+    : _message{move(message)}
+{}
+
+const char *ParseException::what() const noexcept
+{
+    return _message.c_str();
+}
 } // namespace mastorss

src/exceptions.hpp

@@ -68,6 +68,18 @@ public:
     [[nodiscard]]
     const char *what() const noexcept override;
 
+private:
+    const string _message;
+};
+
+class ParseException : public exception
+{
+public:
+    explicit ParseException(string message);
+
+    [[nodiscard]]
+    const char *what() const noexcept override;
+
 private:
     const string _message;
 };

src/main.cpp

@@ -28,6 +28,7 @@ constexpr int network = 2;
 constexpr int file = 3;
 constexpr int mastodon = 4;
 constexpr int json = 5;
+constexpr int parse = 6;
 constexpr int unknown = 9;
 } // namespace error
 
@@ -142,6 +143,11 @@ int main(int argc, char *argv[])
                 cerr << "JSON error:\n" << e.what() << '\n';
                 return error::json;
             }
+            catch (const ParseException &e)
+            {
+                cerr << e.what() << '\n';
+                return error::parse;
+            }
             catch (const runtime_error &e)
             {
                 cerr << e.what() << '\n';