Public/Imported/Write-Calendar.ps1
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function Write-Calendar { <# .SYNOPSIS Writes out calendar elements, either a single month or an entire year depending on the inputs. .PARAMETER Month If specified, will limit output to a single month with this numeral value. .PARAMETER Year If specified, will output an entire year. .PARAMETER ShowHolidays If specified, holidays for the year and month are shown. .PARAMETER ObservedHolidays If specified with the ShowHolidays flag, observed holidays will be shown instead of the actual dates. .PARAMETER $DateColors A [ConsoleColor] array of two elements specifying the foreground color and background color for each day printed .PARAMETER $TodayColors A [ConsoleColor] array of two elements specifying the foreground color and background color for today's date .PARAMETER $HolidayColors A [ConsoleColor] array of two elements specifying the foreground color and background color for holidays printed .NOTES https://github.com/krispharper/Powershell-Scripts/blob/master/Write-Calendar.ps1 This script has some functionality which many would consider weird or inconsistent. Specifically, if a month is specifed and a year is not, then the output is typically the calendar for the input month and the current year. However, if the specified month is greater than 12, then it's treated as a year and the whole year is outputted. The reason for this is to emulate the *NIX cal function, which behaves similarly. That is, cal outputs the current month, cal 2012 outpus the calendar for 2012 and cal 05 2012 outputs the calendar for May 2012. That is pretty much how Write-Calendar works with the exception that Write-Calendar 05 will write out the calendar for May of the current year whereas cal will output the calendar for the year 5. Since the point of this script is to emulate cal's functionality I will probably not change it to make it more consistent. .EXAMPLE Write-Calendar Outputs the current month. .EXAMPLE Write-Calendar 2013 Outputs the calendar for 2013. .EXAMPLE Write-Calendar 04 2011 Outputs the calendar for April, 2011. .EXAMPLE Write-Calendar 7 Outputs the calendar for September of this year. #> param ( [int] $Month = (Get-Date).Month, [int] $Year = (Get-Date).Year, [switch] $ShowHolidays, [switch] $ObservedHolidays, [ConsoleColor[]] $DateColors = @([ConsoleColor]::White, [Console]::BackgroundColor), [ConsoleColor[]] $TodayColors = @([ConsoleColor]::Red, [Console]::BackgroundColor), [ConsoleColor[]] $HolidayColors = @([ConsoleColor]::White, [ConsoleColor]::DarkCyan) ) Set-Variable -name daysLine -option Constant -value "Su Mo Tu We Th Fr Sa " if ($year -lt 0) { throw "Year parameter must be greater than 0" } if ($month -lt 0) { throw "Month parameter must be between 1 and 12" } if (($month -gt 12) -and ($year -eq (Get-Date).Year)) { $year = $month $month = 0 } elseif (($month -gt 12) -and ($year -ne (Get-Date).Year)) { throw "Month parameter must be between 1 and 12" } foreach ($array in @($DateColors, $TodayColors, $HolidayColors)) { if ($array.Length -lt 2) { throw "Must specify both foreground and background colors for color parameters" } } function Print-Month ($month, $year) { $firstDayOfMonth = Get-Date -month $month -day 1 -year $year $lastDayOfMonth = (Get-Date -month $firstDayOfMonth.AddMonths(1).Month -day 1 -year $firstDayOfMonth.AddMonths(1).Year).AddDays(-1) $header = (Get-Date $firstDayOfMonth -Format MMMM) + " " + $firstDayOfMonth.Year Write-Host Write-Host ((" " * (($daysLine.Length - $header.Length) / 2)) + $header) Write-Host $daysLine for ($day = $firstDayOfMonth; $day -le $lastDayOfMonth; $day = $day.AddDays(1)) { $ForegroundColor = $DateColors[0] $BackgroundColor = $DateColors[1] if ($day.date -eq (get-date).date) { $ForegroundColor = $TodayColors[0] $BackgroundColor = $TodayColors[1] } elseif ($ShowHolidays.IsPresent) { if ((Get-Holidays $year).Contains($day.Date)) { $ForegroundColor = $HolidayColors[0] $BackgroundColor = $HolidayColors[1] } } if ($day.day -eq 1) { Write-Host (" " * 3 * [int](Get-Date $day -uformat %u)) -NoNewLine } Write-Host ((Get-Date $day -Format dd).ToString()) -NoNewLine -ForegroundColor $ForegroundColor -BackgroundColor $BackgroundColor Write-Host " " -NoNewLine if ($day.DayOfWeek -eq "Saturday") { Write-Host } } if ($lastDayOfMonth.DayOfWeek -ne "Saturday") { Write-Host } Write-Host } function Print-Year ($year) { if ($ShowHolidays.IsPresent) { $holidays = Get-Holidays $year } Write-Host for ($month = 1; $month -le 12; $month += 3) { $header = "" for ($i = $month; $i -lt $month + 3; $i++) { $tempHeader = (Get-Date -month $i -Format MMMM) + " " + $year.ToString() $header += ((" " * (($daysLine.Length - $tempHeader.Length) / 2)) + $tempHeader + (" " * (($daysLine.Length - $tempHeader.Length) / 2))) $header += " " } Write-Host $header Write-Host (($daysLine + " ") * 3) $dayCounts = (1, 1, 1) $i = 0 while ($dayCounts[0] -le (Get-Date -day 1 -month ($month + 1) -year $year).AddDays(-1).day -or ` $dayCounts[1] -le (Get-Date -day 1 -month ($month + 2) -year $year).AddDays(-1).day -or ` $dayCounts[2] -le (Get-Date -day 1 -month (($month + 3) % 12) -year $year).AddDays(-1).day) { $dayOfMonth = $dayCounts[$i] $dayCounts[$i]++ $dayOffset = [int](Get-Date -day 1 -month ($month + $i) -year $year -uformat %u) $ForegroundColor = $DateColors[0] $BackgroundColor = $DateColors[1] if ($dayOfMonth -eq 1) { Write-Host (" " * 3 * $dayOffSet) -NoNewLine } if ($dayOfMonth -le (Get-Date -day 1 -month ((($i + $month) % 12) + 1) -year $year).AddDays(-1).day) { $currentDay = (Get-Date -day $dayOfMonth -month ((($i + $month - 1) % 12) + 1) -year $year) if ($currentDay.date -eq (Get-Date).date) { $ForegroundColor = $TodayColors[0] $BackgroundColor = $TodayColors[1] } elseif ($ShowHolidays.IsPresent) { if ($holidays.Contains($currentDay.Date)) { $ForegroundColor = $HolidayColors[0] $BackgroundColor = $HolidayColors[1] } } Write-Host ((Get-Date -month ($i + $month) -day $dayOfMonth -year $year -Format dd).ToString()) -NoNewLine -ForegroundColor $ForegroundColor -BackgroundColor $BackgroundColor Write-Host " " -NoNewLine } else { Write-Host " " -NoNewLine } if ((($dayOfMonth + $dayOffset) % 7) -eq 0) { $i = ($i + 1) % 3 Write-Host " " -NoNewLine if ($i -eq 0) { Write-Host } } } Write-Host $dayCounts = (1, 1, 1) } } function Get-Holiday ($year) { $holidays = @( Get-Date -Year $year -Month 1 -Day 1 # New Year's Day Find-WeekDayMultiple $year 1 "Monday" 3 # MLK Day Find-WeekDayMultiple $year 2 "Monday" 3 # President's Day Find-GoodFriday $year # Good Friday Find-LastWeekDay $year 5 "Monday" # Memorial Day Get-Date -Year $year -Month 7 -Day 4 # Fourth of July Find-WeekDayMultiple $year 9 "Monday" 1 # Labor Day Find-WeekDayMultiple $year 10 "Monday" 2 # Columbus Day Get-Date -Year $year -Month 11 -Day 11 # Veterans Day Find-WeekDayMultiple $year 11 "Thursday" 4 # Thanksgiving Get-Date -Year $year -Month 12 -Day 25 # Christmas ) | ForEach-Object { $_.Date } if ($ObservedHolidays.IsPresent) { return $holidays | ForEach-Object { Find-ObservedHoliday $_ } } else { return $holidays } } function Find-WeekDayMultiple ($year, $month, $dayOfWeek, $multiple) { $result = Get-Date -Year $year -Month $month -Day 1 $multipleCount = 0 do { if ($result.DayOfWeek -eq $dayOfWeek) { $multipleCount++ } $result = $result.AddDays(1) if ($result.Month -ne $month) { throw "Could not find weekday multiple." } } while ($multipleCount -lt $multiple) return $result.AddDays(-1) } function Find-LastWeekDay ($year, $month, $dayOfWeek) { $result = $dayCounter = Get-Date -Year $year -Month $month -Day 1 while ($dayCounter.Month -eq $month) { if ($dayCounter.DayOfWeek -eq $dayOfWeek) { $result = $dayCounter } $dayCounter = $dayCounter.AddDays(1) } return $result } function Find-GoodFriday ($year) { # Taken from http://en.wikipedia.org/wiki/Computus#Anonymous_Gregorian_algorithm $a = $year % 19 $b = [Math]::Floor($year / 100) $c = $year % 100 $d = [Math]::Floor($b / 4) $e = $b % 4 $f = [Math]::Floor(($b + 8) / 25) $g = [Math]::Floor(($b - $f + 1) / 3) $h = (19 * $a + $b - $d - $g + 15) % 30 $i = [Math]::Floor($c / 4) $k = $c % 4 $L = (32 + 2 * $e + 2 * $i - $h - $k) % 7 $m = [Math]::Floor(($a + 11 * $h + 22 * $L) / 451) $month = [Math]::Floor(($h + $L - 7 * $m + 114) / 31) $day = (($h + $L - 7 * $m + 114) % 31) + 1 return (Get-Date -Year $year -Month $month -Day $day).AddDays(-2) } function Find-ObservedHoliday ($holiday) { if ($holiday.DayOfWeek -eq "Saturday") { return $holiday.AddDays(-1) } elseif ($holiday.DayOfWeek -eq "Sunday") { return $holiday.AddDays(1) } else { return $holiday } } if ($month -ne 0) { Print-Month $month $year } else { Print-Year $year } } |