Finish the implementation of delete files

src/calibre/gui2/tweak_book/boss.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+from __future__ import (unicode_literals, division, absolute_import,
+                        print_function)
+
+__license__ = 'GPL v3'
+__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
+
+import tempfile, shutil
+
+from PyQt4.Qt import QObject
+
+from calibre.gui2 import error_dialog
+from calibre.ptempfile import PersistentTemporaryDirectory
+from calibre.ebooks.oeb.polish.main import SUPPORTED
+from calibre.ebooks.oeb.polish.container import get_container, clone_container
+from calibre.gui2.tweak_book import set_current_container, current_container
+from calibre.gui2.tweak_book.undo import GlobalUndoHistory
+
+class Boss(QObject):
+
+    def __init__(self, parent=None):
+        QObject.__init__(self, parent)
+        self.global_undo = GlobalUndoHistory()
+        self.container_count = 0
+        self.tdir = None
+
+    def __call__(self, gui):
+        self.gui = gui
+        gui.file_list.delete_requested.connect(self.delete_requested)
+
+    def mkdtemp(self):
+        self.container_count += 1
+        return tempfile.mkdtemp(prefix='%05d-' % self.container_count, dir=self.tdir)
+
+    def check_dirtied(self):
+        # TODO: Implement this
+        return True
+
+    def open_book(self, path):
+        ext = path.rpartition('.')[-1].upper()
+        if ext not in SUPPORTED:
+            return error_dialog(self.gui, _('Unsupported format'),
+                _('Tweaking is only supported for books in the %s formats.'
+                  ' Convert your book to one of these formats first.') % _(' and ').join(sorted(SUPPORTED)),
+                show=True)
+
+        if not self.check_dirtied():
+            return
+
+        self.container_count = -1
+        if self.tdir:
+            shutil.rmtree(self.tdir, ignore_errors=True)
+        self.tdir = PersistentTemporaryDirectory()
+        self.gui.blocking_job('open_book', _('Opening book, please wait...'), self.book_opened, get_container, path, tdir=self.mkdtemp())
+
+    def book_opened(self, job):
+        if job.traceback is not None:
+            return error_dialog(self.gui, _('Failed to open book'),
+                    _('Failed to open book, click Show details for more information.'),
+                                det_msg=job.traceback, show=True)
+        container = job.result
+        set_current_container(container)
+        self.current_metadata = self.gui.current_metadata = container.mi
+        self.global_undo.open_book(container)
+        self.gui.update_window_title()
+        self.gui.file_list.build(container)
+
+    def add_savepoint(self, msg):
+        nc = clone_container(current_container(), self.mkdtemp())
+        self.global_undo.add_savepoint(nc, msg)
+        set_current_container(nc)
+
+    def delete_requested(self, spine_items, other_items):
+        if not self.check_dirtied():
+            return
+        self.add_savepoint(_('Delete files'))
+        c = current_container()
+        c.remove_from_spine(spine_items)
+        for name in other_items:
+            c.remove_item(name)
+        self.gui.file_list.delete_done(spine_items, other_items)
+
+

src/calibre/gui2/tweak_book/file_list.py

@@ -260,7 +260,7 @@ class FileList(QTreeWidget):
                         removals.append(child)
 
         for c in removals:
-            c.parent().removeChild(c.parent().indexOfChild(c))
+            c.parent().removeChild(c)
 
 class FileListWidget(QWidget):
 
@@ -274,6 +274,8 @@ class FileListWidget(QWidget):
         self.layout().setContentsMargins(0, 0, 0, 0)
         for x in ('delete_requested',):
             getattr(self.file_list, x).connect(getattr(self, x))
+        for x in ('delete_done',):
+            setattr(self, x, getattr(self.file_list, x))
 
     def build(self, container):
         self.file_list.build(container)

src/calibre/gui2/tweak_book/main.py

@@ -40,7 +40,7 @@ def main(args=sys.argv):
     sys.excepthook = main.unhandled_exception
     main.show()
     if len(args) > 1:
-        main.open_book(args[1])
+        main.boss.open_book(args[1])
     app.exec_()
 
 if __name__ == '__main__':

src/calibre/gui2/tweak_book/ui.py

@@ -6,23 +6,13 @@ from __future__ import (unicode_literals, division, absolute_import,
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 
-import shutil, tempfile
-
 from PyQt4.Qt import QDockWidget, Qt, QLabel, QIcon
 
