You can press a button and a thing happens!

Persephone.xcodeproj/project.pbxproj

@@ -15,6 +15,7 @@
 		E407863A2110CE70006887B1 /* PersephoneUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = E40786392110CE70006887B1 /* PersephoneUITests.swift */; };
 		E41B22C021FB6BBA00D544F6 /* libmpdclient.2.dylib in Frameworks */ = {isa = PBXBuildFile; fileRef = E41B22BF21FB6BBA00D544F6 /* libmpdclient.2.dylib */; settings = {ATTRIBUTES = (Required, ); }; };
 		E41B22C121FB6C3300D544F6 /* libmpdclient.2.dylib in Embed Libraries */ = {isa = PBXBuildFile; fileRef = E41B22BF21FB6BBA00D544F6 /* libmpdclient.2.dylib */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
+		E41B22C621FB932700D544F6 /* MPDClient.swift in Sources */ = {isa = PBXBuildFile; fileRef = E41B22C521FB932700D544F6 /* MPDClient.swift */; };
 		E465049A21E94DF500A70F4C /* WindowController.swift in Sources */ = {isa = PBXBuildFile; fileRef = E465049921E94DF500A70F4C /* WindowController.swift */; };
 /* End PBXBuildFile section */
 
@@ -65,6 +66,42 @@
 		E407863B2110CE70006887B1 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		E41B22BF21FB6BBA00D544F6 /* libmpdclient.2.dylib */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.dylib"; name = libmpdclient.2.dylib; path = libmpdclient/output/libmpdclient.2.dylib; sourceTree = "<group>"; };
 		E41B22C421FB715A00D544F6 /* module.modulemap */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.module-map"; path = module.modulemap; sourceTree = "<group>"; };
+		E41B22C521FB932700D544F6 /* MPDClient.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MPDClient.swift; sourceTree = "<group>"; };
+		E41B22C921FB966C00D544F6 /* connection.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = connection.h; sourceTree = "<group>"; };
+		E41B22CA21FB966C00D544F6 /* protocol.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = protocol.h; sourceTree = "<group>"; };
+		E41B22CB21FB966C00D544F6 /* error.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = error.h; sourceTree = "<group>"; };
+		E41B22CC21FB966C00D544F6 /* recv.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = recv.h; sourceTree = "<group>"; };
+		E41B22CD21FB966C00D544F6 /* client.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = client.h; sourceTree = "<group>"; };
+		E41B22CE21FB966C00D544F6 /* song.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = song.h; sourceTree = "<group>"; };
+		E41B22CF21FB966C00D544F6 /* response.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = response.h; sourceTree = "<group>"; };
+		E41B22D021FB966C00D544F6 /* status.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = status.h; sourceTree = "<group>"; };
+		E41B22D121FB966C00D544F6 /* tag.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = tag.h; sourceTree = "<group>"; };
+		E41B22D221FB966C00D544F6 /* compiler.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = compiler.h; sourceTree = "<group>"; };
+		E41B22D321FB966C00D544F6 /* settings.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = settings.h; sourceTree = "<group>"; };
+		E41B22D421FB966C00D544F6 /* version.h.in */ = {isa = PBXFileReference; lastKnownFileType = text; path = version.h.in; sourceTree = "<group>"; };
+		E41B22D521FB966C00D544F6 /* parser.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = parser.h; sourceTree = "<group>"; };
+		E41B22D621FB966C00D544F6 /* idle.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = idle.h; sourceTree = "<group>"; };
+		E41B22D721FB966C00D544F6 /* message.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = message.h; sourceTree = "<group>"; };
+		E41B22D821FB966C00D544F6 /* player.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = player.h; sourceTree = "<group>"; };
+		E41B22D921FB966C00D544F6 /* output.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = output.h; sourceTree = "<group>"; };
+		E41B22DA21FB966C00D544F6 /* mixer.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = mixer.h; sourceTree = "<group>"; };
+		E41B22DB21FB966C00D544F6 /* list.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = list.h; sourceTree = "<group>"; };
+		E41B22DC21FB966C00D544F6 /* async.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = async.h; sourceTree = "<group>"; };
+		E41B22DD21FB966C00D544F6 /* directory.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = directory.h; sourceTree = "<group>"; };
+		E41B22DE21FB966C00D544F6 /* database.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = database.h; sourceTree = "<group>"; };
+		E41B22DF21FB966C00D544F6 /* entity.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = entity.h; sourceTree = "<group>"; };
+		E41B22E021FB966C00D544F6 /* pair.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = pair.h; sourceTree = "<group>"; };
+		E41B22E121FB966C00D544F6 /* send.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = send.h; sourceTree = "<group>"; };
+		E41B22E221FB966C00D544F6 /* password.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = password.h; sourceTree = "<group>"; };
+		E41B22E321FB966C00D544F6 /* audio_format.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = audio_format.h; sourceTree = "<group>"; };
