Plugins/VcsPlugins/vcsMercurial/HgLogBrowserDialog.py

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

# Copyright (c) 2010 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to browse the log history.
"""

import os

from PyQt4.QtCore import pyqtSlot, SIGNAL, Qt, QDate, QProcess, QTimer, QRegExp
from PyQt4.QtGui import QDialog, QDialogButtonBox, QHeaderView, QTreeWidgetItem, \
    QApplication, QMessageBox, QCursor, QWidget, QLineEdit

from .Ui_HgLogBrowserDialog import Ui_HgLogBrowserDialog
from .HgDiffDialog import HgDiffDialog

import UI.PixmapCache

import Preferences

class HgLogBrowserDialog(QDialog, Ui_HgLogBrowserDialog):
    """
    Class implementing a dialog to browse the log history.
    """
    def __init__(self, vcs, parent = None):
        """
        Constructor
        
        @param vcs reference to the vcs object
        @param parent parent widget (QWidget)
        """
        QDialog.__init__(self, parent)
        self.setupUi(self)
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self.filesTree.headerItem().setText(self.filesTree.columnCount(), "")
        self.filesTree.header().setSortIndicator(0, Qt.AscendingOrder)
        
        self.vcs = vcs
        
        self.__maxDate = QDate()
        self.__minDate = QDate()
        self.__filterLogsEnabled = True
        
        self.fromDate.setDisplayFormat("yyyy-MM-dd")
        self.toDate.setDisplayFormat("yyyy-MM-dd")
        self.fromDate.setDate(QDate.currentDate())
        self.toDate.setDate(QDate.currentDate())
        self.fieldCombo.setCurrentIndex(self.fieldCombo.findText(self.trUtf8("Message")))
        self.clearRxEditButton.setIcon(UI.PixmapCache.getIcon("clearLeft.png"))
        self.limitSpinBox.setValue(self.vcs.getPlugin().getPreferences("LogLimit"))
        self.stopCheckBox.setChecked(self.vcs.getPlugin().getPreferences("StopLogOnCopy"))
        
        self.__messageRole = Qt.UserRole
        self.__changesRole = Qt.UserRole + 1
        
        self.process = QProcess()
        self.connect(self.process, SIGNAL('finished(int, QProcess::ExitStatus)'),
            self.__procFinished)
        self.connect(self.process, SIGNAL('readyReadStandardOutput()'),
            self.__readStdout)
        self.connect(self.process, SIGNAL('readyReadStandardError()'),
            self.__readStderr)
        
        self.flags = {
            'A' : self.trUtf8('Added'),
            'D' : self.trUtf8('Deleted'),
            'M' : self.trUtf8('Modified'), 
        }
        
        self.buf = []        # buffer for stdout
        self.diff = None
        self.__started = False
        self.__lastRev = 0
    
    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 __resizeColumnsLog(self):
        """
        Private method to resize the log tree columns.
        """
        self.logTree.header().resizeSections(QHeaderView.ResizeToContents)
        self.logTree.header().setStretchLastSection(True)
    
    def __resortLog(self):
        """
        Private method to resort the log tree.
        """
        self.logTree.sortItems(self.logTree.sortColumn(), 
            self.logTree.header().sortIndicatorOrder())
    
    def __resizeColumnsFiles(self):
        """
        Private method to resize the changed files tree columns.
        """
        self.filesTree.header().resizeSections(QHeaderView.ResizeToContents)
        self.filesTree.header().setStretchLastSection(True)
    
    def __resortFiles(self):
        """
        Private method to resort the changed files tree.
        """
        sortColumn = self.filesTree.sortColumn()
        self.filesTree.sortItems(1, 
            self.filesTree.header().sortIndicatorOrder())
        self.filesTree.sortItems(sortColumn, 
            self.filesTree.header().sortIndicatorOrder())
    
    def __generateLogItem(self, author, date, message, revision, changedPaths):
        """
        Private method to generate a log tree entry.
        
        @param author author info (string)
        @param date date info (string)
        @param message text of the log message (list of strings)
        @param revision revision info (string)
        @param changedPaths list of dictionary objects containing
            info about the changed files/directories 
        @return reference to the generated item (QTreeWidgetItem)
        """
        msg = []
        for line in message:
            msg.append(line.strip())
        
        rev, node = revision.split(":")
        itm = QTreeWidgetItem(self.logTree, [
            "{0:>7}:{1}".format(rev, node), 
            author, 
            date, 
            " ".join(msg), 
        ])
        
        itm.setData(0, self.__messageRole, message)
        itm.setData(0, self.__changesRole, changedPaths)
        
        itm.setTextAlignment(0, Qt.AlignLeft)
        itm.setTextAlignment(1, Qt.AlignLeft)
        itm.setTextAlignment(2, Qt.AlignLeft)
        itm.setTextAlignment(3, Qt.AlignLeft)
        itm.setTextAlignment(4, Qt.AlignLeft)
        
        try:
            self.__lastRev = int(revision.split(":")[0])
        except ValueError:
            self.__lastRev = 0
        
        return itm
    
    def __generateFileItem(self, action, path):
        """
        Private method to generate a changed files tree entry.
        
