Enhance merge command with auto format detection

Expanded the documentation for the merge command to clarify automatic format detection, language grouping, conflict resolution strategies, and output format conversion. Updated argument descriptions to reflect support for multiple file formats and improved usability.

Author: WendellXY

langcodec-cli/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "langcodec-cli"
-version = "0.3.4"
+version = "0.3.5"
 edition = "2024"
 description = "A universal CLI tool for converting and inspecting localization files (Apple, Android, CSV, etc.)"
 license = "MIT"

langcodec-cli/src/main.rs

@@ -69,15 +69,26 @@ enum Commands {
         full: bool,
     },
 
-    /// Merge multiple localization files of the same format into one output file.
+    /// Merge multiple localization files into one output file with automatic format detection and conversion.
+    ///
+    /// This command intelligently merges multiple localization files, automatically detecting
+    /// input formats and converting to the output format based on the file extension.
+    /// Supports merging files with the same language and provides conflict resolution strategies.
+    ///
+    /// Features:
+    /// - Automatic format detection from file extensions (.strings, .xml, .csv, .tsv, .xcstrings)
+    /// - Smart language grouping and merging
+    /// - Multiple conflict resolution strategies (first, last, skip)
+    /// - Language override for all input files
+    /// - Automatic output format conversion
     Merge {
-        /// The input files to merge
+        /// The input files to merge (supports multiple formats: .strings, .xml, .csv, .tsv, .xcstrings, .json, .yaml)
         #[arg(short, long, num_args = 1..)]
         inputs: Vec<String>,
-        /// The output file to write the merged results to
+        /// The output file path (format automatically determined from extension)
         #[arg(short, long)]
         output: String,
-        /// Strategy for handling conflicts
+        /// Strategy for handling conflicts when merging entries with the same key
         #[arg(short, long, default_value = "last")]
         strategy: ConflictStrategy,
         /// Language code to use for all input files (e.g., "en", "fr")