Use argument parser

Sources/Generator/main.swift

@@ -1,50 +0,0 @@
-import Foundation
-
-#warning("TODO: Add markdown box command: ![box](title;body)")
-#warning("TODO: Add pretty link to other page in page content: ![page](page_id)")
-#warning("TODO: Improve display of processed image list and warnings")
-
-let args = CommandLine.arguments
-
-guard args.count == 2 else {
-    print("Invalid argument list")
-    print("Usage: generator config-path")
-    exit(1)
-}
-
-let configuration: Configuration
-do {
-    let configUrl = URL(fileURLWithPath: args[1])
-    let data = try Data(contentsOf: configUrl)
-    configuration = try JSONDecoder().decode(from: data)
-} catch {
-    print("Failed to read configuration: \(error)")
-    exit(1)
-}
-
-let log = ValidationLog()
-let files = FileSystem(
-    in: configuration.contentDirectory,
-    to: configuration.outputDirectory)
-
-guard let siteData = Element(atRoot: configuration.contentDirectory) else {
-    exit(0)
-}
-
-do {
-    let siteGenerator = try SiteGenerator()
-    siteGenerator.generate(site: siteData)
-} catch {
-    print("Failed to generate website: \(error)")
-    exit(2)
-}
-
-files.printGeneratedPages()
-files.printEmptyPages()
-files.printDraftPages()
-
-files.createImages()
-print("Images generated")
-files.copyRequiredFiles()
-files.printExternalFiles()
-files.writeHashes()

Sources/Generator/run.swift

@@ -0,0 +1,43 @@
+import Foundation
+import ArgumentParser
+
+var configuration: Configuration!
+let log = ValidationLog()
+var files: FileSystem!
+
+@main
+struct CHGenerator: ParsableCommand {
+
+    @Argument(help: "The path to the generator configuration file")
+    var configPath: String
+
+    mutating func run() throws {
+        try generate(configPath: configPath)
+    }
+}
+
+private func generate(configPath: String) throws {
+    let configUrl = URL(fileURLWithPath: configPath)
+    let data = try Data(contentsOf: configUrl)
+    configuration = try JSONDecoder().decode(from: data)
+
+    files = .init(
+        in: configuration.contentDirectory,
+        to: configuration.outputDirectory)
+
+    guard let siteData = Element(atRoot: configuration.contentDirectory) else {
+        return
+    }
+    let siteGenerator = try SiteGenerator()
+    siteGenerator.generate(site: siteData)
+
+    files.printGeneratedPages()
+    files.printEmptyPages()
+    files.printDraftPages()
+
+    files.createImages()
+    print("Images generated")
+    files.copyRequiredFiles()
+    files.printExternalFiles()
+    files.writeHashes()
+}