        @param action indicator for the change action ("A", "D" or "M")
        @param path path of the file in the repository (string)
        @return reference to the generated item (QTreeWidgetItem)
        """
        itm = QTreeWidgetItem(self.filesTree, [
            self.flags[action], 
            path, 
        ])
        
        return itm
    
    def __getLogEntries(self, startRev = None):
        """
        Private method to retrieve log entries from the repository.
        
        @param startRev revision number to start from (integer, string)
        """
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        QApplication.processEvents()
        
        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
        QApplication.processEvents()
        
        self.intercept = False
        self.process.kill()
        
        self.buf = []
        self.cancelled = False
        self.errors.clear()
        
        self.inputGroup.show()
        
        args = []
        args.append('log')
        self.vcs.addArguments(args, self.vcs.options['global'])
        self.vcs.addArguments(args, self.vcs.options['log'])
        args.append('--verbose')
        args.append('--limit')
        args.append(str(self.limitSpinBox.value()))
        if startRev is not None:
            args.append('--rev')
            args.append('{0}:0'.format(startRev))
        if not self.stopCheckBox.isChecked():
            args.append('--follow')
        args.append('--template')
        args.append("change|{rev}:{node|short}\n"
                    "user|{author}\n"
                    "date|{date|isodate}\n"
                    "description|{desc}\n"
                    "file_adds|{file_adds}\n"
                    "files_mods|{file_mods}\n"
                    "file_dels|{file_dels}\n"
                    "@@@\n")
        if self.fname != "." or self.dname != self.repodir:
            args.append(self.filename)
        
        self.process.setWorkingDirectory(self.repodir)
        
        self.process.start('hg', args)
        procStarted = self.process.waitForStarted()
        if not procStarted:
            self.inputGroup.setEnabled(False)
            QMessageBox.critical(None,
                self.trUtf8('Process Generation Error'),
                self.trUtf8(
                    'The process {0} could not be started. '
                    'Ensure, that it is in the search path.'
                ).format('hg'))
    
    def start(self, fn):
        """
        Public slot to start the svn log command.
        
        @param fn filename to show the log for (string)
        """
        self.errorGroup.hide()
        QApplication.processEvents()
        
        self.filename = fn
        self.dname, self.fname = self.vcs.splitPath(fn)
        
        # find the root of the repo
        self.repodir = self.dname
        while not os.path.isdir(os.path.join(self.repodir, self.vcs.adminDir)):
            self.repodir = os.path.dirname(self.repodir)
            if self.repodir == os.sep:
                return
        
        self.activateWindow()
        self.raise_()
        
        self.logTree.clear()
        self.__started = True
        self.__getLogEntries()
    
    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)
        """
        self.__processBuffer()
        self.__finish()
    
    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)
        
        QApplication.restoreOverrideCursor()
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
        
        self.inputGroup.setEnabled(False)
        self.inputGroup.hide()
    
    def __processBuffer(self):
        """
        Private method to process the buffered output of the svn log command.
        """
        noEntries = 0
        log = {"message" : []}
        changedPaths = []
        for s in self.buf:
            if s != "@@@\n":
                try:
                    key, value = s.split("|", 1)
                except ValueError:
                    key = ""
                    value = s
                if key == "change":
                    log["revision"] = value.strip()
                elif key == "user":
                    log["author"] = value.strip()
                elif key == "date":
                    log["date"] = " ".join(value.strip().split()[:2])
                elif key == "description":
                    log["message"].append(value.strip())
                elif key == "file_adds":
                    if value.strip():
                        for f in value.strip().split():
                            changedPaths.append({\
                                "action" : "A", 
                                "path"   : f, 
                            })
                elif key == "files_mods":
                    if value.strip():
                        for f in value.strip().split():
                            changedPaths.append({\
                                "action" : "M", 
                                "path"   : f, 
                            })
                elif key == "file_dels":
                    if value.strip():
                        for f in value.strip().split():
                            changedPaths.append({\
                                "action" : "D", 
                                "path"   : f, 
                            })
                else:
                    if value.strip():
                        log["message"].append(value.strip())
            else:
                if len(log) > 1:
                    self.__generateLogItem(log["author"], log["date"], 
                        log["message"], log["revision"], changedPaths)
                    dt = QDate.fromString(log["date"], Qt.ISODate)
                    if not self.__maxDate.isValid() and not self.__minDate.isValid():
                        self.__maxDate = dt
                        self.__minDate = dt
                    else:
                        if self.__maxDate < dt:
                            self.__maxDate = dt
                        if self.__minDate > dt:
                            self.__minDate = dt
                    noEntries += 1
                    log = {"message" : []}
                    changedPaths = []
        
