Make fltk dependency optional on ui feature

Cargo.toml

@@ -4,22 +4,21 @@ version = "0.2.0"
 edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
-steam_shortcuts_util="1.1.2"
-steamgriddb_api="0.2,0"
-serde={version="1.0.130", features=["derive"]}
+steam_shortcuts_util = "1.1.2"
+steamgriddb_api = "0.2,0"
+serde = { version = "1.0.130", features = ["derive"] }
 serde_json = "1.0.68"
 tokio = { version = "1.11.0", features = ["full"] }
 reqwest = { version = "0.11.4", features = ["default"] }
 config = "0.11.0"
 failure = "0.1.8"
 #https://fltk-rs.github.io/fltk-rs/
-fltk = { version = "^1.2", features = ["fltk-bundled"] }
-
+fltk = { version = "^1.2", features = ["fltk-bundled"], optional = true }
 
 [build-dependencies]
-fl2rust = "0.4"
+fl2rust = { version = "0.4", optional = true }
 
 [features]
-ui=[]
+# default = ["ui"]
+ui = ["fltk", "fl2rust"]

build.rs

@@ -1,9 +1,18 @@
-use std::path::PathBuf;
+#[cfg(feature = "ui")]
 use std::env;
+#[cfg(feature = "ui")]
+use std::path::PathBuf;
 
 fn main() {
+    #[cfg(feature = "ui")]
+    {
         println!("cargo:rerun-if-changed=gui/mainview.fl");
         let g = fl2rust::Generator::default();
         let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
-    g.in_out("gui/mainview.fl", out_path.join("mainview.rs").to_str().unwrap()).expect("Failed to generate rust from fl file!");
+        g.in_out(
+            "gui/mainview.fl",
+            out_path.join("mainview.rs").to_str().unwrap(),
+        )
+        .expect("Failed to generate rust from fl file!");
+    }
 }

src/main.rs

@@ -6,7 +6,9 @@ mod platform;
 mod settings;
 mod steam;
 mod steamgriddb;
+#[cfg(feature = "ui")]
 use fltk::{app, prelude::*, window::Window};
+#[cfg(feature = "ui")]
 mod mainview;
 
 use crate::{
@@ -26,6 +28,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
         let app = app::App::default().with_scheme(app::Scheme::Gtk);
         let mut ui = mainview::UserInterface::make_window();
         
+
         app.run().unwrap();
     }