Function _has

demo/app.py:571–572

(bin_name)

        import subprocess as _sp

        def _has(bin_name):
            return _sh.which(bin_name) is not None

        # Most-tolerant: prefer latexmk with XeLaTeX and force (-f), then XeLaTeX, then LuaLaTeX
        pretex = r"\nonstopmode\scrollmode\makeatletter\let\pgf@error\pgf@warning\let\GenericError\GenericWarning\let\PackageError\PackageWarning\makeatother"