functions/public.ps1


# http://www.leeholmes.com/blog/2008/12/03/showing-calendars-in-your-oof-messages/

Function Get-Calendar {

    [cmdletbinding(DefaultParameterSetName = "month")]
    [OutputType([System.String])]
    [Alias("cal")]

    Param(
        [Parameter(Position = 1, ParameterSetName = "month")]
        [ValidateNotNullorEmpty()]
        [ValidateScript( {
                $names = _getMonthsByCulture
                if ($names -contains $_) {
                    $True
                }
                else {
                    Throw "You entered an invalid month. Valid choices are $($names -join ',')"
                    $False
                }
            })]
        [string]$Month = (Get-Date -format MMMM),

        [Parameter(Position = 2, ParameterSetName = "month")]
        [ValidatePattern('^\d{4}$')]
        [int]$Year = (Get-Date).Year,

        [Parameter(Mandatory, HelpMessage = "Enter the start of a month like 1/1/2020 that is correct for your culture.", ParameterSetName = "span")]
        [ValidateNotNullOrEmpty()]
        [string]$Start,

        [Parameter(Mandatory, HelpMessage = "Enter an ending date for the month like 3/1/2020 that is correct for your culture.", ParameterSetName = "span")]
        [ValidateNotNullOrEmpty()]
        [ValidateScript( {
                if ($_ -ge $Start) {
                    $True
                }
                else {
                    Throw "The end date ($_) must be later than the start date ($start)"
                    $False
                }
            })]
        [string]$End,

        [Parameter(HelpMessage = "Specify a collection of dates to highlight in the calendar display.")]
        [ValidateNotNullorEmpty()]
        [string[]]$HighlightDate
    )

    Begin {
        #display the module version defined in the psm1 file
        Write-Verbose "Starting $($myinvocation.MyCommand) [v$modver]"
        Write-Verbose "Using PowerShell version $($psversiontable.PSVersion)"
        #Call .NET for better results when testing this command in different cultures
        $currCulture = [system.globalization.cultureinfo]::CurrentCulture
    }
    Process {
        Write-Verbose "Using parameter set: $($pscmdlet.ParameterSetName)"
        Write-Verbose "Using culture: $($currculture.displayname) [$($currCulture.name)]"
        Write-Verbose "Using PSBoundParameters:"
        Write-Verbose ($PSBoundParameters | Out-String).trim()
        Write-Verbose "Getting start date using pattern $($currCulture.DateTimeFormat.ShortDatePattern)"

        if ($pscmdlet.ParameterSetName -eq "month") {
            Write-Verbose "Using month $month and year $year"

            #get month number
            Write-Verbose "Parsing $month to number"
            $monthint = [datetime]::parse("1 $month $year").month
            Write-Verbose "Returned month number $monthint"
            $startd = [datetime]::new($year, $monthint, 1)

            $endd = $startd.date
        }
        else {
            #Figure out the first day of the start and end months
           # Write-Verbose "Calculating start from month $($start.month) year $($start.year)"
           # $start = [datetime]::new($start.year, $start.Month, 1)
           Write-Verbose "Treating $start as [datetime]"
            $startd = $start -as [datetime]
          # Write-Verbose "Calculating end from month $($end.month) year $($end.year)"
            # $end = [datetime]::new($end.year, $end.month, 1)
            Write-Verbose "Treating $end as [datetime]"
            $endd = $end -as [datetime]
        }

        Write-Verbose "Starting at $($startd.toString())"
        Write-Verbose "Ending at $($Endd.ToString())"

        #$highstring = $HighlightDate.foreach({$_.ToString()})
        Write-Verbose "Highlighting: $($highlightdate-join ',')"

        Write-Verbose "Go through the requested months."
        while ($startd -le $endd) {
            Write-Verbose "Looping from $($startd.DateTime)"
            _getCalendar -start $Startd -highlightDates $highlightDate

            #And now move onto the next month
            $startd= $startd.AddMonths(1)
        }
    } #process

    End {
        Write-Verbose "Ending $($myinvocation.MyCommand)"
    }
} #end Get-Calendar


#display a colorized calendar in the console


#create a WPF-based calendar
Function Show-GuiCalendar {
    [cmdletbinding()]
    [OutputType("None")]
    [Alias("gcal")]

