From e67b65f863586a4c025bcd262e757fc99b9c7725 Mon Sep 17 00:00:00 2001
From: Shakshi3104 <51497924+Shakshi3104@users.noreply.github.com>
Date: Sun, 4 Dec 2022 17:48:14 +0900
Subject: [PATCH 1/3] Add `lang` and `support-lang` options

---
 LiTeX/LiveTextCLI.swift | 40 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 37 insertions(+), 3 deletions(-)

diff --git a/LiTeX/LiveTextCLI.swift b/LiTeX/LiveTextCLI.swift
index cf20b6e..b49a353 100644
--- a/LiTeX/LiveTextCLI.swift
+++ b/LiTeX/LiveTextCLI.swift
@@ -24,16 +24,40 @@ struct Litex: AsyncParsableCommand {
         )
     
     @Argument(help: "An image filepath.")
-    var imageFilepath: String
+    var imageFilepath: String?
     
     @Flag(help: "Use VNRecognizeTextRequest of Vision. This option is only available on macOS 13 and newer.")
     var useVision: Bool = false
+    
+    @Option(help: "Set recognition language. If you want to check supported languages, run `litex --support-lang`. This option is for VNRecognizeTextRequest.")
+    var lang: String = "ja-JP"
+    
+    @Flag(help: "Show supported languages.")
+    var supportLang: Bool = false
 }
 
 
 // MARK: - Text recognition
 extension Litex {
     func run() async throws {
+        if supportLang {
+            // show supported languages by VNRecognizeTextRequest
+            let request = VNRecognizeTextRequest(completionHandler: { request, error in
+            })
+            
+            do {
+                let supportedLanguages = try request.supportedRecognitionLanguages()
+                print(supportedLanguages.joined(separator: "\n"))
+            } catch {
+                print("Unable to perform the request: \(error).")
+            }
+        } else {
+            // recognize
+            try? await recognize()
+        }
+    }
+    
+    func recognize() async throws {
         if #available(macOS 13.0, *) {
             if useVision {
                 // recognize by Vision
@@ -62,12 +86,17 @@ extension Litex {
             return
         }
         
+        guard let imageFilepath = imageFilepath else {
+            print("Error: Missing expected argument '<image-filepath>'")
+            return
+        }
+        
         // convert image filepath string to URL
         let imageURL = URL(filePath: imageFilepath)
         
         // setup ImageAnalyzer
         var configuration = ImageAnalyzer.Configuration([.text])
-        configuration.locales = ["ja-JP", "en-US"]
+        configuration.locales = [lang]
         let analyzer = ImageAnalyzer()
         
         // analyze the image
@@ -98,6 +127,11 @@ extension Litex {
     
     // MARK: - recognize text via VNRecognizeTextRequest (Vision)
     func recognizeTextByVision() {
+        guard let imageFilepath = imageFilepath else {
+            print("Error: Missing expected argument '<image-filepath>'")
+            return
+        }
+        
         // convert image filepath string to URL
         let imageURL = URL(fileURLWithPath: imageFilepath)
         
@@ -129,7 +163,7 @@ extension Litex {
         
         // perform
         do {
-            request.recognitionLanguages = ["ja-JP", "en-US"]
+            request.recognitionLanguages = [lang]
             #if DEBUG
             let supportedLanguages = try request.supportedRecognitionLanguages()
             print("⚙️ Supported Languages: \(supportedLanguages)")

From 6aa4c1324194502a42dad27c74d5d5a7832de74c Mon Sep 17 00:00:00 2001
From: Shakshi3104 <51497924+Shakshi3104@users.noreply.github.com>
Date: Sun, 4 Dec 2022 17:49:15 +0900
Subject: [PATCH 2/3] Update version

---
 LiTeX/LiveTextCLI.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/LiTeX/LiveTextCLI.swift b/LiTeX/LiveTextCLI.swift
index b49a353..1dce0e3 100644
--- a/LiTeX/LiveTextCLI.swift
+++ b/LiTeX/LiveTextCLI.swift
@@ -19,7 +19,7 @@ struct Litex: AsyncParsableCommand {
         discussion: """
         LiTeX allows use Live Text as the command line tool and output results to a text file.
         """,
-        version: "1.1.0",
+        version: "1.2.0",
         shouldDisplay: true
         )
     

From 4d0b4270ebaa061418e2367cfc4c296c192ffa18 Mon Sep 17 00:00:00 2001
From: Shakshi3104 <51497924+Shakshi3104@users.noreply.github.com>
Date: Sun, 4 Dec 2022 17:51:19 +0900
Subject: [PATCH 3/3] Update README

---
 README.md | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 6196e1a..f1f4ebd 100644
--- a/README.md
+++ b/README.md
@@ -16,14 +16,22 @@ On macOS 12, LiTeX uses [VNRecognizeTextRequest of Vision](https://developer.app
 ## Usage
 
 ```sh
-USAGE: litex <image-filepath> [--use-vision]
+OVERVIEW: Command line tool of Live Text
+
+LiTeX allows use Live Text as the command line tool and output results to a text file.
+
+USAGE: litex [<image-filepath>] [--use-vision] [--lang <lang>] [--support-lang]
 
 ARGUMENTS:
   <image-filepath>        An image filepath.
 
 OPTIONS:
   --use-vision            Use VNRecognizeTextRequest of Vision. This option is only
-                          available on macOS 13.
+                          available on macOS 13 and newer.
+  --lang <lang>           Set recognition language. If you want to check supported
+                          languages, run `litex --support-lang`. This option is for
+                          VNRecognizeTextRequest. (default: ja-JP)
+  --support-lang          Show supported languages.
   --version               Show the version.
   -h, --help              Show help information.
 ```