fixes #69

ugs-core/src/com/willwinder/universalgcodesender/AbstractCommunicator.java

@@ -74,6 +74,8 @@ public AbstractCommunicator() {
     /*********************/
     abstract public void setSingleStepMode(boolean enable);
     abstract public boolean getSingleStepMode();
+    abstract public void setSingleBlockMode(boolean enable);
+    abstract public boolean getSingleBlockMode();
     abstract public void queueStringForComm(final String input);
     abstract public void queueStreamForComm(final GcodeStreamReader input);
     abstract public void sendByteImmediately(byte b) throws Exception;

ugs-core/src/com/willwinder/universalgcodesender/AbstractController.java

@@ -347,6 +347,21 @@ public boolean getSingleStepMode() {
         }
         return false;
     }
+
+    @Override
+    public void setSingleBlockMode(boolean enabled) {
+        if (this.comm != null) {
+            this.comm.setSingleBlockMode(enabled);
+        }
+    }
+
+    @Override
+    public boolean getSingleBlockMode() {
+        if (this.comm != null) {
+            return this.comm.getSingleBlockMode();
+        }
+        return false;
+    }
 
     @Override
     public void setStatusUpdatesEnabled(boolean enabled) {

ugs-core/src/com/willwinder/universalgcodesender/BufferedCommunicator.java

@@ -47,6 +47,7 @@ public abstract class BufferedCommunicator extends AbstractCommunicator {
     private int sentBufferSize = 0;
 
     private Boolean singleStepModeEnabled = false;
+    private Boolean singleBlockModeEnabled = false;
 
     abstract public int getBufferSize();
 
@@ -69,6 +70,16 @@ public void setSingleStepMode(boolean enable) {
     public boolean getSingleStepMode() {
         return this.singleStepModeEnabled;
     }
+
+    @Override
+    public void setSingleBlockMode(boolean enable) {
+        this.singleBlockModeEnabled = enable;
+    }
+
+    @Override
+    public boolean getSingleBlockMode() {
+        return this.singleBlockModeEnabled;
+    }
 
     /**
      * Add command to the command queue outside file mode. This is the only way
@@ -187,6 +198,32 @@ else if (!this.commandBuffer.isEmpty()) {
         }
         return null;
     }
+
+    private GcodeCommand peekNextCommand() {
+        GcodeCommand nc = null;
+
+        if (nextCommand != null) {
+            nc = nextCommand;
+        }
+        else if (!this.commandBuffer.isEmpty()) {
+            nc = new GcodeCommand(commandBuffer.peek());
+        }
+        else
+            try {
+                if (commandStream != null && commandStream.ready())
+                {
+                    nc = commandStream.peekNextCommand();
+                }
+            } catch (IOException ignored) {
+            // Fall through to null handling.
+            }
+
+        if (nc != null && nc.getCommandString().endsWith("\n")) {
+            nc.setCommand(nextCommand.getCommandString().trim());
+        }
+
+        return nc;
+    }
 
     /**
      * Streams anything in the command buffer to the comm port.
@@ -235,6 +272,18 @@ && allowMoreCommands()) {
                 e.printStackTrace();
                 System.exit(-1);
             }
+
+            // Single block mode: pause after this command is sent
+            // iff the next command is from the commandStream
+            // (ie do not pause for commandBuffer commands)
+            if( this.getSingleBlockMode() &&
+                commandBuffer.isEmpty() &&
+                peekNextCommand() != null &&
+                !peekNextCommand().getCommandString().isEmpty() ) {
+
+                logger.log(Level.INFO, "singleBlockMode: pausing");
+                pauseSend();
+            }
         }
     }
 

ugs-core/src/com/willwinder/universalgcodesender/IController.java

@@ -126,6 +126,8 @@ void jogMachine(int dirX, int dirY, int dirZ,
     */
     void setSingleStepMode(boolean enabled);
     boolean getSingleStepMode();
+    void setSingleBlockMode(boolean enabled);
+    boolean getSingleBlockMode();
 
     void setStatusUpdatesEnabled(boolean enabled);
     boolean getStatusUpdatesEnabled();

ugs-core/src/com/willwinder/universalgcodesender/model/GUIBackend.java

@@ -771,6 +771,7 @@ public void applySettingsToController(Settings settings, IController controller)
 
         try {
             controller.setSingleStepMode(settings.isSingleStepMode());
+            controller.setSingleBlockMode(settings.isSingleStepMode());
             controller.setStatusUpdatesEnabled(settings.isStatusUpdatesEnabled());
             controller.setStatusUpdateRate(settings.getStatusUpdateRate());
         } catch (Exception ex) {

ugs-core/src/com/willwinder/universalgcodesender/uielements/panels/ConnectionSettingsPanel.java

