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59 lines
2.0 KiB
59 lines
2.0 KiB
7 years ago
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#!/usr/bin/env python
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import logging
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import os
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import tempfile
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from zlib import adler32
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from subprocess import Popen, PIPE
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from pelican import logger
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def generate_uml_image(path, plantuml_code, imgformat):
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tf = tempfile.NamedTemporaryFile(delete=False)
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tf.write('@startuml\n'.encode('utf8'))
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tf.write(plantuml_code.encode('utf8'))
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tf.write('\n@enduml'.encode('utf8'))
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tf.flush()
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logger.debug("[plantuml] Temporary PlantUML source at "+(tf.name))
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if imgformat == 'png':
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imgext = ".png"
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outopt = "-tpng"
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elif imgformat == 'svg':
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imgext = ".svg"
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outopt = "-tsvg"
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else:
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logger.error("Bad uml image format '"+imgformat+"', using png")
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imgext = ".png"
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outopt = "-tpng"
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# make a name
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name = tf.name+imgext
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# build cmd line
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cmdline = ['plantuml', '-o', path, outopt, tf.name]
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try:
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logger.debug("[plantuml] About to execute "+" ".join(cmdline))
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p = Popen(cmdline, stdout=PIPE, stderr=PIPE)
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out, err = p.communicate()
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except Exception as exc:
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raise Exception('Failed to run plantuml: %s' % exc)
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else:
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if p.returncode == 0:
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# diagram was correctly generated, we can remove the temporary file (if not debugging)
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if not logger.isEnabledFor(logging.DEBUG):
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os.remove(tf.name)
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# renaming output image using an hash code, just to not pollute
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# output directory with a growing number of images
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name = os.path.join(path, os.path.basename(name))
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newname = os.path.join(path, "%08x" % (adler32(plantuml_code.encode()) & 0xffffffff))+imgext
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if os.path.exists(newname):
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os.remove(newname)
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os.rename(name, newname)
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return 'images/' + os.path.basename(newname)
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else:
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# the temporary file is still available as aid understanding errors
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raise RuntimeError('Error calling plantuml: %s' % err)
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