feat(cli.rs): platform-specific conf.json (#2309)

Author: lucasfernog

.changes/platform-specific-config.md

@@ -0,0 +1,5 @@
+---
+"cli.rs": patch
+---
+
+Merge platform-specific `tauri.linux.conf.json`, `tauri.windows.conf.json` and `tauri.macos.conf.json` into the config JSON from `tauri.conf.json`.

docs/api/config.md

@@ -10,7 +10,13 @@ The `tauri.conf.json` is a file generated by the `tauri init` command (see <a hr
 
 Once generated, you may modify it at will to customize your Tauri application.
 
-It's composed of the following properties:
+# Platform-specific configuration
+
+In addition to the JSON defined on the `tauri.conf.json` file, Tauri reads a platform-specific configuration on `tauri.linux.conf.json`, `tauri.windows.conf.json` and `tauri.macos.conf.json` and merges it with the main `tauri.conf.json` configuration.
+
+# Configuration structure
+
+`tauri.conf.json` is composed of the following properties:
 
 ## `build`
 

tooling/cli.rs/src/helpers/config.rs

@@ -84,6 +84,21 @@ fn get_internal(merge_config: Option<&str>, reload: bool) -> crate::Result<Confi
     merge(&mut config, &merge_config);
   }
 
+  let platform_config_filename = if cfg!(target_os = "macos") {
+    "tauri.macos.conf.json"
+  } else if cfg!(windows) {
+    "tauri.windows.conf.json"
+  } else {
+    "tauri.linux.conf.json"
+  };
+  let platform_config_path = super::app_paths::tauri_dir().join(platform_config_filename);
+  if platform_config_path.exists() {
+    let platform_config_file = File::open(platform_config_path)?;
+    let platform_config: JsonValue = serde_json::from_reader(BufReader::new(platform_config_file))
+      .with_context(|| format!("failed to parse `{}`", platform_config_filename))?;
+    merge(&mut config, &platform_config);
+  }
+
   #[allow(unused_mut)]
   let mut config: Config = serde_json::from_value(config)?;
   #[cfg(target_os = "linux")]