transform the wall into a python console

lib/gui_qt.py

@@ -395,7 +395,7 @@ class ElectrumWindow(QMainWindow):
         self.wallet = wallet
         self.config = config
         self.wallet.interface.register_callback('updated', self.update_callback)
-        self.wallet.interface.register_callback('connected', self.update_callback)
+        self.wallet.interface.register_callback('banner', lambda: self.emit(QtCore.SIGNAL('banner_signal')) )
         self.wallet.interface.register_callback('disconnected', self.update_callback)
         self.wallet.interface.register_callback('disconnecting', self.update_callback)
 
@@ -412,7 +412,7 @@ class ElectrumWindow(QMainWindow):
         tabs.addTab(self.create_send_tab(), _('Send') )
         tabs.addTab(self.create_receive_tab(), _('Receive') )
         tabs.addTab(self.create_contacts_tab(), _('Contacts') )
-        tabs.addTab(self.create_wall_tab(), _('Wall') )
+        tabs.addTab(self.create_wall_tab(), _('Console') )
         tabs.setMinimumSize(600, 400)
         tabs.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
         self.setCentralWidget(tabs)
@@ -430,7 +430,7 @@ class ElectrumWindow(QMainWindow):
         QShortcut(QKeySequence("Ctrl+PgDown"), self, lambda: tabs.setCurrentIndex( (tabs.currentIndex() + 1 )%tabs.count() ))
         
         self.connect(self, QtCore.SIGNAL('updatesignal'), self.update_wallet)
-        #self.connect(self, SIGNAL('editamount'), self.edit_amount)
+        self.connect(self, QtCore.SIGNAL('banner_signal'), lambda: self.console.showMessage(self.wallet.banner) )
         self.history_list.setFocus(True)
         
         self.exchanger = exchange_rate.Exchanger(self)
@@ -496,12 +496,12 @@ class ElectrumWindow(QMainWindow):
         self.status_button.setIcon( icon )
 
         if self.wallet.up_to_date or not self.wallet.interface.is_connected:
-            self.textbox.setText( self.wallet.banner )
             self.update_history_tab()
             self.update_receive_tab()
             self.update_contacts_tab()
             self.update_completions()
 
+
     def create_quote_text(self, btc_balance):
         quote_currency = self.config.get("currency", "None")
         quote_balance = self.exchanger.exchange(btc_balance, quote_currency)
@@ -1244,11 +1244,12 @@ class ElectrumWindow(QMainWindow):
 
         l.setCurrentItem(l.topLevelItem(0))
 
+
     def create_wall_tab(self):
-        self.textbox = textbox = QTextEdit(self)
+        from qt_console import Console
-        textbox.setFont(QFont(MONOSPACE_FONT))
+        self.console = console = Console(startup_message=self.wallet.banner)
-        textbox.setReadOnly(True)
+        console.updateNamespace({'wallet' : self.wallet, 'interface' : self.wallet.interface})
-        return textbox
+        return console
 
 
     def create_status_bar(self):

