Plugins/VcsPlugins/vcsSubversion/SvnPropListDialog.py

# -*- coding: utf-8 -*-

# Copyright (c) 2003 - 2013 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to show the output of the svn proplist command
process.
"""

from PyQt4.QtCore import QTimer, QProcess, QProcessEnvironment, QRegExp, Qt
from PyQt4.QtGui import QWidget, QHeaderView, QDialogButtonBox, QTreeWidgetItem

from E5Gui import E5MessageBox

from .Ui_SvnPropListDialog import Ui_SvnPropListDialog

import Preferences


class SvnPropListDialog(QWidget, Ui_SvnPropListDialog):
    """
    Class implementing a dialog to show the output of the svn proplist command
    process.
    """
    def __init__(self, vcs, parent=None):
        """
        Constructor
        
        @param vcs reference to the vcs object
        @param parent parent widget (QWidget)
        """
        super().__init__(parent)
        self.setupUi(self)
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self.process = QProcess()
        env = QProcessEnvironment.systemEnvironment()
        env.insert("LANG", "C")
        self.process.setProcessEnvironment(env)
        self.vcs = vcs
        
        self.propsList.headerItem().setText(self.propsList.columnCount(), "")
        self.propsList.header().setSortIndicator(0, Qt.AscendingOrder)
        
        self.process.finished.connect(self.__procFinished)
        self.process.readyReadStandardOutput.connect(self.__readStdout)
        self.process.readyReadStandardError.connect(self.__readStderr)
        
        self.rx_path = QRegExp(r"Properties on '([^']+)':\s*")
        self.rx_prop = QRegExp(r"  (.*) *: *(.*)[\r\n]")
        self.lastPath = None
        self.lastProp = None
        self.propBuffer = ""
        
    def __resort(self):
        """
        Private method to resort the tree.
        """
        self.propsList.sortItems(self.propsList.sortColumn(),
            self.propsList.header().sortIndicatorOrder())
        
    def __resizeColumns(self):
        """
        Private method to resize the list columns.
        """
        self.propsList.header().resizeSections(QHeaderView.ResizeToContents)
        self.propsList.header().setStretchLastSection(True)
        
    def __generateItem(self, path, propName, propValue):
        """
        Private method to generate a properties item in the properties list.
        
        @param path file/directory name the property applies to (string)
        @param propName name of the property (string)
        @param propValue value of the property (string)
        """
        QTreeWidgetItem(self.propsList, [path, propName, propValue.strip()])
        
    def closeEvent(self, e):
        """
        Private slot implementing a close event handler.
        
        @param e close event (QCloseEvent)
        """
        if self.process is not None and \
           self.process.state() != QProcess.NotRunning:
            self.process.terminate()
            QTimer.singleShot(2000, self.process.kill)
            self.process.waitForFinished(3000)
        
        e.accept()
        
    def start(self, fn, recursive=False):
        """
        Public slot to start the svn status command.
        
        @param fn filename(s) (string or list of string)
        @param recursive flag indicating a recursive list is requested
        """
        self.errorGroup.hide()
        
        self.process.kill()
        
        args = []
        args.append('proplist')
        self.vcs.addArguments(args, self.vcs.options['global'])
        args.append('--verbose')
        if recursive:
            args.append('--recursive')
        if isinstance(fn, list):
            dname, fnames = self.vcs.splitPathList(fn)
            self.vcs.addArguments(args, fnames)
        else:
            dname, fname = self.vcs.splitPath(fn)
            args.append(fname)
        
        self.process.setWorkingDirectory(dname)
        
        self.process.start('svn', args)
        procStarted = self.process.waitForStarted(5000)
        if not procStarted:
            E5MessageBox.critical(self,
                self.trUtf8('Process Generation Error'),
                self.trUtf8(
                    'The process {0} could not be started. '
                    'Ensure, that it is in the search path.'
                ).format('svn'))
        
    def __finish(self):
        """
        Private slot called when the process finished or the user pressed the
        button.
        """
        if self.process is not None and \
           self.process.state() != QProcess.NotRunning:
            self.process.terminate()
            QTimer.singleShot(2000, self.process.kill)
            self.process.waitForFinished(3000)
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
        
        self.process = None
        if self.lastProp:
            self.__generateItem(self.lastPath, self.lastProp, self.propBuffer)
        
        self.__resort()
        self.__resizeColumns()
        
    def on_buttonBox_clicked(self, button):
        """
        Private slot called by a button of the button box clicked.
        
        @param button button that was clicked (QAbstractButton)
        """
        if button == self.buttonBox.button(QDialogButtonBox.Close):
            self.close()
        elif button == self.buttonBox.button(QDialogButtonBox.Cancel):
            self.__finish()
        
    def __procFinished(self, exitCode, exitStatus):
        """
        Private slot connected to the finished signal.
        
        @param exitCode exit code of the process (integer)
        @param exitStatus exit status of the process (QProcess.ExitStatus)
        """
        if self.lastPath is None:
            self.__generateItem('', 'None', '')
        
        self.__finish()
        
    def __readStdout(self):
        """
        Private slot to handle the readyReadStandardOutput signal.
        
        It reads the output of the process, formats it and inserts it into
        the contents pane.
        """
        self.process.setReadChannel(QProcess.StandardOutput)
        
        while self.process.canReadLine():
            s = str(self.process.readLine(),
                     Preferences.getSystem("IOEncoding"),
                     'replace')
            if self.rx_path.exactMatch(s):
                if self.lastProp:
                    self.__generateItem(
                        self.lastPath, self.lastProp, self.propBuffer)
                self.lastPath = self.rx_path.cap(1)
                self.lastProp = None
                self.propBuffer = ""
            elif self.rx_prop.exactMatch(s):
                if self.lastProp:
                    self.__generateItem(
                        self.lastPath, self.lastProp, self.propBuffer)
                self.lastProp = self.rx_prop.cap(1)
                self.propBuffer = self.rx_prop.cap(2)
            else:
                self.propBuffer += ' '
                self.propBuffer += s
        
    def __readStderr(self):
        """
        Private slot to handle the readyReadStandardError signal.
        
        It reads the error output of the process and inserts it into the
        error pane.
        """
        if self.process is not None:
            self.errorGroup.show()
            s = str(self.process.readAllStandardError(),
                     Preferences.getSystem("IOEncoding"),
                     'replace')
            self.errors.insertPlainText(s)
            self.errors.ensureCursorVisible()