10.6. Pomeniu Script-Fu

This submenu contains some Script-Fu commands, especially the Script-Fu console. Script-Fu is a language for writing scripts, which allow you to run a series of GIMP commands automatically.

10.6.1. Activating the Submenu

  • You can access this command from the main menu through FiltersDevelopmentScript-Fu.

10.6.2. Refresh Scripts

You will need this command every time you add, remove, or change a Script-Fu script. The command causes the Script-Fus to be reloaded and the menus containing Script-Fus to be rebuilt from scratch. If you don't use this command, GIMP won't notice your changes until you start it again.

Note that you won't get any feedback, unless saving, if one of your scripts fails.

10.6.3. Script-Fu konsolė

The Script-Fu console is a dialog window where you can interactively test Scheme commands.

The console consists of a large scrollable main window for output and a text box at the bottom to enter Scheme commands. When you type a Scheme statement and then press the Enter key, the command and its return value will be displayed in the main window.

Pav. 16.252. The Script-Fu Console

The Script-Fu Console

You will find more information about Scheme and examples how to use the Script-Fu console in Skyrius 3, „A Script-Fu Tutorial“.

The Script-Fu Console Buttons

Browse

The Browse button is next to the Scheme commands text box. When clicked, the procedure browser window opens with an additional Apply button.

Select a PDB procedure from the list and press the Apply button. The selected procedure and its parameter names will be pasted into the text box of the Script Console.

Now you just have to replace the parameter names after the procedure name with actual values. Then you can call the procedure by pressing Enter.

Close

Pressing this button closes the Script-Fu console.

Išvalyti

When you click on this button, the content of the main window will be removed. Note that you can't get back the removed content using the Save command.

Įrašyti

This command lets you save the content of the main window, that is the Script-Fu console output (including the >-characters).

10.6.4. Start Server

This command will start a server, which reads and executes Script-Fu (Scheme) statements you send him via a specified port.

Pav. 16.253. The Script-Fu Server Options

The Script-Fu Server Options

Server Port

The port number where the Script-Fu server will listen. It is possible to start more than one server, specifying different port numbers, of course.

Server Logfile

Optionally you can specify the name of a file the server will use to log informal and error messages. If no file is specified, messages will be written to stdout.

The Script-Fu Server Protocol

The protocol used to communicate with the Script-Fu server is very simple:

  • Every message (Script-Fu statement) of length L sent to the server has to be preceded with the following 3 bytes:

    Lentelė 16.1. Header format for commands

    Byte # Content Description
    0 0x47 Magic byte ('G')
    1 L div 256 High byte of L
    2 L mod 256 Low byte of L

  • Every response from the server (return value or error message) of length L will be preceded with the following 4 bytes:

    Lentelė 16.2. Header format for responses

    Byte # Content Description
    0 0x47 Magic byte ('G')
    1 error code 0 on success, 1 on error
    2 L div 256 High byte of L
    3 L mod 256 Low byte of L

[Patarimas] Patarimas

If you don't want to get your hands dirty: there is a Python script named servertest.py shipped with the GIMP source code, which you can use as a simple command line shell for the Script-Fu server.