RadonMetrics/RawMetricsDialog.py

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

# Copyright (c) 2015 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to show raw code metrics.
"""

from __future__ import unicode_literals

import os
import fnmatch

from PyQt5.QtCore import pyqtSlot, qVersion, Qt, QTimer
from PyQt5.QtWidgets import (
    QDialog, QDialogButtonBox, QAbstractButton, QMenu, QHeaderView,
    QTreeWidgetItem, QApplication
)

from .Ui_RawMetricsDialog import Ui_RawMetricsDialog

import Preferences
import Utilities


class RawMetricsDialog(QDialog, Ui_RawMetricsDialog):
    """
    Class implementing a dialog to show raw code metrics.
    """
    def __init__(self, radonService, parent=None):
        """
        Constructor
        
        @param radonService reference to the service
        @type RadonMetricsPlugin
        @param parent reference to the parent widget
        @type QWidget
        """
        super(RawMetricsDialog, self).__init__(parent)
        self.setupUi(self)
        self.setWindowFlags(Qt.Window)
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self.resultList.headerItem().setText(self.resultList.columnCount(), "")
        
        self.radonService = radonService
        self.radonService.metricsDone.connect(self.__processResult)
        self.radonService.metricsError.connect(self.__processError)
        self.radonService.batchFinished.connect(self.__batchFinished)
        
        self.cancelled = False
        
        self.__menu = QMenu(self)
        self.__menu.addAction(self.tr("Collapse all"),
                              self.__resultCollapse)
        self.__menu.addAction(self.tr("Expand all"), self.__resultExpand)
        self.resultList.setContextMenuPolicy(Qt.CustomContextMenu)
        self.resultList.customContextMenuRequested.connect(
            self.__showContextMenu)
        
        self.__fileList = []
        self.__project = None
        self.filterFrame.setVisible(False)
    
    def __resizeResultColumns(self):
        """
        Private method to resize the list columns.
        """
        self.resultList.header().resizeSections(QHeaderView.ResizeToContents)
        self.resultList.header().setStretchLastSection(True)
    
    def __createResultItem(self, filename, values):
        """
        Private slot to create a new item in the result list.
        
        @param parent parent of the new item
        @type QTreeWidget or QTreeWidgetItem
        @param values values to be displayed
        @type list
        @return the generated item
        @rtype QTreeWidgetItem
        """
        data = [filename]
        for value in values:
            try:
                data.append("{0:5}".format(int(value)))
            except ValueError:
                data.append(value)
        itm = QTreeWidgetItem(self.resultList, data)
        for col in range(1, 6):
            itm.setTextAlignment(col, Qt.Alignment(Qt.AlignRight))
        return itm
    
    def prepare(self, fileList, project):
        """
        Public method to prepare the dialog with a list of filenames.
        
        @param fileList list of filenames
        @type list of str
        @param project reference to the project object
        @type Project
        """
        self.__fileList = fileList[:]
        self.__project = project
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
        
        self.filterFrame.setVisible(True)
        
        self.__data = self.__project.getData(
            "OTHERTOOLSPARMS", "RadonCodeMetrics")
        if self.__data is None or "ExcludeFiles" not in self.__data:
            self.__data = {"ExcludeFiles": ""}
        self.excludeFilesEdit.setText(self.__data["ExcludeFiles"])
    
    def start(self, fn):
        """
        Public slot to start the code metrics determination.
        
        @param fn file or list of files or directory to show
                the code metrics for (string or list of strings)
        """
        self.cancelled = False
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        QApplication.processEvents()
        
        if isinstance(fn, list):
            self.files = fn
        elif os.path.isdir(fn):
            self.files = []
            extensions = set(Preferences.getPython("PythonExtensions") +
                             Preferences.getPython("Python3Extensions"))
            for ext in extensions:
                self.files.extend(
                    Utilities.direntries(fn, True, '*{0}'.format(ext), 0))
        else:
            self.files = [fn]
        self.files.sort()
        # check for missing files
        for f in self.files[:]:
            if not os.path.exists(f):
                self.files.remove(f)
        
        if len(self.files) > 0:
            self.checkProgress.setMaximum(len(self.files))
            self.checkProgress.setVisible(len(self.files) > 1)
            self.checkProgressLabel.setVisible(len(self.files) > 1)
            QApplication.processEvents()
            
            # now go through all the files
            self.progress = 0
            self.files.sort()
            if len(self.files) == 1:
                self.__batch = False
                self.rawMetrics()
            else:
                self.__batch = True
                self.rawMetricsBatch()
    
    def rawMetrics(self, codestring=''):
        """
        Public method to start a code metrics calculation for one Python file.
        
        The results are reported to the __processResult slot.
        
