[eframe] Make persistence, http and time optional features

Saves on compile times.

egui_web/Cargo.toml

@@ -16,47 +16,54 @@ include = [ "**/*.rs", "Cargo.toml"]
 crate-type = ["cdylib", "rlib"]
 
 [dependencies]
-egui = { version = "0.6.0", path = "../egui", features = ["serde"] }
-epi = { version = "0.6.0", path = "../epi", features = ["serde", "serde_json"] }
+egui = { version = "0.6.0", path = "../egui" }
+epi = { version = "0.6.0", path = "../epi" }
 js-sys = "0.3"
-serde = "1"
-serde_json = "1"
+serde = { version = "1", optional = true }
+serde_json = { version = "1", optional = true }
 wasm-bindgen = "0.2"
 wasm-bindgen-futures = "0.4"
 
+[features]
+default = []
+http = [
+  "epi/http",
+  "web-sys/Headers",
+  "web-sys/Request",
+  "web-sys/RequestInit",
+  "web-sys/RequestMode",
+  "web-sys/Response",
+]
+persistence = ["serde", "serde_json"]
+
 [dependencies.web-sys]
 version = "0.3"
 features = [
-  'Clipboard',
-  'ClipboardEvent',
-  'console',
-  'CssStyleDeclaration',
-  'DataTransfer',
-  'Document',
-  'DomRect',
-  'Element',
-  'Headers',
-  'HtmlCanvasElement',
-  'HtmlElement',
-  'KeyboardEvent',
-  'Location',
-  'MouseEvent',
-  'Navigator',
-  'Performance',
-  'Request',
-  'RequestInit',
-  'RequestMode',
-  'Response',
-  'Storage',
-  'Touch',
-  'TouchEvent',
-  'TouchList',
-  'WebGlBuffer',
-  'WebGlProgram',
-  'WebGlRenderingContext',
-  'WebGlShader',
-  'WebGlTexture',
-  'WebGlUniformLocation',
-  'WheelEvent',
-  'Window',
+  "Clipboard",
+  "ClipboardEvent",
+  "console",
+  "CssStyleDeclaration",
+  "DataTransfer",
+  "Document",
+  "DomRect",
+  "Element",
+  "HtmlCanvasElement",
+  "HtmlElement",
+  "KeyboardEvent",
+  "Location",
+  "MouseEvent",
+  "Navigator",
+  "Performance",
+  "Storage",
+  "Touch",
+  "TouchEvent",
+  "TouchList",
+  "WebGlBuffer",
+  "WebGlProgram",
+  "WebGlRenderingContext",
+  "WebGlShader",
+  "WebGlTexture",
+  "WebGlUniformLocation",
+  "WheelEvent",
+  "Window",
 ]

egui_web/src/backend.rs

@@ -1,7 +1,6 @@
 use crate::*;
 
 pub use egui::{pos2, Color32};
-use http::WebHttp;
 
 // ----------------------------------------------------------------------------
 
@@ -144,7 +143,8 @@ pub struct AppRunner {
     pub(crate) needs_repaint: std::sync::Arc<NeedRepaint>,
     storage: LocalStorage,
     last_save_time: f64,
-    http: Arc<WebHttp>,
+    #[cfg(feature = "http")]
+    http: Arc<http::WebHttp>,
 }
 
 impl AppRunner {
@@ -160,7 +160,8 @@ impl AppRunner {
             needs_repaint: Default::default(),
             storage,
             last_save_time: now_sec(),
-            http: Arc::new(WebHttp {}),
+            #[cfg(feature = "http")]
+            http: Arc::new(http::WebHttp {}),
         })
     }
 
@@ -210,6 +211,7 @@ impl AppRunner {
                 native_pixels_per_point: Some(native_pixels_per_point()),
             },
             tex_allocator: Some(&mut self.web_backend.painter),
+            #[cfg(feature = "http")]
             http: self.http.clone(),
             output: &mut app_output,
             repaint_signal: self.needs_repaint.clone(),

egui_web/src/lib.rs

@@ -9,6 +9,7 @@
 #![warn(clippy::all, rust_2018_idioms)]
 
 pub mod backend;
+#[cfg(feature = "http")]
 pub mod http;
 pub mod webgl;
 
@@ -154,6 +155,7 @@ pub fn local_storage_remove(key: &str) {
     local_storage().map(|storage| storage.remove_item(key));
 }
 
+#[cfg(feature = "persistence")]
 pub fn load_memory(ctx: &egui::Context) {
     if let Some(memory_string) = local_storage_get("egui_memory_json") {
         match serde_json::from_str(&memory_string) {
@@ -167,6 +169,10 @@ pub fn load_memory(ctx: &egui::Context) {
     }
 }
 
+#[cfg(not(feature = "persistence"))]
+pub fn load_memory(_: &egui::Context) {}
+
+#[cfg(feature = "persistence")]
 pub fn save_memory(ctx: &egui::Context) {
     match serde_json::to_string(&*ctx.memory()) {
         Ok(json) => {
@@ -178,6 +184,9 @@ pub fn save_memory(ctx: &egui::Context) {
     }
 }
 
+#[cfg(not(feature = "persistence"))]
+pub fn save_memory(_: &egui::Context) {}
+
 #[derive(Default)]
 pub struct LocalStorage {}