DDMsgReader.js

	// Message list highlight colors: For each (except for the background),
	// prepend the normal attribute and append the background attribute to the end.
	// This is to ensure that high attributes don't affect the rest of the line and
	// the background attribute stays for the rest of the line.
	this.colors.msgListMsgNumHighlightColor = "\1n" + this.colors.msgListMsgNumHighlightColor + this.colors.msgListHighlightBkgColor;
	this.colors.msgListFromHighlightColor = "\1n" + this.colors.msgListFromHighlightColor + this.colors.msgListHighlightBkgColor;
	this.colors.msgListToHighlightColor = "\1n" + this.colors.msgListToHighlightColor + this.colors.msgListHighlightBkgColor;
	this.colors.msgListSubjHighlightColor = "\1n" + this.colors.msgListSubjHighlightColor + this.colors.msgListHighlightBkgColor;
	this.colors.msgListDateHighlightColor = "\1n" + this.colors.msgListDateHighlightColor + this.colors.msgListHighlightBkgColor;
	this.colors.msgListTimeHighlightColor = "\1n" + this.colors.msgListTimeHighlightColor + this.colors.msgListHighlightBkgColor;
	// Similar for the area chooser lightbar highlight colors
	this.colors.areaChooserMsgAreaNumHighlightColor = "\1n" + this.colors.areaChooserMsgAreaNumHighlightColor + this.colors.areaChooserMsgAreaBkgHighlightColor;
	this.colors.areaChooserMsgAreaDescHighlightColor = "\1n" + this.colors.areaChooserMsgAreaDescHighlightColor + this.colors.areaChooserMsgAreaBkgHighlightColor;
	this.colors.areaChooserMsgAreaDateHighlightColor = "\1n" + this.colors.areaChooserMsgAreaDateHighlightColor + this.colors.areaChooserMsgAreaBkgHighlightColor;
	this.colors.areaChooserMsgAreaTimeHighlightColor = "\1n" + this.colors.areaChooserMsgAreaTimeHighlightColor + this.colors.areaChooserMsgAreaBkgHighlightColor;
	this.colors.areaChooserMsgAreaNumItemsHighlightColor = "\1n" + this.colors.areaChooserMsgAreaNumItemsHighlightColor + this.colors.areaChooserMsgAreaBkgHighlightColor;
	// Similar for the enhanced reader help line colors
	this.colors.enhReaderHelpLineGeneralColor = "\1n" + this.colors.enhReaderHelpLineGeneralColor + this.colors.enhReaderHelpLineBkgColor;
	this.colors.enhReaderHelpLineHotkeyColor = "\1n" + this.colors.enhReaderHelpLineHotkeyColor + this.colors.enhReaderHelpLineBkgColor;
	this.colors.enhReaderHelpLineParenColor = "\1n" + this.colors.enhReaderHelpLineParenColor + this.colors.enhReaderHelpLineBkgColor;
	// Similar for the lightbar message list help line colors
	this.colors.lightbarMsgListHelpLineGeneralColor = "\1n" + this.colors.lightbarMsgListHelpLineGeneralColor + this.colors.lightbarMsgListHelpLineBkgColor;
	this.colors.lightbarMsgListHelpLineHotkeyColor = "\1n" + this.colors.lightbarMsgListHelpLineHotkeyColor + this.colors.lightbarMsgListHelpLineBkgColor;
	this.colors.lightbarMsgListHelpLineParenColor = "\1n" + this.colors.lightbarMsgListHelpLineParenColor + this.colors.lightbarMsgListHelpLineBkgColor;
	// Similar for the lightbar area chooser help line colors
	this.colors.lightbarAreaChooserHelpLineGeneralColor = "\1n" + this.colors.lightbarAreaChooserHelpLineGeneralColor + this.colors.lightbarAreaChooserHelpLineBkgColor;
	this.colors.lightbarAreaChooserHelpLineHotkeyColor = "\1n" + this.colors.lightbarAreaChooserHelpLineHotkeyColor + this.colors.lightbarAreaChooserHelpLineBkgColor;
	this.colors.lightbarAreaChooserHelpLineParenColor = "\1n" + this.colors.lightbarAreaChooserHelpLineParenColor + this.colors.lightbarAreaChooserHelpLineBkgColor;
	// Prepend most of the text strings with the normal attribute (if they don't
	// have it already) to make sure the correct colors are used.
	for (var prop in this.text)
	{
		if ((prop != "scrollbarBGChar") && (prop != "scrollbarScrollBlockChar"))
		{
			if ((this.text[prop].length > 0) && (this.text[prop].charAt(0) != "\1n"))
				this.text[prop] = "\1n" + this.text[prop];
		}
	}

	// this.tabReplacementText will be the text that tabs will be replaced
	// with in enhanced reader mode
	this.tabReplacementText = format("%" + this.numTabSpaces + "s", "");

	// Construct the message information format string.  These must be done after
	// reading the configuration file, because the configuration file specifies the
	// colors to use.
	this.sMsgInfoFormatStr = this.colors.msgListMsgNumColor + "%" + this.MSGNUM_LEN + "d%s"
	                       + this.colors.msgListFromColor + "%-" + this.FROM_LEN + "s "
	                       + this.colors.msgListToColor + "%-" + this.TO_LEN + "s "
	                       + this.colors.msgListSubjectColor + "%-" + this.SUBJ_LEN + "s "
	                       + this.colors.msgListDateColor + "%-" + this.DATE_LEN + "s "
	                       + this.colors.msgListTimeColor + "%-" + this.TIME_LEN + "s";
	// Message information format string with colors to use when the message is
	// written to the user.
	this.sMsgInfoToUserFormatStr = this.colors.msgListToUserMsgNumColor + "%" + this.MSGNUM_LEN + "d%s"
	                             + this.colors.msgListToUserFromColor
	                             + "%-" + this.FROM_LEN + "s " + this.colors.msgListToUserToColor + "%-"
	                             + this.TO_LEN + "s " + this.colors.msgListToUserSubjectColor + "%-"
	                             + this.SUBJ_LEN + "s " + this.colors.msgListToUserDateColor
	                             + "%-" + this.DATE_LEN + "s " + this.colors.msgListToUserTimeColor
	                             + "%-" + this.TIME_LEN + "s";
	// Message information format string with colors to use when the message is
	// from the user.
	this.sMsgInfoFromUserFormatStr = this.colors.msgListFromUserMsgNumColor + "%" + this.MSGNUM_LEN + "d%s"
	                               + this.colors.msgListFromUserFromColor
	                               + "%-" + this.FROM_LEN + "s " + this.colors.msgListFromUserToColor + "%-"
	                               + this.TO_LEN + "s " + this.colors.msgListFromUserSubjectColor + "%-"
	                               + this.SUBJ_LEN + "s " + this.colors.msgListFromUserDateColor
	                               + "%-" + this.DATE_LEN + "s " + this.colors.msgListFromUserTimeColor
	                               + "%-" + this.TIME_LEN + "s";
	// Highlighted message information line for the message list (used for the
	// lightbar interface)
	this.sMsgInfoFormatHighlightStr = this.colors.msgListMsgNumHighlightColor
	                                + "%" + this.MSGNUM_LEN + "d%s"
	                                + this.colors.msgListFromHighlightColor + "%-" + this.FROM_LEN
	                                + "s " + this.colors.msgListToHighlightColor + "%-" + this.TO_LEN + "s "
	                                + this.colors.msgListSubjHighlightColor + "%-" + this.SUBJ_LEN + "s "
	                                + this.colors.msgListDateHighlightColor + "%-" + this.DATE_LEN + "s "
	                                + this.colors.msgListTimeHighlightColor + "%-" + this.TIME_LEN + "s";