        @keyparam codestring optional sourcestring
        @type str
        """
        if not self.files:
            self.checkProgressLabel.setPath("")
            self.checkProgress.setMaximum(1)
            self.checkProgress.setValue(1)
            self.__finish()
            return
        
        self.filename = self.files.pop(0)
        self.checkProgress.setValue(self.progress)
        self.checkProgressLabel.setPath(self.filename)
        QApplication.processEvents()
        
        if self.cancelled:
            return
        
        try:
            self.source = Utilities.readEncodedFile(self.filename)[0]
            self.source = Utilities.normalizeCode(self.source)
        except (UnicodeError, IOError) as msg:
            # TODO: adjust this
            self.__createResultItem(
                self.filename, 1,
                "Error: {0}".format(str(msg)).rstrip())
            self.progress += 1
            # Continue with next file
            self.rawMetrics()
            return

        self.__finished = False
        self.radonService.rawMetrics(
            None, self.filename, self.source)

    def rawMetricsBatch(self):
        """
        Public method to start a code metrics calculation batch job.
        
        The results are reported to the __processResult slot.
        """
        self.__lastFileItem = None
        
        self.checkProgressLabel.setPath(self.tr("Preparing files..."))
        progress = 0
        
        argumentsList = []
        for filename in self.files:
            progress += 1
            self.checkProgress.setValue(progress)
            QApplication.processEvents()
            
            try:
                source = Utilities.readEncodedFile(filename)[0]
                source = Utilities.normalizeCode(source)
            except (UnicodeError, IOError) as msg:
                # TODO: adjust this
                self.__createResultItem(
                    filename, 1,
                    "Error: {0}".format(str(msg)).rstrip())
                continue
            
            argumentsList.append((filename, source))
        
        # reset the progress bar to the checked files
        self.checkProgress.setValue(self.progress)
        QApplication.processEvents()
        
        self.__finished = False
        self.radonService.rawMetricsBatch(argumentsList)
    
    def __batchFinished(self):
        """
        Private slot handling the completion of a batch job.
        """
        self.checkProgressLabel.setPath("")
        self.checkProgress.setMaximum(1)
        self.checkProgress.setValue(1)
        self.__finish()
    
    def __processError(self, fn, msg):
        # TODO: implement this
        print("Error", fn, msg)
    
    def __processResult(self, fn, result):
        """
        Private slot called after perfoming a code metrics calculation on one
        file.
        
        @param fn filename of the file
        @type str
        @param result result list
        @type list
        """
        if self.__finished:
            return
        
        # Check if it's the requested file, otherwise ignore signal if not
        # in batch mode
        if not self.__batch and fn != self.filename:
            return
        
        self.__createResultItem(fn, result)
        
        self.progress += 1
        
        self.checkProgress.setValue(self.progress)
        self.checkProgressLabel.setPath(fn)
        QApplication.processEvents()
        
        if not self.__batch:
            self.rawMetrics()

    def __finish(self):
        """
        Private slot called when the action or the user pressed the button.
        """
        if not self.__finished:
            self.__finished = True
            
            self.cancelled = True
            self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
            self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
            self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
            
            self.resultList.header().resizeSections(
                QHeaderView.ResizeToContents)
            self.resultList.header().setStretchLastSection(True)
            if qVersion() >= "5.0.0":
                self.resultList.header().setSectionResizeMode(
                    QHeaderView.Interactive)
            else:
                self.resultList.header().setResizeMode(QHeaderView.Interactive)
            
            self.checkProgress.setVisible(False)
            self.checkProgressLabel.setVisible(False)
    
    @pyqtSlot(QAbstractButton)
    def on_buttonBox_clicked(self, button):
        """
        Private slot called by a button of the button box clicked.
        
        @param button button that was clicked
        @type QAbstractButton
        """
        if button == self.buttonBox.button(QDialogButtonBox.Close):
            self.close()
        elif button == self.buttonBox.button(QDialogButtonBox.Cancel):
            if self.__batch:
                self.radonService.cancelRawMetricsBatch()
                QTimer.singleShot(1000, self.__finish)
            else:
                self.__finish()
    
    @pyqtSlot()
    def on_startButton_clicked(self):
        """
        Private slot to start a code metrics run.
        """
        fileList = self.__fileList[:]
        
        filterString = self.excludeFilesEdit.text()
        if "ExcludeFiles" not in self.__data or \
           filterString != self.__data["ExcludeFiles"]:
            self.__data["ExcludeFiles"] = filterString
            self.__project.setData(
                "OTHERTOOLSPARMS", "RadonCodeMetrics", self.__data)
        filterList = [f.strip() for f in filterString.split(",")
                      if f.strip()]
        if filterList:
            for filter in filterList:
                fileList = \
                    [f for f in fileList if not fnmatch.fnmatch(f, filter)]
        
        self.resultList.clear()
        self.cancelled = False
        self.start(fileList)
    
    def __showContextMenu(self, coord):
        """
        Private slot to show the context menu of the result list.
        
        @param coord position of the mouse pointer
        @type QPoint
        """
        if self.resultList.topLevelItemCount() > 0:
            self.__menu.popup(self.mapToGlobal(coord))
    
    def __resultCollapse(self):
        """
        Private slot to collapse all entries of the result list.
        """
        for index in range(self.resultList.topLevelItemCount()):
            self.resultList.topLevelItem(index).setExpanded(False)
    
    def __resultExpand(self):
        """
        Private slot to expand all entries of the result list.
        """
        for index in range(self.resultList.topLevelItemCount()):
            self.resultList.topLevelItem(index).setExpanded(True)