Merge branch 'master' of ssh://212.235.189.51:22122/codeq-web

6 files changed, 228 insertions, 229 deletions

diff --git a/css/codeq/console.css b/css/codeq/console.css
index 4290eea..2f5e9cf 100644
--- a/css/codeq/console.css
+++ b/css/codeq/console.css
@@ -1,9 +1,17 @@
 .cq-con {
     color: greenyellow;
     font-family: "Courier Menlo", Monaco, Consolas, "Courier New", monospace;
-    font-size: medium;
     word-break: break-all;
 }
+.cq-con-line {
+    white-space: pre-wrap;
+    background-color: transparent;
+    border: none;
+    color: inherit;
+    line-height: inherit;
+    margin: 0;
+    padding: 0;
+}
 .cq-con-text {
 
 }
@@ -15,3 +23,10 @@
     color: greenyellow;
     background: black;
 }
+
+.cq-con-text.input {
+    color: #a6e1ec;
+}
+.cq-con-text.error {
+    color: #d9534f;
+}
\ No newline at end of file
diff --git a/index.html b/index.html
index a7769fd..64ac568 100644
--- a/index.html
+++ b/index.html
@@ -89,8 +89,6 @@
                 <div class="col-lg-3 col-md-6 col-sm-12 block">
                     <nav class="navbar navbar-default" id="block-toolbar">
                         <div class="container-fluid">
-                            <button type="button" class="btn btn-default navbar-btn" id="btn_code_run">Run</button>
-                            <button type="button" class="btn btn-default navbar-btn" id="btn_code_break">Break</button>
                             <button type="button" class="btn btn-default navbar-btn" id="btn_code_hint">Hint</button>
                             <button type="button" class="btn btn-default navbar-btn" id="btn_code_test">Test</button>
                         </div>
diff --git a/js/codeq/comms.js b/js/codeq/comms.js
index de6f918..db9b7b5 100644
--- a/js/codeq/comms.js
+++ b/js/codeq/comms.js
@@ -86,13 +86,13 @@
 
             event = m.event;
             if (typeof event !== 'string') {
-                codeq.log.warn('Incoming message without a TID and with no event name, dropping it on the floor: ' + data);
+                codeq.log.info('Incoming message without a TID and with no event name, dropping it on the floor: ' + data);
                 return;
             }
 
             handlers = requestHandlers[event];
             if (!handlers) {
-                codeq.log.warn('Incoming event message cannot be handled: no handler registered for ' + event);
+                codeq.log.info('Incoming event message cannot be handled: no handler registered for ' + event);
                 return;
             }
 
diff --git a/js/codeq/console.js b/js/codeq/console.js
index ddf4ce6..99c1550 100644
--- a/js/codeq/console.js
+++ b/js/codeq/console.js
@@ -176,7 +176,7 @@
                     jq1, jq2, jqCursor;
 
                 if (!jqLine) {
-                    jqLine = $('<div class="' + lineDescriptor.className + '"></div>');
+                    jqLine = $('<pre class="cq-con-line ' + lineDescriptor.className + '"></pre>');
                     if (lineDescriptor.row == 0) {
                         jqContent.prepend(jqLine);
                     }
@@ -263,11 +263,12 @@
             handler = {
                 'setLineBuffered': function () { lineBuffered = true; },
                 'setNotBuffered': function () { lineBuffered = false; },
-                'onInput': false, // the caller should assign a function here, that takes input as parameter
+                'onInput': false, // the caller should assign a function here, that takes input as parameter, and optionally returns a promise which is then waited to be resolved before further input is accepted
                 'onKeypress': false, // same, but it takes a keycode, and returns a keycode
                 'inputEnable': function () { inputDisabled = false; },
                 'inputDisable': function () { inputDisabled = true; },
                 'keyMaps': {}, // will be filled in later
+                'leftmostCol': 0, // the column from where editing is possible; it is not possible to delete or change a character to the left of this column
 
                 'reflow': function () {
                     var startRow, endRow, i, lineDescriptor;
@@ -463,7 +464,8 @@
                 },
 
                 'moveLeft': function () {
-                    if (currentCol > 0) {
+                    var leftmost = typeof this.leftmostCol === 'number' && this.leftmostCol || 0;
+                    if (currentCol > leftmost) {
                         currentCol--;
                         renderLine(lines[currentRow]);
                     }
@@ -479,8 +481,9 @@
 
