gabc.py 文件源码

def latex2png(snippet, outfile):
    """Compiles a LaTeX snippet to png"""
    pngimage = os.path.join(IMAGEDIR, outfile + '.png')
    environment = os.environ
    environment['openout_any'] = 'a'
    environment['shell_escape_commands'] = \
        "bibtex,bibtex8,kpsewhich,makeindex,mpost,repstopdf,gregorio"
    proc = Popen(
        ["lualatex", '-output-directory=' + IMAGEDIR],
        stdin=PIPE,
        stdout=DEVNULL,
        env=environment
    )
    proc.stdin.write(
        (
            LATEX_DOC % (snippet)
        ).encode("utf-8")
    )
    proc.communicate()
    proc.stdin.close()
    call(["pdfcrop", os.path.join(IMAGEDIR, "texput.pdf")], stdout=DEVNULL)
    call(
        [
            "gs",
            "-sDEVICE=pngalpha",
            "-r144",
            "-sOutputFile=" + pngimage,
            os.path.join(IMAGEDIR, "texput-crop.pdf"),
        ],
        stdout=DEVNULL,
    )