/*
$Author: tom $
$Date: 2004/02/08 01:42:42 $
$Log: common.js,v $
Revision 1.1  2004/02/08 01:42:42  tom
- bug fixes; calendar_nav() now resets addTrailVbar to default automatically

Revision 1.0  2004/02/08 00:58:17  tom
Initial revision

*/

/* Copyright (C) 2003 tom rothschild for five-space studios */
var start_yr = 1996;

// define new Date() properties
// leave commented-out: 'prototype' keyword crashes Konqueror

/*
 * Date.prototype.getAbbrevYear = function() {
 * var y = String(this.getFullYear());
 * // substring -- strings indices are implemented as zero-based arrays
 * return y.substring(2);
 * }
 */

// leave commented-out: see above
/* Date.prototype.getAbbrevYear = getAbbrevYear; */

var date = new Date();

// 4-digit year
var cal_prefix, cal_suffix, current_yr, yyyy;

yyyy = date.getFullYear();
// calendar-page naming conventions
cal_prefix = "tch";
cal_suffix = "html";
/* when calendar pages have php, change the file suffix */
// cal_suffix = "php";

/* default values */
var addTrailVbar = false;
var isCalendar = false;

/* determine whether document is a calendar page and set variables
    accordingly */
//var url_path = document.URL;
var url_path = location.pathname;
// base name of the url (the file name without the path info)
var base_name = url_path.substring(url_path.lastIndexOf("/") + 1);
// the title
var title = document.title;

/* Attempt to determine if document is a calendar page and set
    booleans */
var pattern = /\d{2,4}/;

// Does the file name of the page contain a 2- or 4-digit year? If the
// page was called by a symlink called "programming" or somesuch, it
// may not.
hasYearInFileName = pattern.test(base_name);

// Does the page have a year in its title?
hasYearInTitle = pattern.test(title);

// extract calendar year from title
// Ensure all calendar pages have a four-digit, _not_ two-digit, year
// in their 'title' elements
doc_year = title.match(/\d{4}/);

/* calendar_nav() writes out navigation links to the calendar pages */
function calendar_nav() 
{
    var yr, str_ent_pipe, str_current, calendar_folder;
    // define the html vertical bar (pipe) entity
    str_ent_pipe = "|";
    // path info for calendar page urls
    calendar_folder = "calendar";
    
/* for each year, write out a link or the year with no link depending on what
   page is calling this script */
 for (yr = yyyy; yr >= start_yr; yr--) {
     /* for non calendar pages, link to current programming gets
	supplementary text around it, otherwise it's empty */
     (yr == yyyy) ? str_current = "Programming" : str_current = "";

     // extract last 2 digits of 4-digit year
     var yy = String(yr).substring(2);
     var anchor_start_tag = '<a href="' + cal_prefix + yy + "." + cal_suffix + '">';
     var link_item, strNavItem;

    /* TO DO: allow caller to write the pipe char after the final
       calendar link if desired */

     // CASE: if we're writing to calendar page
     if(hasYearInTitle || hasYearInFileName) {
	 // don't create an anchor link to calling document
	 (doc_year == yr) ? link_item = yr : link_item = anchor_start_tag + yr + "</a>";
	 // Omit the vertical bar to the final link if addTrailVbar is true
	 addTrailVbar ? str_optional_vbar = " " + str_ent_pipe : str_optional_vbar = "";
	 (yr != start_yr) ? strNavItem = " " + link_item + " " + str_ent_pipe : strNavItem = " " + link_item + str_optional_vbar;
	 document.writeln(strNavItem);
     }
     // CASE: not a calendar page
     // recall that str_current is null unless we're linking to current year
     else {
	 document.write(" " + anchor_start_tag + yr +  "</a>" + " " + str_current + " " + str_ent_pipe);
     }
     
/* uncomment the following code when calendar pages are
   moved/renamed to './calendar/YYYY.html', where YYYY is a
   4-digit year */
// anchor_start_tag = "<a href=" + calendar_folder + "/" + yyyy + "." + cal_suffix + "> ";
 }

 // before exiting, reset addTrailVbar to global value
 addTrailVbar = false;
}


/* handle buggy Konqueror javascript interpreter */

// default value
var is_konqueror = false;

// test for konqueror and toggle boolean 
if(navigator.appName == "Konqueror") is_konqueror = true;

function konq_support_warning() {
    var str, idx, browser;
// get rid of those unsightly parentheses
// first, the closing paren
    str = navigator.appVersion.replace(/\)/, "");
// now the opening paren
    str = str.replace(/\(/, "");
// extract the substring that begins with 'Konqueror'
    idx = str.indexOf("K");
    browser = str.substring(idx);
    var warning = browser + " is not fully supported by this site."  + "\nConsider disabling javascript or using a different browser here.";
    return warning;
}

if (is_konqueror) {
    alert(konq_support_warning())
}


/*
Local Variables:
mode:C
tab-stop-list: (4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72)
End:
*/