                 'deleteCharacterLeft': function () {
                     var lineDescriptor = lines[currentRow],
-                        content = lineDescriptor.content;
-                    if ((currentCol > 0) && (currentCol <= content.length)) {
+                        content = lineDescriptor.content,
+                        leftmost = typeof this.leftmostCol === 'number' && this.leftmostCol || 0;
+                    if ((currentCol > leftmost) && (currentCol <= content.length)) {
                         currentCol--;
                         lineDescriptor.content = content.substring(0, currentCol) + content.substring(currentCol + 1);
                         renderLine(lineDescriptor);
@@ -547,65 +550,88 @@
                 }
             },
 
+            internallyDisabled = false,
+
             handleInput = function (chars) {
-                var cookedChars = chars, // default
-                    startingRow = currentRow,
-                    dh, i;
+                var isPastedFromClipboard = clipboardPasteInProgress || !aKeyIsDown,
+                    newLines = chars.split('\n'),
+                    N = newLines.length,
+                    lastLineIndex = N - 1,
+                    i, promise;
 
-                if (inputDisabled) {
+                if (inputDisabled || internallyDisabled) {
                     // flatly ignore
                     clipboardPasteInProgress = false;
                     return;
                 }
 
-                // first cook the input
-                if (typeof handler.onKeypress === 'function') {
-                    try {
-                        cookedChars = handler.onKeypress(chars, clipboardPasteInProgress || !aKeyIsDown);
-                    }
-                    catch (e) {
-                        // TODO: log error
-                    }
-                }
+                internallyDisabled = true;
+                promise = Q();
 
-                if (!cookedChars) {
-                    // nothing to append
-                    clipboardPasteInProgress = false;
-                    return;
-                }
+                for (i = 0; i < N; i++) {
+                    promise = promise
+                        .then((function (newLine, lineIndex) {return function () {
+                            var cookedChars = lineIndex < lastLineIndex ? newLine + '\n' : newLine, // default
+                                thisRow = currentRow,
+                                leftmost = typeof handler.leftmostCol === 'number' && handler.leftmostCol || 0,
+                                dh;
 
-                // now serve the cooking
-                handler.insertAtCursor(cookedChars, 'input'); // append what we have to the display
-                if (typeof handler.onInput === 'function') { // now tell the owner what we've done
-                    if (lineBuffered) {
-                        if (currentRow !== startingRow) {
-                            // in line-buffered mode emit each line separately, except for the last (current) line
-                            for (i = startingRow; i < lines.length; i++) {
+                            // first cook the input
+                            if (typeof handler.onKeypress === 'function') {
+                                // only invoke the handler if the newLine is not an empty string, otherwise cookedChars = ''
                                 try {
-                                    handler.onInput(lines[i].content);
+                                    cookedChars = cookedChars && handler.onKeypress(cookedChars, isPastedFromClipboard);
                                 }
                                 catch (e) {
-                                    // TODO: log error
+                                    codeq.log.error('Error during invocation of terminal onKeypress: ' + e, e);
                                 }
                             }
-                        }
-                    }
-                    else {
-                        try {
-                            handler.onInput(cookedChars);
-                        }
-                        catch (e) {
-                            // TODO: log error
-                        }
-                    }
+
+                            if (!cookedChars) {
+                                // nothing to append
+                                return;
+                            }
+
+                            // now serve the cooking
+                            handler.insertAtCursor(cookedChars, 'input'); // append what we have to the display
+                            // scroll to bottom on input
+                            dh = jqContent.height() - jqElt.height();
+                            if (dh > 0)
+                                jqElt.scrollTop(dh);
+
+                            if (typeof handler.onInput === 'function') { // now tell the owner what we've done
+                                if (lineBuffered) {
+                                    if (thisRow < currentRow) {
+                                        // in line-buffered mode emit each line separately, except for the last (current) line
+                                        try {
+                                            return handler.onInput(lines[thisRow].content.substring(leftmost));
+                                        }
+                                        catch (e) {
+                                            codeq.log.error('Error while invoking terminal onInput: ' + e, e);
+                                        }
+                                    }
+                                }
+                                else if (cookedChars) {
+                                    try {
+                                        return handler.onInput(cookedChars);
+                                    }
+                                    catch (e) {
+                                        codeq.log.error('Error while invoking terminal onInput: ' + e, e);
+                                    }
+                                }
+                            }
+
+                        };})(newLines[i], i))
+                        .fail(function (e) {
+                            codeq.log.error('Error in handleInput loop: ' + e, e);
+                        });
                 }
 
