Making a custom dirlisting in PS2 - powershell

Question

Please consider the following directory tree:
root
dir1
dir11
x.L01 12kb
x.L02 10kb
dir12
dir122
a.jpg 5kb
b.xls 3kb
c.bmp 3kb
dir2
a.L01 100kb
a.L02 200kb
a.L03 50kb
dir3
dir31
dir4
There are 3 possible cases:
a (sub)dir is empty; root/dir3/dir31 and root/dir4
a (sub)dir contains (only) L0x files, where x is a number; root/dir1/dir11 and root/dir2
a (sub)dir has files, but not of the L0x-kind
The desired output is a custom directory listing with 3 columns:
filepath
filesize
lefcount (see below)
The logic is as follows:
if a (sub)dir is empty, do not list the dir
if a (sub)dir contains (only) L0x files, only list the first one (root/dir1/dir11/x.L01) but count the number of and total filesize of all L01s
if a (sub)dir has other files, list the dir, but count the number of and total filesize of all files
So the example output would be:
path size count
----------------------------------------
root/dir1/dir11/x.L01 22kb 2
root/dir1/dir12/dir122 11kb 3
root/dir2/a.L01 350kb 3
I'm just beginning powershell, and have come up with the following, which is not much but (a) am I going in the right direction? and (b) how to proceed from here?
Get-ChildItem "C:\root" -Recurse |
Foreach-Object {
If ($_.PSIsContainer) {
Get-ChildItem $_.fullname |
Foreach-Object {
Write-Host $_.fullname
}
}
}
Any help would be greatly appreciated!

Answer 1

This can evolve as your needs change. This will create the desired output as a custom object that you can manipulate and export as required.
$rootPath = "c:\temp"
Get-ChildItem $rootPath -Recurse |
Where-Object {$_.PSIsContainer} |
Where-Object {(Get-ChildItem $_.FullName | Where-Object {!$_.PSIsContainer}| Measure-Object | Select-Object -ExpandProperty Count) -gt 0} |
ForEach-Object{
$files = Get-ChildItem $_.FullName
$props = #{
Path = $_.FullName
Size = "{0:N0} KB" -f (($files | Where-Object {!$_.PSIsContainer} | Measure-Object -Sum Length | Select-Object -ExpandProperty Sum) / 1024)
Count = $files | Measure-Object | Select-Object -ExpandProperty Count
}
If($files.Extension -match "L\d\d"){
# These are special files and we are assuming they are alone in the directory
# Change the path
$props.Path = $files | Where-Object {!$_.PSIsContainer} | Select-Object -First 1 | Select-Object -ExpandProperty FullName
}
New-Object -TypeName PSCustomObject -Property $props
} | Select Path,Size,Count
Get all the folders and files recursively for the $rootPath. Filter out all files and empty folders based on their immediate contents. Then build a custom object with all the requested details. If it turns out the L0X files are present then update the path with the first one found.
Currently I assume that all files are of L0X format. If need be we can confirm.
Sample Output
Path Size Count
---- ---- -----
C:\temp\win64 1,092 KB 2
C:\temp\Empy\Stuff\New Text Document - Copy.L01 0 KB 2