nixfilter/writer.js

Simplify the development of (UNIX) "Filters"

'use strict';
var byte_writer, bytes_writer, character_writer, characters_writer, json_line_writer, line_writer;

bytes_writer = function() {
  return function(write_bytes) {
    return function(data) {
      if (!Buffer.isBuffer(data)) {
        data = Buffer.from(data);
      }
      write_bytes(data);
    };
  };
};

byte_writer = function() {
  return function(write_bytes) {
    var write;
    write = bytes_writer()(write_bytes);
    return function(data) {
      write([data]);
    };
  };
};

characters_writer = function(encoding) {
  encoding = encoding || 'utf8';
  return function(write_bytes) {
    var write;
    write = bytes_writer()(write_bytes);
    return function(data) {
      write(Buffer.from(data, encoding));
    };
  };
};

character_writer = characters_writer;

line_writer = function(encoding) {
  return function(write_bytes) {
    var write;
    write = characters_writer(encoding)(write_bytes);
    return function(data) {
      write(data);
      write('\n');
    };
  };
};

json_line_writer = function(encoding) {
  return function(write_bytes) {
    var write;
    write = line_writer(encoding)(write_bytes);
    return function(data) {
      write(JSON.stringify(data));
    };
  };
};

// What this module exports
module.exports = {
  byte: byte_writer,
  bytes: bytes_writer,
  character: character_writer,
  characters: characters_writer,
  json_line: json_line_writer,
  line: line_writer
};

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