-                clipboardPasteInProgress = false;
+                promise.fin(function () {
+                    internallyDisabled = false;
+                }).done();
 
-                // scroll to bottom on input
-                dh = jqContent.height() - jqElt.height();
-                if (dh > 0)
-                    jqElt.scrollTop(dh);
+                clipboardPasteInProgress = false;
             },
 
             clipboardPasteInProgress = false, // whether the previous keydown was a CTRL+V or shift+insert
@@ -646,7 +672,7 @@
         jqInput.on('keydown', function (evt) {
             var modifiers = ['' + (0 + evt.shiftKey), '' + (0 + (evt.ctrlKey || evt.metaKey)), '' + (0 + evt.altKey)].join(''),
                 handlersForModifiers = handler.keyMaps[modifiers],
-                acceptKeydown = !inputDisabled, // the default value
+                acceptKeydown = !(inputDisabled || internallyDisabled), // the default value
                 eventInfo = processKeyboardEvent(evt),
                 handlerForKeydown = handlersForModifiers && handlersForModifiers[eventInfo.code];
 
diff --git a/js/prolog.js b/js/prolog.js
index 7ea8ce3..2868830 100644
--- a/js/prolog.js
+++ b/js/prolog.js
@@ -8,80 +8,82 @@
 
     var makePrologTerminalHandler = function (jqConsole, editor, problem_id, activityHandler) {
         var promptMode = true, // default: query composition; alternative: query result browsing
+            terminal = codeq.makeConsole(jqConsole, {
+                'greeting': 'CodeQ Prolog terminal proxy'
+            }),
             tcs = function terminalCommandSuccess (data) {
                 var t, lines, i;
-                terminal.resume();
                 if (data.code === 0) {
                     t = data.terminal;
-                    lines = t.messages;
-                    for (i = 0; i < lines.length; i++) {
-                        terminal.echo(lines[i]);
-                    }
+                    terminal.append(t.messages.join('\n'), 'output');
                     promptMode = !t.have_more;
                 }
                 else {
-                    terminal.error(data.message);
+                    terminal.append(data.message, 'error');
                     promptMode = true;
                 }
+                if (promptMode) {
+                    terminal.setLineBuffered();
+                    terminal.append('.\n?- ', 'output');
+                }
             },
             tcf = function terminalCommandFailed (error) {
-                terminal.resume();
-                terminal.exception(error);
                 promptMode = true;
-            },
-            terminal = jqConsole.terminal(function (command, terminal) {
-                if (promptMode) {
-                    terminal.pause();
-                    codeq.comms.sendQuery({
+                terminal.setLineBuffered();
+                terminal.append(error + '\n', 'error');
+                terminal.append('?- ', 'output');
+            };
+
+        terminal.onKeypress = function (c) {
+            if (promptMode) return c; // query composition: return the character unchanged
+            switch (c) {
+                case ' ':
+                case ';':
+                case '\n':
+                    return ';'; // show next answer on space, semicolon or enter
+                default:
+                    return '.'; // everything else: stop searching for answers
+            }
+        };
+
+        terminal.onInput = function (command) {
+            if (promptMode) {
+                promptMode = false;
+                terminal.setNotBuffered();
+                return codeq.comms.sendQuery({
+                    'problem_id': problem_id,
+                    'step': 'run',
+                    'program': editor.getDoc().getValue(),
+                    'query': command,
+                    'trace': activityHandler.addAndPurge({'typ': 'slv', 'qry': command})
+                }, problem_id).then(tcs, tcf);
+            }
+            else {
+                terminal.append('\n', 'input');
+                if (command == ';') {
+                    // show next answer
+                    return codeq.comms.sendQuery({
                         'problem_id': problem_id,
-                        'step': 'run',
-                        'program': editor.getDoc().getValue(),
-                        'query': command,
-                        'trace': activityHandler.addAndPurge({'typ': 'slv', 'qry': command})
-                    }, problem_id).then(tcs, tcf).done();
+                        'step': 'next',
+                        'trace': activityHandler.addAndPurge({'typ': 'nxt'})
+                    }, problem_id).then(tcs, tcf);
                 }
                 else {
-                    // not in prompt mode -- we should never land here, but handle it anyway
-                    codeq.comms.sendQuery({
+                    // stop searching for answers
+                    return codeq.comms.sendQuery({
                         'problem_id': problem_id,
                         'step': 'end',
                         'trace': activityHandler.addAndPurge({'typ': 'stp'})
-                    }, problem_id).then(tcs, tcf).done();
-                }
-            }, {
-                'history': true,
-                'prompt': '?- ',
-                'greetings': 'CodeQ prolog terminal proxy',
-                'exit': false,
-                'clear': false,
-                'keypress': function (event, terminal) {
-                    if (promptMode) return true;
-                    setTimeout(function () {
-                        terminal.echo(''); // send newline after semicolon or full-stop
-                        terminal.pause();
-                    }, 0);
-                    if ((event.which == 32) || (event.which == 59) || (event.which == 110)) {
-                        // space or semicolon or n -> show next answer
-                        event.which = 59; // semicolon
-                        codeq.comms.sendQuery({
-                            'problem_id': problem_id,
-                            'step': 'next',
-                            'trace': activityHandler.addAndPurge({'typ': 'nxt'})
-                        }, problem_id).then(tcs, tcf).done();
-                    }
-                    else {
-                        // everything else: stop searching for answers
-                        event.which = 46; // full stop
-                        codeq.comms.sendQuery({
-                            'problem_id': problem_id,
-                            'step': 'end',
-                            'trace': activityHandler.addAndPurge({'typ': 'stp'})
-                        }, problem_id).then(tcs, tcf).done();
-                    }
+                    }, problem_id).then(tcs, tcf);
                 }
-            });
 
