Converted Python console from C++ to Python.

This cleans python support a bit and makes a starting point for further improvements of the console.

It's possible to run the console also outside QGIS:

import qgis.console
qgis.console.show_console()



git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@12725 c8812cc2-4d05-0410-92ff-de0c093fc19c

python/CMakeLists.txt

@@ -99,6 +99,12 @@ ELSE (BINDINGS_GLOBAL_INSTALL)
 ENDIF (BINDINGS_GLOBAL_INSTALL)
 
 
+# python console
+PYQT4_WRAP_UI(PYUI_FILE ${CMAKE_SOURCE_DIR}/src/ui/qgspythondialog.ui)
+
+ADD_CUSTOM_TARGET(pythonconsole ALL DEPENDS ${PYUI_FILE})
+
+
 # Step 4: install built libs to python's site packages
-INSTALL(FILES __init__.py utils.py ${CMAKE_CURRENT_BINARY_DIR}/qgisconfig.py ${BINDINGS_LIBS} DESTINATION ${SITE_PKG_PATH}/qgis)
+INSTALL(FILES __init__.py utils.py console.py ${PYUI_FILE} ${CMAKE_CURRENT_BINARY_DIR}/qgisconfig.py ${BINDINGS_LIBS} DESTINATION ${SITE_PKG_PATH}/qgis)
 

python/console.py

@@ -0,0 +1,180 @@
+# -*- coding: utf-8 -*-
+
+from PyQt4.QtCore import *
+from PyQt4.QtGui import *
+
+import traceback
+import sys
+
+from ui_qgspythondialog import Ui_QgsPythonDialog
+
+_console = None
+
+
+def show_console():
+  """ called from QGIS to open the console """
+  global _console
+  if _console is None:
+    _console = QgsPythonConsole()
+  _console.show()
+  _console.raise_()
+  _console.setWindowState( _console.windowState() & ~Qt.WindowMinimized )
+  _console.activateWindow()
+
+
+
+_old_stdout = sys.stdout
+
+class QgisOutputCatcher:
+  def __init__(self):
+    self.data = ''
+  def write(self, stuff):
+    self.data += stuff
+  def get_and_clean_data(self):
+    tmp = self.data
+    self.data = ''
+    return tmp
+  def flush(self):
+    pass
+
+def installConsoleHook():
+  sys.stdout = QgisOutputCatcher()
+
+def uninstallConsoleHook():
+  sys.stdout = _old_stdout
+
+
+
+class ConsoleHistory(object):
+  def __init__(self):
+    self.cmds = []
+    self.pos = 0
+    self.active_cmd = u"" # active, not yet entered command
+
+  def add_cmd(self, command):
+    if len(command) != 0:
+      self.cmds.append(command)
+      self.pos = len(self.cmds)
+      self.active_cmd = u""
+
+  def get_previous_cmd(self, current):
+    if self.pos == 0:
+      return None
+
+    if self.pos == len(self.cmds):
+      self.active_cmd = current
+    else:
+      self.cmds[self.pos] = current
+
+    self.pos -= 1
+    return self.cmds[self.pos]
+
+  def get_next_cmd(self, current):
+
+    # if we're at active (last) command, don't move
+    if self.pos == len(self.cmds):
+      return None
+
+    self.cmds[self.pos] = current
+    self.pos += 1
+
+    if self.pos == len(self.cmds):
+      return self.active_cmd
+    else:
+      return self.cmds[self.pos]
+
+
+
+class QgsPythonConsole(QWidget, Ui_QgsPythonDialog):
+  def __init__(self, parent=None):
+    QWidget.__init__(self, parent)
+
+    self.setupUi(self)
+
+    # minimize button was not enabled on mac
+    self.setWindowFlags( self.windowFlags() | Qt.WindowMinimizeButtonHint )
+
+    self.history = ConsoleHistory()
+
+    self.console_globals = {}
+
+  def escapeHtml(self, text):
+    return text.replace("<", "&lt;").replace(">", "&gt;")
+
+  @pyqtSlot()
+  def on_pbnPrev_clicked(self):
+    cmd = self.history.get_previous_cmd( self.getCommand() )
+    if cmd is not None:
+      self.edtCmdLine.setText(cmd)
+
+  @pyqtSlot()
+  def on_pbnNext_clicked(self):
+    cmd = self.history.get_next_cmd( self.getCommand() )
+    if cmd is not None:
+      self.edtCmdLine.setText(cmd)
+
+  def getCommand(self):
+    return unicode(self.edtCmdLine.toPlainText())
+
+  def execute(self, single):
+    command = self.getCommand()
+
+    self.history.add_cmd(command)
+
+    try:
+      # run command
+      code = compile(command, '<console>', 'single' if single else 'exec')
+      res = eval(code, self.console_globals)
+      result = unicode( res ) if res is not None else u''
+
+      # get standard output
+      output = sys.stdout.get_and_clean_data()
+
+      #_old_stdout.write("cmd: '"+command+"'\n")
+      #_old_stdout.write("res: '"+result+"'\n")
+      #_old_stdout.write("out: '"+output+"'\n")
+      #_old_stdout.flush()
+
+      # escape the result so python objects display properly and
+      # we can still use html output to get nicely formatted display
+      output = self.escapeHtml( output ) + self.escapeHtml( result )
+      if len(output) != 0:
+        output += "<br>"
+
+    except Exception, e:
+      #lst = traceback.format_exception(sys.exc_type, sys.exc_value, sys.exc_traceback)
+      lst = traceback.format_exception_only(sys.exc_type, sys.exc_value)
+      errorText = "<br>".join(map(self.escapeHtml, lst))
+      output = "<font color=\"red\">" + errorText + "</font><br>"
+
+    s = "<b><font color=\"green\">&gt;&gt;&gt;</font> " + self.escapeHtml( command ) + "</b><br>" + output
+    self.edtCmdLine.setText("")
+
+    self.txtHistory.moveCursor(QTextCursor.End)
+    self.txtHistory.insertHtml(s)
+    self.txtHistory.moveCursor(QTextCursor.End)
+    self.txtHistory.ensureCursorVisible()
+
+  @pyqtSlot()
+  def on_pbnExecute_clicked(self):
+    self.execute(False)
+
+  @pyqtSlot()
+  def on_pbnEval_clicked(self):
+    self.execute(True)
+
+  def showEvent(self, event):
+    QWidget.showEvent(self, event)
+    installConsoleHook()
+
+  def closeEvent(self, event):
+    uninstallConsoleHook()
+    QWidget.closeEvent(self, event)
+
+
+if __name__ == '__main__':
+  import sys
+  a = QApplication(sys.argv)
+  w = QgsPythonConsole()
+  w.show()
+  a.exec_()