+		E41B22E421FB966C00D544F6 /* mount.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = mount.h; sourceTree = "<group>"; };
+		E41B22E521FB966C00D544F6 /* sticker.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = sticker.h; sourceTree = "<group>"; };
+		E41B22E621FB966C00D544F6 /* search.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = search.h; sourceTree = "<group>"; };
+		E41B22E721FB966C00D544F6 /* socket.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = socket.h; sourceTree = "<group>"; };
+		E41B22E821FB966C00D544F6 /* stats.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = stats.h; sourceTree = "<group>"; };
+		E41B22E921FB966C00D544F6 /* capabilities.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = capabilities.h; sourceTree = "<group>"; };
+		E41B22EA21FB966C00D544F6 /* queue.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = queue.h; sourceTree = "<group>"; };
+		E41B22EB21FB966C00D544F6 /* playlist.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = playlist.h; sourceTree = "<group>"; };
 		E465049921E94DF500A70F4C /* WindowController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WindowController.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
@@ -118,6 +155,7 @@
 		E407861A2110CE6E006887B1 /* Persephone */ = {
 			isa = PBXGroup;
 			children = (
+				E41B22C721FB966C00D544F6 /* include */,
 				E407861B2110CE6E006887B1 /* AppDelegate.swift */,
 				E407861D2110CE6E006887B1 /* ViewController.swift */,
 				E407861F2110CE70006887B1 /* Assets.xcassets */,
@@ -125,7 +163,7 @@
 				E465049921E94DF500A70F4C /* WindowController.swift */,
 				E40786242110CE70006887B1 /* Info.plist */,
 				E40786252110CE70006887B1 /* Persephone.entitlements */,
-				E41B22C421FB715A00D544F6 /* module.modulemap */,
+				E41B22C521FB932700D544F6 /* MPDClient.swift */,
 			);
 			path = Persephone;
 			sourceTree = "<group>";
@@ -156,6 +194,57 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		E41B22C721FB966C00D544F6 /* include */ = {
+			isa = PBXGroup;
+			children = (
+				E41B22C421FB715A00D544F6 /* module.modulemap */,
+				E41B22C821FB966C00D544F6 /* mpd */,
+			);
+			path = include;
+			sourceTree = "<group>";
+		};
+		E41B22C821FB966C00D544F6 /* mpd */ = {
+			isa = PBXGroup;
+			children = (
+				E41B22DC21FB966C00D544F6 /* async.h */,
+				E41B22E321FB966C00D544F6 /* audio_format.h */,
+				E41B22E921FB966C00D544F6 /* capabilities.h */,
+				E41B22CD21FB966C00D544F6 /* client.h */,
+				E41B22D221FB966C00D544F6 /* compiler.h */,
+				E41B22C921FB966C00D544F6 /* connection.h */,
+				E41B22DE21FB966C00D544F6 /* database.h */,
+				E41B22DD21FB966C00D544F6 /* directory.h */,
+				E41B22DF21FB966C00D544F6 /* entity.h */,
+				E41B22CB21FB966C00D544F6 /* error.h */,
+				E41B22D621FB966C00D544F6 /* idle.h */,
+				E41B22DB21FB966C00D544F6 /* list.h */,
+				E41B22D721FB966C00D544F6 /* message.h */,
+				E41B22DA21FB966C00D544F6 /* mixer.h */,
+				E41B22E421FB966C00D544F6 /* mount.h */,
+				E41B22D921FB966C00D544F6 /* output.h */,
+				E41B22E021FB966C00D544F6 /* pair.h */,
+				E41B22D521FB966C00D544F6 /* parser.h */,
+				E41B22E221FB966C00D544F6 /* password.h */,
+				E41B22D821FB966C00D544F6 /* player.h */,
+				E41B22EB21FB966C00D544F6 /* playlist.h */,
+				E41B22CA21FB966C00D544F6 /* protocol.h */,
+				E41B22EA21FB966C00D544F6 /* queue.h */,
+				E41B22CC21FB966C00D544F6 /* recv.h */,
+				E41B22CF21FB966C00D544F6 /* response.h */,
+				E41B22E621FB966C00D544F6 /* search.h */,
+				E41B22E121FB966C00D544F6 /* send.h */,
+				E41B22D321FB966C00D544F6 /* settings.h */,
+				E41B22E721FB966C00D544F6 /* socket.h */,
+				E41B22CE21FB966C00D544F6 /* song.h */,
+				E41B22E821FB966C00D544F6 /* stats.h */,
+				E41B22D021FB966C00D544F6 /* status.h */,
+				E41B22E521FB966C00D544F6 /* sticker.h */,
+				E41B22D121FB966C00D544F6 /* tag.h */,
+				E41B22D421FB966C00D544F6 /* version.h.in */,
+			);
+			path = mpd;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -225,6 +314,11 @@
 				TargetAttributes = {
 					E40786172110CE6E006887B1 = {
 						CreatedOnToolsVersion = 9.4.1;
+						SystemCapabilities = {
+							com.apple.Sandbox = {
+								enabled = 0;
+							};
+						};
 					};
 					E40786292110CE70006887B1 = {
 						CreatedOnToolsVersion = 9.4.1;
@@ -289,6 +383,7 @@
 			files = (
 				E407861E2110CE6E006887B1 /* ViewController.swift in Sources */,
 				E465049A21E94DF500A70F4C /* WindowController.swift in Sources */,
+				E41B22C621FB932700D544F6 /* MPDClient.swift in Sources */,
 				E407861C2110CE6E006887B1 /* AppDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -471,10 +566,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_VERSION = 4.0;
-				SYSTEM_HEADER_SEARCH_PATHS = (
+				SYSTEM_HEADER_SEARCH_PATHS = Persephone/include;
-					libmpdclient/include,
-					Persephone,
-				);
 				USER_HEADER_SEARCH_PATHS = libmpdclient/output;
 			};
 			name = Debug;
@@ -501,10 +593,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_VERSION = 4.0;
-				SYSTEM_HEADER_SEARCH_PATHS = (
+				SYSTEM_HEADER_SEARCH_PATHS = Persephone/include;
-					libmpdclient/include,
-					Persephone,
-				);
 				USER_HEADER_SEARCH_PATHS = libmpdclient/output;
 			};
 			name = Release;

