From 528048aa8c1d46152c3d2dd6172d7c26ffdad969 Mon Sep 17 00:00:00 2001
From: Fabian Canas <fcanas@gmail.com>
Date: Fri, 28 Jan 2022 22:16:33 -0500
Subject: [PATCH] Use SwiftArgumentParser

---
 Package.resolved          |   9 +++
 Package.swift             |   9 ++-
 Sources/scrape/main.swift | 120 +++++++++++++++-----------------------
 3 files changed, 63 insertions(+), 75 deletions(-)

diff --git a/Package.resolved b/Package.resolved
index 4c0c779..4c6e568 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -27,6 +27,15 @@
           "revision": "2835209970afdaaaf137fd7073d9c0ab2beb2905",
           "version": "0.2.1"
         }
+      },
+      {
+        "package": "swift-argument-parser",
+        "repositoryURL": "https://github.com/apple/swift-argument-parser",
+        "state": {
+          "branch": null,
+          "revision": "83b23d940471b313427da226196661856f6ba3e0",
+          "version": "0.4.4"
+        }
       }
     ]
   },
diff --git a/Package.swift b/Package.swift
index 158c566..1c3f96e 100644
--- a/Package.swift
+++ b/Package.swift
@@ -17,10 +17,15 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/fcanas/HLSCore.git", from: "0.2.1"),
-        .package(url: "https://github.com/fcanas/FFCLog.git", from:"0.1.0")
+        .package(url: "https://github.com/fcanas/FFCLog.git", from:"0.1.0"),
+        .package(url: "https://github.com/apple/swift-argument-parser", .upToNextMinor(from: "0.4.3")),
     ],
     targets: [
-        .executableTarget(name: "scrape", dependencies: ["scrapeLib", "FFCLog"]),
+        .executableTarget(name: "scrape", dependencies: [
+            "scrapeLib",
+            "FFCLog",
+            .product(name: "ArgumentParser", package: "swift-argument-parser")
+        ]),
         .target(name: "scrapeLib", dependencies: ["HLSCore", "FFCLog"]),
         .testTarget(name: "scrapeTests", dependencies: ["scrapeLib"])
     ]
diff --git a/Sources/scrape/main.swift b/Sources/scrape/main.swift
index b67eb37..5ac8111 100644
--- a/Sources/scrape/main.swift
+++ b/Sources/scrape/main.swift
@@ -6,89 +6,63 @@
 //  Copyright © 2016 Fabian Canas. All rights reserved.
 //
 
+import ArgumentParser
 import Foundation
 import scrapeLib
 import FFCLog
 
-/// Argument Parsing
+extension String: Error {}
 
-let processInfo = ProcessInfo()
-
-var args: [String] = Array(processInfo.arguments[1..<processInfo.arguments.count])
-
-enum Option: String, CaseIterable {
-    case playlistOnly = "-p"
-    case verbose = "-v"
-    case help = "-h"
-}
-
-extension Option {
-    var usageDescription: String {
-        switch self {
-        case .playlistOnly:
-            return "download only playlist files"
-        case .verbose:
-            return "verbose output"
-        case .help:
-            return "show this help"
+struct Scrape: ParsableCommand {
+    
+    @Argument
+    var sourceURL: String
+    
+    @Argument(help: "A destination directory that will be the root of the downloaded HLS directory structure and files.")
+    var destinationDirectory: String
+    
+    @Flag(name:.shortAndLong, help: "Downloads only playlist files, no media files.")
+    var playlistOnly: Bool = false
+    
+    @Flag(name:.shortAndLong, help: "Prints verbose diagnostic output to the console.")
+    var verbose: Bool = false
+    
+    func run() throws {
+        
+        guard
+            let sourceURL = URL(localOrRemoteString: sourceURL)
+        else {
+            throw "Source URL"
         }
-    }
-}
-
-func printUsage() {
-    print("usage: scrape \(Option.allCases.reduce("", { $0 + "[\($1.rawValue)] " }))input_url output_url")
-    print("  input_url     a remote URL to an m3u8 HLS playlist")
-    print("  output_url    a local path where the HLS stream should be saved")
-    Option.allCases.forEach { (opt) in
-        print("  \(opt.rawValue)            \(opt.usageDescription)")
-    }
-}
-
-guard args.count >= 2 else {
-    print("At least 2 arguments needed.")
-    printUsage()
-    exit(EXIT_FAILURE)
-}
+        
+        guard
+            let destinationURL = URL(localOrRemoteString: destinationDirectory)
+        else {
+            throw "Source URL appears invalid"
+        }
+        
+        let urlFilter: ((URL) -> Bool)?
+        
+        if playlistOnly {
+            urlFilter = { url in
+                url.fileExtension.hasPrefix("m3u")
+            }
+        } else {
+            urlFilter = nil
+        }
+        
+        let logLevel: Level = verbose ? .all : .error
 
-guard let destinationURL = URL(localOrRemoteString: args.popLast()!) else {
-    print("Destination path appears invalid")
-    printUsage()
-    exit(EXIT_FAILURE)
-}
 
-guard let sourceURL = URL(localOrRemoteString: args.popLast()!) else {
-    print("Source URL appears invalid")
-    printUsage()
-    exit(EXIT_FAILURE)
-}
+        let downloader = Downloader(destination: destinationURL,
+                                    ingestFunction: HLS.ingestResource,
+                                    logger: FFCLog(thresholdLevel: logLevel))
+        urlFilter.map { downloader.urlFilter = $0 }
 
-var urlFilter: ((URL) -> Bool)?
-var logLevel: Level = .error
+        downloader.downloadResource(sourceURL)
 
-while let arg = args.popLast() {
-    guard let option = Option(rawValue: arg) else {
-        print("Unrecognized option: \(arg)")
-        printUsage()
-        exit(EXIT_FAILURE)
-    }
-    switch option {
-    case .playlistOnly:
-        urlFilter = { url in
-            url.fileExtension.hasPrefix("m3u")
-        }
-    case .verbose:
-        logLevel = .all
-    case .help:
-        printUsage()
-        exit(EXIT_SUCCESS)
+        downloader.group.wait()
     }
 }
 
-let downloader = Downloader(destination: destinationURL,
-                            ingestFunction: HLS.ingestResource,
-                            logger: FFCLog(thresholdLevel: logLevel))
-urlFilter.map { downloader.urlFilter = $0 }
-
-downloader.downloadResource(sourceURL)
-
-downloader.group.wait()
+Scrape.main()