	// If the user's terminal doesn't support ANSI, then append a newline to
	// the end of the format string (we won't be able to move the cursor).
	if (!canDoHighASCIIAndANSI())
	{
		this.sMsgInfoFormatStr += "\r\n";
		this.sMsgInfoToUserFormatStr += "\r\n";
		this.sMsgInfoFromUserFormatStr += "\r\n";
		this.sMsgInfoFormatHighlightStr += "\r\n";
	}
	// Enhanced reader help line (will be set up in
	// DigDistMsgReader_SetEnhancedReaderHelpLine())
	this.enhReadHelpLine = "";

	// Read the enhanced message header file and populate this.enhMsgHeaderLines,
	// the header text for enhanced reader mode.  The enhanced reader header file
	// name will start with 'enhMsgHeader', and there can be multiple versions for
	// different terminal widths (i.e., msgHeader_80.ans for an 80-column console
	// and msgHeader_132 for a 132-column console).
	this.enhMsgHeaderLines = loadTextFileIntoArray("enhMsgHeader", 10);
	// If the header file didn't exist, then populate the enhanced reader header
	// array with default lines.
	if (this.enhMsgHeaderLines.length == 0)
	{
		// Group name: 20% of console width
		// Sub-board name: 34% of console width
		var msgGrpNameLen = Math.floor(console.screen_columns * 0.2);
		var subBoardNameLen = Math.floor(console.screen_columns * 0.34);
		var hdrLine1 = "\1n\1h\1c" + UPPER_LEFT_SINGLE + HORIZONTAL_SINGLE + "\1n\1c"
		             + HORIZONTAL_SINGLE + " \1h@GRP-L";
		var numChars = msgGrpNameLen - 7;
		for (var i = 0; i < numChars; ++i)
			hdrLine1 += "#";
		hdrLine1 += "@ @SUB-L";
		numChars = subBoardNameLen - 7;
		for (var i = 0; i < numChars; ++i)
			hdrLine1 += "#";
		hdrLine1 += "@\1k";
		numChars = console.screen_columns - console.strlen(hdrLine1) - 4;
		for (var i = 0; i < numChars; ++i)
			hdrLine1 += HORIZONTAL_SINGLE;
		hdrLine1 += "\1n\1c" + HORIZONTAL_SINGLE + HORIZONTAL_SINGLE + "\1h"
		         + HORIZONTAL_SINGLE + UPPER_RIGHT_SINGLE;
		this.enhMsgHeaderLines.push(hdrLine1);
		var hdrLine2 = "\1n\1c" + VERTICAL_SINGLE + "\1h\1k" + BLOCK1 + BLOCK2
		             + BLOCK3 + "\1gM\1n\1gsg#\1h\1c: \1b@MSG_NUM_AND_TOTAL-L";
		numChars = console.screen_columns - 32;
		for (var i = 0; i < numChars; ++i)
			hdrLine2 += "#";
		hdrLine2 += "@\1n\1c" + VERTICAL_SINGLE;
		this.enhMsgHeaderLines.push(hdrLine2);
		var hdrLine3 = "\1n\1h\1k" + VERTICAL_SINGLE + BLOCK1 + BLOCK2 + BLOCK3
		             + "\1gF\1n\1grom\1h\1c: \1b@MSG_FROM-L";
		numChars = console.screen_columns - 23;
		for (var i = 0; i < numChars; ++i)
			hdrLine3 += "#";
		hdrLine3 += "@\1k" + VERTICAL_SINGLE;
		this.enhMsgHeaderLines.push(hdrLine3);
		var hdrLine4 = "\1n\1h\1k" + VERTICAL_SINGLE + BLOCK1 + BLOCK2 + BLOCK3
		             + "\1gT\1n\1go  \1h\1c: \1b@MSG_TO-L";
		numChars = console.screen_columns - 21;
		for (var i = 0; i < numChars; ++i)
			hdrLine4 += "#";
		hdrLine4 += "@\1k" + VERTICAL_SINGLE;
		this.enhMsgHeaderLines.push(hdrLine4);
		var hdrLine5 = "\1n\1h\1k" + VERTICAL_SINGLE + BLOCK1 + BLOCK2 + BLOCK3
		             + "\1gS\1n\1gubj\1h\1c: \1b@MSG_SUBJECT-L";
		numChars = console.screen_columns - 26;
		for (var i = 0; i < numChars; ++i)
			hdrLine5 += "#";
		hdrLine5 += "@\1k" + VERTICAL_SINGLE;
		this.enhMsgHeaderLines.push(hdrLine5);
		var hdrLine6 = "\1n\1c" + VERTICAL_SINGLE + "\1h\1k" + BLOCK1 + BLOCK2 + BLOCK3
		             + "\1gD\1n\1gate\1h\1c: \1b@MSG_DATE-L";
		//numChars = console.screen_columns - 23;
		numChars = console.screen_columns - 67;
		for (var i = 0; i < numChars; ++i)
			hdrLine6 += "#";
		//hdrLine6 += "@\1n\1c" + VERTICAL_SINGLE;
		hdrLine6 += "@ @MSG_TIMEZONE@\1n";
		for (var i = 0; i < 40; ++i)
			hdrLine6 += " ";
		hdrLine6 += "\1n\1c" + VERTICAL_SINGLE;
		this.enhMsgHeaderLines.push(hdrLine6);
		var hdrLine7 = "\1n\1h\1c" + BOTTOM_T_SINGLE + HORIZONTAL_SINGLE + "\1n\1c"
		             + HORIZONTAL_SINGLE + HORIZONTAL_SINGLE + "\1h\1k";
		numChars = console.screen_columns - 8;
		for (var i = 0; i < numChars; ++i)
			hdrLine7 += HORIZONTAL_SINGLE;
		hdrLine7 += "\1c" + HORIZONTAL_SINGLE + HORIZONTAL_SINGLE + "\1h"
		         + HORIZONTAL_SINGLE + BOTTOM_T_SINGLE;
		this.enhMsgHeaderLines.push(hdrLine7);
	}
	// Save the enhanced reader header width.  This will be the length of the longest
	// line in the header.
	this.enhMsgHeaderWidth = 0;
	if (this.enhMsgHeaderLines.length > 0)
	{
		var lineLen = 0;
		for (var i = 0; i < this.enhMsgHeaderLines.length; ++i)
		{
			lineLen = console.strlen(this.enhMsgHeaderLines[i]);
			if (lineLen > this.enhMsgHeaderWidth)
				this.enhMsgHeaderWidth = lineLen;
		}
	}

