Specify script_runner using variables? - For, .e.g., Python virtualenv

[SamuelMarks]

Feature Description

Can script_runner evaluate its variables?

Describe The Solution You'd Like

I know I can use shebang but this syntax makes more sense and would be cleaner especially when files are referenced or python -m <module_name> <arguments> are provided without resorting to @shell or @duckscript.

Code Sample

[config]
skip_core_tasks = true

[env]
VENV_DIR = "/tmp/venvs"
UV_DIR = "/tmp/venvs"
VENV_NAME = "venv"

[tasks.default]
clear = true
command = "echo"
args = ["default task"]
dependencies = ["pythontask"]


[tasks.venv]
script_runner = "@duckscript"
script = '''
if not is_file ${VENV_DIR}/${VENV_NAME}
    if is_windows
        # TODO: uv supports Windows, should be easy to impl here.
    else
        if not is_file ${UV_DIR}/uv/bin/uv
            if not is_file uv-installer.sh
                exec curl --proto "=https" --tlsv1.2 -OLsSf https://github.com/astral-sh/uv/releases/download/0.2.29/uv-installer.sh
            end
            exec env -i CARGO_HOME=${UV_DIR}/uv HOME=${UV_DIR}/uv /usr/bin/bash uv-installer.sh --no-modify-path
            rm uv-installer.sh
        end
        exec ${UV_DIR}/uv/bin/uv venv ${VENV_DIR}/${VENV_NAME}
        if is_file requirements.txt
            exec env -i PATH=${VENV_DIR}/${VENV_NAME}/bin ${UV_DIR}/uv/bin/uv pip install -r requirements.txt
        end
    end
end
'''

[tasks.pythontask]
script_runner = "${VENV_DIR}/${VENV_NAME}/bin/python"
script_extension = "py"
script = '''
import sys
# import pip; print(pip.__path__)
print(sys.executable, "\n", sys.version, sep="")
print("Python task running in Python")
'''
dependencies = ["venv"]

[cargo-make] INFO - Running Task: pythontask
[cargo-make] INFO - Execute Command: "${VENV_DIR}/${VENV_NAME}/bin/python" "/tmp/fsio_WYhdLBybEa.py"
[cargo-make] ERROR - Unable to execute script.

PS: To elaborate the idea, here's an example of executing a file that does work, but a script_runner variant makes more sense semantically IMHO:

[tasks.myfile_py]
script_runner = "@shell"
script = '''
${VENV_DIR}/${VENV_NAME}/bin/python myfile.py
'''

[sagiegurari]

this is now released