        self.logTree.doItemsLayout()
        self.__resizeColumnsLog()
        self.__resortLog()
        
        if self.__started:
            self.logTree.setCurrentItem(self.logTree.topLevelItem(0))
            self.__started = False
        
        if noEntries < self.limitSpinBox.value() and not self.cancelled:
            self.nextButton.setEnabled(False)
            self.limitSpinBox.setEnabled(False)
        
        self.__filterLogsEnabled = False
        self.fromDate.setMinimumDate(self.__minDate)
        self.fromDate.setMaximumDate(self.__maxDate)
        self.fromDate.setDate(self.__minDate)
        self.toDate.setMinimumDate(self.__minDate)
        self.toDate.setMaximumDate(self.__maxDate)
        self.toDate.setDate(self.__maxDate)
        self.__filterLogsEnabled = True
        self.__filterLogs()
    
    def __readStdout(self):
        """
        Private slot to handle the readyReadStandardOutput signal. 
        
        It reads the output of the process and inserts it into a buffer.
        """
        self.process.setReadChannel(QProcess.StandardOutput)
        
        while self.process.canReadLine():
            line = str(self.process.readLine(), 
                        Preferences.getSystem("IOEncoding"), 
                        'replace')
            self.buf.append(line)
    
    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()
    
    def __diffRevisions(self, rev1, rev2):
        """
        Private method to do a diff of two revisions.
        
        @param rev1 first revision number (integer)
        @param rev2 second revision number (integer)
        """
        if self.diff:
            self.diff.close()
            del self.diff
        self.diff = HgDiffDialog(self.vcs)
        self.diff.show()
        self.diff.start(self.filename, [rev1, rev2])
    
    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.cancelled = True
            self.__finish()
    
    @pyqtSlot(QTreeWidgetItem, QTreeWidgetItem)
    def on_logTree_currentItemChanged(self, current, previous):
        """
        Private slot called, when the current item of the log tree changes.
        
        @param current reference to the new current item (QTreeWidgetItem)
        @param previous reference to the old current item (QTreeWidgetItem)
        """
        self.messageEdit.clear()
        for line in current.data(0, self.__messageRole):
            self.messageEdit.append(line.strip())
        
        self.filesTree.clear()
        changes = current.data(0, self.__changesRole)
        if len(changes) > 0:
            for change in changes:
                self.__generateFileItem(change["action"], change["path"])
            self.__resizeColumnsFiles()
            self.__resortFiles()
        
        self.diffPreviousButton.setEnabled(
            current != self.logTree.topLevelItem(self.logTree.topLevelItemCount() - 1))
    
    @pyqtSlot()
    def on_logTree_itemSelectionChanged(self):
        """
        Private slot called, when the selection has changed.
        """
        self.diffRevisionsButton.setEnabled(len(self.logTree.selectedItems()) == 2)
    
    @pyqtSlot()
    def on_nextButton_clicked(self):
        """
        Private slot to handle the Next button.
        """
        if self.__lastRev > 1:
            self.__getLogEntries(self.__lastRev - 1)
    
    @pyqtSlot()
    def on_diffPreviousButton_clicked(self):
        """
        Private slot to handle the Diff to Previous button.
        """
        itm = self.logTree.currentItem()
        if itm is None:
            self.diffPreviousButton.setEnabled(False)
            return
        rev2 = int(itm.text(0).split(":")[0])
        
        itm = self.logTree.topLevelItem(self.logTree.indexOfTopLevelItem(itm) + 1)
        if itm is None:
            self.diffPreviousButton.setEnabled(False)
            return
        rev1 = int(itm.text(0).split(":")[0])
        
        self.__diffRevisions(rev1, rev2)
    
    @pyqtSlot()
    def on_diffRevisionsButton_clicked(self):
        """
        Private slot to handle the Compare Revisions button.
        """
        items = self.logTree.selectedItems()
        if len(items) != 2:
            self.diffRevisionsButton.setEnabled(False)
            return
        
        rev2 = int(items[0].text(0).split(":")[0])
        rev1 = int(items[1].text(0).split(":")[0])
        
        self.__diffRevisions(min(rev1, rev2), max(rev1, rev2))
    
    @pyqtSlot(QDate)
    def on_fromDate_dateChanged(self, date):
        """
        Private slot called, when the from date changes.
        