	// Message display area information
	this.msgAreaTop = this.enhMsgHeaderLines.length + 1;
	this.msgAreaBottom = console.screen_rows-1;  // The last line of the message area
	// msgAreaLeft and msgAreaRight are the rightmost and leftmost columns of the
	// message area, respectively.  These are 1-based.  1 is subtracted from
	// msgAreaRight to leave room for the scrollbar in enhanced reader mode.
	this.msgAreaLeft = 1;
	this.msgAreaRight = console.screen_columns - 1;
	this.msgAreaWidth = this.msgAreaRight - this.msgAreaLeft + 1;
	this.msgAreaHeight = this.msgAreaBottom - this.msgAreaTop + 1;

	//////////////////////////////////////////////
	// Things related to changing to a different message group & sub-board

	// In the message area lists (for changing to another message area), the
	// date & time of the last-imported message will be shown.
	// msgAreaList_lastImportedMsg_showImportTime is a boolean to specify
	// whether or not to use the import time for the last-imported message.
	// If false, the message written time will be used.
	this.msgAreaList_lastImportedMsg_showImportTime = true;

	// These variables store the lengths of the various columns displayed in
	// the message group/sub-board lists.
	// Sub-board info field lengths
	this.areaNumLen = 4;
	this.numItemsLen = 4;
	this.dateLen = 10; // i.e., YYYY-MM-DD
	this.timeLen = 8;  // i.e., HH:MM:SS
	// Sub-board name length - This should be 47 for an 80-column display.
	this.subBoardNameLen = console.screen_columns - this.areaNumLen -
	this.numItemsLen - this.dateLen - this.timeLen - 7;
	// Message group description length (67 chars on an 80-column screen)
	this.msgGrpDescLen = console.screen_columns - this.areaNumLen -
	this.numItemsLen - 5;

	// Some methods for choosing the message area
	this.WriteChgMsgAreaKeysHelpLine = DigDistMsgReader_WriteLightbarChgMsgAreaKeysHelpLine;
	this.WriteGrpListHdrLine = DigDistMsgReader_WriteGrpListTopHdrLine;
	this.WriteSubBrdListHdr1Line = DMsgAreaChooser_WriteSubBrdListHdr1Line;
	this.SelectMsgArea = DigDistMsgReader_SelectMsgArea;
	this.SelectMsgArea_Lightbar = DigDistMsgReader_SelectMsgArea_Lightbar;
	this.SelectSubBoard_Lightbar = DigDistMsgReader_SelectSubBoard_Lightbar;
	this.SelectMsgArea_Traditional = DigDistMsgReader_SelectMsgArea_Traditional;
	this.ListMsgGrps = DigDistMsgReader_ListMsgGrps_Traditional;
	this.ListSubBoardsInMsgGroup = DigDistMsgReader_ListSubBoardsInMsgGroup_Traditional;
	// Lightbar-specific methods
	this.ListScreenfulOfMsgGrps = DigDistMsgReader_listScreenfulOfMsgGrps;
	this.WriteMsgGroupLine = DigDistMsgReader_writeMsgGroupLine;
	this.UpdateMsgAreaPageNumInHeader = DigDistMsgReader_updateMsgAreaPageNumInHeader;
	this.ListScreenfulOfSubBrds = DigDistMsgReader_ListScreenfulOfSubBrds;
	this.WriteMsgSubBoardLine = DigDistMsgReader_WriteMsgSubBrdLine;
	// Choose Message Area help screen
	this.ShowChooseMsgAreaHelpScreen = DigDistMsgReader_showChooseMsgAreaHelpScreen;
	// Method to build the sub-board printf information for a message
	// group
	this.BuildSubBoardPrintfInfoForGrp = DigDistMsgReader_BuildSubBoardPrintfInfoForGrp;
	// Methods for calculating a page number for a message list item
	this.CalcTraditionalMsgListTopIdx = DigDistMsgReader_CalcTraditionalMsgListTopIdx;
	this.CalcLightbarMsgListTopIdx = DigDistMsgReader_CalcLightbarMsgListTopIdx;
	this.CalcMsgListScreenIdxVarsFromMsgNum = DigDistMsgReader_CalcMsgListScreenIdxVarsFromMsgNum;
	// A method for validating a user's choice of message area
	this.ValidateMsgAreaChoice = DigDistMsgReader_ValidateMsgAreaChoice;

