powershell - Translating OS X Bash Script for Windows

Question

I use Hedge to transfer Magic Lantern video files shot on my Canon 5D Mark III.

On OS X, I'm able to use Automator to set up a bash script, to execute an mlv_dump to transfer the files from MLV into cDNG sequences.

The script I use currently is:

cd "$(dirname "$1")"
for f in "$@"; do
    if [[ -f $f ]]; then
        filename=${f##*/};
        folder=${filename%.*}
        mkdir "${folder}";

        ~/mlv_dump --dng $f -o ${folder}/${folder}_;
    fi
done

Can this easily translate into a Windows equivalent?

Thanks,
Thomas

Answer 1

As with any translation between programming languages, there's (a) an as-literal-as-possible approach, which contrasts with (b), an not-immediately-obvious-but-in-the-spirit-of-the-target-language approach.
(b) is always preferable in the long run.

Use PowerShell, because it is the - far superior - successor to the "Command Prompt" (cmd.exe) and its batch files.
The code below is an attempt at (b), in PowerShell (v3+ syntax).

I encourage you to study the code and post an explanation of it in an answer of your own, so that others may benefit too.

To help with the analysis, consider the following resources:

• The official Windows PowerShell get-started page and the equivalent for PowerShell Core.

• This series of articles is a great, recipe-oriented introduction to PowerShell.

• http://hyperpolyglot.org/shell juxtaposes the syntax of POSIX-like shells such as bash with that of cmd.exe and PowerShell in concise, tabular form.

PowerShell-idiomatic translation of your code:

param(
  [Parameter(Mandatory, ValueFromRemainingArguments)]
  [System.IO.FileInfo[]] $LiteralPath
)

$outputBaseFolder = Split-Path -Parent $LiteralPath[0].FullName
foreach ($f in $LiteralPath) {
  if ($f.exists) {
    $outputFolder = Join-Path $outputBaseFolder $f.BaseName
    New-Item -ItemType Directory $outputFolder
    & "$HOME/mlv_dump" --dng $f.FullName -o "$outputFolder/$($f.BaseName)_"
  } else {
    Write-Warning "Item doesn't exist or is not a file: $($f.FullName)"
  }
}