-from calibre.ebooks.oeb.polish.container import get_container
-from calibre.ebooks.oeb.polish.main import SUPPORTED
-from calibre.ptempfile import PersistentTemporaryDirectory
-from calibre.gui2 import error_dialog
 from calibre.gui2.main_window import MainWindow
-from calibre.gui2.tweak_book import set_current_container, current_container
+from calibre.gui2.tweak_book import current_container
 from calibre.gui2.tweak_book.file_list import FileListWidget
 from calibre.gui2.tweak_book.job import BlockingJob
-from calibre.gui2.tweak_book.undo import GlobalUndoHistory
-
-def load_book(path_to_ebook, base_tdir):
-    tdir = tempfile.mkdtemp(dir=base_tdir)
-    return get_container(path_to_ebook, tdir=tdir)
+from calibre.gui2.tweak_book.boss import Boss
 
 class Main(MainWindow):
 
@@ -30,13 +20,13 @@ class Main(MainWindow):
 
     def __init__(self, opts):
         MainWindow.__init__(self, opts, disable_automatic_gc=True)
+        self.boss = Boss(self)
         self.setWindowTitle(self.APP_NAME)
         self.setWindowIcon(QIcon(I('tweak.png')))
         self.opts = opts
-        self.tdir = None
         self.path_to_ebook = None
         self.container = None
-        self.global_undo = GlobalUndoHistory()
+        self.current_metadata = None
         self.blocking_job = BlockingJob(self)
 
         self.file_list_dock = d = QDockWidget(_('&Files Browser'), self)
@@ -49,37 +39,11 @@ class Main(MainWindow):
         self.l = QLabel('Placeholder')
 
         self.setCentralWidget(self.l)
+        self.boss(self)
 
     def resizeEvent(self, ev):
         self.blocking_job.resize(ev.size())
         return super(Main, self).resizeEvent(ev)
 
-    def open_book(self, path):
-        ext = path.rpartition('.')[-1].upper()
-        if ext not in SUPPORTED:
-            return error_dialog(self, _('Unsupported format'),
-                _('Tweaking is only supported for books in the %s formats.'
-                  ' Convert your book to one of these formats first.') % _(' and ').join(sorted(SUPPORTED)),
-                show=True)
-
-        # TODO: Handle already open, dirtied book
-
-        if self.tdir:
-            shutil.rmtree(self.tdir, ignore_errors=True)
-        self.tdir = PersistentTemporaryDirectory()
-        self.blocking_job('open_book', _('Opening book, please wait...'), self.book_opened, load_book, path, self.tdir)
-
-    def book_opened(self, job):
-        if job.traceback is not None:
-            return error_dialog(self, _('Failed to open book'),
-                    _('Failed to open book, click Show details for more information.'),
-                                det_msg=job.traceback, show=True)
-        container = job.result
-        set_current_container(container)
-        self.current_metadata = container.mi
-        self.global_undo.open_book(container)
-        self.update_window_title()
-        self.file_list.build(container)
-
     def update_window_title(self):
         self.setWindowTitle(self.current_metadata.title + ' [%s] - %s' %(current_container().book_type.upper(), self.APP_NAME))

src/calibre/gui2/tweak_book/undo.py

@@ -6,18 +6,51 @@ from __future__ import (unicode_literals, division, absolute_import,
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 
+import shutil
+
+def cleanup(containers):
+    for container in containers:
+        try:
+            shutil.rmtree(container.root, ignore_errors=True)
+        except:
+            pass
 
 class State(object):
 
     def __init__(self, container):
         self.container = container
-        self.operation = None
+        self.message = None
 
 class GlobalUndoHistory(object):
 
     def __init__(self):
         self.states = []
+        self.pos = 0
+
+    @property
+    def current_container(self):
+        return self.states[self.pos].container
 
     def open_book(self, container):
         self.states = [State(container)]
+        self.pos = 0
+
+    def add_savepoint(self, new_container, message):
+        self.states[self.pos].message = message
+        extra = self.states[self.pos+1:]
+        cleanup(extra)
+        self.states = self.states[:self.pos+1]
+        self.states.append(State(new_container))
+        self.pos += 1
+
+    def undo(self):
+        if self.pos > 0:
+            self.pos -= 1
+            return self.current_container
+
+    def redo(self):
+        if self.pos < len(self.states) - 1:
+            self.pos += 1
+            return self.current_container
+