	// printf strings for message group/sub-board lists
	// Message group information (printf strings)
	this.msgGrpListPrintfStr = "\1n " + this.colors.areaChooserMsgAreaNumColor + "%" + this.areaNumLen
	                         + "d " + this.colors.areaChooserMsgAreaDescColor + "%-"
	                         + this.msgGrpDescLen + "s " + this.colors.areaChooserMsgAreaNumItemsColor
	                         + "%" + this.numItemsLen + "d";
	this.msgGrpListHilightPrintfStr = "\1n" + this.colors.areaChooserMsgAreaBkgHighlightColor + " "
	                                + "\1n" + this.colors.areaChooserMsgAreaBkgHighlightColor
	                                + this.colors.areaChooserMsgAreaNumHighlightColor + "%" + this.areaNumLen
	                                + "d \1n" + this.colors.areaChooserMsgAreaBkgHighlightColor
	                                + this.colors.areaChooserMsgAreaDescHighlightColor + "%-"
	                                + this.msgGrpDescLen + "s \1n" + this.colors.areaChooserMsgAreaBkgHighlightColor
	                                + this.colors.areaChooserMsgAreaNumItemsHighlightColor + "%" + this.numItemsLen
	                                + "d";
	// Message group list header (printf string)
	this.msgGrpListHdrPrintfStr = this.colors.areaChooserMsgAreaHeaderColor + "%6s %-"
	                            + +(this.msgGrpDescLen-8) + "s %-12s";
	// Sub-board information header (printf string)
	this.subBoardListHdrPrintfStr = this.colors.areaChooserMsgAreaHeaderColor + " %5s %-"
	                              + +(this.subBoardNameLen-3) + "s %-7s %-19s";
	// Lightbar area chooser help line text
	// TODO: Account for wide terminals?
	this.lightbarAreaChooserHelpLine = "\1n"
	                          + this.colors.lightbarAreaChooserHelpLineHotkeyColor + ""
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + ", "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + ""
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + ", "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "ENTER"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + ", "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "HOME"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + ", "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "END"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + ", "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "#"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + ", "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "N"
							  + this.colors.lightbarAreaChooserHelpLineParenColor + ")"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + "ext pg, "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "P"
							  + this.colors.lightbarAreaChooserHelpLineParenColor + ")"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + "rev pg, "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "F"
							  + this.colors.lightbarAreaChooserHelpLineParenColor + ")"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + "irst pg, "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "L"
							  + this.colors.lightbarAreaChooserHelpLineParenColor + ")"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + "ast pg, "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "Q"
							  + this.colors.lightbarAreaChooserHelpLineParenColor + ")"
							  + this.colors.lightbarAreaChooserHelpLineGeneralColor + "uit, "
							  + this.colors.lightbarAreaChooserHelpLineHotkeyColor + "?   ";
	// this.subBoardListPrintfInfo will be an array of printf strings
	// for the sub-boards in the message groups.  The index is the
	// message group index.  The sub-board printf information is created
	// on the fly the first time the user lists sub-boards for a message
	// group.
	this.subBoardListPrintfInfo = new Array();

	// Variables to save the top message index for the traditional & lightbar
	// message lists.  Initialize them to -1 to mean the message list hasn't been
	// displayed yet - In that case, the lister will use the user's last
	// read pointer.
	this.tradListTopMsgIdx = -1;
	this.tradMsgListNumLines = console.screen_rows-3;
	if (this.displayBoardInfoInHeader)
		this.tradMsgListNumLines -= 2;
	this.lightbarListTopMsgIdx = -1;
	this.lightbarMsgListNumLines = console.screen_rows-2;
	this.lightbarMsgListStartScreenRow = 2; // The first line number on the screen for the message list
	// If we will be displaying the message group and sub-board in the
	// header at the top of the screen (an additional 2 lines), then
	// update this.lightbarMsgListNumLines and this.lightbarMsgListStartScreenRow to
	// account for this.
	if (this.displayBoardInfoInHeader)
	{
		this.lightbarMsgListNumLines -= 2;
		this.lightbarMsgListStartScreenRow += 2;
	}
	// The selected message index for the lightbar message list (initially -1, will
	// be set in the lightbar list method)
	this.lightbarListSelectedMsgIdx = -1;
	// The selected message cursor position for the lightbar message list (initially
	// null, will be set in the lightbar list message)
	this.lightbarListCurPos = null;

	// selectedMessages will be an object (indexed by sub-board internal code)
	// containing objects that contain message indexes (as properties) for the
	// sub-boards.  Messages can be selected by the user for doing things such
	// as a batch delete, etc.
	this.selectedMessages = new Object();

	// areaChangeHdrLines is an array of text lines to use as a header to display
	// above the message area changer lists.
	this.areaChangeHdrLines = loadTextFileIntoArray(this.areaChooserHdrFilenameBase, this.areaChooserHdrMaxLines);

	// pausePromptText is the text that will be used for some of the pause
	// prompts.  It's loaded from text.dat, but in case that text contains
	// "@EXEC:" (to execute a script), this script will default to a "press
	// a key" message.
	this.pausePromptText = bbs.text(Pause);
	if (this.pausePromptText.toUpperCase().indexOf("@EXEC:") > -1)
		this.pausePromptText = "\1n\1c[ Press a key ] ";
}

// For the DigDistMsgReader class: Sets the subBoardCode property and also
// sets the readingPersonalEmail property, a boolean for whether or not
// personal email is being read (whether the sub-board code is "mail")
//
// Parameters:
//  pSubCode: The sub-board code to set in the object
function DigDistMsgReader_SetSubBoardCode(pSubCode)
{
	this.subBoardCode = pSubCode;
	this.readingPersonalEmail = (this.subBoardCode == "mail");
}

// Refreshes a message header in the message header arrays in this.msgSearchHdrs.
//
// Parameters:
//  pMsgIndex: The index (0-based) of the message header
//  pAttrib: Optional - An attribute to apply.  If this is is not specified,
//           then the message header will be retrieved from the message base.
// pSubBoardCode: Optional - An internal sub-board code.  If not specified, then
//                this method will default to this.subBoardCode.
function DigDistMsgReader_RefreshSearchResultMsgHdr(pMsgIndex, pAttrib, pSubBoardCode)
{
	if (typeof(pMsgIndex) != "number")
		return;

	var subCode = (typeof(pSubBoardCode) == "string" ? pSubBoardCode : this.subBoardCode);
	if (this.msgSearchHdrs.hasOwnProperty(subCode))
	{
		var msgNum = pMsgIndex + 1;
		if (typeof(pAttrib) != "undefined")
		{
			if (this.msgSearchHdrs[this.subBoardCode].indexed.hasOwnProperty(pMsgIndex))
			{
				this.msgSearchHdrs[this.subBoardCode].indexed[pMsgIndex].attr = this.msgSearchHdrs[this.subBoardCode].indexed[pMsgIndex].attr | pAttrib;
				var msgOffsetFromHdr = this.msgSearchHdrs[this.subBoardCode].indexed[pMsgIndex].offset;
				this.msgbase.put_msg_header(true, msgOffsetFromHdr, this.msgSearchHdrs[this.subBoardCode].indexed[pMsgIndex]);
			}
		}
		else
		{
			var msgHeader = this.GetMsgHdrByIdx(pMsgIndex);
			if (this.msgSearchHdrs[this.subBoardCode].indexed.hasOwnProperty(pMsgIndex))
			{
				this.msgSearchHdrs[this.subBoardCode].indexed[pMsgIndex] = msgHeader;
				this.msgbase.put_msg_header(true, msgHeader.offset, msgHeader);
			}
		}
	}
}