    Param(
        [Parameter(Position = 1, HelpMessage = "Enter the first month to display by date, like 1/1/2019.")]
        [ValidateNotNullOrEmpty()]
        [string]$Start = (Get-date -format d),

        [Parameter(Position = 2, HelpMessage = "Enter the last month to display by date, like 3/1/2019. You cannot display more than 3 months.")]
        [ValidateNotNullOrEmpty()]
        [ValidateScript( {
                if ( ($_ -as [datetime]) -ge ($Start -as [datetime])) {
                    $True
                }
                else {
                    Throw "The end date ($_) must be later than the start date ($start)"
                    $False
                }
            })]
        [string]$End = (Get-Date -format d),

        [Parameter(HelpMessage = "Enter an array of dates to highlight like 12/25/2019.")]
        [string[]]$HighlightDate,

        [Parameter(HelpMessage = "Select a font family for your calendar" )]
        [ValidateSet("Segoi UI", "QuickType", "Tahoma", "Lucida Console", "Century Gothic")]
        [string]$Font = "Segoi UI",

        [Parameter(HelpMessage = "Select a font style for your calendar." )]
        [ValidateSet("Normal", "Italic", "Oblique")]
        [string]$FontStyle = "Normal",

        [Parameter(HelpMessage = "Select a font weight for your calendar." )]
        [ValidateSet("Normal", "DemiBold", "Light", "Bold")]
        [string]$FontWeight = "Normal"
    )

    Write-Verbose "Starting $($myinvocation.MyCommand) [v$modver]"
    $currCulture = [system.globalization.cultureinfo]::CurrentCulture
    Write-Verbose "Using culture: $($currculture.displayname) [$($currCulture.name)]"
    Write-Verbose "Using PSBoundParameters:"
    Write-Verbose ($PSBoundParameters | Out-String).trim()
    Write-Verbose "Getting start date using pattern $($currCulture.DateTimeFormat.ShortDatePattern)"

    #add the necessary type library and bail out if there are errors which means the
    #platform lacks support for WPF

    Try {
        Add-Type -AssemblyName PresentationFramework -ErrorAction Stop
        Add-Type â€“AssemblyName PresentationCore -ErrorAction Stop
    }
    Catch {
        Write-Warning "Failed to load a required type library. Your version of PowerShell and or platform may not support WPF. $($_.exception.message)"
        #bail out of the command
        Return
    }

    $startd = $start -as [datetime]
    $endd = $end -as [datetime]
    Write-Verbose "Using start $startd"
    Write-Verbose "Using end $endd"
    $months = do {
        $startd
        $startd = $startd.AddMonths(1)
    } while ($startd -le $endd)

    Write-Verbose "Displaying $($months.count) months"
    if ($months.count -gt 3) {
        Write-Warning "You can't display more than 3 months at a time with this command."
        #bail out
        Return
    }

    $hl = Foreach ($item in $HighlightDate) {
        Write-Verbose "Treating $item as a datetime"
        $item -as [datetime]
    }
    #the title won't normally be seen but is set for development and test purposes
    $myParams = @{
        Months        = $months
        Height        = (200 * $months.count)
        Title         = "My Calendar"
        HighlightDate = $hl
        Font          = $Font
        FontStyle     = $FontStyle
        FontWeight    = $FontWeight
    }

    Write-Verbose "Using these parameters"
    $myparams | Out-String | Write-Verbose

    $newRunspace = [RunspaceFactory]::CreateRunspace()
    if ($newRunspace.ApartmentState) {
        $newRunspace.ApartmentState = "STA"
    }
    else {
        #This command probably won't run if the ApartmentState can't be set to STA
        #clean up
        $newRunspace.dispose()

        Write-Warning "Incompatible runspace detected. This command will most likely fail on this platform with this version of PowerShell."
        #bail out of the command
        return
    }
    $newRunspace.ThreadOptions = "ReuseThread"
    $newRunspace.Open()

    Write-Verbose "Defining runspace script"

    $psCmd = [PowerShell]::Create().AddScript( {

            Param (
                [datetime[]]$HighlightDate,
                [string]$Font,
                [string]$FontStyle,
                [string]$FontWeight,
                [int]$Height,
                [string]$Title,
                [datetime[]]$Months
            )

