--[[

  This Extension shows how to wrap-up an existing trigger, so its logic is reused
  and so it gets some of the benefits of Extensions, like automatic replication, etc.
  The trigger is Perl, so it needs its own runtime to be installed, but we could include
  it inside the Extension if we wanted so it's completely stand-alone without runtime
  dependencies.

  https://swarm.workshop.perforce.com/files/guest/jason_gibson/misc/ascii-check.pl?v=1

]]--

function GlobalConfigFields()
  return {}
end

function InstanceConfigFields()
  return {}
end

function InstanceConfigEvents()
  return { ["form-in"] = "change" }
end

function runcmd( cmd )
    local stderr = os.tmpname()
    local stdout = os.tmpname()
-- todo: spaces in path
    local rc = os.execute( cmd .. ' > ' .. stdout .. ' 2> ' .. stderr )

    local sefh = io.open( stderr )
    local sofh = io.open( stdout )

    local stderr = sefh:read( "*all" )
    local stdout = sofh:read( "*all" )

    sefh:close()
    sofh:close()

    return rc, stdout, stderr
end

function FormIn()
  local cmd = "perl " .. Helix.Core.Server.GetArchDirFileName( "ascii-check.pl" )
  cmd = cmd .. ' "' .. Helix.Core.Server.GetVar( "formfile" ) .. '"'

  local rc, stdout, stderr = runcmd( cmd )

  if rc == nil or string.len( stderr ) > 0 then
    Helix.Core.Server.SetClientMsg( "Error running wrapped trigger:  " .. stdout .. stderr )
    return false
  end

  if string.len( stdout ) > 0 then
    Helix.Core.Server.SetClientMsg( stdout )
  end

  return true
end