@@ -46,6 +46,8 @@ public class ConnectionSettingsPanel extends AbstractUGSSettings {
                 Localization.getString("sender.step.separateZ"));
     private final Checkbox singleStepMode = new Checkbox(
                 Localization.getString("sender.singlestep"));
+    private final Checkbox singleBlockMode = new Checkbox(
+                Localization.getString("sender.singleblock"));
     private final Checkbox statusPollingEnabled = new Checkbox(
                 Localization.getString("sender.status"));
     private final Spinner statusPollRate = new Spinner(
@@ -77,6 +79,7 @@ public ConnectionSettingsPanel(Settings settings) {
     public String getHelpMessage() {
         return Localization.getString("sender.help.verbose.console") + "\n\n" +
                 Localization.getString("sender.help.singlestep") + "\n\n" +
+                Localization.getString("sender.help.singleblock") + "\n\n" +
                 Localization.getString("sender.help.status") + "\n\n" +
                 Localization.getString("sender.help.status.rate") + "\n\n" +
                 Localization.getString("sender.help.state") + "\n\n";
@@ -87,6 +90,7 @@ public void save() {
         settings.setVerboseOutputEnabled(verboseConsoleOutput.getValue());
         settings.setUseZStepSize(useZStepSize.getValue());
         settings.setSingleStepMode(singleStepMode.getValue());
+        settings.setSingleBlockMode(singleBlockMode.getValue());
         settings.setStatusUpdatesEnabled(statusPollingEnabled.getValue());
         settings.setStatusUpdateRate((int)statusPollRate.getValue());
         //settings.setAutoConnectEnabled(autoConnect.getValue());
@@ -125,6 +129,9 @@ protected void updateComponentsInternal(Settings s) {
         singleStepMode.setSelected(s.isSingleStepMode());
         add(singleStepMode, "spanx, wrap");
 
+        singleBlockMode.setSelected(s.isSingleBlockMode());
+        add(singleBlockMode, "spanx, wrap");
+
         statusPollingEnabled.setSelected(s.isStatusUpdatesEnabled());
         add(statusPollingEnabled, "spanx, wrap");
 

ugs-core/src/com/willwinder/universalgcodesender/utils/GcodeStreamReader.java

@@ -98,6 +98,31 @@ public GcodeCommand getNextCommand() throws IOException {
                 Integer.parseInt(nextLine[COL_COMMAND_NUMBER]));
     }
 
+    /**
+     * Peek at the next command without moving the pointers
+     * NOTE: this calls mark() and reset() so reset() calls outside of
+     * peekNextCommand() may be interfered with by this.
+     * @return GcodeCommand containing next line
+     * @throws IOException
+     */
+    public GcodeCommand peekNextCommand() throws IOException {
+        if (numRowsRemaining == 0) return null;
+
+        reader.mark(NUM_COLUMNS);              // bookmark for rollback
+        String line = reader.readLine();
+        reader.reset();                        // rollback to mark
+
+        String nextLine[] = parseLine(line);
+        if (nextLine.length != NUM_COLUMNS) {
+            throw new IOException("Corrupt data found while processing gcode stream: " + line);
+        }
+        return new GcodeCommand(
+                nextLine[COL_PROCESSED_COMMAND],
+                nextLine[COL_ORIGINAL_COMMAND],
+                nextLine[COL_COMMENT],
+                Integer.parseInt(nextLine[COL_COMMAND_NUMBER]));
+    }
+
     @Override
     public void close() throws IOException {
         reader.close();

ugs-core/src/com/willwinder/universalgcodesender/utils/Settings.java

@@ -37,6 +37,7 @@ This file is part of Universal Gcode Sender (UGS).
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 
 public class Settings {
@@ -64,6 +65,7 @@ public class Settings {
     private WindowSettings mainWindowSettings = new WindowSettings(0,0,640,520);
     private WindowSettings visualizerWindowSettings = new WindowSettings(0,0,640,480);
     private boolean singleStepMode = false;
+    private boolean singleBlockMode = false;
     private boolean statusUpdatesEnabled = true;
     private int statusUpdateRate = 200;
     private Units preferredUnits = Units.MM;
@@ -313,6 +315,16 @@ public void setSingleStepMode(boolean singleStepMode) {
         changed();
     }
 
