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# This file is part of the Frescobaldi project, http://www.frescobaldi.org/
#
# Copyright (c) 2008 - 2012 by Wilbert Berendsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# See http://www.gnu.org/licenses/ for more information.
"""
A Frescobaldi (LilyPond) document.
"""
from __future__ import unicode_literals
import os
from PyQt4.QtCore import QUrl
from PyQt4.QtGui import QPlainTextDocumentLayout, QTextDocument
import app
import util
import variables
import signals
class Document(QTextDocument):
urlChanged = signals.Signal()
closed = signals.Signal()
loaded = signals.Signal()
saved = signals.Signal()
def __init__(self, url=None, encoding=None):
super(Document, self).__init__()
self.setDocumentLayout(QPlainTextDocumentLayout(self))
self._encoding = encoding
self._url = url # avoid urlChanged on init
self.setUrl(url)
self.modificationChanged.connect(self.slotModificationChanged)
app.documents.append(self)
app.documentCreated(self)
self.load()
def slotModificationChanged(self):
app.documentModificationChanged(self)
def close(self):
app.documents.remove(self)
self.closed()
app.documentClosed(self)
def load(self):
"""Loads the current url.
Returns True if loading succeeded, False if an error occurred,
and None when the current url is empty or non-local.
Currently only local files are supported.
"""
fileName = self.url().toLocalFile()
if fileName:
try:
with open(fileName) as f:
data = f.read()
except (IOError, OSError):
return False # errors are caught in MainWindow.openUrl()
self.setPlainText(util.decode(data))
self.setModified(False)
self.loaded()
app.documentLoaded(self)
return True
def save(self):
"""Saves the document to the current url.
Returns True if saving succeeded, False if an error occurred,
and None when the current url is empty or non-local.
Currently only local files are supported.
"""
fileName = self.url().toLocalFile()
if fileName:
try:
with open(fileName, "w") as f:
f.write(self.encodedText())
except (IOError, OSError):
return False
self.setModified(False)
self.saved()
return True
def url(self):
return self._url
def setUrl(self, url):
""" Change the url for this document. """
changed = self._url != url
self._url = url or QUrl()
# number for nameless documents
if self._url.isEmpty():
nums = [0]
nums.extend(doc._num for doc in app.documents if doc is not self)
self._num = max(nums) + 1
else:
self._num = 0
if changed:
self.urlChanged()
app.documentUrlChanged(self)
def encoding(self):
return variables.get(self, "coding") or self._encoding
def setEncoding(self, encoding):
self._encoding = encoding
def encodedText(self):
"""Returns the text of the document encoded in the correct encoding.
Useful to save to a file.
"""
try:
return self.toPlainText().encode(self.encoding() or 'utf-8')
except (UnicodeError, LookupError):
return self.toPlainText().encode('utf-8')
def documentName(self):
""" Returns a suitable name for this document. """
if self._url.isEmpty():
if self._num == 1:
return _("Untitled")
else:
return _("Untitled ({num})").format(num=self._num)
else:
return os.path.basename(self._url.path())
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