// For the DigDistMsgReader class: Inputs search text from the user, then reads/lists
// messages, which will perform the search.
//
// Paramters:
//  pSearchModeStr A string to specify the lister mode to use - This can
//                 be one of the search modes to specify how to search:
//                 "keyword_search": Search the message subjects & bodies by keyword
//                 "from_name_search": Search messages by from name
//                 "to_name_search": Search messages by to name
//                 "to_user_search": Search messages by to name, to the logged-in user
//  pSubBoardCode: Optional - The Synchronet sub-board code, or "mail"
//                 for personal email.
function DigDistMsgReader_SearchMessages(pSearchModeStr, pSubBoardCode)
{
	// Convert the search mode string to an integer representing the search
	// mode.  If we get back -1, that means the search mode string was invalid.
	// If that's the case, simply list messages.  Otherwise, do the search.
	this.searchType = searchTypeStrToVal(pSearchModeStr);
	if (this.searchType == SEARCH_NONE) // No search; search mode string was invalid
	{
		// Clear the search information and read/list messages.
		this.ClearSearchData();
		this.ReadOrListSubBoard(pSubBoardCode);
	}
	else
	{
		// The search mode string was valid, so go ahead and search.
		console.print("\1n");
		console.crlf();
		var subCode = (typeof(pSubBoardCode) == "string" ? pSubBoardCode : this.subBoardCode);
		if (subCode == "mail")
			console.print("\1n" + this.text.searchingPersonalMailText);
		else
			console.print("\1n" + this.text.searchingSubBoardAbovePromptText.replace("%s", subBoardGrpAndName(bbs.cursub_code)) + "\1n");
		console.crlf();
		// Output the prompt text to the user (for modes where a prompt is needed)
		switch (this.searchType)
		{
		case SEARCH_KEYWORD:
			console.print("\1n" + this.text.searchTextPromptText);
			break;
		case SEARCH_FROM_NAME:
			console.print("\1n" + this.text.fromNamePromptText);
			break;
		case SEARCH_TO_NAME_CUR_MSG_AREA:
			console.print("\1n" + this.text.toNamePromptText);
			break;
		case SEARCH_TO_USER_CUR_MSG_AREA:
			// Note: No prompt needed for this - Will search for the user's name/handle
			console.line_counter = 0; // To prevent a pause before the message list comes up
			break;
		default:
			break;
		}
		//var promptUserForText = this.SearchTypePopulatesSearchResults();
		var promptUserForText = this.SearchTypeRequiresSearchText();
		// Get the search text from the user
		if (promptUserForText)
			this.searchString = console.getstr(512, K_UPPER);
		// If the user was prompted for search text but no search text was entered,
		// then show an abort message and don't do anything.  Otherwise, go ahead
		// and list/read messages.
		if (promptUserForText && (this.searchString.length == 0))
		{
			this.ClearSearchData();
			console.print("\1n" + this.text.abortedText);
			console.crlf();
			console.pause();
			return;
		}
		else
		{
			// List/read messages
			this.ReadOrListSubBoard(pSubBoardCode);
			// Clear the search data so that subsequent listing or reading sessions
			// don't repeat the same search
			this.ClearSearchData();
		}
	}
}

// This function clears the search data from the object.
function DigDistMsgReader_ClearSearchData()
{
   this.searchType = SEARCH_NONE;
   this.searchString == "";
   if (this.msgSearchHdrs != null)
   {
		for (var subCode in this.msgSearchHdrs)
		{
			delete this.msgSearchHdrs[subCode].indexed;
			delete this.msgSearchHdrs[subCode];
		}
		delete this.msgSearchHdrs;
		this.msgSearchHdrs = new Object();
   }
}

// For the DigDistMsgReader class: Performs message reading/listing.
// Depending on the value of this.startMode, starts in either reader
// mode or lister mode.  Uses an input loop to let the user switch
// between the two modes.
//
// Parameters:
//  pSubBoardCode: Optional - The internal code of a sub-board to read.
//                 If not specified, the internal sub-board code specified
//                 when creating the object will be used.
//  pStartingMsgOffset: Optional - The offset of a message to start at
//  pAllowChgArea: Optional boolean - Whether or not to allow changing the
//                 message area
//  pReturnOnNextAreaNav: Optional boolean - Whether or not this method should
//                        return when it would move to the next message area due
//                        navigation from the user (i.e., with the right arrow key)
//  pPauseOnNoMsgSrchResults: Optional boolean - Whether or not to pause when
//                            a message search doesn't find any search results
//                            in the current sub-board.  Defaults to true.
//
// Return value: An object with the following properties:
//               stoppedReading: Boolean - Whether or not the user stopped reading.
//                               This can also be true if there is an error.
function DigDistMsgReader_ReadOrListSubBoard(pSubBoardCode, pStartingMsgOffset,
                                              pAllowChgArea, pReturnOnNextAreaNav,
                                              pPauseOnNoMsgSrchResults)
{
   var retObj = new Object();
   retObj.stoppedReading = false;

   // Set the sub-board code if applicable
   var previousSubBoardCode = this.subBoardCode;
   if (typeof(pSubBoardCode) == "string")
   {
      if (subBoardCodeIsValid(pSubBoardCode))
         this.setSubBoardCode(pSubBoardCode);
      else
      {
         console.print("\1n\1h\1yWarning: \1wThe Message Reader connot continue because an invalid");
         console.crlf();
         console.print("sub-board code was specified (" + pSubBoardCode + "). Please notify the sysop.");
         console.crlf();
         console.pause();
         retObj.stoppedReading = true;
         return retObj;
      }
   }
   // (re)-open the message base
   if (previousSubBoardCode != this.subBoardCode)
   {
      if ((this.msgbase != null) && (this.msgbase.is_open))
         this.msgbase.close();
      this.msgbase = new MsgBase(this.subBoardCode);
   }
   else if (this.msgbase == null)
       this.msgbase = new MsgBase(this.subBoardCode);

