sync from Linux

scripts/Rename-FilesWithZeroPadding.ps1

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+<#
+.SYNOPSIS
+Rename files with a specified extension in a folder, padding the numeric part with zeros.
+.PARAMETER ext
+The extension of the files to rename, without the dot. Default is "md".
+.PARAMETER Numeral
+If specified, the files will be renamed in the order of their numeric part.
+.EXAMPLE
+Rename-FilesWithZeroPadding.ps1 -ext "txt"
+Renames all files with the extension "txt" in the current folder, padding the numeric part with zeros.
+For example: '1.txt', '2.txt', ... '12.txt' -> '01.txt', '02.txt', ... '12.txt'.
+.EXAMPLE
+Rename-FilesWithZeroPadding.ps1 -Numeral # This set the Numeral switch to false
+Renames all files with the default extension "md" in the current folder, in the order of their filenames.
+For example: 'file1.md', 'file2.md', ... 'file12.md' -> '01.md', '02.md', ... '12.md'.
+#>
+param(
+    [string]$ext = "md",
+    [switch]$Numeral
+)
+if ($Numeral) {
+    $files = $files | Sort-Object { [int]($_.BaseName -replace '\D', '') }
+}
+else {
+    $files = Get-ChildItem -Filter "*.$ext" | Sort-Object Name
+    $fnamecnt = 1
+}
+$cnt = $files.Count
+
+$paddingLength = $cnt.ToString().Length
+
+foreach ($file in $files) {
+    if ($Numeral) {
+        $number = [int]($file.BaseName -replace '\D', '')
+        $newNumber = $number.ToString().PadLeft($paddingLength, '0')
+        $newName = "$newNumber.$ext"
+    }
+    else {
+        $newName = ($fnamecnt++).ToString().PadLeft($paddingLength, '0') + ".$ext"
+    }
+
+    Rename-Item -Path $file.FullName -NewName $newName
+}