            #create a window form.
            $form = New-Object System.Windows.Window

            $form.AllowsTransparency = $True
            $form.WindowStyle = "none"
            #the title won't be shown when window style is set to none
            $form.Title = $Title
            $form.Height = $height
            $form.Width = 200

            $bg = New-Object System.Windows.Media.SolidColorBrush

            $form.Background = $bg
            #color is set for development purposes. It won't be seen normally.
            # $form.Background.Color = "green"
            # $form.background.Opacity = 0
            $form.ShowInTaskbar = $False
            $form.Add_Loaded( {
                    $form.Topmost = $True
                    $form.Activate()
                })

            $form.Add_MouseLeftButtonDown( { $form.DragMove() })

            #add event handlers to adjust opacity by using the +/- keys
            $form.add_KeyDown( {
                    switch ($_.key) {
                        { 'Add', 'OemPlus' -contains $_ } {
                            foreach ($cal in $myCals) {
                                If ($cal.Opacity -lt 1) {
                                    $cal.Opacity = $cal.opacity + .1
                                    $cal.UpdateLayout()
                                }
                            }
                        }
                        { 'Subtract', 'OemMinus' -contains $_ } {
                            foreach ($cal in $myCals) {
                                If ($cal.Opacity -gt .2) {
                                    $cal.Opacity = $cal.Opacity - .1
                                    $cal.UpdateLayout()
                                }
                            }
                        }
                    }
                })

            $stack = $stack = New-Object System.Windows.Controls.StackPanel
            $stack.Width = $form.Width
            $stack.Height = $form.Height
            $stack.HorizontalAlignment = "center"
            $stack.VerticalAlignment = "top"

            #create an array to store calendars so that opacity can be
            #set for multiple calendars in unison
            $myCals = @()
            foreach ($month in $months) {
                $cal = New-Object System.Windows.Controls.Calendar

                $cal.DisplayMode = "Month"

                <#
                notes for future development
                $calbg = new-object System.Windows.Media.ImageBrush
                $calbg.Opacity = "0.3"
                $calbg.ImageSource = "c:\scripts\zazu.gif"
                $cal.Background = $calbg
 
                $calbg = [System.Windows.Media.Brushes]::Aquamarine
                $cal.Background =$calbg
 
                #>

                $cal.Opacity = 1
                $cal.FontFamily = $font
                $cal.FontSize = 24
                $cal.FontWeight = $FontWeight
                $cal.FontStyle = $fontStyle

                $cal.DisplayDateStart = $month
                #added to allow display of past months
                $totaldays = [datetime]::DaysInMonth($month.year, $month.Month)
                $cal.DisplayDateEnd = $month.AddDays($totaldays - 1)

                $cal.HorizontalAlignment = "center"
                $cal.VerticalAlignment = "top"

                $cal.SelectionMode = "multipleRange"
                if ($highlightdate) {
                    foreach ($d in $HighlightDate) {
                        if ($d.month -eq $month.Month) {
                            $cal.SelectedDates.add($d)
                        }
                    }
                }

                $cal.add_DisplayDateChanged( {
                        # add the selected days for the currently displayed month
                        [datetime]$month = $cal.Displaydate
                        if ($highlightdate) {
                            foreach ($d in $HighlightDate) {
                                if ($d.month -eq $month.Month) {
                                    $cal.SelectedDates.add($d)

                                }
                            }
                        }
                        $cal.UpdateLayout()
                    })

                $stack.addchild($cal)
                $myCals += $cal
            } #foreach month

            $btn = New-Object System.Windows.Controls.Button
            $btn.Content = "_Close"
            $btn.Width = 75
            $btn.VerticalAlignment = "Bottom"
            $btn.HorizontalAlignment = "Center"
            $btn.Opacity = 1
            $btn.Add_click( {
                    $form.close()
                })

            $stack.AddChild($btn)

            $form.AddChild($stack)
            [void]$form.ShowDialog()
        }) #addScript

    [void]$psCmd.AddParameters($myparams)
    $psCmd.Runspace = $newRunspace
    Write-Verbose "Invoking calendar runspace"
    $handle = $psCmd.BeginInvoke()

    Write-Verbose "Creating ThreadJob"
    #calling a private, helper function which will clean up the runspace after the calendar is closed.
    $job = New-RunspaceCleanupJob -Handle $handle -PowerShell $pscmd -SleepInterval 30 -Passthru
    Write-Verbose "...Job Id $($job.id)"
    Write-Verbose "Ending $($myinvocation.mycommand)"

