typst.sty

\ProvidesPackage{typst}[2024/12/20 v0.1 Embed Typst in LaTeX]
\RequirePackage{graphicx}
\RequirePackage{filecontents}
\RequirePackage{xparse}

\makeatletter
\newcommand{\typstflags}{}
\newcounter{@typstsrc}
\newcommand{\@space}{ }

\begin{filecontents*}{typst_premble.typ}
#set page(width: auto, height: auto, margin: 0em)
\end{filecontents*}

\NewDocumentEnvironment{typst}{m}{%
    \stepcounter{@typstsrc}
    \def\@typstfn{\jobname-\the@typstsrc}%
    \csname filecontents*\endcsname[overwrite]{\@typstfn.raw}%
    \def\@abstypstfn{$TEXMF_OUTPUT_DIRECTORY/\@typstfn}%
    \def\@abspremblefn{$TEXMF_OUTPUT_DIRECTORY/typst_premble.typ}%
}{%
    \csname endfilecontents*\endcsname%
    \IfFileExists{\@typstfn.raw}{%
        % generate the file to be compiled
        \immediate\write18{echo "// flags: \typstflags\\n" | cat - \@abstypstfn.flags \@abspremblefn \@space \@abstypstfn.raw > \@abstypstfn.typ}
        % compute md5 hash of the file
        \immediate\write18{md5sum \@abstypstfn.typ > \@abstypstfn.new.md5}
        % check md5 match, generate .changed file if not matched
        \immediate\write18{cmp -s \@abstypstfn.new.md5 \@abstypstfn.md5 || touch \@abstypstfn.changed}
        % if md5 changed, compile the file
        \IfFileExists{\@abstypstfn.changed}{%
            \immediate\write18{typst compile \typstflags \@space \@abstypstfn.typ \@abstypstfn.pdf > \@abstypstfn.log}
            \immediate\write18{mv \@abstypstfn.new.md5 \@abstypstfn.md5}
        }{%
            \immediate\write18{rm \@abstypstfn.new.md5}
        }
        \immediate\write18{rm \@abstypstfn.changed \@abstypstfn.raw \@abstypstfn.flags}
    }{%
        \PackageError{typst}{Failed to write Typst source code for \@typstfn.typ}{}
    }
    \IfFileExists{\@typstfn.pdf}{%
        \includegraphics[#1]{\@typstfn.pdf}%
    }{%
        \PackageError{typst}{Failed to compile Typst source code for \@typstfn.typ}{}
    }
}
\makeatother