cosmic-config-derive: automatically generate setters

cosmic-config-derive/src/lib.rs

@@ -80,6 +80,27 @@ fn impl_cosmic_config_entry_macro(ast: &syn::DeriveInput) -> TokenStream {
         }
     });
 
+    let setters = fields.iter().filter_map(|field| {
+        let field_name = &field.ident.as_ref()?;
+        let field_type = &field.ty;
+        let setter_name = quote::format_ident!("set_{}", field_name);
+        let doc = format!("Sets [`{name}::{field_name}`] and writes to [`cosmic_config::Config`] if changed");
+        Some(quote! {
+            #[doc = #doc]
+            ///
+            /// Returns `Ok(true)` when the field's value has changed and was written to disk
+            pub fn #setter_name(&mut self, config: &cosmic_config::Config, value: #field_type) -> Result<bool, cosmic_config::Error> {
+                if self.#field_name != value {
+                    self.#field_name = value;
+                    cosmic_config::ConfigSet::set(config, stringify!(#field_name), &self.#field_name)?;
+                    Ok(true)
+                } else {
+                    Ok(false)
+                }
+            }
+        })
+    });
+
     let gen = quote! {
         impl CosmicConfigEntry for #name {
             const VERSION: u64 = #version;
@@ -115,6 +136,10 @@ fn impl_cosmic_config_entry_macro(ast: &syn::DeriveInput) -> TokenStream {
                 (errors, keys)
             }
         }
+
+        impl #name {
+            #(#setters)*
+        }
     };
 
     gen.into()

cosmic-theme/src/model/mode.rs

@@ -35,11 +35,6 @@ impl ThemeMode {
         1
     }
 
-    /// Set auto-switch from light to dark mode
-    pub fn set_auto_switch(config: &Config, value: bool) -> Result<(), cosmic_config::Error> {
-        config.set("auto_switch", value)
-    }
-
     /// Get the config for the theme mode
     pub fn config() -> Result<Config, cosmic_config::Error> {
         Config::new(THEME_MODE_ID, Self::version())