enhance: try to auto-detect the author for the detected identifer

crates/config/schema.json

@@ -120,11 +120,12 @@
       }
     },
     "identifier": {
-      "description": "the app's identifier.",
+      "description": "the application identifier in reverse domain name notation (e.g. `com.packager.example`). This string must be unique across applications since it is used in some system configurations. This string must contain only alphanumeric characters (A–Z, a–z, and 0–9), hyphens (-), and periods (.).",
       "type": [
         "string",
         "null"
-      ]
+      ],
+      "pattern": "^[a-zA-Z0-9-\\.]*$"
     },
     "publisher": {
       "description": "The app's publisher. Defaults to the second element in the identifier string. Currently maps to the Manufacturer property of the Windows Installer.",

crates/config/src/lib.rs

@@ -729,7 +729,11 @@ pub struct Config {
     /// the package's authors.
     #[serde(default)]
     pub authors: Vec<String>,
-    /// the app's identifier.
+    /// the application identifier in reverse domain name notation (e.g. `com.packager.example`).
+    /// This string must be unique across applications since it is used in some system configurations.
+    /// This string must contain only alphanumeric characters (A–Z, a–z, and 0–9), hyphens (-),
+    /// and periods (.).
+    #[schemars(regex(pattern = r"^[a-zA-Z0-9-\.]*$"))]
     pub identifier: Option<String>,
     /// The app's publisher. Defaults to the second element in the identifier string.
     /// Currently maps to the Manufacturer property of the Windows Installer.

crates/packager/schema.json

@@ -120,11 +120,12 @@
       }
     },
     "identifier": {
-      "description": "the app's identifier.",
+      "description": "the application identifier in reverse domain name notation (e.g. `com.packager.example`). This string must be unique across applications since it is used in some system configurations. This string must contain only alphanumeric characters (A–Z, a–z, and 0–9), hyphens (-), and periods (.).",
       "type": [
         "string",
         "null"
-      ]
+      ],
+      "pattern": "^[a-zA-Z0-9-\\.]*$"
     },
     "publisher": {
       "description": "The app's publisher. Defaults to the second element in the identifier string. Currently maps to the Manufacturer property of the Windows Installer.",

crates/packager/src/cli/config.rs

@@ -124,9 +124,17 @@ pub fn load_configs_from_cargo_workspace(
                 config.version = package.version.to_string();
             }
             if config.identifier.is_none() {
+                let author = package
+                    .authors
+                    .first()
+                    .map(|a| {
+                        let a = a.replace(['_', ' ', '.'], "-").to_lowercase();
+                        a.strip_suffix("_").map(ToString::to_string).unwrap_or(a)
+                    })
+                    .unwrap_or_else(|| format!("{}-author", package.name));
                 config
                     .identifier
-                    .replace(format!("com.{}.app", package.name));
+                    .replace(format!("com.{}.{}", author, package.name));
             }
             if config.out_dir.as_os_str().is_empty() {
                 config.out_dir = metadata