https://github.com/staltz/callbag-from-pull-stream

👜 Convert a pull-stream to a pullable callbag source
https://github.com/staltz/callbag-from-pull-stream

Last synced: about 2 months ago
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👜 Convert a pull-stream to a pullable callbag source

• Host: GitHub
• URL: https://github.com/staltz/callbag-from-pull-stream
• Owner: staltz
• License: mit
• Created: 2018-02-16T18:15:56.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-02-16T18:16:06.000Z (over 6 years ago)
• Last Synced: 2024-07-04T14:17:16.798Z (3 months ago)
• Language: JavaScript
• Size: 3.91 KB
• Stars: 4
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.js
  • License: LICENSE

Awesome Lists containing this project

• awesome-callbags - from-pull-stream

README

        
/**

 * callbag-from-pull-stream

 * ------------------------

 *

 * Convert a pull-stream to a pullable callbag source.

 *

 * `npm install callbag-from-pull-stream`

 *

 * Example:

 *

 *     const pull = require('pull-stream');

 *     const {pipe, filter, forEach} = require('callbag-basics');

 *     const fromPullStream = require('callbag-from-pull-stream');

 *

 *     const source = pull(

 *       pull.values([1,3,5,7,9]),

 *       pull.filter(x => x !== 5), // 1,3,7,9

 *       pull.map(x => x * 10) // 10,30,70,90

 *     )

 *

 *     pipe(

 *       fromPullStream(source),

 *       filter(x => x !== 30), // 10,70,90

 *       forEach(x => console.log(x))

 *     )

 */

const fromPullStream = read => (start, sink) => {

  if (start !== 0) return;

  sink(0, (t, d) => {

    if (t === 1) read(null, (end, data) => {

      if (end === true) sink(2);

      else if (end) sink(2, end);

      else sink(1, data);

    });

    if (t === 2) read(d || true, () => {});

  });

};

module.exports = fromPullStream;