[CmdletBinding(DefaultParameterSetName='Default')]

param (

[Parameter(ParameterSetName='Default')]

[switch]$TrimTrailingWhitespace,

[Parameter(ParameterSetName='Default')]

[switch]$InsertFinalNewline,

[Parameter(Mandatory=$true, ParameterSetName='ShowGlob')]

[switch]$ShowGlob

)

$ErrorActionPreference = 'Stop'

$exts =

git ls-files --eol | # get versioned file paths with line endings

? { $_ -notmatch '/-text\b' } | # exclude binary files

% { ($_ -split '\t', 2)[1] } | # get file path

Split-Path -Extension | # get file extension

? { $_.Length -gt 1 } | # exclude those without an extension

Sort-Object | # sort alphabetically

Select-Object -Unique | # remove duplicates

% { $_.Substring(1) } # remove leading dot

$glob = "**/*.{$($exts -join ',')}"

if ($PSCmdlet.ParameterSetName -eq 'ShowGlob') {

Write-Output $glob

return

}

if (-not (Get-Command eclint -ErrorAction SilentlyContinue)) {

throw 'ECLint is not installed. To install, run: npm install -g eclint'

}

$rules = @()

if ($trimTrailingWhitespace) {

$rules += '--trim_trailing_whitespace'

}

if ($insertFinalNewline) {

$rules += '--insert_final_newline'

}

$rules | % {

Write-Verbose "eclint check $rule $glob"

# https://github.com/jednano/eclint

eclint check $_ $glob

if ($LASTEXITCODE) {

throw "eclint terminated with a non-zero exit code ($LASTEXITCODE)."

}

}