Make Justfiles out of Makefiles

justmakefiles.py

import os


def main():
    makefile_path = os.path.join(os.getcwd(), "Makefile")
    with open(makefile_path, "r") as makefile:
        content = makefile.readlines()

    new_content = ""

    for line in content:
        # 1. Remove PHONY lines
        if line.startswith(".PHONY"):
            pass
        else:
            # 2. Swap variable syntax
            # 3. Remove the piped dependencies
            # 4. Swap make for just
            var_replacement = (
                line.replace("$(", "{{").replace(")", "}}").replace(": | ", ": ").replace("make", "just")
            )
            if len(var_replacement.split(" - ")) > 1:
                # 5. Remove the double-verbose comment headers
                new_content += "# " + var_replacement.split(" - ")[1]
            else:
                new_content += var_replacement

    # 6. Replace Makefile tabs with 4 spaces
    new_content = new_content.expandtabs(4)

    with open("justfile", "w") as justfile:
        justfile.write(new_content)


if __name__ == "__main__":
    main()