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Generating a custom block file for UiFlow

This script generates a custom block file(the M5B file) from a JSON file for setting custom blocks, and MicroPython files defined codes for custom blocks.

You can also generate the JSON and MicroPython files from an existing M5B file.

Installation

I have developed and tested this script using VS Code, Git Bash, and Python v3.10.4 on the Windows 11 environment.

To install this script, execute the following:

pip install git+https://github.com/3110/uiflow-custom-block-generator

Setting Custom Blocks

The structure of the JSON file for setting custom blocks is the following:

{
  "category": "ATOM_Babies",
  "color": "#115f07",
  "blocks": [
    {
      "name": "init_atom_babies",
      "type": "execute",
      "params": [
        { "name": "Initialize ATOM Babies", "type": "label" },
        { "name": "_eye_color", "type": "variable" },
        { "name": "_cheek_color", "type": "variable" },
        { "name": "_background_color", "type": "variable" }
      ]
    },
    {
      "name": "rgb",
      "type": "value",
      "params": [
        { "name": "Specify the color", "type": "label" },
        { "name": "_r", "type": "number" },
        { "name": "_g", "type": "number" },
        { "name": "_b", "type": "number" }
      ]
    }
  ]
}

• category: Same as Namespace on the UiFlow Block Maker.
• color: Specify the color of custom blocks with #RRGGBB.
• blocks: Define custom blocks. They are arranged in the order in which they appear here.

To define custom blocks, specify the following items in blocks:

• name: Filename of MicroPython codes for the custom block. The setting "name": "rgb" means rgb.py is read from the same directory as the JSON file.
• type: Type of the custom block. You can specify the two types of blocks: value(the block returns a value) and execute(the block does not return any value).
• params: Arguments for the custom block. They are arranged in the order in witch they appear here.

To define arguments of the custom block, specify the following items in params.

• name: The name of the argument. If type is label, this is the label shown on the block.
• type: The type of the argument. There are four types:
  • label: The label displayed on the block. Multiple specifications are allowed.
  • string: String.
  • number: Number.
  • variable: Variable.

Please refer to examples/atom_babies for the sample.

Execution

Generating the M5B file from the JSON file and MicroPython files

To generate atom_babies.m5b on the same directory as the JSON file, execute the following:

python -m uiflow_custom_block_generator examples/atom_babies/atom_babies.json

You can specify --target_dir(-t) option to change the output directory of the M5B file.

For example, atom_babies.m5b is generated on the current directory if you execute the following:

python -m uiflow_custom_block_generator examples/atom_babies/atom_babies.json -t .

Caution: UiFlow Block Maker cannot read the M5B file generated from this script.

Generating the JSON file and MicroPython files from the M5B file

The following command creates the atom_babies directory in the same directory as the M5B file and generates atom_babies.json and the MicroPython files in the atom_babies directory.

python -m uiflow_custom_block_generator example/atom_babies/atom_babies.m5b

You can specify --target_dir(-t) option to change the output directory of the JSON file and MicroPython files. The following command creates atom_babies directory in the current directory.

python -m uiflow_custom_block_generator examples/atom_babies/atom_babies.m5b -t .

Notes on VS Code

• Because Flake8 detects Invalid Syntax(E999) for ${}(the reference to the argument of the custom block), the setting in .vscode/settings.json suppresses E999.
• If you use rgb modules in the custom block codes, you have to specify # type: ignore # noqa: F821 to ignore undefined name errors.