The code is a bit messy and may include bugs ;-) Anyway, I want to clean it up and add features (see below).
The process_latex() function will read the given template, render it with a custom context and convert it into the desired output format by running it through pdflatex.
Depending on the outfile parameter, the output will either be returned (for a response object) or written to the path specified in outfile (useful for save() in models which generate static, unique files).
TODO
- Error handling in case pdflatex breaks (non-zero return value)
- Optionally returning a HttpResponse with the correct mimetype and Content-Disposition set to attachement and an appropriate filename
- RequestContext instead of Context (passing the Context object instead of a dict)
CREDITS
Credits also go to ronny for the names dict :-P
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | from subprocess import call, PIPE
from os import remove, rename
from os.path import dirname
from tempfile import NamedTemporaryFile
from django.template import loader, Context
def process_latex(template, context={}, type='pdf', outfile=None):
"""
Processes a template as a LaTeX source file.
Output is either being returned or stored in outfile.
At the moment only pdf output is supported.
"""
t = loader.get_template(template)
c = Context(context)
r = t.render(c)
tex = NamedTemporaryFile()
tex.write(r)
tex.flush()
base = tex.name
items = "log aux pdf dvi png".split()
names = dict((x, '%s.%s' % (base, x)) for x in items)
output = names[type]
if type == 'pdf' or type == 'dvi':
pdflatex(base, type)
elif type == 'png':
pdflatex(base, 'dvi')
call(['dvipng', '-bg', '-transparent',
names['dvi'], '-o', names['png']],
cwd=dirname(base), stdout=PIPE, stderr=PIPE)
remove(names['log'])
remove(names['aux'])
if not outfile:
o = file(output).read()
remove(output)
return o
else:
rename(output, outfile)
def pdflatex(file, type='pdf'):
call(['pdflatex', '-interaction=nonstopmode',
'-output-format', type, file],
cwd=dirname(file), stdout=PIPE, stderr=PIPE)
|
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