nixfilter/writer.coffee

Simplify the development of (UNIX) "Filters"

'use strict'

bytes_writer = ->
	(write_bytes) ->
		(data) ->
			if not Buffer.isBuffer(data)
				data = Buffer.from(data)
			write_bytes(data)
			return

byte_writer = -> (write_bytes) ->
	write = bytes_writer()(write_bytes)
	(data) ->
		write([data])
		return

characters_writer = (encoding) ->
	encoding = (encoding or 'utf8')
	(write_bytes) ->
		write = bytes_writer()(write_bytes)
		(data) ->
			write(Buffer.from(data, encoding))
			return

character_writer = characters_writer

line_writer = (encoding) ->
	(write_bytes) ->
		write = characters_writer(encoding)(write_bytes)
		(data) ->
			write(data)
			write('\n')
			return

json_line_writer = (encoding) ->
	(write_bytes) ->
		write = line_writer(encoding)(write_bytes)
		(data) ->
			write(JSON.stringify(data))
			return

# 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