# reload.ludic - a developer's templates and stylesheets read again when they change on disk: every
# file is re-read in the order it was first loaded (so an import is there before its importer), and
# the screens' state is kept, as React's fast refresh keeps it. True when anything changed.
@alloc_ok("developer builds only: the screens' files looked at again once a second")
export function ui_reload(ui_st: mut UiState) -> bool {
  var changed = uc_reload(ui_st)
  for i in 0 .. len(ui_st.lib_files) {
    let f = ui_st.lib_files[i]
    if f.disk {
      let now = lib_text(ui_st, f.path)
      if now != f.src { changed = true }
      rl_let_go(now)                 # read only to compare; a change is read again below
    }
  }
  if not changed { return false }
  ui_st.ui_errs = new []string
  if len(ui_st.lib_files) == 0 {
    print(`ui: templates reloaded`)
    return true
  }
  let old = ui_st.lib_files
  ui_st.lib_files = new []UiFile
  ui_st.lib_screen_names = new []string
  ui_st.lib_screens = new []UiTpl
  ui_st.ui_errs = new []string
  for i in 0 .. len(old) {
    let f = old[i]
    var have = false
    for k in 0 .. len(ui_st.lib_files) {
      if ui_st.lib_files[k].path == f.path { have = true }
    }
    if have { continue }
    if f.disk { lib_file(ui_st, f.path) } else { ui_load_text(ui_st, f.src, f.path) }
  }
  uc_invalidate(ui_st)
  print(`ui: templates reloaded`)
  return true
}
# a text read from disk only to be compared, given back (never a literal: lib_text's "" is not freed)
function rl_let_go(s: string) -> void {
  if s == null or len(s) == 0 { return }
  unsafe { free(s) }
}