-        return {};
+            }
+        };
+
+        terminal.leftmostCol = 3;
+        terminal.append('?- ', 'output');
+
+        return terminal;
     };
 
     var makeActivityHandler = function (editor, problem_id) {
@@ -108,16 +110,11 @@
             };
 
         return {
-            "trace": function (trace) {
+            'queueTrace': function (trace) {
                 trace['dt'] = deltaActivityMillis();
-                return trace;
-            },
-            'queue': function (trace) {
                 queue.push(trace);
-                if (ts === null) setTimeout(timer, 10000); // flush every 10 seconds
-            },
-            'queueTrace': function (trace) {
-                this.queue(this.trace(trace));
+                if (ts === null) ts = setTimeout(timer, 10000); // flush every 10 seconds
+                return this;
             },
             'flush': flush,
             'addAndPurge': function (trace) {
@@ -148,21 +145,7 @@
             jqHints = $('#info'),
             editor = CodeMirror(jqEditor[0], { cursorHeight: 0.85, lineNumbers: true, matchBrackets: true }),
             activityHandler = makeActivityHandler(editor, problem.id),
-/*            controller = jqConsole.console({
-                promptLabel: '?- ',
-                commandValidate: function (line) {
-                    return !!line;
-                },
-                commandHandle: function (line) {
-                    return [{msg:'Not implemented.', className:'console-response'}];
-                },
-                autofocus: false,
-                animateScroll: false,
-                promptHistory: false,
-                welcomeMessage: 'Prolog REPL.'
-            }),*/
             terminal = makePrologTerminalHandler(jqConsole, editor, problem.id, activityHandler),
-            /** Object.<string, HintDefinition> */
             hintDefs = problem.hint,
             hintCounter = 0, // for generating unique class-names
             hintCleaners = [],
@@ -296,6 +279,7 @@
 
         var handler = {
             destroy: function () {
+                terminal.destroy();
                 jqDescription.empty();
                 jqEditor.empty(); // TODO: perhaps you do not want to "free" the editor, just empty it
                 jqConsole.empty(); // TODO: the same with the console
@@ -360,58 +344,57 @@
 //        $(jqButtons.get(1)).on('click', function () { handler.processServerHints([{id:'popup_unknown', start: 20, end: 26}]); });
 //        $(jqButtons.get(2)).on('click', function () { handler.processServerHints([{id:'drop_down', start: 20, end: 26, choices:['ena', 'dva', 'tri']}]); });
 
