demo available

Package.swift

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+// swift-tools-version:5.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "clipboard",
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "clipboard",
+            dependencies: []),
+        .testTarget(
+            name: "clipboardTests",
+            dependencies: ["clipboard"]),
+    ]
+)

README.md

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+# clipboard
+A simple command line tool to Paste PNG into files, much like pbpaste does for text.
+
+## Save clipboard to local
+If clipboard content is PNG, save it userhome directory named "image.png".
+If not, do no thing.
+Only support 10.13+
+
+## Build
+```shell
+$ swift build
+```
+
+## Usage
+```shell
+$ ./clipboard
+```
+
+## TODO
+- [ ] Judge clipboard content
+- [ ] support command line argvs, such as save-dir,  output-name

Sources/clipboard/main.swift

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+//
+//  main.swift
+//  A simple command line tool to Paste PNG into files, much like pbpaste does for text.
+//
+//  Created by PoplarYang on 2020/3/23.
+//  Copyright © 2020 PoplarYang. All rights reserved.
+//
+
+import Foundation
+import AppKit
+
+class SaveManager{
+
+    let pasteboard = NSPasteboard.general
+
+    @available(OSX 10.13, *)
+    func saveToLocal(){
+        // .fileURL
+//        if let data = pasteboard.data(forType: .fileURL){
+//            guard let fileUri = NSString(data: data , encoding: String.Encoding.utf8.rawValue) else{
+//                print("Cilpboard has file, but it can't be converted by system.");
+//                return
+//            }
+//
+//            guard let url = URL(string: fileUri as String) else{
+//                print("Convert URL failed.")
+//                return
+//            }
+//            print("File Type: \(url)")
+//
+//            guard let contentData = try? Data(contentsOf: url) else{
+//                print("Read file failed, maybe not be permiteted.")
+//                return
+//            }
+//            print("Content Count: \(contentData.count)")
+//            process
+//            return
+//        }
+
+        // Image PNG
+        if let data = pasteboard.data(forType: .png){
+            let fileName: String = "image.png"
+//            let pngPath = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent(filePath)
+            let home = FileManager.default.homeDirectoryForCurrentUser
+            let pngPath = home.appendingPathComponent(fileName)
+
+            do {
+                try data.write(to: pngPath, options: .atomic)
+            } catch {
+                print(error)
+            }
+            print("File Path: \(pngPath)")
+            print("File Type: PNG")
+            print("Content Count: \(data.count)")
+
+            return
+        }
+
+        // File Content Type
+//        if let data = pasteboard.data(forType: .fileContents){
+//            print("File Type: Content")
+//            print("Content Count: \(data.count)")
+//            process
+//            return
+//        }
+
+        print("File Type: not png")
+        exit(-1)
+    }
+}
+
+let manager = SaveManager()
+if #available(OSX 10.13, *) {
+    manager.saveToLocal()
+} else {
+    // Fallback on earlier versions
+    print("Only support 10.13+")
+    exit(-1)
+}

Tests/LinuxMain.swift

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+import XCTest
+
+import clipboardTests
+
+var tests = [XCTestCaseEntry]()
+tests += clipboardTests.allTests()
+XCTMain(tests)

Tests/clipboardTests/XCTestManifests.swift

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+import XCTest
+
+#if !canImport(ObjectiveC)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(clipboardTests.allTests),
+    ]
+}
+#endif

Tests/clipboardTests/clipboardTests.swift

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+import XCTest
+import class Foundation.Bundle
+
+final class clipboardTests: XCTestCase {
+    func testExample() throws {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+
+        // Some of the APIs that we use below are available in macOS 10.13 and above.
+        guard #available(macOS 10.13, *) else {
+            return
+        }
+
+        let fooBinary = productsDirectory.appendingPathComponent("clipboard")
+
+        let process = Process()
+        process.executableURL = fooBinary
+
+        let pipe = Pipe()
+        process.standardOutput = pipe
+
+        try process.run()
+        process.waitUntilExit()
+
+        let data = pipe.fileHandleForReading.readDataToEndOfFile()
+        let output = String(data: data, encoding: .utf8)
+
+        XCTAssertEqual(output, "Hello, world!\n")
+    }
+
+    /// Returns path to the built products directory.
+    var productsDirectory: URL {
+      #if os(macOS)
+        for bundle in Bundle.allBundles where bundle.bundlePath.hasSuffix(".xctest") {
+            return bundle.bundleURL.deletingLastPathComponent()
+        }
+        fatalError("couldn't find the products directory")
+      #else
+        return Bundle.main.bundleURL
+      #endif
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

clipboard.xcodeproj/clipboardTests_Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>$(EXECUTABLE_NAME)</string>
+  <key>CFBundleIdentifier</key>
+  <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>$(PRODUCT_NAME)</string>
+  <key>CFBundlePackageType</key>
+  <string>BNDL</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>$(CURRENT_PROJECT_VERSION)</string>
+  <key>NSPrincipalClass</key>
+  <string></string>
+</dict>
+</plist>