Persephone/Base.lproj/Main.storyboard

@@ -693,7 +693,6 @@
                         <toolbar key="toolbar" implicitIdentifier="33DCB92B-74AF-496A-99FE-1F88002CB88A" autosavesConfiguration="NO" displayMode="iconOnly" sizeMode="regular" id="eNB-TI-KUS">
                             <allowedToolbarItems>
                                 <toolbarItem implicitItemIdentifier="NSToolbarSpaceItem" id="mhg-16-CNM"/>
-                                <toolbarItem implicitItemIdentifier="NSToolbarFlexibleSpaceItem" id="NWn-Bn-Qn8"/>
                                 <toolbarItem implicitItemIdentifier="2D01DD0F-DDD1-411E-9270-20E2B5B07FC2" label="Controls" paletteLabel="Controls" sizingBehavior="auto" id="p3r-ty-Pxf">
                                     <nil key="toolTip"/>
                                     <segmentedControl key="view" verticalHuggingPriority="750" id="Bbf-C6-1Gu">
@@ -705,13 +704,15 @@
                                                 <segment image="prevTrackButton" width="32"/>
                                                 <segment image="playButton" width="48" tag="1"/>
                                                 <segment image="stopButton" width="32"/>
-                                                <segment image="nextTrackButton" width="32">
+                                                <segment image="nextTrackButton" width="32"/>
-                                                    <nil key="label"/>
-                                                </segment>
                                             </segments>
+                                            <connections>
+                                                <action selector="handleTransportControl:" target="B8D-0N-5wS" id="HTN-5E-y75"/>
+                                            </connections>
                                         </segmentedCell>
                                     </segmentedControl>
                                 </toolbarItem>
+                                <toolbarItem implicitItemIdentifier="NSToolbarFlexibleSpaceItem" id="9ol-aR-mzv"/>
                             </allowedToolbarItems>
                             <defaultToolbarItems>
                                 <toolbarItem reference="p3r-ty-Pxf"/>
@@ -762,13 +763,13 @@
                         <rect key="frame" x="0.0" y="0.0" width="450" height="300"/>
                         <autoresizingMask key="autoresizingMask"/>
                         <subviews>
-                            <scrollView borderType="none" autohidesScrollers="YES" horizontalLineScroll="26" horizontalPageScroll="10" verticalLineScroll="26" verticalPageScroll="10" usesPredominantAxisScrolling="NO" translatesAutoresizingMaskIntoConstraints="NO" id="S3o-nF-NN7">
+                            <scrollView borderType="none" autohidesScrollers="YES" horizontalLineScroll="19" horizontalPageScroll="10" verticalLineScroll="19" verticalPageScroll="10" usesPredominantAxisScrolling="NO" translatesAutoresizingMaskIntoConstraints="NO" id="S3o-nF-NN7">
                                 <rect key="frame" x="0.0" y="0.0" width="450" height="300"/>
                                 <clipView key="contentView" drawsBackground="NO" id="WI8-Pw-03L">
                                     <rect key="frame" x="0.0" y="0.0" width="450" height="300"/>
                                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                     <subviews>
-                                        <outlineView verticalHuggingPriority="750" allowsExpansionToolTips="YES" columnAutoresizingStyle="lastColumnOnly" selectionHighlightStyle="sourceList" multipleSelection="NO" autosaveColumns="NO" rowHeight="24" rowSizeStyle="automatic" viewBased="YES" indentationPerLevel="16" outlineTableColumn="0Co-uF-CCB" id="jEJ-jg-fll">
+                                        <outlineView verticalHuggingPriority="750" allowsExpansionToolTips="YES" columnAutoresizingStyle="lastColumnOnly" selectionHighlightStyle="sourceList" multipleSelection="NO" autosaveColumns="NO" rowSizeStyle="automatic" viewBased="YES" indentationPerLevel="16" outlineTableColumn="0Co-uF-CCB" id="jEJ-jg-fll">
                                             <rect key="frame" x="0.0" y="0.0" width="450" height="300"/>
                                             <autoresizingMask key="autoresizingMask"/>
                                             <size key="intercellSpacing" width="3" height="2"/>