python/utils.py

@@ -55,40 +55,6 @@ def initInterface(pointer):
   iface = wrapinstance(pointer, QgisInterface)
 
 
-#######################
-# CONSOLE OUTPUT
-
-old_stdout = sys.stdout
-console_output = None
-
-# hook for python console so all output will be redirected
-# and then shown in console
-def console_displayhook(obj):
-  global console_output
-  console_output = obj
-
-class QgisOutputCatcher:
-  def __init__(self):
-    self.data = ''
-  def write(self, stuff):
-    self.data += stuff
-  def get_and_clean_data(self):
-    tmp = self.data
-    self.data = ''
-    return tmp
-  def flush(self):
-    pass
-
-
-def installConsoleHooks():
-  sys.displayhook = console_displayhook
-  sys.stdout = QgisOutputCatcher()
-
-def uninstallConsoleHooks():
-  sys.displayhook = sys.__displayhook__
-  sys.stdout = old_stdout
-
-
 #######################
 # PLUGINS
 

src/app/CMakeLists.txt

@@ -60,7 +60,6 @@ SET(QGIS_APP_SRCS
   qgspluginmanager.cpp
   qgspluginmetadata.cpp
   qgspluginregistry.cpp
-  qgspythondialog.cpp
   qgsprojectproperties.cpp
   qgsrasterlayerproperties.cpp
   qgssearchquerybuilder.cpp
@@ -162,7 +161,6 @@ SET (QGIS_APP_MOC_HDRS
   qgsoptions.h
   qgspastetransformations.h
   qgspluginmanager.h
-  qgspythondialog.h
   qgsprojectproperties.h
   qgsrasterlayerproperties.h
   qgssearchquerybuilder.h

src/app/qgisapp.cpp

@@ -197,7 +197,6 @@
 #include "qgsspatialitesourceselect.h"
 #endif
 
-#include "qgspythondialog.h"
 #include "qgspythonutils.h"
 
 #ifndef WIN32
@@ -329,7 +328,6 @@ QgisApp *QgisApp::smInstance = 0;
 QgisApp::QgisApp( QSplashScreen *splash, QWidget * parent, Qt::WFlags fl )
     : QMainWindow( parent, fl ),
     mSplash( splash ),
-    mPythonConsole( NULL ),
     mPythonUtils( NULL )
 #ifdef HAVE_QWT
     ,
@@ -507,7 +505,6 @@ QgisApp::~QgisApp()
   delete mMapTools.mAddIsland;
   delete mMapTools.mNodeTool;
 
-  delete mPythonConsole;
   delete mPythonUtils;
 
   deletePrintComposers();
@@ -1110,12 +1107,16 @@ void QgisApp::showPythonDialog()
   if ( !mPythonUtils || !mPythonUtils->isEnabled() )
     return;
 
-  if ( mPythonConsole == NULL )
-    mPythonConsole = new QgsPythonDialog( mQgisInterface, mPythonUtils );
-  mPythonConsole->show();
-  mPythonConsole->raise();
-  mPythonConsole->setWindowState( mPythonConsole->windowState() & ~Qt::WindowMinimized );
-  mPythonConsole->activateWindow();
+  bool res = mPythonUtils->runStringUnsafe(
+               "import qgis.console\n"
+               "qgis.console.show_console()\n", false );
+
+  if ( !res )
+  {
+    QString className, text;
+    mPythonUtils->getError( className, text );
+    QMessageBox::critical( this, tr( "Error" ), tr( "Failed to open Python console:" ) + "\n" + className + ": " + text );
+  }
 }
 
 void QgisApp::createActionGroups()

src/app/qgisapp.h

@@ -53,7 +53,6 @@ class QgsMapTip;
 class QgsMapTool;
 class QgsPoint;
 class QgsProviderRegistry;
-class QgsPythonDialog;
 class QgsPythonUtils;
 class QgsRasterLayer;
 class QgsRectangle;
@@ -1045,7 +1044,6 @@ class QgisApp : public QMainWindow
     //!flag to indicate that the previous screen mode was 'maximised'
     bool mPrevScreenModeMaximized;
 
-    QgsPythonDialog* mPythonConsole;
     QgsPythonUtils* mPythonUtils;
 
     static QgisApp *smInstance;