+    public boolean isSingleBlockMode() {
+        return singleBlockMode;
+    }
+
+    public void setSingleBlockMode(boolean singleBlockMode) {
+        logger.log(Level.INFO, "Setting singleBlockMode to ".concat((singleBlockMode)?"true":"false"));
+        this.singleBlockMode = singleBlockMode;
+        changed();
+    }
+
     public boolean isStatusUpdatesEnabled() {
         return statusUpdatesEnabled;
     }

ugs-core/src/com/willwinder/universalgcodesender/utils/SettingsFactory.java

@@ -136,6 +136,7 @@ private static void migrateOldSettings() {
                 out.setVerboseOutputEnabled(Boolean.valueOf(properties.getProperty("verboseOutput.enabled", FALSE)));
                 out.setFirmwareVersion(properties.getProperty("firmwareVersion", "GRBL"));
                 out.setSingleStepMode(Boolean.valueOf(properties.getProperty("singleStepMode", FALSE)));
+                out.setSingleBlockMode(Boolean.valueOf(properties.getProperty("singleBlockMode", FALSE)));
                 out.setStatusUpdatesEnabled(Boolean.valueOf(properties.getProperty("statusUpdatesEnabled", "true")));
                 out.setStatusUpdateRate(Integer.valueOf(properties.getProperty("statusUpdateRate", "200")));
                 out.updateMacro(1, null, null, properties.getProperty("customGcode1", "G0 X0 Y0;"));

ugs-core/src/resources/MessagesBundle_en_US.properties

@@ -163,6 +163,7 @@ sender.speed.percent = Speed override percent
 sender.command.length = Max command length
 sender.truncate = Truncate decimal digits
 sender.singlestep = Enable single step mode
+sender.singleblock = Enable single block mode
 sender.whitespace = Remove all whitespace in commands
 sender.status = Enable status polling
 sender.status.rate = Status poll rate (ms)
@@ -180,6 +181,7 @@ sender.help.speed.percent = Speed override percent\: Factor that speeds will be
 sender.help.command.length = Max command length\: Maximum length of a command before an error is triggered.
 sender.help.truncate = Truncate decimal digits\: Number of fractional digits that will be sent to firmware.
 sender.help.singlestep = Enable single step mode\: Turns on single step mode, this is very slow.
+sender.help.singleblock = Enable single block mode\: Pause sender after every block, useful for testing programs though extremely slow.
 sender.help.whitespace = Remove all whitespace\: Removes the usually unnecessary whitespace in gcode commands.
 sender.help.status = Enable status polling\: Turns on status polling for firmware if supported.
 sender.help.status.rate = Status poll rate\: The rate in milliseconds that status requests are sent at.

ugs-core/test/com/willwinder/universalgcodesender/BufferedCommunicatorTest.java

@@ -101,6 +101,16 @@ public void testSingleStepMode() {
         fail("Not implemented yet.");
     }
 
+    /**
+     * Test of setSingleBlockMode method of class BufferedCommunicator.
+     */
+    @Test
+    @Ignore
+    public void testSingleBlockMode() {
+        System.out.println("testSingleBlockMode");
+        fail("Not implemented yet.");
+    }
+
     /**
      * Test of getBufferSize method, of class BufferedCommunicator.
      */

ugs-platform/ugs-platform-ugscore/src/main/java/com/willwinder/ugs/nbp/core/windows/DiagnosticsTopComponent.java

@@ -95,6 +95,7 @@ private void initComponents() {
     this.labels.put("communicator:numActiveCommands", new JLabel("-----"));
     this.labels.put("communicator:isPaused", new JLabel("-----"));
     this.labels.put("communicator:getSingleStepMode", new JLabel("-----"));
+    this.labels.put("communicator:getSingleBlockMode", new JLabel("-----"));
 
     this.labels.put("settings:isHomingEnabled", new JLabel("-----"));
     this.labels.put("settings:getReportingUnits", new JLabel("-----"));