markdown-it-terminal/lib/utils.js

Plugin for markdown-it to parse and output markdown formatted for the terminal

// Utilities
//
'use strict';

// Merge objects
//
function assign(obj /*from1, from2, from3, ...*/) {
  var sources = Array.prototype.slice.call(arguments, 1);

  sources.forEach(function (source) {
    if (!source) { return; }

    if (typeof source !== 'object') {
      throw new TypeError(source + 'must be object');
    }

    Object.keys(source).forEach(function (key) {
      obj[key] = source[key];
    });
  });

  return obj;
}

////////////////////////////////////////////////////////////////////////////////

var HTML_ESCAPE_TEST_RE = /[&<>"]/;
var HTML_ESCAPE_REPLACE_RE = /[&<>"]/g;
var HTML_REPLACEMENTS = {
  '&': '&amp;',
  '<': '&lt;',
  '>': '&gt;',
  '"': '&quot;'
};

function replaceUnsafeChar(ch) {
  return HTML_REPLACEMENTS[ch];
}

function escapeHtml(str) {
  if (HTML_ESCAPE_TEST_RE.test(str)) {
    return str.replace(HTML_ESCAPE_REPLACE_RE, replaceUnsafeChar);
  }
  return str;
}


////////////////////////////////////////////////////////////////////////////////

var styles = require('ansi-styles');

function compoundStyle(styleList) {
  var open  = '';
  var close = '';
  styleList.forEach(function(style){
    open += styles[style].open;
  });
  styleList.reverse().forEach(function(style) {
    close += styles[style].close;
  });
  
  return {
    open: open, 
    close: close
  };
};

////////////////////////////////////////////////////////////////////////////////

// Re-export libraries commonly used in both markdown-it and its plugins,
// so plugins won't have to depend on them explicitly, which reduces their
// bundled size (e.g. a browser build).
//

exports.assign              = assign;
exports.escapeHtml          = escapeHtml;

exports.compoundStyle       = compoundStyle;