Add doc warning about the crate feature

Cargo.toml

@@ -32,3 +32,7 @@ default = ["tls"]
 tls = ["native-tls"]
 debug = []
 toml_support = ["toml", "serde", "serde_derive"]
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]

src/lib.rs

@@ -22,17 +22,21 @@
 
 #![warn(missing_docs)]
 #![allow(clippy::too_many_lines)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 
 #[cfg(feature = "tls")]
 use native_tls::TlsConnector;
 
 use std::borrow::Cow;
-use std::fs::File;
 use std::io::{Error, Read, Write};
 use std::net::TcpStream;
-use std::path::Path;
 
+#[cfg(feature = "toml_support")]
 use serde_derive::Deserialize;
+#[cfg(feature = "toml_support")]
+use std::fs::File;
+#[cfg(feature = "toml_support")]
+use std::path::Path;
 
 /// IRC comamnds
 pub mod commands;
@@ -47,7 +51,8 @@ pub struct Client {
 }
 
 /// Config for the IRC client
-#[derive(Clone, Deserialize, Default)]
+#[derive(Clone, Default)]
+#[cfg_attr(feature = "toml_support", derive(Deserialize))]
 pub struct Config {
     channels: Vec<String>,
     host: String,
@@ -620,8 +625,6 @@ impl Config {
         }
     }
 
-    /// _This feature requires the `toml_support` feature to be enabled._
-    /// 
     /// Create a config from a toml file
     /// ```toml
     /// channels = ["#main", "#main2"]
@@ -634,6 +637,7 @@ impl Config {
     /// # Errors
     /// Returns an Error if the file cannot be opened or if the TOML is invalid
     ///
+    #[cfg_attr(docsrs, doc(cfg(feature = "toml_support")))]
     #[cfg(feature = "toml_support")]
     pub fn from_toml<P: AsRef<Path>>(path: P) -> Result<Self, Error> {
         let mut file = File::open(&path)?;