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annotate modules/utils.js @ 322:3940ef5aa170

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let users choose a period of time from which to see messages in the river view
author Myk Melez <myk@mozilla.org>
date Tue, 14 Oct 2008 11:34:46 -0700
parents b09b7f436e1a
children 3a8dfaf1ac31
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1 /* ***** BEGIN LICENSE BLOCK *****
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2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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3 *
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4 * The contents of this file are subject to the Mozilla Public License Version
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5 * 1.1 (the "License"); you may not use this file except in compliance with
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6 * the License. You may obtain a copy of the License at
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7 * http://www.mozilla.org/MPL/
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8 *
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9 * Software distributed under the License is distributed on an "AS IS" basis,
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10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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11 * for the specific language governing rights and limitations under the
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12 * License.
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13 *
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14 * The Original Code is Snowl.
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15 *
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16 * The Initial Developer of the Original Code is Mozilla.
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17 * Portions created by the Initial Developer are Copyright (C) 2008
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18 * the Initial Developer. All Rights Reserved.
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19 *
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20 * Contributor(s):
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21 * Myk Melez <myk@mozilla.org>
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22 *
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23 * Alternatively, the contents of this file may be used under the terms of
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24 * either the GNU General Public License Version 2 or later (the "GPL"), or
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25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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26 * in which case the provisions of the GPL or the LGPL are applicable instead
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27 * of those above. If you wish to allow use of your version of this file only
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28 * under the terms of either the GPL or the LGPL, and not to allow others to
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29 * use your version of this file under the terms of the MPL, indicate your
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30 * decision by deleting the provisions above and replace them with the notice
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31 * and other provisions required by the GPL or the LGPL. If you do not delete
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32 * the provisions above, a recipient may use your version of this file under
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33 * the terms of any one of the MPL, the GPL or the LGPL.
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34 *
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35 * ***** END LICENSE BLOCK ***** */
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36
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37 const EXPORTED_SYMBOLS = ["SnowlUtils"];
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38
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39 const Cc = Components.classes;
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40 const Ci = Components.interfaces;
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41 const Cr = Components.results;
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42 const Cu = Components.utils;
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43
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44 let msInDay = (1000 * 60 * 60 * 24);
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45
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46 let SnowlUtils = {
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47 jsToJulianDate: function(date) {
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48 // Divide by 1000 to get seconds since Unix epoch, divide by 86400
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49 // to get days since Unix epoch, add the difference between the Unix epoch
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50 // and the Julian epoch.
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51 return date.getTime() / 1000 / 86400 + 2440587.5;
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52 },
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53
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54 julianToJSDate: function(date) {
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55 // Invert the function in jsToJulianDate, but round its result before
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56 // constructing a Date object, as the Date object would truncate (floor)
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57 // the non-integer result of the calculation, potentially resulting in
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58 // an off-by-one error.
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59 return new Date(Math.round((date - 2440587.5) * 86400 * 1000));
263
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60 },
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61
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62 // Date Formatting Service
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63 get _dfSvc() {
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64 delete this._dfSvc;
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65 return this._dfSvc = Cc["@mozilla.org/intl/scriptabledateformat;1"].
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66 getService(Ci.nsIScriptableDateFormat);
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67 },
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68
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69 // FIXME: make this localizable.
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70 days: {
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71 0: "Sunday",
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72 1: "Monday",
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73 2: "Tuesday",
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74 3: "Wednesday",
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75 4: "Thursday",
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76 5: "Friday",
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77 6: "Saturday"
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78 },
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79
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80 get today() {
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81 let sometimeToday = new Date();
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82 return new Date(sometimeToday.getFullYear(),
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83 sometimeToday.getMonth(),
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84 sometimeToday.getDate());
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85 },
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86
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87 // FIXME: accommodate daylight savings time, which could cause
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88 // these calculations to be incorrect at times.
