Generates EightShapes Contrast Grid or Christopher Geary's "Contrast" tool URLs from InVision DSM or Brand.ai design tokens.

contrast-grid-url.js

/*
 Generates EightShapes Contrast Grid or Christopher Geary's "Contrast" tool
 URLs from InVision DSM or Brand.ai.

 Usage for Contrast Grid URL:

 node contrast-grid-url.js [URL]

 Usage for Contrast URL:

 node contrast-grid-url.js [URL] --crgeary

 [URL] should be the URL to your Brand.ai JSON styles data export. Note that
 you may need to wrap the URL in quotes.

 ----------------------------------------------------------------------------
 Copyright 2017-2020 James Nash

 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),
 to deal in the Software without restriction, including without limitation
 the rights to use, copy, modify, merge, publish, distribute, sublicense,
 and/or sell copies of the Software, and to permit persons to whom the
 Software is furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 IN THE SOFTWARE.
 ----------------------------------------------------------------------------
*/
'use strict';

const https = require('https');

function generateEightShapesUrl(colors) {
  let colorText = '';

  for(let j=0; j<colors.length; ++j){
    colorText += colors[j].value + ', ';
    colorText += colors[j].name + "\n";
  }
    
  return 'http://contrast-grid.eightshapes.com/?background-colors=&foreground-colors=' +
          encodeURIComponent(colorText) +
          '&es-color-form__tile-size=compact'
}

function generateCrGearyContrastUrl(colors) {
  let colorText = '';

  for(let i=0; i<colors.length; ++i){
    colorText += colors[i].value.substr(1) + (i < (colors.length - 1) ? ',' : '');
  }

  return 'https://contrast.crgeary.com/#' + colorText;
}

let outputDsmLink = true;
if (process.argv[3] === '--crgeary') {
  outputDsmLink = false;
}

https.get(
  process.argv[2], // Should be the URL to the InVision DSM / Brand.ai JSON styles
  (res) => {
    let body = '';

    res.on('data', (chunk) => {
      body += chunk;
    });

    res.on('end', () => {
      let data = JSON.parse(body);
      let colorPalettes = data.list.colors;
      let colors = [];
      for(let i=0; i<colorPalettes.length; ++i) {
        colors = colors.concat(colorPalettes[i].colors);
      }

      process.stdout.write(`${outputDsmLink ? generateEightShapesUrl(colors) : generateCrGearyContrastUrl(colors)}\n`);
    });

  }).on('error', (e) => {
    console.error(e);
  }
);

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