Added Xcode support

Author: samdeane

Plugins/SwiftFormatterPlugin/SwiftFormatterPlugin.swift

@@ -17,7 +17,7 @@ struct FormatterPlugin: CommandPlugin {
         var baseArguments: [String] = ["--quiet", "--cache", cacheFile]
 
         let configFile = context.package.directory.appending(".swiftformat").string
-        if !FileManager.default.fileExists(atPath: configFile), let defaultPath = defaultConfigPath(context: context) {
+        if !FileManager.default.fileExists(atPath: configFile), let defaultPath = defaultConfigPath(workDirectory: context.pluginWorkDirectory) {
             baseArguments.append(contentsOf: ["--config", defaultPath])
         }
 
@@ -49,19 +49,22 @@ struct FormatterPlugin: CommandPlugin {
         }
     }
 
-    func defaultConfigPath(context: PluginContext) -> String? {
+    func defaultConfigPath(workDirectory: Path) -> String? {
         let path = ("~/.swiftformat" as NSString).expandingTildeInPath
         if FileManager.default.fileExists(atPath: path) {
             return path
         }
 
-        let defaultPath = context.pluginWorkDirectory.appending("default-swift-format-config").string
+        let defaultPath = workDirectory.appending("default-swift-format-config").string
         let defaultConfig = """
             # Default Elegant Chaos swift-format configuration options.
             # See https://github.com/nicklockwood/SwiftFormat#config-file for more details.
             # To override these, place a .swiftformat file into your source directory, or at ~/.swiftformat.
 
             --ifdef no-indent
+            --indentcase true
+            --self init-only
+            --indentstrings true
             """
 
         do {
@@ -73,3 +76,49 @@ struct FormatterPlugin: CommandPlugin {
         }
     }
 }
+
+#if canImport(XcodeProjectPlugin)
+import XcodeProjectPlugin
+
+extension FormatterPlugin: XcodeCommandPlugin {
+    func performCommand(context: XcodePluginContext, arguments: [String]) throws {
+        let swiftFormatTool = try context.tool(named: "swiftformat")
+        let swiftFormatExec = URL(fileURLWithPath: swiftFormatTool.path.string)
+        
+        let cacheFile = context.pluginWorkDirectory.appending("swift-format-cache").string
+        var baseArguments: [String] = ["--quiet", "--cache", cacheFile]
+        
+        let configFile = context.xcodeProject.directory.appending(".swiftformat").string
+        if !FileManager.default.fileExists(atPath: configFile), let defaultPath = defaultConfigPath(workDirectory: context.pluginWorkDirectory) {
+            baseArguments.append(contentsOf: ["--config", defaultPath])
+        }
+        
+//        let swiftVersionFile = context.xcodeProject.directory.appending(".swift-version").string
+//        if !FileManager.default.fileExists(atPath: swiftVersionFile) {
+//            let tools = context.xcodeProject.
+//            let version = "\(tools.major).\(tools.minor)"
+//            baseArguments.append(contentsOf: ["--swiftversion", version])
+//        }
+        
+        for target in context.xcodeProject.targets {
+            guard let target = target as? SourceModuleTarget else { continue }
+            
+            var arguments = baseArguments
+            arguments.append(target.directory.string)
+            
+            let process = Process()
+            process.executableURL = swiftFormatExec
+            process.arguments = arguments
+            try process.run()
+            process.waitUntilExit()
+            
+            if process.terminationReason == .exit && process.terminationStatus == 0 {
+                Diagnostics.remark("Formatted the source code in \(target.directory).")
+            } else {
+                let problem = "\(process.terminationReason):\(process.terminationStatus)"
+                Diagnostics.error("swift-format invocation failed: \(problem)")
+            }
+        }
+    }
+}
+#endif