sharp-cli/cmd/operations/recomb.js

CLI for sharp.

/*!
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Mark van Seventer
 *
 * 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
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

// @see https://sharp.dimens.io/api-operation#recomb

// Strict mode.
'use strict'

// Local modules.
const queue = require('../../lib/queue')

// Configure.
const placeholders = {
  matrix: {
    desc: 'Recombination matrix',
    nargs: 3 * 3,
    type: 'number'
  }
}

// Command builder.
const builder = (yargs) => {
  return yargs
    .strict()
    .example('$0 recomb 0.3588 0.7044 0.1368 0.2990 0.5870 0.1140 0.2392 0.4696 0.0912', 'The recomb will be applied to the output, in this case a sepia filter has been applied')
    .epilog('For more information on available options, please visit https://sharp.dimens.io/api-operation#recomb')
    .check(argv => {
      if (!(Array.isArray(argv.matrix) && argv.matrix.length === 9)) {
        throw new Error('Expected matrix positional to have 9 values')
      }
      return true
    })
    .positional('matrix', placeholders.matrix)
}

// Command handler.
const handler = (args) => {
  const { matrix } = args
  return queue.push(['recomb', (sharp) => {
    return sharp.recomb([
      matrix.slice(0, 3),
      matrix.slice(3, 6),
      matrix.slice(6, 9)
    ])
  }])
}

// Exports.
module.exports = {
  command: 'recomb <matrix..>',
  describe: 'Recomb the image with the specified matrix',
  builder,
  handler
}