feat: Added DiscordConfig for future usage

- Added crate::error::Error::IsNotImplemented
- Added Config::full_impl_path
- Added Config::discord_impl for discord crate

src/config/mod.rs

@@ -357,4 +357,19 @@ impl Config {
         path.push(self.map.clone());
         path
     }
+    
+    /// Returns full path to implementation config TOML, if defined
+    /// This path will be relative to working directory
+    /// Only makes sense if using inside binary crate,
+    /// which provides implementation config
+    pub fn full_impl_path(&self) -> Option<PathBuf> {
+        match &self.impl_path {
+            Some(impl_path) => {
+                let mut path = self.path.clone();
+                path.push(impl_path.clone());
+                Some(path)
+            },
+            None => None,
+        }
+    }
 }

src/error.rs

@@ -15,6 +15,8 @@ pub enum Error {
     TomlSerializeError(toml::ser::Error),
     /// toml::de::Error happened when loading
     TomlDeserializeError(toml::de::Error),
+    /// Implementation config is None, so crate binary is not implemented.
+    IsNotImplemented,
 }
 
 impl fmt::Display for Error {
@@ -24,6 +26,7 @@ impl fmt::Display for Error {
             Self::IoError(error) => write!(f, "{error}"),
             Self::TomlSerializeError(error) => write!(f, "{error}"),
             Self::TomlDeserializeError(error) => write!(f, "{error}"),
+            Self::IsNotImplemented => write!(f, "implementation not found"),
         }
     }
 }