feat(log): Custom .log file names (#633)

* feat (log): custom .log file names

* fix (log): corrected typo

* chore (log): refactor

* chore (log): replaced empty string with Option

* Apply suggestions from code review

* Update plugins/log/src/lib.rs

---------

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>

plugins/log/src/lib.rs

@@ -118,7 +118,7 @@ pub enum LogTarget {
     ///
     /// The plugin will ensure the directory exists before writing logs.
     Folder(PathBuf),
-    /// Write logs to the OS specififc logs directory.
+    /// Write logs to the OS specific logs directory.
     ///
     /// ### Platform-specific
     ///
@@ -167,6 +167,7 @@ pub struct Builder {
     timezone_strategy: TimezoneStrategy,
     max_file_size: u128,
     targets: Vec<LogTarget>,
+    log_name: Option<String>,
 }
 
 impl Default for Builder {
@@ -189,6 +190,7 @@ impl Default for Builder {
             timezone_strategy: DEFAULT_TIMEZONE_STRATEGY,
             max_file_size: DEFAULT_MAX_FILE_SIZE,
             targets: DEFAULT_LOG_TARGETS.into(),
+            log_name: None,
         }
     }
 }
@@ -262,6 +264,29 @@ impl Builder {
         self
     }
 
+    /// Writes logs to the given file. Default: <app_name>.log)
+    ///
+    /// Note: This does not modify the directory logs go into. For that refer to `LogTarget::Folder`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use tauri_plugin_log::Builder;
+    /// let name = "custom-name";
+    /// let builder = Builder::default()
+    ///     .targets([
+    ///         LogTarget::LogDir
+    ///     ])
+    ///     .log_name(name)
+    ///     .build()
+    /// ); // Outputs content to custom-name.log
+    ///
+    /// ```
+    pub fn log_name<S: Into<String>>(mut self, log_name: S) -> Self {
+        self.log_name = Some(log_name.into());
+        self
+    }
+
     #[cfg(feature = "colored")]
     pub fn with_colors(self, colors: fern::colors::ColoredLevelConfig) -> Self {
         let format =
@@ -284,7 +309,10 @@ impl Builder {
         plugin::Builder::new("log")
             .invoke_handler(tauri::generate_handler![log])
             .setup(move |app_handle| {
-                let app_name = &app_handle.package_info().name;
+                let log_name = self
+                    .log_name
+                    .as_deref()
+                    .unwrap_or_else(|| &app_handle.package_info().name);
 
                 // setup targets
                 for target in &self.targets {
@@ -298,7 +326,7 @@ impl Builder {
 
                             fern::log_file(get_log_file_path(
                                 &path,
-                                app_name,
+                                log_name,
                                 &self.rotation_strategy,
                                 &self.timezone_strategy,
                                 self.max_file_size,
@@ -313,7 +341,7 @@ impl Builder {
 
                             fern::log_file(get_log_file_path(
                                 &path,
-                                app_name,
+                                log_name,
                                 &self.rotation_strategy,
                                 &self.timezone_strategy,
                                 self.max_file_size,
@@ -347,12 +375,12 @@ impl Builder {
 
 fn get_log_file_path(
     dir: &impl AsRef<Path>,
-    app_name: &str,
+    log_name: &str,
     rotation_strategy: &RotationStrategy,
     timezone_strategy: &TimezoneStrategy,
     max_file_size: u128,
 ) -> plugin::Result<PathBuf> {
-    let path = dir.as_ref().join(format!("{app_name}.log"));
+    let path = dir.as_ref().join(format!("{log_name}.log"));
 
     if path.exists() {
         let log_size = File::open(&path)?.metadata()?.len() as u128;
@@ -361,7 +389,7 @@ fn get_log_file_path(
                 RotationStrategy::KeepAll => {
                     let to = dir.as_ref().join(format!(
                         "{}_{}.log",
-                        app_name,
+                        log_name,
                         timezone_strategy
                             .get_now()
                             .format(