img2ch.ps1

# 2ch.hk image dumper
# Usage: execute in PowerShell by right click or pass thread URLs as arguments
# (multiple threads allowed); passing args require execution policy

function Get-2chimages ($threadurl) {
  if ( -not ($threadurl -match "^http[s]{0,1}://2ch\.(hk|pm|re|tf|wf|yt)/[a-z]+/res/[0-9]+\.html$") ) {
    echo "URL ""$threadurl"" is not valid!"
    return 1
  }

  $threadid = $threadurl.Substring($threadurl.LastIndexOf("/") + 1)

  echo "Downloading thread $threadid..."
  $pagedata = wget $threadurl
  if (-not $?) {
    echo "Thread ""$threadurl"" not found!"
    return 2
  }

  $urlbase = $threadurl.Substring(0, $threadurl.IndexOf(".") + 4)

  echo 'Finding images...'
  $imgs = echo $pagedata.Links | where href -match "^/[a-z]+/src/[0-9]+\.(jpg|png|gif|webm)" | select href

  md imgs$threadid

  echo 'Downloading images...'
  foreach ($img in $imgs) {
    $dld = $urlbase + $img.href
    $filename = "imgs$threadid" + "\" + $dld.Substring($dld.LastIndexOf("/") + 1)
    wget $dld -OutFile $filename
  }
}

if (-not $args) {
  $threadurl = Read-Host 'Enter full thread URL'
  Get-2chimages $threadurl
}
else {
  foreach ($threadurl in $args) { Get-2chimages $threadurl }
}