1 files changed, 67 insertions, 0 deletions
diff --git a/scripts/tikz.py b/scripts/tikz.py
new file mode 100755
index 000000000..7e1ed7927
--- /dev/null
+++ b/scripts/tikz.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+
+"""
+Pandoc filter to process raw latex tikz environments into images.
+Assumes that pdflatex is in the path, and that the standalone
+package is available.  Also assumes that ImageMagick's convert
+is in the path. Images are put in the tikz-images directory.
+"""
+
+import hashlib
+import re
+import os
+import sys
+import shutil
+from pandoc import toJSONFilter
+from subprocess import Popen, PIPE, call
+from tempfile import mkdtemp
+
+imagedir = "tikz-images"
+
+def sha1(x):
+  return hashlib.sha1(x).hexdigest()
+
+def tikz2image(tikz, filetype, outfile):
+  tmpdir = mkdtemp()
+  olddir = os.getcwd()
+  os.chdir(tmpdir)
+  f = open('tikz.tex', 'w')
+  f.write("""\\documentclass{standalone}
+             \\usepackage{tikz}
+             \\begin{document}
+             """)
+  f.write(tikz)
+  f.write("\n\\end{document}\n")
+  f.close()
+  p = call(["pdflatex", 'tikz.tex'], stdout=sys.stderr)
+  os.chdir(olddir)
+  if filetype == 'pdf':
+    shutil.copyfile(tmpdir + '/tikz.pdf', outfile + '.pdf')
+  else:
+    call(["convert", tmpdir + '/tikz.pdf', outfile + '.' + filetype])
+  shutil.rmtree(tmpdir)
+
+def tikz(key, value, format):
+  if key == 'RawBlock':
+    [fmt, code] = value
+    if fmt['unFormat'] == "latex" and re.match("\\\\begin{tikzpicture}", code):
+      outfile = imagedir + '/' + sha1(code)
+      if format == "html":
+        filetype = "png"
+      elif format == "latex":
+        filetype = "pdf"
+      else:
+        filetype = "png"
+      src = outfile + '.' + filetype
+      if not os.path.isfile(src):
+        try:
+          os.mkdir(imagedir)
+          sys.stderr.write('Created directory ' + imagedir + '\n')
+        except OSError:
+          pass
+        tikz2image(code, filetype, outfile)
+        sys.stderr.write('Created image ' + src + '\n')
+      return {'Para': [{'Image': [[], [src,""]]}]}
+
+if __name__ == "__main__":
+  toJSONFilter(tikz)