lib/qt_console.py

@@ -0,0 +1,179 @@
+# source: http://stackoverflow.com/questions/2758159/how-to-embed-a-python-interpreter-in-a-pyqt-widget
+
+import sys, os
+import traceback
+from PyQt4 import QtCore
+from PyQt4 import QtGui
+
+class Console(QtGui.QPlainTextEdit):
+    def __init__(self, prompt='>> ', startup_message='', parent=None):
+        QtGui.QPlainTextEdit.__init__(self, parent)
+        self.prompt = prompt
+        self.history = []
+        self.namespace = {}
+        self.construct = []
+
+        self.setGeometry(50, 75, 600, 400)
+        self.setWordWrapMode(QtGui.QTextOption.WrapAnywhere)
+        self.setUndoRedoEnabled(False)
+        self.document().setDefaultFont(QtGui.QFont("monospace", 10, QtGui.QFont.Normal))
+        self.showMessage(startup_message)
+
+    def updateNamespace(self, namespace):
+        self.namespace.update(namespace)
+
+    def showMessage(self, message):
+        self.appendPlainText(message)
+        self.newPrompt()
+
+    def newPrompt(self):
+        if self.construct:
+            prompt = '.' * len(self.prompt)
+        else:
+            prompt = self.prompt
+        self.appendPlainText(prompt)
+        self.moveCursor(QtGui.QTextCursor.End)
+
+    def getCommand(self):
+        doc = self.document()
+        curr_line = unicode(doc.findBlockByLineNumber(doc.lineCount() - 1).text())
+        curr_line = curr_line.rstrip()
+        curr_line = curr_line[len(self.prompt):]
+        return curr_line
+
+    def setCommand(self, command):
+        if self.getCommand() == command:
+            return
+        self.moveCursor(QtGui.QTextCursor.End)
+        self.moveCursor(QtGui.QTextCursor.StartOfLine, QtGui.QTextCursor.KeepAnchor)
+        for i in range(len(self.prompt)):
+            self.moveCursor(QtGui.QTextCursor.Right, QtGui.QTextCursor.KeepAnchor)
+        self.textCursor().removeSelectedText()
+        self.textCursor().insertText(command)
+        self.moveCursor(QtGui.QTextCursor.End)
+
+    def getConstruct(self, command):
+        if self.construct:
+            prev_command = self.construct[-1]
+            self.construct.append(command)
+            if not prev_command and not command:
+                ret_val = '\n'.join(self.construct)
+                self.construct = []
+                return ret_val
+            else:
+                return ''
+        else:
+            if command and command[-1] == (':'):
+                self.construct.append(command)
+                return ''
+            else:
+                return command
+
+    def getHistory(self):
+        return self.history
+
+    def setHisory(self, history):
+        self.history = history
+
+    def addToHistory(self, command):
+        if command and (not self.history or self.history[-1] != command):
+            self.history.append(command)
+        self.history_index = len(self.history)
+
+    def getPrevHistoryEntry(self):
+        if self.history:
+            self.history_index = max(0, self.history_index - 1)
+            return self.history[self.history_index]
+        return ''
+
+    def getNextHistoryEntry(self):
+        if self.history:
+            hist_len = len(self.history)
+            self.history_index = min(hist_len, self.history_index + 1)
+            if self.history_index < hist_len:
+                return self.history[self.history_index]
+        return ''
+
+    def getCursorPosition(self):
+        return self.textCursor().columnNumber() - len(self.prompt)
+
+    def setCursorPosition(self, position):
+        self.moveCursor(QtGui.QTextCursor.StartOfLine)
+        for i in range(len(self.prompt) + position):
+            self.moveCursor(QtGui.QTextCursor.Right)
+
+    def runCommand(self):
+        command = self.getCommand()
+        self.addToHistory(command)
+
+        command = self.getConstruct(command)
+
+        if command:
+            tmp_stdout = sys.stdout
+
+            class stdoutProxy():
+                def __init__(self, write_func):
+                    self.write_func = write_func
+                    self.skip = False
+
+                def write(self, text):
+                    if not self.skip:
+                        stripped_text = text.rstrip('\n')
+                        self.write_func(stripped_text)
+                        QtCore.QCoreApplication.processEvents()
+                    self.skip = not self.skip
+
+            sys.stdout = stdoutProxy(self.appendPlainText)
+            try:
+                try:
+                    result = eval(command, self.namespace, self.namespace)
+                    if result != None:
+                        self.appendPlainText(repr(result))
+                except SyntaxError:
+                    exec command in self.namespace
+            except SystemExit:
+                self.close()
+            except:
+                traceback_lines = traceback.format_exc().split('\n')
+                # Remove traceback mentioning this file, and a linebreak
+                for i in (3,2,1,-1):
+                    traceback_lines.pop(i)
+                self.appendPlainText('\n'.join(traceback_lines))
+            sys.stdout = tmp_stdout
+        self.newPrompt()
+
+    def keyPressEvent(self, event):
+        if event.key() in (QtCore.Qt.Key_Enter, QtCore.Qt.Key_Return):
+            self.runCommand()
+            return
+        if event.key() == QtCore.Qt.Key_Home:
+            self.setCursorPosition(0)
+            return
+        if event.key() == QtCore.Qt.Key_PageUp:
+            return
+        elif event.key() in (QtCore.Qt.Key_Left, QtCore.Qt.Key_Backspace):
+            if self.getCursorPosition() == 0:
+                return
+        elif event.key() == QtCore.Qt.Key_Up:
+            self.setCommand(self.getPrevHistoryEntry())
+            return
+        elif event.key() == QtCore.Qt.Key_Down:
+            self.setCommand(self.getNextHistoryEntry())
+            return
+        #elif event.key() == QtCore.Qt.Key_D and event.modifiers() == QtCore.Qt.ControlModifier:
+        #    self.close()
+        super(Console, self).keyPressEvent(event)
+
+
+welcome_message = '''
+   ---------------------------------------------------------------
+     Welcome to a primitive Python interpreter.
+   ---------------------------------------------------------------
+'''
+
+if __name__ == '__main__':
+    app = QtGui.QApplication(sys.argv)
+    console = Console(startup_message=welcome_message)
+    console.updateNamespace({'myVar1' : app, 'myVar2' : 1234})
+    console.show();
+    sys.exit(app.exec_())

lib/wallet.py

@@ -1355,8 +1355,7 @@ class WalletSynchronizer(threading.Thread):
 
             elif method == 'server.banner':
                 self.wallet.banner = result
-                self.was_updated = True
+                self.interface.trigger_callback('banner')
-
             else:
                 print_error("Error: Unknown message:" + method + ", " + repr(params) + ", " + repr(result) )