} #close Show-GuiCalendar

#region private functions

#a helper function to retrieve names


#endregion

Function Show-Calendar {

    [cmdletbinding()]
    [Alias("scal")]
    [OutputType("None")]

    Param(
        [Parameter(Position = 1, ParameterSetName = "month")]
        [ValidateNotNullorEmpty()]
        [ValidateScript( {
                $names = _getMonthsByCulture
                if ($names -contains $_) {
                    $True
                }
                else {
                    Throw "You entered an invalid month. Valid choices are $($names -join ',')"
                    $False
                }
            })]
        [string]$Month = (Get-Date -format MMMM),

        [Parameter(Position = 2, ParameterSetName = "month")]
        [ValidatePattern('^\d{4}$')]
        [int]$Year = (Get-Date).Year,

        [string[]]$HighlightDate,

        [System.Management.Automation.Host.Coordinates]$Position
    )

    Write-Verbose "Starting $($myinvocation.MyCommand) [v$modver]"

    #get culture to see how long the first day of week is
    #$currCulture = [system.globalization.cultureinfo]::CurrentCulture
    if ($position) {
        #save current cursor location
        $here = $host.ui.RawUI.CursorPosition
        [void]$PSBoundParameters.remove("Position")
    }

    #add default values if not bound
    $params = "Month", "Year"
    foreach ($param in $params) {
        if (-not $PSBoundParameters.ContainsKey($param)) {
            $PSBoundParameters.Add($param, $((Get-Variable -Name $param).value))
        }
    }

    $cal = Get-Calendar @PSBoundParameters

    if ($Position) {
        #turn the calendar into an array of lines
        $calArray = $cal.split("`n")
        foreach ($line in $calArray) {
            $host.ui.RawUI.CursorPosition = $Position
            Write-Host $line
            $position.y++
        }
        #set cursor position back
        $host.ui.RawUI.CursorPosition = $here
    }
    else {
        $cal
    }

    Write-Verbose "Ending $($myinvocation.mycommand)"

} #end Show-Calendar

Function Get-PSCalendarConfiguration {
    [cmdletbinding()]
     [outputType("PSCalendarConfiguration")]
    Param()

    Write-Verbose "Starting $($myinvocation.MyCommand) [v$modver]"
    if ($IsCoreCLR) {
        $e = '`e'
    }
    else {
        $e = '$([Char]0x1b)'
    }

    [pscustomobject]@{
        PSTypeName = "PSCalendarConfiguration"
        Title      = "$($pscalendarConfiguration.title){0}{1}$esc[0m" -f $e, $(($PSCalendarConfiguration.Title.ToCharArray() | Select-Object -skip 1 ) -join "")
        DayofWeek  = "$($pscalendarConfiguration.DayOfWeek){0}{1}$esc[0m" -f $e, $(($PSCalendarConfiguration.DayOfWeek.ToCharArray() | Select-Object -skip 1 ) -join "")
        Today      = "$($pscalendarConfiguration.Today){0}{1}$esc[0m" -f $e, $(($PSCalendarConfiguration.Today.ToCharArray() | Select-Object -skip 1 ) -join "")
        Highlight  = "$($pscalendarConfiguration.highlight){0}{1}$esc[0m" -f $e, $(($PSCalendarConfiguration.Highlight.ToCharArray() | Select-Object -skip 1 ) -join "")
    }
    Write-Verbose "Ending $($myinvocation.mycommand)"
}

function Set-PSCalendarConfiguration {
    [cmdletbinding(SupportsShouldProcess)]
    [outputType("None")]
    param (
        [string]$Title,
        [string]$DayOfWeek,
        [string]$Today,
        [string]$Highlight
    )

    Write-Verbose "Starting $($myinvocation.MyCommand) [v$modver]"
    $Settings = "Title", "DayofWeek", "Today", "Highlight"
    foreach ($setting in $Settings) {
        if ($PSBoundParameters.ContainsKey($setting) -AND $PSCmdlet.ShouldProcess($($Setting))) {
            Write-Verbose "Configuring $Setting"
            $PSCalendarConfiguration.$Setting = $PSBoundParameters[$Setting]
        } #if setting and should process

    } #foreach
    Write-Verbose "Ending $($myinvocation.mycommand)"
}