photo-utils.ps1

photo-utils.ps1

[reflection.assembly]::loadfile( "C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.Drawing.dll")

function BytesToString($bytes) {
    return [System.Text.Encoding]::ASCII.GetString($bytes)
}
function StringToBytes($string) {
    return [System.Text.Encoding]::ASCII.GetBytes($string)
}

function GetImageTakenDate($filename) {
    # https://blogs.technet.microsoft.com/jamesone/2007/07/13/exploring-photographic-exif-data-using-powershell-of-course/
    $resolvedFilename = (Resolve-Path $filename).Path
    try {
        $image = New-Object -TypeName system.drawing.bitmap -ArgumentList $resolvedFilename
        $item = $image.GetPropertyItem(36867)
    }
    finally {
        $image.Dispose()
    }

    $takenString = BytesToString $item.Value
    $takenDate = [DateTime]::ParseExact($takenString, "yyyy:MM:dd HH:mm:ss`0", [System.Globalization.CultureInfo]::InvariantCulture)
    return $takenDate
}

function SetImageTakenDate($filename, $newDate) {

    $resolvedFilename = (Resolve-Path $filename).Path
    $image = New-Object -TypeName system.drawing.bitmap -ArgumentList $resolvedFilename

    $newDateString = $newDate.ToString("yyyy:MM:dd HH:mm:ss`0")
    $newValue = StringToBytes $newDateString

    $item = $image.GetPropertyItem(36867)

    $item.Value = $newValue

    $image.SetPropertyItem($item)

    $image.Save("$resolvedFilename.new")

    $image.Dispose()

    Remove-Item -Path $resolvedFilename
    Rename-Item -Path "$resolvedFilename.new" -NewName $resolvedFilename -Force
}
function ShiftImageTakenDate($filename, [Timespan] $timespan) {
    $resolvedFilename = (Resolve-Path $filename).Path

    $date = GetImageTakenDate $filename
    $newDate = $date + $timespan
    SetImageTakenDate $filename $newDate    
}
function SortIntoPathsByDate($SourcePath) {
    # Perform in-place organisation
    if (-not $SourcePath.EndsWith("\")) {
        $SourcePath += "\"
    }
    Get-ChildItem $SourcePath -Recurse -File `
            | ForEach-Object -Process { 
        $currentFile = $_
        try {
            $PictureTime = GetImageTakenDate $currentFile.FullName
        }
        catch {
            $PictureTime = $currentFile.LastWriteTime            
        }
        $DestinationPath = $SourcePath + $PictureTime.ToString("yyyy\\yyyy_MM_dd")
        $DestinationName = $DestinationPath + "\" + $currentFile.Name
        if ((Test-Path $DestinationName)) {
            Write-Output "Skipping $DestinationName - already exists"
        }
        else {
            if (!(Test-Path $DestinationPath)) {
                mkdir $DestinationPath | out-null
            }
            else {
                Write-Output "Moving $($currentFile.FullName) to $DestinationName" 
                Move-Item  $currentFile.FullName $DestinationName
            } 
        }
    }
}

function demo() {
    # adjust date in jpg files
    $startDate = get-date -Year 2017 -Month 01 -Day 22
    $endDate = get-date -Year 2017 -Month 02 -day 24
    $diff = $endDate - $startDate

    Get-Item .\_emmobpics\*20170122*.jpg | `
        ForEach-Object {
        ShiftImageTakenDate $_.FullName $diff
    }

    # rename files
    Get-Item .\_emmobpics\*20170122*.jpg | `
        ForEach-Object {
        Move-Item $_.FullName $($_.FullName.Replace("20170122", "20170224"))
    }
}
function demo2() {
    # adjust date in jpg files
    $startDate = get-date -Year 2016 -Month 05 -Day 23 -Hour 15 -Minute 46
    $endDate = get-date -Year 2016 -Month 12 -day 13 -Hour 09 -Minute 12
    $diff = $endDate - $startDate

    Get-Item .\_emmobpics.2\*20160523*.jpg | `
        ForEach-Object {
        ShiftImageTakenDate $_.FullName $diff
    }

    # rename files
    Get-Item .\_emmobpics.2\*20160523*.jpg | `
        ForEach-Object {
        Move-Item $_.FullName $($_.FullName.Replace("20160523", "20161213"))
    }
}
$ErrorActionPreference = "Stop"

# remove empty dirs:
# get-childitem -Directory | ?{ (Get-ChildItem $_.FullName | Measure-Object).Count -eq 0 } | remove-item