If a command is rerun after exiting, close the old tab

Not quite the same as recycling the tab, but it has a much simpler
implementation.

Closes #3138

Signed-off-by: David Thompson <davthomp@redhat.com>

Author: datho7561

src/webview/openshift-terminal/openShiftTerminal.ts

@@ -74,6 +74,7 @@ class OpenShiftTerminal {
     private _file: string;
     private _args: string | string[];
     private _options;
+    private _name: string;
 
     private _sendTerminalData: (data: string) => void;
     private _sendExitMessage: () => void;
@@ -133,6 +134,7 @@ class OpenShiftTerminal {
         this._file = file;
         this._args = args;
         this._options = options;
+        this._name = options.name;
 
         this._disposables = [];
         this._headlessTerm = new Terminal({ allowProposedApi: true });
@@ -195,6 +197,15 @@ class OpenShiftTerminal {
         this._ptyExited = true;
     }
 
+    /**
+     * Returns the name of this terminal.
+     *
+     * @returns the name of this terminal
+     */
+    public get name() {
+        return this._name;
+    }
+
     /**
      * Returns the unique identifier of this terminal.
      *
@@ -321,6 +332,18 @@ class OpenShiftTerminal {
     public stopRendering(): void {
         this._terminalRendering = false;
     }
+
+    /**
+     * Close this terminal tab, assuming the process it's running exited.
+     *
+     * @throws if the process is still running
+     */
+    public closeTab(): void {
+        if (this.isPtyLive) {
+            throw new Error('Cannot close running terminal');
+        }
+        this._sendExitMessage();
+    }
 }
 
 /**
@@ -549,6 +572,14 @@ export class OpenShiftTerminalManager implements WebviewViewProvider {
             throw new Error(msg);
         }
 
+        // try to clean up an existing exited terminal in place of this one
+        for (const existingTerm of this.openShiftTerminals.values()) {
+            if (!existingTerm.isPtyLive && existingTerm.name === name) {
+                existingTerm.closeTab();
+                break;
+            }
+        }
+
         const newTermUUID = randomUUID();
 
         // create the object that manages the headless terminal and the pty.