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#!/usr/bin/env python3
"""
Pandoc filter to convert code blocks with class "gabc" to LaTeX
\\gabcsnippet commands in LaTeX output, and to images in HTML output.
Assumes Ghostscript, LuaLaTeX, [Gregorio](http://gregorio-project.github.io/)
and a reasonable selection of LaTeX packages are installed.
"""
import os
from sys import getfilesystemencoding, stderr
from subprocess import Popen, call, PIPE
from itertools import chain
from glob import iglob
from hashlib import sha1
from pandocfilters import toJSONFilter, RawBlock, RawInline, Para, Image
STDERR = stderr
IMAGEDIR = "tmp_gabc"
LATEX_DOC = """\\documentclass{article}
\\usepackage{libertine}
\\usepackage[autocompile,allowdeprecated=false]{gregoriotex}
\\catcode`\\℣=\\active \\def ℣#1{{\\Vbar\\hspace{-.25ex}#1}}
\\catcode`\\℟=\\active \\def ℟#1{{\\Rbar\\hspace{-.25ex}#1}}
\\catcode`\\†=\\active \\def †{{\\GreDagger}}
\\catcode`\\✠=\\active \\def ✠{{\\grecross}}
\\pagestyle{empty}
\\begin{document}
%s
\\end{document}
"""
def sha(code):
"""Returns sha1 hash of the code"""
return sha1(code.encode(getfilesystemencoding())).hexdigest()
def latex(code):
"""LaTeX inline"""
return RawInline('latex', code)
def latexblock(code):
"""LaTeX block"""
return RawBlock('latex', code)
def htmlblock(code):
"""Html block"""
return RawBlock('html', code)
def latexsnippet(code, kvs, staffsize=17, initiallines=1):
"""Take in account key/values"""
snippet = ''
staffsize = int(kvs['staffsize']) if 'staffsize' in kvs \
else staffsize
initiallines = int(kvs['initiallines']) if 'initiallines' in kvs \
else initiallines
annotationsize = .5 * staffsize
if 'mode' in kvs:
snippet = (
"\\greannotation{{\\fontsize{%s}{%s}\\selectfont{}%s}}\n" %
(annotationsize, annotationsize, kvs['mode'])
) + snippet
if 'annotation' in kvs:
snippet = (
"\\grechangedim{annotationseparation}{%s mm}{fixed}\n"
"\\greannotation{{\\fontsize{%s}{%s}\\selectfont{}%s}}\n" %
(staffsize / 60, annotationsize, annotationsize, kvs['annotation'])
) + snippet
snippet = (
"\\gresetinitiallines{%s}\n" % initiallines +
"\\grechangestaffsize{%s}\n" % staffsize +
"\\grechangestyle{initial}{\\fontsize{%s}{%s}\\selectfont{}}" %
(2.5 * staffsize, 2.5 * staffsize)
) + snippet
snippet = "\\setlength{\\parskip}{0pt}\n" + snippet + code
return snippet
def latex2png(snippet, outfile):
"""Compiles a LaTeX snippet to png"""
pngimage = os.path.join(IMAGEDIR, outfile + '.png')
texdocument = os.path.join(IMAGEDIR, 'tmp.tex')
with open(texdocument, 'w') as doc:
doc.write(LATEX_DOC % (snippet))
environment = os.environ
environment['shell_escape_commands'] = \
"bibtex,bibtex8,kpsewhich,makeindex,mpost,repstopdf," + \
','.join(
os.path.basename(n) for n in chain.from_iterable(
iglob(os.path.join(chemin, 'gregorio*'))
for chemin in os.environ["PATH"].split(os.pathsep)
)
)
proc = Popen(
["lualatex", '-output-directory=' + IMAGEDIR, texdocument],
stdin=PIPE,
stdout=STDERR,
env=environment
)
proc.communicate()
proc.stdin.close()
call(["pdfcrop", os.path.join(IMAGEDIR, "tmp.pdf")], stdout=STDERR)
call(
[
"gs",
"-sDEVICE=pngalpha",
"-r144",
"-sOutputFile=" + pngimage,
os.path.join(IMAGEDIR, "tmp-crop.pdf"),
],
stdout=STDERR,
)
def png(contents, latex_command):
"""Creates a png if needed."""
outfile = sha(contents + latex_command)
src = os.path.join(IMAGEDIR, outfile + '.png')
if not os.path.isfile(src):
try:
os.mkdir(IMAGEDIR)
stderr.write('Created directory ' + IMAGEDIR + '\n')
except OSError:
pass
latex2png(latex_command + "{" + contents + "}", outfile)
stderr.write('Created image ' + src + '\n')
return src
def properties(meta):
try:
staffsize = int(
meta['music']['c']['gregorio']['c']['staffsize']['c']
)
except (KeyError, TypeError):
staffsize = 17
try:
initiallines = int(
meta['music']['c']['gregorio']['c']['initiallines']['c']
)
except (KeyError, TypeError):
initiallines = 1
return staffsize, initiallines
def gabc(key, value, fmt, meta): # pylint:disable=I0011,W0613
"""Handle gabc file inclusion and gabc code block."""
if key == 'Code':
[[ident, classes, kvs], contents] = value # pylint:disable=I0011,W0612
kvs = {key: value for key, value in kvs}
if "gabc" in classes:
staffsize, initiallines = properties(meta)
if fmt == "latex":
if ident == "":
label = ""
else:
label = '\\label{' + ident + '}'
return latex(
"\n\\smallskip\n{%\n" +
latexsnippet(
'\\gregorioscore{' + contents + '}',
kvs, staffsize, initiallines
) +
"%\n}" +
label
)
else:
infile = contents + (
'.gabc' if '.gabc' not in contents else ''
)
with open(infile, 'r') as doc:
code = doc.read().split('%%\n')[1]
return [Image(['', [], []], [], [
png(
contents,
latexsnippet(
'\\gregorioscore', kvs, staffsize, initiallines
)
),
""
])]
elif key == 'CodeBlock':
[[ident, classes, kvs], contents] = value
kvs = {key: value for key, value in kvs}
if "gabc" in classes:
staffsize, initiallines = properties(meta)
if fmt == "latex":
if ident == "":
label = ""
else:
label = '\\label{' + ident + '}'
return [latexblock(
"\n\\smallskip\n{%\n" +
latexsnippet(
'\\gabcsnippet{' + contents + '}',
kvs, staffsize, initiallines
) +
"%\n}" +
label
)]
else:
return Para([Image(['', [], []], [], [
png(
contents,
latexsnippet(
'\\gabcsnippet', kvs, staffsize, initiallines
)
),
""
])])
if __name__ == "__main__":
toJSONFilter(gabc)
|