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89
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90 get tomorrow() {
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91 let sometimeTomorrow = new Date(new Date() + (1000 * 60 * 60 * 24));
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92 return new Date(sometimeTomorrow.getFullYear(),
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93 sometimeTomorrow.getMonth(),
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94 sometimeTomorrow.getDate());
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95 },
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96
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97 get yesterday() {
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98 let sometimeYesterday = new Date(new Date() - (1000 * 60 * 60 * 24));
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99 return new Date(sometimeYesterday.getFullYear(),
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100 sometimeYesterday.getMonth(),
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101 sometimeYesterday.getDate());
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102 },
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103
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104 twoDaysAgo: {
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105 get epoch() { return new Date(SnowlUtils.today - (msInDay * 2)) },
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106 get name() { return SnowlUtils.days[this.epoch.getDay()] }
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107 },
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108
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109 threeDaysAgo: {
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110 get epoch() { return new Date(SnowlUtils.today - (msInDay * 3)) },
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111 get name() { return SnowlUtils.days[this.epoch.getDay()] }
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112 },
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113
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114 fourDaysAgo: {
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115 get epoch() { return new Date(SnowlUtils.today - (msInDay * 4)) },
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116 get name() { return SnowlUtils.days[this.epoch.getDay()] }
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117 },
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118
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119 fiveDaysAgo: {
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120 get epoch() { return new Date(SnowlUtils.today - (msInDay * 5)) },
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121 get name() { return SnowlUtils.days[this.epoch.getDay()] }
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122 },
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123
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124 sixDaysAgo: {
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125 get epoch() { return new Date(SnowlUtils.today - (msInDay * 6)) },
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126 get name() { return SnowlUtils.days[this.epoch.getDay()] }
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127 },
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128
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129 twentyNineDaysAgo: {
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130 get epoch() { return new Date(SnowlUtils.today - (msInDay * 29)) },
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131 get name() { return "Twenty Nine Days Ago" }
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132 },
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133
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134 /**
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135 * Formats a date for human consumption using the date formatting service
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136 * for locale-specific formatting along with some additional smarts for more
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137 * human-readable representations of recent dates.
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138 * @param date {Date} the date to format
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139 * @returns a human-readable string representing the date
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140 */
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141 _formatDate: function(date) {
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142 let day = new Date(date.getFullYear(), date.getMonth(), date.getDate());
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143 let now = new Date();
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144 let today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
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145
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146 let yesterday = this.yesterday;
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147
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148 let sixDaysAgo = new Date(now - 1000 * 60 * 60 * 24 * 6);
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149 sixDaysAgo = new Date(sixDaysAgo.getFullYear(),
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150 sixDaysAgo.getMonth(),
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151 sixDaysAgo.getDate());
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152
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153 // If it's in the future or more than six days in the past, format it
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154 // as a full date/time string, i.e.: 2008-05-13 15:37:42.
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155 if (day > today || day < sixDaysAgo)
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156 return this._dfSvc.FormatDateTime("",
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157 Ci.nsIScriptableDateFormat.dateFormatShort,
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158 Ci.nsIScriptableDateFormat.timeFormatNoSeconds,
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159 date.getFullYear(),
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160 date.getMonth() + 1,
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161 date.getDate(),
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162 date.getHours(),
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163 date.getMinutes(),
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164 date.getSeconds());
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165
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166 // If it's today, only show the time.
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167 if (day.getTime() == today.getTime())
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168 return this._dfSvc.FormatTime("",
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169 Ci.nsIScriptableDateFormat.timeFormatNoSeconds,
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170 date.getHours(),
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171 date.getMinutes(),
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172 null);
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173
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174 // If it's yesterday, show "Yesterday" plus the time.
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175 // FIXME: make this localizable.
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176 if (day.getTime() == yesterday.getTime())
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177 return "Yesterday " +
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178 this._dfSvc.FormatTime("",
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179 Ci.nsIScriptableDateFormat.timeFormatNoSeconds,
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180 date.getHours(),
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181 date.getMinutes(),
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182 null);
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183
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184 // It's two to six days ago, so show the day of the week plus the time.
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185 return this._dfSvc.FormatDateTime("",
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186 Ci.nsIScriptableDateFormat.dateFormatWeekday,
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187 Ci.nsIScriptableDateFormat.timeFormatNoSeconds,
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188 date.getFullYear(),
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189 date.getMonth() + 1,
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190 date.getDate(),
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191 date.getHours(),
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192 date.getMinutes(),
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193 date.getSeconds());
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194 }
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195
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196 };