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construct/share/webapp/js/room/input.history.js

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/*
2018-02-04 03:22:01 +01:00
// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
*/
'use strict';
/**************************************
* Input history (bash style history)
*
* this = room
*/
room.input.history = {};
room.input.history.history = function()
{
if(!Array.isArray(this.session.history))
this.session.history = [];
return this.session.history;
};
/** Add text to the history
* (use enter() for official user input)
*/
room.input.history.add = function(text)
{
let history = this.input.history.history();
history.push(text);
};
/** Get text from the history
*/
room.input.history.get = function(pos = 0)
{
let history = this.input.history.history();
return history[history.length - pos - 1];
};
/** The number of lines in the history
*/
room.input.history.len = function()
{
let history = this.input.history.history();
return maybe(() => history.length)? history.length : 0;
};
/** Enter text into the history and clear the input
*/
room.input.history.enter = function(text)
{
this.input.history.add(text);
this.input.history.pos = undefined;
this.control.input = "";
};
/** Handle an up-arrow event by restoring text from
* history into the input.
*/
room.input.history.up = function(event)
{
let pos = this.input.history.pos;
if(pos === undefined || pos < 0)
{
this.input.history.add(this.control.input);
this.input.history.pos = pos = 1;
}
if(pos > this.input.history.len() - 1)
return;
this.control.input = this.input.history.get(pos);
if(pos < this.input.history.len() - 1)
++this.input.history.pos;
};
/** Handle a down-arrow event by restoring text from
* history into the input.
*/
room.input.history.down = function(event)
{
let pos = this.input.history.pos;
if(pos === undefined)
return;
if(pos < 0)
{
this.input.history.add(this.control.input);
this.control.input = "";
}
else this.control.input = this.input.history.get(pos);
if(pos >= 0)
--this.input.history.pos;
};