   // Open the sub-board.  If the message base was not opened, then output
   // an error and return.
	if (!this.msgbase.is_open && !this.msgbase.open())
	{
      console.print("\1n");
      console.crlf();
      console.print("\1h\1y* \1wUnable to open message sub-board:");
      console.crlf();
      console.print(subBoardGrpAndName(this.subBoardCode));
      console.crlf();
      console.pause();
      retObj.stoppedReading = true;
      return retObj;
	}

	// Populate this.msgSearchHdrs for the current sub-board if there is a search
	// specified.  If there are no messages to read in the current sub-board, then
	// just return.
	var pauseOnNoSearchResults = (typeof(pPauseOnNoMsgSrchResults) == "boolean" ? pPauseOnNoMsgSrchResults : true);
	if (!this.PopulateHdrsIfSearch_DispErrorIfNoMsgs(true, true, pauseOnNoSearchResults))
	{
		retObj.stoppedReading = false;
		return retObj;
	}

	// Check the pAllowChgArea parameter.  If it's a boolean, then use it.  If
	// not, then check to see if we're reading personal mail - If not, then allow
	// the user to change to a different message area.
	var allowChgMsgArea = true;
	if (typeof(pAllowChgArea) == "boolean")
		allowChgMsgArea = pAllowChgArea;
	else
		allowChgMsgArea = (this.subBoardCode != "mail");
	// If reading personal email and messages haven't been collected (searched)
	// yet, then do so now.
	if (this.readingPersonalEmail && (!this.msgSearchHdrs.hasOwnProperty(this.subBoardCode)))
		this.msgSearchHdrs[this.subBoardCode] = searchMsgbase(this.subBoardCode, this.msgbase, this.searchType, this.searchString, this.readingPersonalEmailFromUser);

	// Determine whether to start in list or reader mode, depending
	// on the value of this.startMode.
	var readerMode = this.startMode;
	// User input loop
	var selectedMessageOffset = 0;
	if (typeof(pStartingMsgOffset) == "number")
		selectedMessageOffset = pStartingMsgOffset;
	else if (this.SearchingAndResultObjsDefinedForCurSub())
	{
		// If reading personal mail, start at the first unread message index
		// (or the last message, if all messages have been read)
		if (this.readingPersonalEmail)
		{
			selectedMessageOffset = this.GetLastReadMsgIdx(false); // Used to be true
			if ((selectedMessageOffset > -1) && (selectedMessageOffset < this.NumMessages() - 1))
				++selectedMessageOffset;
		}
		else
			selectedMessageOffset = 0;
	}
	else
		selectedMessageOffset = -1;
	var otherRetObj = null;
	var continueOn = true;
	while (continueOn)
	{
		switch (readerMode)
		{
			case READER_MODE_READ:
				// Call the ReadMessages method - DOn't change the sub-board,
				// and pass the selected index of the message to read.  If that
				// index is -1, the ReadMessages method will use the user's
				// last-read message index.
				otherRetObj = this.ReadMessages(null, selectedMessageOffset, true,
				                                allowChgMsgArea, pReturnOnNextAreaNav);
				// If the user wants to quit or if there was an error, then stop
				// the input loop.
				if (otherRetObj.stoppedReading)
				{
					retObj.stoppedReading = true;
					continueOn = false;
				}
				// If we're set to return on navigation to the next message area and
				// the user's last keypress was the right arrow key or next action
				// was to go to the next message area, then don't continue the input
				// loop, and also say that the user didn't stop reading.
				else if (pReturnOnNextAreaNav &&
				         ((otherRetObj.lastUserInput == KEY_RIGHT) || (otherRetObj.lastUserInput == KEY_ENTER) || (otherRetObj.lastAction == ACTION_GO_NEXT_MSG_AREA)))
				{
					retObj.stoppedReading = false;
					continueOn = false;
				}
				else if (otherRetObj.messageListReturn)
					readerMode = READER_MODE_LIST;
				break;
			case READER_MODE_LIST:
				// Note: Doing the message list is also handled in this.ReadMessages().
				// This code is here in case the reader is configured to start up
				// in list mode first.
				// List messages
				otherRetObj = this.ListMessages(null, pAllowChgArea);
				// If the user wants to quit, set continueOn to false to get out
				// of the loop.  Otherwise, set the selected message offset to
				// what the user chose from the list.
				if (otherRetObj.lastUserInput == "Q")
				{
					retObj.stoppedReading = true;
					continueOn = false;
				}
				else
				{
					selectedMessageOffset = otherRetObj.selectedMsgOffset;
					readerMode = READER_MODE_READ;
				}
				break;
			default:
				break;
		}
	}

   // Close the message base object (if it has not been closed already),
   // re-enable the normal text attribute, and clear the screen.
   if (this.msgbase != null)
   {
      this.msgbase.close();
      this.msgbase = null;
   }
	console.clear("\1n");

	return retObj;
}
// Helper for DigDistMsgReader_ReadOrListSubBoard(): Populates this.msgSearchHdrs
// if an applicable search type is specified; also, if there are no messages in
// the current sub-board, outputs an error to the user.
//
// Parameters:
//  pCloseMsgbaseAndSetNullIfNoMsgs: Optional boolean - Whether or not to close the message
//                         base if there are no messages.  Defaults to true.
//  pOutputMessages: Boolean - Whether or not to output messages to the screen.
//                   Defaults to true.
//  pPauseOnNoMsgError: Optional boolean - Whether or not to pause for a keypress
//                      after displaying the "no messages" error.  Defaults to true.
//
// Return value: Boolean - Whether or not there are messages to read in the current
//               sub-board
function DigDistMsgReader_PopulateHdrsIfSearch_DispErrorIfNoMsgs(pCloseMsgbaseAndSetNullIfNoMsgs,
                                                 pOutputMessages, pPauseOnNoMsgError)
{
	var thereAreMessagesToRead = true;

	var outputMessages = (typeof(pOutputMessages) == "boolean" ? pOutputMessages : true);

