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refactor latex handling

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This commit is contained in:
Damien Elmes 2008-12-23 16:24:06 +09:00
parent 41fe0c92be
commit 6a21be9d19
1 changed files with 31 additions and 9 deletions
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40
anki/latex.py
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@ -74,16 +74,27 @@ def call(*args, **kwargs):
break break
return ret return ret
def imgLink(deck, latex): def generatedFile(latexCode):
"Parse LATEX and return a HTML image representing the output." return "%s.png" % md5(latexCode).hexdigest()
def generatedPath(deck, latexCode):
"Return the path to the cache file in system encoding format."
path = os.path.join(deck.mediaDir(create=True),
generatedFile(latexCode))
return path.encode(sys.getfilesystemencoding())
def mungeLatex(latex):
"Convert entities, fix newlines, and convert to utf8."
for match in re.compile("&([a-z]+);", re.IGNORECASE).finditer(latex): for match in re.compile("&([a-z]+);", re.IGNORECASE).finditer(latex):
if match.group(1) in entitydefs: if match.group(1) in entitydefs:
latex = latex.replace(match.group(), entitydefs[match.group(1)]) latex = latex.replace(match.group(), entitydefs[match.group(1)])
latex = re.sub("<br( /)?>", "\n", latex) latex = re.sub("<br( /)?>", "\n", latex)
latex = latex.encode("utf-8") latex = latex.encode("utf-8")
imageFile = "latex-%s.png" % md5(latex).hexdigest() return latex
imagePath = os.path.join(deck.mediaDir(create=True), imageFile)
imagePath = imagePath.encode(sys.getfilesystemencoding()) def imageForLatex(deck, latex):
"Return an image that represents 'latex', building if necessary."
imagePath = generatedPath(deck, latex)
if not os.path.exists(imagePath): if not os.path.exists(imagePath):
log = open(os.path.join(tmpdir, "latex_log.txt"), "w+") log = open(os.path.join(tmpdir, "latex_log.txt"), "w+")
texpath = os.path.join(tmpdir, "tmp.tex") texpath = os.path.join(tmpdir, "tmp.tex")
@ -101,13 +112,24 @@ def imgLink(deck, latex):
si = None si = None
try: try:
os.chdir(tmpdir) os.chdir(tmpdir)
errmsg = _("Error executing 'latex' or 'dvipng' - are they installed?") errmsg = _(
"Error executing 'latex' or 'dvipng'.\n"
"A log file is available here:\n%s") % tmpdir
if call(["latex", "-interaction=nonstopmode", if call(["latex", "-interaction=nonstopmode",
texpath], stdout=log, stderr=log, startupinfo=si): texpath], stdout=log, stderr=log, startupinfo=si):
return errmsg return (False, errmsg)
if call(latexDviPngCmd + ["tmp.dvi", "-o", imagePath], if call(latexDviPngCmd + ["tmp.dvi", "-o", imagePath],
stdout=log, stderr=log, startupinfo=si): stdout=log, stderr=log, startupinfo=si):
return errmsg return (False, errmsg)
finally: finally:
os.chdir(oldcwd) os.chdir(oldcwd)
return '<img src="%s">' % imageFile return (True, imagePath)
def imgLink(deck, latex):
"Parse LATEX and return a HTML image representing the output."
latex = mungeLatex(latex)
(ok, img) = imageForLatex(deck, latex)
if ok:
return '<img src="%s">' % img
else:
return img