Add Copy Value command

MongoView/Node.swift

@@ -230,4 +230,13 @@ extension Node {
             return "MaxKey"
         }
     }
+    
+    var isValueCopyable: Bool {
+        switch value {
+        case .document(_), .array(_), .binary(_), .minKey, .maxKey:
+            return false
+        default:
+            return true
+        }
+    }
 }

MongoView/View Controllers/QueryViewController.swift

@@ -138,6 +138,14 @@ class QueryViewController: NSViewController {
         }
     }
     
+    private func nodeForCopying() -> Node? {
+        if outlineView.clickedRow >= 0 {
+            return outlineView.item(atRow: outlineView.clickedRow) as? Node
+        } else {
+            return outlineView.item(atRow: outlineView.selectedRow) as? Node
+        }
+    }
+    
     @objc func outlineCellDoubleClicked() {
         if let item = outlineView.item(atRow: outlineView.clickedRow) {
             if outlineView.isItemExpanded(item) {
@@ -171,6 +179,13 @@ class QueryViewController: NSViewController {
         }
         wc.showWindow(nil)
     }
+    
+    @IBAction func copy(_ sender: Any) {
+        guard let node = nodeForCopying() else { return }
+        NSPasteboard.general.clearContents()
+        NSPasteboard.general.setString(node.valueString, forType: .string)
+        // todo: support copying more specific types?
+    }
 }
 
 extension QueryViewController: NSMenuItemValidation {
@@ -181,6 +196,9 @@ extension QueryViewController: NSMenuItemValidation {
             } else {
                 return false
             }
+        } else if menuItem.action == #selector(copy(_:)) {
+            let node = nodeForCopying()
+            return node != nil && node!.isValueCopyable
         }
         return true
     }

MongoView/View Controllers/QueryViewController.xib

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="16096" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="16097" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="16096"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="16097"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
@@ -1139,18 +1139,25 @@
         </customView>
         <menu id="nL5-kg-dty">
             <items>
-                <menuItem title="Edit Document" id="0gS-XH-YDt">
+                <menuItem title="Edit Document…" id="0gS-XH-YDt">
                     <modifierMask key="keyEquivalentModifierMask"/>
                     <connections>
                         <action selector="editDocument:" target="-2" id="DP4-Tq-o5M"/>
                     </connections>
                 </menuItem>
-                <menuItem title="Delete" id="nn0-ZF-eDZ">
+                <menuItem isSeparatorItem="YES" id="xG5-Uo-1aO"/>
+                <menuItem title="Delete…" id="nn0-ZF-eDZ">
                     <modifierMask key="keyEquivalentModifierMask"/>
                     <connections>
                         <action selector="deleteNode:" target="-2" id="dgm-SC-hn5"/>
                     </connections>
                 </menuItem>
+                <menuItem isSeparatorItem="YES" id="giL-0Q-HTl"/>
+                <menuItem title="Copy Value" keyEquivalent="c" id="UuQ-79-VL3">
+                    <connections>
+                        <action selector="copy:" target="-2" id="HsR-MZ-ayB"/>
+                    </connections>
+                </menuItem>
             </items>
             <point key="canvasLocation" x="887" y="210"/>
         </menu>