Escpos

Commands

type alias Command =

Command

The basic building block.

batch : List Attribute -> List Command -> Command

This let's you group multiple commands and add attributes to them.

You can think of it as a div in html.

batch []
    [ writeLine "Hello!"
    , batch [ bold ] [ writeLine "I am bold!" ]
    ]

writeLine : String -> Command

Write the given string and insert a newline.

none : Command

Do nothing.

write : String -> Command

Write the given text.

newline : Command

Insert a newline.

Prepare to print.

You should always include this as your first command for a ticket.

cut : Command

Cut the paper.

encodeToBytes : Command -> Bytes

Return the command as bytes.

This is probably what you need to send to the printer.

encodeToInts : Command -> List Int

Return the command as a list of ints, one for each byte.

This is useful to send through a port.

encodeToJson : Command -> Value

Return the command as json. It will be an array of numbers, one for each byte.

This is useful to send through a port.

encodeToBase64 : Command -> String

Return the command as a base64 encoded string.

raw : List Int -> Command

This function lets you implement your own custom command. This is useful if you want to add a command not included in this library.

For example, the initialize command is defined as:

{-
     ASCII : ESC @
       HEX : 1B  40
   DECIMAL : 27  64
-}

So you could implement using hex it by writing:

raw [ 0x1B, 0x40 ]

or using decimal:

raw [ 27, 64 ]

Note: For a list of ESCPOS commands you should check your printer documentation.