	// If a search is is specified that would populate the search results, then
	// perform the message search for the current sub-board.
	if (this.SearchTypePopulatesSearchResults())
	{
		if (!this.msgSearchHdrs.hasOwnProperty(this.subBoardCode))
		{
			// TODO: In case new messages were posted in this sub-board, it might help
			// to check the current number of messages vs. the previous number of messages
			// and search the new messages if there are more.
			if (outputMessages)
			{
				console.crlf();
				if (this.readingPersonalEmail)
					console.print("\1n" + this.text.loadingPersonalMailText.replace("%s", subBoardGrpAndName(this.subBoardCode)));
				else
					console.print(this.text.searchingSubBoardText.replace("%s", subBoardGrpAndName(this.subBoardCode)));
			}
			this.msgSearchHdrs[this.subBoardCode] = searchMsgbase(this.subBoardCode, this.msgbase, this.searchType, this.searchString, this.readingPersonalEmailFromUser);
		}
	}
	else
	{
		// There is no search is specified, so clear the search results for the
		// current sub-board to help ensure that there are messages to read.
		if (this.msgSearchHdrs.hasOwnProperty(this.subBoardCode))
		{
			delete this.msgSearchHdrs[this.subBoardCode].indexed;
			delete this.msgSearchHdrs[this.subBoardCode];
		}
	}

	// If there are no messages to display in the current sub-board, then set the
	// return value and let the user know (if outputMessages is true).
	if (this.NumMessages() == 0)
	{
		thereAreMessagesToRead = false;
		var closeMsgbase = (typeof(pCloseMsgbaseAndSetNullIfNoMsgs) == "boolean" ? pCloseMsgbaseAndSetNullIfNoMsgs : true);
		if (closeMsgbase)
		{
			this.msgbase.close();
			this.msgbase = null;
		}
		if (outputMessages)
		{
			console.print("\1n");
			console.crlf();
			if (this.readingPersonalEmail)
				console.print(this.text.noPersonalEmailText);
			else
			{
				if (this.msgSearchHdrs.hasOwnProperty(this.subBoardCode))
					console.print(this.text.noSearchResultsInSubBoardText.replace("%s", subBoardGrpAndName(this.subBoardCode)));
				else
					console.print(this.text.noMessagesInSubBoardText.replace("%s", subBoardGrpAndName(this.subBoardCode)));
			}
			console.crlf();
			var pauseOnNoMsgsError = (typeof(pPauseOnNoMsgError) == "boolean" ? pPauseOnNoMsgError : true);
			if (pauseOnNoMsgsError)
				console.pause();
		}
	}

	return thereAreMessagesToRead;
}

// For the DigDistMsgReader class: Returns whether the search type is a type
// that would result in the search results structure being populated.  Search
// types where that wouldn't happen are SEARCH_NONE (no search) and any of the
// message scan search types.
function DigDistMsgReader_SearchTypePopulatesSearchResults()
{
	return (this.readingPersonalEmail || searchTypePopulatesSearchResults(this.searchType));
}

// For the DigDistMsgReader class: Returns whether the search type is a type
// that requires search text.  Search types that require search text are the
// keyword search, from name search, and to name search.  Search types that
// don't require search text are SEARCH_NONE (no search) & the message scan search
// types.
function DigDistMsgReader_SearchTypeRequiresSearchText()
{
	return searchTypeRequiresSearchText(this.searchType);
}

// Returns whether a search type value would populate search results.
//
// Parameters:
//  pSearchType: A search type integer value
//
// Return value: Boolean - Whether or not the search type would populate search
//               results
function searchTypePopulatesSearchResults(pSearchType)
{
	return ((pSearchType == SEARCH_KEYWORD) ||
	        (pSearchType == SEARCH_FROM_NAME) ||
	        (pSearchType == SEARCH_TO_NAME_CUR_MSG_AREA) ||
	        (pSearchType == SEARCH_TO_USER_CUR_MSG_AREA) ||
	        (pSearchType == SEARCH_TO_USER_NEW_SCAN) ||
			(pSearchType == SEARCH_TO_USER_NEW_SCAN_CUR_SUB) ||
	        (pSearchType == SEARCH_TO_USER_NEW_SCAN_CUR_GRP) ||
	        (pSearchType == SEARCH_TO_USER_NEW_SCAN_ALL) ||
	        (pSearchType == SEARCH_ALL_TO_USER_SCAN));
}

// Returns whether a search type value requires search text.
//
// Parameters:
//  pSearchType: A search type integer value
//
// Return value: Boolean - Whether or not the search type requires search text
function searchTypeRequiresSearchText(pSearchType)
{
	return ((pSearchType == SEARCH_KEYWORD) ||
	         (pSearchType == SEARCH_FROM_NAME) ||
	         (pSearchType == SEARCH_TO_NAME_CUR_MSG_AREA));
}

// For the DigDistMsgReader class: Scans the message area(s) for new messages,
// unread messages to the user, or all messages to the user.
//
// Parameters:
//  pScanCfgOpt: The scan configuration option to check for in the sub-boards
//               (from sbbsdefs.js). Supported values are SCAN_CFG_NEW (new
//               message scan) and SCAN_CFG_TOYOU (messages to the user).
//  pScanMode: The scan mode (from sbbsdefs.js).  Supported values are SCAN_NEW
//             (new message scan), SCAN_TOYOU (scan for all messages to the
//             user), and SCAN_UNREAD (scan for new messages to the user).
//  pScanScopeChar: Optional - A character (as a string) representing the scan
//                  scope: "S" for sub-board, "G" for group, or "A" for all.
//                  If this is not specified, the user will be prompted for the
//                  scan scope.
function DigDistMsgReader_MessageAreaScan(pScanCfgOpt, pScanMode, pScanScopeChar)
{
	var scanScopeChar = "";
	if ((typeof(pScanScopeChar) == "string") && /^[SGA]$/.test(pScanScopeChar))
		scanScopeChar = pScanScopeChar;
	else
	{
		// Prompt the user to scan in the current sub-board, the current message group,
		// or all.  Default to all.
		console.print(this.text.scanScopePromptText);
		scanScopeChar = console.getkeys("SGAC").toString();
		// If the user just pressed Enter without choosing anything, then abort and return.
		if (scanScopeChar.length == 0)
		{
			console.crlf();
			console.print(this.text.msgScanAbortedText);
			console.crlf();
			console.pause();
			return;
		}
	}