-        $('#btn_code_run').on('click', function () {
-            var doc = editor.getDoc();
-//            codeq.comms.sendActivity({'typ': 'slv', 'dt': dt, 'qry': });
-//            handler.processServerHints([{id:'list_empty'}]);
-        });
-        $('#btn_code_break').on('click', function () {
-//            handler.processServerHints([{id:'popup_unknown', start: 20, end: 26}]);
-        });
         $('#btn_code_hint').on('click', function () {
-//            handler.processServerHints([{id:'drop_down', start: 20, end: 26, choices:['ena', 'dva', 'tri']}]);
-            jqConsole.echo('?- hint.');
-            jqConsole.pause();
+            terminal.append('hint.\n', 'input');
+            terminal.inputDisable();
             var doc = editor.getDoc();
             codeq.comms.sendHint({
-                'language': 'prolog',
-                'program': editor.getDoc().getValue(),
-                'problem_id': problem.id
-            }).then(
-                function hintSuccess(data) {
-                    jqConsole.resume();
-                    if (data.code === 0)
-                        handler.processServerHints(data.hints);
-                    else
-                        jqConsole.error(data.message);
-                },
-                function hintFailed (error) {
-                    jqConsole.resume();
-                    jqConsole.exception(error);
-                }
-            ).done();
+                    'language': 'prolog',
+                    'program': editor.getDoc().getValue(),
+                    'problem_id': problem.id
+                })
+                .then(
+                    function hintSuccess(data) {
+                        if (data.code === 0)
+                            handler.processServerHints(data.hints);
+                        else
+                            terminal.append(data.message + '\n', 'error');
+                    },
+                    function hintFailed (error) {
+                        terminal.append(error + '\n', 'error');
+                    }
+                )
+                .fin(function () {
+                    terminal.inputEnable();
+                    terminal.append('?- ', 'output');
+                })
+                .done();
         });
         $('#btn_code_test').on('click', function () {
-            jqConsole.echo('?- test.');
-            jqConsole.pause();
+            terminal.append('test.\n', 'input');
+            terminal.inputDisable();
             var doc = editor.getDoc();
             codeq.comms.sendTest({
-                'language': 'prolog',
-                'program': editor.getDoc().getValue(),
-                'problem_id': problem.id
-            }).then(
-                function testSuccess(data) {
-                    jqConsole.resume();
-                    if (data.code === 0)
-                        handler.processServerHints(data.hints);
-                    else
-                        jqConsole.error(data.message);
-                },
-                function testFailed (error) {
-                    jqConsole.resume();
-                    jqConsole.exception(error);
-                }
-            ).done();
+                    'language': 'prolog',
+                    'program': editor.getDoc().getValue(),
+                    'problem_id': problem.id
+                })
+                .then(
+                    function testSuccess(data) {
+                        if (data.code === 0)
+                            handler.processServerHints(data.hints);
+                        else
+                            terminal.append(data.message + '\n', 'error');
+                    },
+                    function testFailed (error) {
+                        terminal.append(error + '\n', 'error');
+                    }
+                )
+                .fin(function () {
+                    terminal.inputEnable();
+                    terminal.append('?- ', 'output');
+                })
+                .done();
         });
 
         return handler;
diff --git a/js/python.js b/js/python.js
index d16cc72..7d7458e 100644
--- a/js/python.js
+++ b/js/python.js
@@ -8,51 +8,40 @@
 
     var makePythonTerminalHandler = function (jqConsole, editor, problem_id, activityHandler) {
         var terminal = codeq.makeConsole(jqConsole, {
-            'greeting': 'CodeQ Python terminal proxy'
-        });
+                'greeting': 'CodeQ Python terminal proxy'
+            }),
+            tcs = function terminalCommandSuccess (data) {
+                if (data.code !== 0) {
+                    terminal.append(data.message, 'error');
+                }
+            },
+            tcf = function terminalCommandFailed (error) {
+                terminal.append(error + '\n', 'error');
+            };
+
         terminal.onInput = function (text) {
-            if (!text)
-                return;
-            codeq.comms.sendPush({
+            return codeq.comms.sendPush({
                 'text': text + '\n'
-            }).then(
-                function pushSuccess (data) {
-                    if (data.code !== 0)
-                        terminal.append('error: ' + data.message);
-                },
-                function pushFailed (error) {
-                    terminal.append('exception: '+ error);
-                }
-            ).done();
+            }).then(tcs, tcf);
         };
 
