PR for issue #60: expect-like interaction support

src/main/groovy/org/hidetake/groovy/ssh/extension/Shell.groovy

@@ -20,4 +20,12 @@ trait Shell implements SessionExtension {
         assert settings != null, 'settings must not be null'
         operations.shell(operationSettings + new OperationSettings(settings))
     }
+
+    /**
+     * Performs an expect-like session
+     * @param interaction sequence of 'send' and 'expect' instructions
+     */
+    void shellExpect(Closure interaction){
+        operations.shellExpect(interaction)
+    }
 }

src/main/groovy/org/hidetake/groovy/ssh/operation/DefaultOperations.groovy

@@ -10,6 +10,8 @@ import org.hidetake.groovy.ssh.extension.settings.LocalPortForwardSettings
 import org.hidetake.groovy.ssh.extension.settings.RemotePortForwardSettings
 import org.hidetake.groovy.ssh.interaction.Interaction
 import org.hidetake.groovy.ssh.session.BadExitStatusException
+import org.hidetake.groovy.ssh.operation.expect.Expect
+import com.jcraft.jsch.ChannelShell
 
 import static org.hidetake.groovy.ssh.util.Utility.callWithDelegate
 
@@ -208,4 +210,20 @@ class DefaultOperations implements Operations {
                 break
         }
     }
+
+
+    @Override
+    void shellExpect(Closure interaction) {
+        ChannelShell channel = connection.createShellChannel(null)
+        Expect expectObj = new Expect(channel.getInputStream(), channel.getOutputStream())
+        channel.connect()
+        interaction.delegate = expectObj
+        try {
+            interaction.call()
+        }
+        finally {
+            expectObj.close()
+            channel.disconnect()
+        }
+    }
 }

src/main/groovy/org/hidetake/groovy/ssh/operation/DryRunOperations.groovy

@@ -5,6 +5,7 @@ import org.hidetake.groovy.ssh.extension.settings.LocalPortForwardSettings
 import org.hidetake.groovy.ssh.core.settings.OperationSettings
 import org.hidetake.groovy.ssh.core.Remote
 import org.hidetake.groovy.ssh.extension.settings.RemotePortForwardSettings
+import org.hidetake.groovy.ssh.operation.expect.DryRunExpect
 
 /**
  * Dry-run implementation of {@link Operations}.
@@ -25,6 +26,13 @@ class DryRunOperations implements Operations {
         log.info("[dry-run] Executing a shell")
     }
 
+    @Override
+    void shellExpect(Closure interaction) {
+        DryRunExpect expectObj = new DryRunExpect()
+        interaction.delegate = expectObj
+        interaction.call()
+    }
+
     @Override
     String execute(OperationSettings settings, String command, Closure callback) {
         log.info("[dry-run] Executing the command ($command)")

src/main/groovy/org/hidetake/groovy/ssh/operation/Operations.groovy

@@ -30,4 +30,6 @@ interface Operations {
      * @return result of the closure
      */
     def sftp(@DelegatesTo(SftpOperations) Closure closure)
+
+    void shellExpect(Closure interaction)
 }

src/main/groovy/org/hidetake/groovy/ssh/operation/expect/DryRunExpect.groovy

@@ -0,0 +1,20 @@
+package org.hidetake.groovy.ssh.operation.expect
+
+import groovy.util.logging.Slf4j
+
+/**
+ * Dry-run implementation of {@link Expect}.
+ *
+ * @author Romano Zabini
+ */
+@Slf4j
+class DryRunExpect {
+
+    def expectOrThrow(int timeout, Object... patterns){
+        log.info("waiting {} seconds for: {}", timeout, patterns)
+    }
+
+    def send(String command){
+        log.info("sending command: {}", command)
+    }
+}