	// Do some logging if verbose logging is enabled
	if (gCmdLineArgVals.verboselogging)
	{
		var logMessage = "Doing a message area scan (";
		if (pScanCfgOpt == SCAN_CFG_NEW)
		{
			// The only valid value for pScanMode in this case is SCAN_NEW, so no
			// need to check pScanMode to append more to the log message.
			logMessage += "new";
		}
		else if (pScanCfgOpt == SCAN_CFG_TOYOU)
		{
			// Valid values for pScanMode in this case are SCAN_UNREAD and SCAN_TOYOU.
			if (pScanMode == SCAN_UNREAD)
				logMessage += "unread messages to the user";
			else if (pScanMode == SCAN_TOYOU)
				logMessage += "all messages to the user";
		}
		if (scanScopeChar == "A") // All sub-boards
			logMessage += ", all sub-boards";
		else if (scanScopeChar == "G") // Current message group
		{
			logMessage += ", current message group (" +
			              msg_area.grp_list[bbs.curgrp].description + ")";
		}
		else if (scanScopeChar == "S") // Current sub-board
		{
			logMessage += ", current sub-board (" +
			              msg_area.grp_list[bbs.curgrp].description + " - " +
						  msg_area.grp_list[bbs.curgrp].sub_list[bbs.cursub].description + ")";
		}
		logMessage += ")";
		writeToSysAndNodeLog(logMessage);
	}

	// Save the original search type, sub-board code, searched message headers,
	// etc. to be restored later
	var originalSearchType = this.searchType;
	var originalSubBoardCode = this.subBoardCode;
	var originalBBSCurGrp = bbs.curgrp;
	var originalBBSCurSub = bbs.cursub;
	var originalMsgSrchHdrs = this.msgSearchHdrs;

	// Make sure there is no search data
	this.ClearSearchData();

	// If the object's message base is currently open, then close it.  The object's
	// message base object will be used to open each sub-board to scan for & read
	// unread messages.
	if ((this.msgbase != null) && (this.msgbase.is_open))
		this.msgbase.close();

	// Perform the message scan
	this.doingMsgScan = true;
	var continueNewScan = true;
	var userAborted = false;
	if (scanScopeChar == "A") // All sub-board scan
	{
		this.doingMultiSubBoardScan = true;
		// Iterate through all message groups & sub-boards looking for ones with unread
		// messages.  When a sub-board with unread messages is found, then let the user
		// read messages in that sub-board.
		for (var grpIndex = 0; (grpIndex < msg_area.grp_list.length) && continueNewScan; ++grpIndex)
		{
			// Group description: msg_area.grp_list[grpIndex].description
			// Iterate through the sub-boards in this message group looking for unread messages
			for (var subIndex = 0; (subIndex < msg_area.grp_list[grpIndex].sub_list.length) && continueNewScan; ++subIndex)
			{
				// Set the console line counter to 0 to prevent screen pausing
				// when the "Searching ..." and "No messages were found" text is
				// displayed repeatedly
				console.line_counter = 0;
				// If the sub-board's access requirements allows the user to read it
				// and it's enabled in the user's message scan configuration, then go
				// ahead with this sub-board.
				// Note: Used to use this to determine whether the user could access the
				// sub-board:
				//user.compare_ars(msg_area.grp_list[grpIndex].sub_list[subIndex].ars)
				// Now using the can_read property.
				this.setSubBoardCode(msg_area.grp_list[grpIndex].sub_list[subIndex].code); // Needs to be set before getting the last read/scan pointer index
				if (msg_area.sub[this.subBoardCode].can_read &&
				    ((msg_area.sub[this.subBoardCode].scan_cfg & pScanCfgOpt) == pScanCfgOpt))
				{
					// Sub-board description: msg_area.grp_list[grpIndex].sub_list[subIndex].description
					// Open the sub-board and check for unread messages.  If there are any, then let
					// the user read the messages in the sub-board.
					//this.msgbase = new MsgBase(msg_area.grp_list[grpIndex].sub_list[subIndex].code);
					this.msgbase = new MsgBase(this.subBoardCode);
					if (this.msgbase.open())
					{
						//this.setSubBoardCode(msg_area.grp_list[grpIndex].sub_list[subIndex].code); // Needs to be set before getting the last read/scan pointer index

						// If the current sub-board contains only deleted messages,
						// then skip it.
						var scanPtrMsgIdx = this.GetScanPtrMsgIdx();
						var nonDeletedMsgsExist = (this.FindNextNonDeletedMsgIdx(scanPtrMsgIdx-1, true) > -1);
						if (!nonDeletedMsgsExist)
						{
							if (this.msgbase != null)
								this.msgbase.close();
							continue;
						}

						// In the switch cases below, bbs.curgrp and bbs.cursub are
						// temporarily changed the user's sub-board to the current
						// sub-board so that certain @-codes (such as @GRP-L@, etc.)
						// are displayed by Synchronet correctly.

						// We might want the starting message index to be different
						// depending on the scan mode.
						switch (pScanMode)
						{
							case SCAN_NEW:
								// Make sure the sub-board has some messages.  Let the user read it if
								// the scan pointer index is -1 (one unread message) or if it points to
								// a message within the number of messages in the sub-board.
								if ((this.msgbase.total_msgs > 0) && ((scanPtrMsgIdx == -1) || (scanPtrMsgIdx < this.msgbase.total_msgs-1)))
								{
									bbs.curgrp = grpIndex;
									bbs.cursub = subIndex;
									// Start at the first unread message.
									var startMsgIdx = scanPtrMsgIdx + 1;
									if (this.SearchingAndResultObjsDefinedForCurSub())
										startMsgIdx = 0;
									// Allow the user to read messages in this sub-board.  Don't allow
									// the user to change to a different message area, don't pause
									// when there's no search results in a sub-board, and return
									// instead of going to the next sub-board via navigation.
									var readRetObj = this.ReadOrListSubBoard(null, startMsgIdx, false, true, false);
									// If the user stopped reading & decided to quit, then exit the
									// message scan loops.
									if (readRetObj.stoppedReading)
									{
										continueNewScan = false;
										userAborted = true;
									}
								}
								break;
							case SCAN_TOYOU: // All messages to the user
								bbs.curgrp = grpIndex;