CmdUtils.CreateCommand({
  name: "sparkword",
  description: "Graphs the current selection, turning it into a textual sparkline.",
  takes: {"data": noun_arb_text},
  // really this is Aza Raskin's code with a small change from me
  author: {name: "Brian Ewins", email:"brian.ewins@gmail.com"},
  license: "MIT",
  help: "Select a set of numbers -- in a table or otherwise -- and use this command to graph them as a sparkline. Don't worry about non-numbers getting in there. It'll handle them.",

  _cleanData: function( string ) {
    var dirtyData = string.split(/\W/);
    var data = [];
    for(var i=0; i<dirtyData.length; i++){
      var datum = parseFloat( dirtyData[i] );
      if( datum.toString() != "NaN" ){
        data.push( datum );
      }
    }

    return data;
  },

  _dataToSparkline: function( string ) {
    var data = this._cleanData( string );
    if( data.length < 2 ) return null;

    var data = this._cleanData( string );
    if( data.length < 2 ) return null;
    var min = 9999;
    var max = -1;

    for ( var i = 0; i < data.length; i++ ) {
       data[i] = data[i] - 0;
       if ( data[i] < min ) min = data[i];
       if ( data[i] > max ) max = data[i];
    }

    // Use 1/8 as baseline
    var chars="\u2581\u2582\u2583\u2584\u2585\u2586\u2587\u2588";
    var scale = (max == min) ? 1 : 7./(max - min);
    var sparkword = "";
    for (var i = 0; i < data.length; i++) {
      var h = Math.round((data[i] - min) * scale);
      sparkword += chars.charAt(h);
    }

    return sparkword;
  },

  preview: function(pblock, input) {
    var img = this._dataToSparkline( input.text );
    if( !img )
      jQuery(pblock).text( "Requires numbers to graph." );
    else
      jQuery(pblock).empty().append( img ).height( "15px" );
  },

  execute: function( input ) {
    var img = this._dataToSparkline( input.text );
    if( img ) CmdUtils.setSelection( img );
  }
});