kc3-lang/harfbuzz/src/gen-ragel-artifacts.py

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• Hash : e3af529e
  Author :
  Date : 2020-05-23T22:13:32
  

  [meson] update generated headers only when the result is different
  
  This way it won't ruin incremental builds.
  
  We need a better way to declare source altering tasks
  https://github.com/mesonbuild/meson/issues/7156
  yet this is good enough despite being not idiomatic.
  
  It is however not that smooth yet as the change may is detected on the
  next meson run. One of course can issue ./gen-ragel-artifacts.py
  manually for better experience before running meson.
  

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• src/gen-ragel-artifacts.py

• #!/usr/bin/env python3
  
  import io, os, re, sys, subprocess, shutil, tempfile
  
  os.chdir(os.path.dirname(__file__))
  
  if len (sys.argv) < 2:
  	ragel_sources = [x for x in os.listdir ('.') if x.endswith ('.rl')]
  else:
  	ragel_sources = sys.argv[2:]
  
  ragel = shutil.which ('ragel')
  
  if not ragel:
  	print ('You have to install ragel if you are going to develop HarfBuzz itself')
  	exit (1)
  
  if not len (ragel_sources):
  	exit (77)
  
  tempdir = tempfile.mkdtemp ()
  
  for rl in ragel_sources:
  	hh = rl.replace ('.rl', '.hh')
  	shutil.copy (rl, tempdir)
  	# writing to stdout has some complication on Windows
  	subprocess.Popen ([ragel, '-e', '-F1', '-o', hh, rl], cwd=tempdir).wait ()
  
  	generated_path = os.path.join (tempdir, hh)
  	with open (generated_path, "rb") as temp_file:
  		generated = temp_file.read()
  
  	with open (hh, "rb") as current_file:
  		current = current_file.read()
  
  	# overwrite only if is changed
  	if generated != current:
  		shutil.copyfile (generated_path, hh)
  
  shutil.rmtree(tempdir)
  

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