From f3a660fec3b3fb98a977c5e321324335569d7c21 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 4 Nov 2013 15:59:58 +0530
Subject: [PATCH] Closing of editor tabs

---
 src/calibre/gui2/tweak_book/boss.py          | 21 +++++++++++++++++++-
 src/calibre/gui2/tweak_book/editor/widget.py |  7 +++++++
 src/calibre/gui2/tweak_book/ui.py            | 13 ++++++++++++
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index 61ed929be8..469691b141 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -50,6 +50,7 @@ class Boss(QObject):
         fl.rename_requested.connect(self.rename_requested)
         fl.edit_file.connect(self.edit_file_requested)
         self.gui.central.current_editor_changed.connect(self.apply_current_editor_state)
+        self.gui.central.close_requested.connect(self.editor_close_requested)
 
     def mkdtemp(self, prefix=''):
         self.container_count += 1
@@ -271,7 +272,25 @@ class Boss(QObject):
             actions['editor-undo'].setEnabled(ed.undo_available)
             actions['editor-redo'].setEnabled(ed.redo_available)
             actions['editor-save'].setEnabled(ed.is_modified)
-        self.gui.keyboard.set_mode(ed.syntax)
+            self.gui.keyboard.set_mode(ed.syntax)
+        else:
+            self.gui.keyboard.set_mode('other')
+
+    def editor_close_requested(self, editor):
+        name = None
+        for n, ed in self.editors.iteritems():
+            if ed is editor:
+                name = n
+        if not name:
+            return
+        if editor.is_modified:
+            if not question_dialog(self.gui, _('Unsaved changes'), _(
+                'There are unsaved changes in %s. Are you sure you want to close'
+                ' this editor?') % name):
+                return
+        self.editors.pop(name)
+        self.gui.central.close_editor(editor)
+        editor.break_cycles()
 
     def do_editor_save(self):
         ed = self.gui.central.current_editor
diff --git a/src/calibre/gui2/tweak_book/editor/widget.py b/src/calibre/gui2/tweak_book/editor/widget.py
index 0619f479f8..a2a034d369 100644
--- a/src/calibre/gui2/tweak_book/editor/widget.py
+++ b/src/calibre/gui2/tweak_book/editor/widget.py
@@ -71,6 +71,13 @@ class Editor(QMainWindow):
         b.addAction(actions['editor-undo'])
         b.addAction(actions['editor-redo'])
 
+    def break_cycles(self):
+        self.modification_state_changed.disconnect()
+        self.undo_redo_state_changed.disconnect()
+        self.editor.undoAvailable.disconnect()
+        self.editor.redoAvailable.disconnect()
+        self.editor.modificationChanged.disconnect()
+        self.editor.setPlainText('')
 
 def launch_editor(path_to_edit, path_is_raw=False, syntax='html'):
     if path_is_raw:
diff --git a/src/calibre/gui2/tweak_book/ui.py b/src/calibre/gui2/tweak_book/ui.py
index 9bbec5bc39..b133cc4c41 100644
--- a/src/calibre/gui2/tweak_book/ui.py
+++ b/src/calibre/gui2/tweak_book/ui.py
@@ -22,6 +22,7 @@ class Central(QStackedWidget):
     ' The central widget, hosts the editors '
 
     current_editor_changed = pyqtSignal()
+    close_requested = pyqtSignal(object)
 
     def __init__(self, parent=None):
         QStackedWidget.__init__(self, parent)
@@ -50,6 +51,11 @@ class Central(QStackedWidget):
         else:
             self.modified_icon = QIcon(I('modified.png'))
         self.editor_tabs.currentChanged.connect(self.current_editor_changed)
+        self.editor_tabs.tabCloseRequested.connect(self._close_requested)
+
+    def _close_requested(self, index):
+        editor = self.editor_tabs.widget(index)
+        self.close_requested.emit(editor)
 
     def add_editor(self, name, editor):
         fname = name.rpartition('/')[2]
@@ -61,6 +67,13 @@ class Central(QStackedWidget):
         self.setCurrentIndex(1)
         self.editor_tabs.setCurrentWidget(editor)
 
+    def close_editor(self, editor):
+        for i in xrange(self.editor_tabs.count()):
+            if self.editor_tabs.widget(i) is editor:
+                self.editor_tabs.removeTab(i)
+                return True
+        return False
+
     def editor_modified(self, *args):
         tb = self.editor_tabs.tabBar()
         for i in xrange(self.editor_tabs.count()):