# ---- ludic ui-preview ---------------------------------------------------------
# A game's ludic.ui components previewed for a studio over stdio: ludic.ui with a backend that
# records its draw calls, and component classes the studio describes. No game code, no GPU, no
# network. The studio spawns it; tools/ui-preview/protocol-v1.md is the contract.
#
#   ludic ui-preview [--font DIR]    the host, on stdin and stdout
function cmd_ui_preview() -> int {
  var args = ""
  var ai = 2
  while ai < arg_count() {
    args = `{args} {sh_single(arg(ai))}`
    ai += 1
  }
  let bin = `{ludic_home()}bin/{exe_name("ludic-ui-preview")}`
  if is_exec(bin) { return sh(`exec {sh_single(bin)}{args}`) }
  if capture_line(`command -v {exe_name("ludic-ui-preview")} 2>/dev/null`) != "" { return sh(`exec {exe_name("ludic-ui-preview")}{args}`) }
  err("ludic ui-preview: no bin/ludic-ui-preview in this install (a checkout builds it with: ludic-dev build)\n")
  return 1
}