ACT & UI: Add "Show Setting" action for Cargo

src/main/kotlin/org/rust/ide/actions/CargoEditSettingsAction.kt

@@ -0,0 +1,23 @@
+/*
+ * Use of this source code is governed by the MIT license that can be
+ * found in the LICENSE file.
+ */
+
+package org.rust.ide.actions
+
+import com.intellij.openapi.actionSystem.AnAction
+import com.intellij.openapi.actionSystem.AnActionEvent
+import com.intellij.openapi.options.ShowSettingsUtil
+import com.intellij.openapi.project.DumbAware
+
+class CargoEditSettingsAction : AnAction(), DumbAware {
+
+    override fun update(e: AnActionEvent) {
+        super.update(e)
+        e.presentation.isEnabledAndVisible = e.project != null
+    }
+
+    override fun actionPerformed(e: AnActionEvent) {
+        ShowSettingsUtil.getInstance().showSettingsDialog(e.project, "Cargo")
+    }
+}

src/main/resources/META-INF/core.xml

@@ -980,6 +980,12 @@
                 icon="AllIcons.Actions.Collapseall"
                 use-shortcut-of="CollapseAll"/>
 
+        <action id="Cargo.ShowSettings"
+                class="org.rust.ide.actions.CargoEditSettingsAction" text="Cargo Settings"
+                description="Edit Cargo settings for the current project"
+                icon="AllIcons.General.Settings">
+        </action>
+
         <group id="Rust.Cargo">
             <reference id="Cargo.RefreshCargoProject"/>
             <reference id="Cargo.AttachCargoProject"/>
@@ -991,6 +997,8 @@
             <separator/>
             <reference id="Cargo.ExpandAll"/>
             <reference id="Cargo.CollapseAll"/>
+            <separator/>
+            <reference id="Cargo.ShowSettings"/>
         </group>
 
     </actions>