        @param date new date (QDate)
        """
        self.__filterLogs()
    
    @pyqtSlot(QDate)
    def on_toDate_dateChanged(self, date):
        """
        Private slot called, when the from date changes.
        
        @param date new date (QDate)
        """
        self.__filterLogs()
    
    @pyqtSlot(str)
    def on_fieldCombo_activated(self, txt):
        """
        Private slot called, when a new filter field is selected.
        
        @param txt text of the selected field (string)
        """
        self.__filterLogs()
    
    @pyqtSlot(str)
    def on_rxEdit_textChanged(self, txt):
        """
        Private slot called, when a filter expression is entered.
        
        @param txt filter expression (string)
        """
        self.__filterLogs()
    
    def __filterLogs(self):
        """
        Private method to filter the log entries.
        """
        if self.__filterLogsEnabled:
            from_ = self.fromDate.date().toString("yyyy-MM-dd")
            to_ = self.toDate.date().addDays(1).toString("yyyy-MM-dd")
            txt = self.fieldCombo.currentText()
            if txt == self.trUtf8("Author"):
                fieldIndex = 1
                searchRx = QRegExp(self.rxEdit.text(), Qt.CaseInsensitive)
            elif txt == self.trUtf8("Revision"):
                fieldIndex = 0
                txt = self.rxEdit.text()
                if txt.startswith("^"):
                    searchRx = QRegExp("^\s*%s" % txt[1:], Qt.CaseInsensitive)
                else:
                    searchRx = QRegExp(txt, Qt.CaseInsensitive)
            else:
                fieldIndex = 3
                searchRx = QRegExp(self.rxEdit.text(), Qt.CaseInsensitive)
            
            currentItem = self.logTree.currentItem()
            for topIndex in range(self.logTree.topLevelItemCount()):
                topItem = self.logTree.topLevelItem(topIndex)
                if topItem.text(2) <= to_ and topItem.text(2) >= from_ and \
                   searchRx.indexIn(topItem.text(fieldIndex)) > -1:
                    topItem.setHidden(False)
                    if topItem is currentItem:
                        self.on_logTree_currentItemChanged(topItem, None)
                else:
                    topItem.setHidden(True)
                    if topItem is currentItem:
                        self.messageEdit.clear()
                        self.filesTree.clear()
    
    @pyqtSlot()
    def on_clearRxEditButton_clicked(self):
        """
        Private slot called by a click of the clear RX edit button.
        """
        self.rxEdit.clear()
    
    @pyqtSlot(bool)
    def on_stopCheckBox_clicked(self, checked):
        """
        Private slot called, when the stop on copy/move checkbox is clicked
        """
        self.vcs.getPlugin().setPreferences("StopLogOnCopy", 
                                            self.stopCheckBox.isChecked())
        self.nextButton.setEnabled(True)
        self.limitSpinBox.setEnabled(True)
    
    def on_passwordCheckBox_toggled(self, isOn):
        """
        Private slot to handle the password checkbox toggled.
        
        @param isOn flag indicating the status of the check box (boolean)
        """
        if isOn:
            self.input.setEchoMode(QLineEdit.Password)
        else:
            self.input.setEchoMode(QLineEdit.Normal)
    
    @pyqtSlot()
    def on_sendButton_clicked(self):
        """
        Private slot to send the input to the merurial process.
        """
        input = self.input.text()
        input += os.linesep
        
        if self.passwordCheckBox.isChecked():
            self.errors.insertPlainText(os.linesep)
            self.errors.ensureCursorVisible()
        else:
            self.errors.insertPlainText(input)
            self.errors.ensureCursorVisible()
        self.errorGroup.show()
        
        self.process.write(input)
        
        self.passwordCheckBox.setChecked(False)
        self.input.clear()
    
    def on_input_returnPressed(self):
        """
        Private slot to handle the press of the return key in the input field.
        """
        self.intercept = True
        self.on_sendButton_clicked()
    
    def keyPressEvent(self, evt):
        """
        Protected slot to handle a key press event.
        
        @param evt the key press event (QKeyEvent)
        """
        if self.intercept:
            self.intercept = False
            evt.accept()
            return
        QWidget.keyPressEvent(self, evt)