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#****************************************************************************
# option.py, provides classes to read and set user preferences
#
# Copyright (C) 2014, Douglas W. Bell
#
# This is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License, either Version 2 or any later
# version.  This program is distributed in the hope that it will be useful,
# but WITTHOUT ANY WARRANTY.  See the included LICENSE file for details.
#*****************************************************************************

import sys
import os.path

class Option:
    """Stores and retrieves string options.
    """
    def __init__(self, baseFileName, keySpaces=20):
        self.path = ''
        if baseFileName:
            if sys.platform.startswith('win'):
                fileName = '{0}.ini'.format(baseFileName)
                userPath = os.environ.get('APPDATA', '')
                if userPath:
                    userPath = os.path.join(userPath, 'bellz', baseFileName)
            else:
                fileName = '.{0}'.format(baseFileName)
                userPath = os.environ.get('HOME', '')
            self.path = os.path.join(userPath, fileName)
            if not os.path.exists(self.path):
                modPath = os.path.abspath(sys.path[0])
                if modPath.endswith('.zip') or modPath.endswith('.exe'):
                    modPath = os.path.dirname(modPath)  # for py2exe/cx_freeze
                self.path = os.path.join(modPath, fileName)
                if not os.access(self.path, os.W_OK):
                    self.path = os.path.join(userPath, fileName)
                    if not os.path.exists(userPath):
                        try:
                            os.makedirs(userPath)
                        except OSError:
                            print('Error - could not write to config dir')
                            self.path = ''
        self.keySpaces = keySpaces
        self.dfltDict = {}
        self.userDict = {}
        self.dictList = (self.userDict, self.dfltDict)
        self.chgList = []

    def loadAll(self, defaultList):
        """Reads defaultList & file, writes file if required
           return true if file read.
        """
        self.loadSet(defaultList, self.dfltDict)
        if self.path:
            try:
                with open(self.path, 'r', encoding='utf-8') as f:
                    self.loadSet(f.readlines(), self.userDict)
                    return True
            except IOError:
                try:
                    with open(self.path, 'w', encoding='utf-8') as f:
                        f.writelines([line + '\n' for line in defaultList])
                except IOError:
                    print('Error - could not write to config file', self.path)
                    self.path = ''
                return False

    def loadSet(self, list, data):
        """Reads settings from list into dict.
        """
        for line in list:
            line = line.split('#', 1)[0].strip()
            if line:
                item = line.split(None, 1) + ['']   # add value if blank
                data[item[0]] = item[1].strip()

    def addData(self, key, strData, storeChange=0):
        """Add new entry, add to write list if storeChange.
        """
        self.userDict[key] = strData
        if storeChange:
            self.chgList.append(key)

    def boolData(self, key):
        """Returns true or false from yes or no in option data.
        """
        for data in self.dictList:
            val = data.get(key)
            if val and val[0] in ('y', 'Y'):
                return True
            if val and val[0] in ('n', 'N'):
                return False
        print('Option error - bool key', key, 'is not valid')
        return False

    def numData(self, key, min=None, max=None):
        """Return float from option data.
        """
        for data in self.dictList:
            val = data.get(key)
            if val:
                try:
                    num = float(val)
                    if (min == None or num >= min) and \
                       (max == None or num <= max):
                        return num
                except ValueError:
                    pass
        print('Option error - float key', key, 'is not valid')
        return 0

    def intData(self, key, min=None, max=None):
        """Return int from option data.
        """
        for data in self.dictList:
            val = data.get(key)
            if val:
                try:
                    num = int(val)
                    if (min == None or num >= min) and \
                       (max == None or num <= max):
                        return num
                except ValueError:
                    pass
        print('Option error - int key', key, 'is not valid')
        return 0

    def strData(self, key, emptyOk=0):
        """Return string from option data.
        """
        for data in self.dictList:
            val = data.get(key)
            if val != None:
                if val or emptyOk:
                    return val
        print('Option error - string key', key, 'is not valid')
        return ''

    def changeData(self, key, strData, storeChange):
        """Change entry, add to write list if storeChange
           Return true if changed.
        """
        for data in self.dictList:
            val = data.get(key)
            if val != None:
                if strData == val:  # no change reqd
                    return False
                self.userDict[key] = strData
                if storeChange:
                    self.chgList.append(key)
                return True
        print('Option error - key', key, 'is not valid')
        return False

    def writeChanges(self):
        """Write any stored changes to the option file - rtn true on success.
        """
        if self.path and self.chgList:
            try:
                with open(self.path, 'r', encoding='utf-8') as f:
                    fileList = f.readlines()
                for key in self.chgList[:]:
                    hitList = [line for line in fileList if
                               line.strip().split(None, 1)[:1] == [key]]
                    if not hitList:
                        hitList = [line for line in fileList if
                                   line.replace('#', ' ', 1).strip().
                                   split(None, 1)[:1] == [key]]
                    if hitList:
                        fileList[fileList.index(hitList[-1])] = '{0}{1}\n'.\
                                format(key.ljust(self.keySpaces),
                                       self.userDict[key])
                        self.chgList.remove(key)
                for key in self.chgList:
                    fileList.append('{0}{1}\n'.format(key.ljust(self.keySpaces),
                                                      self.userDict[key]))
                with open(self.path, 'w', encoding='utf-8') as f:
                    f.writelines([line for line in fileList])
                return True
            except IOError:
                print('Error - could not write to config file', self.path)
        return False