-        var interval_id = setInterval(function () {
-            codeq.comms.sendPull({}).then(
-                function pullSuccess (data) {
-                    if (data.code === 0) {
-                        t = data.terminal;
-                        if (!t.text)
-                            return;
-                        terminal.append(t.text);
-                    }
-                    else {
-                        terminal.append('error: ' + data.message);
-                    }
-                },
-                function pullFailed (error) {
-                    terminal.append('exception: '+ error);
-                }
-            ).done();
-        }, 200);
+        codeq.comms.on('terminal_output', function (data) {
+            var text = data.text;
+            terminal.append(text, 'output');
+            lines = text.split('\n');
+            terminal.leftmostCol = lines[lines.length-1].length;
+        });
+
+        terminal.leftmostCol = 1;
 
         return terminal;
     };
 
-    var makeActivityHandler = function (editor) {
+    var makeActivityHandler = function (editor, problem_id) {
         var lastActivityMillis = Date.now(),
             deltaActivityMillis = function deltaActivityMillisFunc () {
                 var now = Date.now(),
-                    dt = Math.max(0, Math.min(30000, now - lastActivityMillis)); // 0 sec <= dt <= 30 sec
+                    dt = now - lastActivityMillis;
                 lastActivityMillis = now;
                 return dt;
             },
@@ -62,7 +51,7 @@
                 var promise;
                 ts = null;
                 if (queue.length === 0) return Q(true);
-                promise = codeq.comms.sendActivity(queue, editor.getDoc().getValue());
+                promise = codeq.comms.sendActivity(queue, editor.getDoc().getValue(), problem_id);
                 queue.length = 0;
                 return promise;
             },
@@ -72,17 +61,11 @@
             };
 
         return {
-            "trace": function (trace) {
+            'queueTrace': function (trace) {
                 trace['dt'] = deltaActivityMillis();
-                return trace;
-            },
-            'queue': function (trace) {
                 queue.push(trace);
                 if (ts === null) setTimeout(timer, 10000); // flush every 10 seconds
             },
-            'queueTrace': function (trace) {
-                this.queue(this.trace(trace));
-            },
             'flush': flush,
             'addAndPurge': function (trace) {
                 var accumulatedTrace = queue;
@@ -111,10 +94,8 @@
             jqConsole = $('#console'),
             jqHints = $('#info'),
             editor = CodeMirror(jqEditor[0], { cursorHeight: 0.85, lineNumbers: true, matchBrackets: true, mode: 'python' }),
-            activityHandler = makeActivityHandler(editor),
+            activityHandler = makeActivityHandler(editor, problem.id),
             terminal = makePythonTerminalHandler(jqConsole, editor, problem.id, activityHandler),
-
-            /** Object.<string, HintDefinition> */
             hintDefs = problem.hint,
             hintCounter = 0, // for generating unique class-names
             hintCleaners = [],
@@ -248,6 +229,7 @@
 
         var handler = {
             destroy: function () {
+                terminal.destroy();
                 jqDescription.empty();
                 jqEditor.empty(); // TODO: perhaps you do not want to "free" the editor, just empty it
                 jqConsole.empty(); // TODO: the same with the console
@@ -312,17 +294,8 @@
 //        $(jqButtons.get(1)).on('click', function () { handler.processServerHints([{id:'popup_unknown', start: 20, end: 26}]); });
 //        $(jqButtons.get(2)).on('click', function () { handler.processServerHints([{id:'drop_down', start: 20, end: 26, choices:['ena', 'dva', 'tri']}]); });
 
-        $('#btn_code_run').on('click', function () {
-            var doc = editor.getDoc();
-//            codeq.comms.sendActivity({'typ': 'slv', 'dt': dt, 'qry': });
-//            handler.processServerHints([{id:'list_empty'}]);
-        });
-        $('#btn_code_break').on('click', function () {
-//            handler.processServerHints([{id:'popup_unknown', start: 20, end: 26}]);
-        });
         $('#btn_code_hint').on('click', function () {
 //            handler.processServerHints([{id:'drop_down', start: 20, end: 26, choices:['ena', 'dva', 'tri']}]);
-            terminal.append('>>> hint\n');
             var doc = editor.getDoc();
             codeq.comms.sendHint({
                 'language': 'python',
@@ -341,7 +314,6 @@
             ).done();
         });
         $('#btn_code_test').on('click', function () {
-            terminal.append('>>> test\n');
             var doc = editor.getDoc();
             codeq.comms.sendTest({
                 'language': 'python',
@@ -360,6 +332,11 @@
             ).done();
         });
 
+        // TODO first line of interpreter output is buffered without this, why?
+        codeq.comms.sendPush({
+            'text': ''
+        });
+
         return handler;
     };
 })();