Preferences widget for tweaks

src/calibre/customize/builtins.py

@@ -793,9 +793,18 @@ class Plugins(PreferencesPlugin):
     name_order = 1
     config_widget = 'calibre.gui2.preferences.plugins'
 
+class Tweaks(PreferencesPlugin):
+    name = 'Tweaks'
+    gui_name = _('Tweaks')
+    category = 'Advanced'
+    gui_category = _('Advanced')
+    category_order = 5
+    name_order = 2
+    config_widget = 'calibre.gui2.preferences.tweaks'
+
 plugins += [LookAndFeel, Behavior, Columns, Toolbar, InputOptions,
         CommonOptions, OutputOptions, Adding, Saving, Sending, Email, Server,
-        Plugins]
+        Plugins, Tweaks]
 
 #}}}
 

src/calibre/gui2/preferences/tweaks.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
+
+__license__   = 'GPL v3'
+__copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
+__docformat__ = 'restructuredtext en'
+
+from calibre.gui2.preferences import ConfigWidgetBase, test_widget, AbortCommit
+from calibre.gui2.preferences.tweaks_ui import Ui_Form
+from calibre.gui2 import error_dialog
+from calibre.utils.config import read_raw_tweaks, write_tweaks
+
+
+class ConfigWidget(ConfigWidgetBase, Ui_Form):
+
+    def genesis(self, gui):
+        self.gui = gui
+        self.current_tweaks.textChanged.connect(self.changed)
+
+    def changed(self, *args):
+        self.changed_signal.emit()
+
+    def initialize(self):
+        deft, curt = read_raw_tweaks()
+        self.current_tweaks.blockSignals(True)
+        self.current_tweaks.setPlainText(curt.decode('utf-8'))
+        self.current_tweaks.blockSignals(False)
+
+        self.default_tweaks.setPlainText(deft.decode('utf-8'))
+
+    def restore_defaults(self):
+        ConfigWidgetBase.restore_defaults(self)
+        deft, curt = read_raw_tweaks()
+        self.current_tweaks.setPlainText(deft.decode('utf-8'))
+
+
+    def commit(self):
+        raw = unicode(self.current_tweaks.toPlainText()).encode('utf-8')
+        try:
+            exec raw
+        except:
+            import traceback
+            error_dialog(self, _('Invalid tweaks'),
+                    _('The tweaks you entered are invalid, try resetting the'
+                        ' tweaks to default and changing them one by one until'
+                        ' you find the invalid setting.'),
+                    det_msg=traceback.format_exc(), show=True)
+            raise AbortCommit('abort')
+        write_tweaks(raw)
+        return ConfigWidgetBase.commit(self)
+
+
+if __name__ == '__main__':
+    from PyQt4.Qt import QApplication
+    app = QApplication([])
+    test_widget('Advanced', 'Tweaks')
+

src/calibre/gui2/preferences/tweaks.ui

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Form</class>
+ <widget class="QWidget" name="Form">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>660</width>
+    <height>351</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QLabel" name="label_18">
+     <property name="text">
+      <string>Values for the tweaks are shown below. Edit them to change the behavior of calibre</string>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_6">
+     <property name="title">
+      <string>All available tweaks</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_11">
+      <item row="0" column="0">
+       <widget class="QPlainTextEdit" name="default_tweaks">
+        <property name="readOnly">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_7">
+     <property name="title">
+      <string>&amp;Current tweaks</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_10">
+      <item row="0" column="0">
+       <widget class="QPlainTextEdit" name="current_tweaks"/>
+      </item>
+     </layout>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>