Persephone/MPDClient.swift

@@ -0,0 +1,62 @@
+//
+//  MPDClient.swift
+//  Persephone
+//
+//  Created by Daniel Barber on 2019/1/25.
+//  Copyright © 2019 Dan Barber. All rights reserved.
+//
+
+import Foundation
+import mpdclient
+
+class MPDClient {
+  let HOST = "localhost"
+  let PORT: UInt32 = 6600
+  private let connection: OpaquePointer
+  private var status: OpaquePointer?
+
+  init?() {
+    guard let connection = mpd_connection_new(HOST, PORT, 0)
+      else { return nil }
+
+    mpd_connection_set_keepalive(connection, true)
+
+    self.connection = connection
+  }
+
+  deinit {
+    mpd_connection_free(connection)
+  }
+
+  func getStatus() {
+    status = mpd_status_begin()
+  }
+
+  func playPause() {
+    mpd_run_toggle_pause(connection)
+  }
+
+  func stop() {
+    mpd_run_stop(connection)
+  }
+
+  func prevTrack() {
+    mpd_run_previous(connection)
+  }
+
+  func nextTrack() {
+    mpd_run_next(connection)
+  }
+
+  func getLastErrorMessage() -> String! {
+    if mpd_connection_get_error(connection) == MPD_ERROR_SUCCESS {
+      return "no error"
+    }
+
+    if let errorMessage = mpd_connection_get_error_message(connection) {
+      return String(cString: errorMessage)
+    }
+
+    return "no error message"
+  }
+}

Persephone/Persephone.entitlements

@@ -1,10 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
-<dict>
+<dict/>
-    <key>com.apple.security.app-sandbox</key>
-    <true/>
-    <key>com.apple.security.files.user-selected.read-only</key>
-    <true/>
-</dict>
 </plist>

Persephone/ViewController.swift

@@ -7,7 +7,6 @@
 //
 
 import Cocoa
-import mpdclient
 
 class ViewController: NSViewController {
   override func viewDidLoad() {

Persephone/WindowController.swift

@@ -9,8 +9,36 @@
 import Cocoa
 
 class WindowController: NSWindowController {
-    override func windowDidLoad() {
+  enum TransportAction: Int {
-        super.windowDidLoad()
+    case prevTrack = 0
-        window?.titleVisibility = .hidden
+    case playPause = 1
+    case stop = 2
+    case nextTrack = 3
+  }
+  var mpdClient: MPDClient?
+
+  override func windowDidLoad() {
+    super.windowDidLoad()
+    window?.titleVisibility = .hidden
+    mpdClient = MPDClient()
+    mpdClient?.getStatus()
+  }
+
+  @IBAction func handleTransportControl(_ sender: NSSegmentedControl) {
+    guard let transportAction = TransportAction(rawValue: sender.selectedSegment)
+      else { return }
+
+    switch transportAction {
+    case .prevTrack:
+      mpdClient?.prevTrack()
+    case .playPause:
+      mpdClient?.playPause()
+    case .stop:
+      mpdClient?.stop()
+    case .nextTrack:
+      mpdClient?.nextTrack()
+    default:
+      break
     }
+  }
 }

Persephone/include/module.modulemap

@@ -0,0 +1,5 @@
+module mpdclient {
+  umbrella header "mpd/client.h"
+  export *
+  module * { export * }
+}

Persephone/include/mpd

@@ -0,0 +1 @@
+../../libmpdclient/include/mpd

Persephone/module.modulemap

@@ -1,4 +0,0 @@
-module mpdclient [system] {
-  umbrella "mpd"
-  export *
-}