// It didn't start off that way but this is becoming more like the UNIX shell
//  (which I know very little about)

var Terminal = Command.extend({
  constructor: function() {
    this.base();
    Terminal.load(this);
    this.extend("exec", function() {
      try {
        return this.base.apply(this, arguments);
      } catch (error) {
        return String(error.message || error);
      }
    });
  }
}, {
  STATE: "#state",
  TMP:   "~terminal",
  
  load: function(terminal) {
    // the state of a terminal session is saved to disk whenever
    //  MiniWeb is saved from the terminal. Reload the saved
    //  state.
    var fs = new LocalFileSystem;
    if (!MiniWeb.readOnly && fs.exists(this.TMP)) {
      var state = JSON.parse(fs.read(this.TMP));
      fs.remove(this.TMP);
    } else {
      state = {
        commands: [],
        output:   "<pre>" + MiniWeb + "</pre><br>",
        path:     "/",
        position: 0,
        protocol: "json:"
      };
    }
    terminal.protocol = state.protocol;
    terminal.path = state.path;
    terminal[this.STATE] = state;
  },
  
  save: function(terminal) {
    // save the state of a terminal session to disk
    var state = terminal[this.STATE];
    state.protocol = terminal.protocol;
    state.path = terminal.path;
    if (!MiniWeb.readOnly) {
      var fs = new LocalFileSystem;
      fs.write(this.TMP, JSON.toString(state));
    }
  }
});