67 lines
2.2 KiB
Python
Executable File
67 lines
2.2 KiB
Python
Executable File
#!/usr/bin/python
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import sys,re,os
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from argparse import ArgumentParser
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from argparse import RawTextHelpFormatter
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def setup_options():
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parser=ArgumentParser(description="""Template Filler
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=== Template example: ===
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Hello [[name]]!
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== Value file/Value pair example: ==
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[[name]]=John
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""",formatter_class=RawTextHelpFormatter)
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parser.add_argument("-e",action="store_true",dest="env",default=False,
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help="Use the environment to replace ${env} style variables.")
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parser.add_argument("-f",action="store",dest="file",
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help="File name to read keys/values.")
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parser.add_argument("-p",action="append",dest="values",default=[],
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help="key=value pairs. This option may be issued several times.")
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parser.add_argument('template', action="store", nargs='?',
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help="Template file to be filled. If not defined, stdin used.")
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options=parser.parse_args()
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return options
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def parse_file(filename):
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pairs=[]
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with open(filename,"r") as reader:
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for i,l in enumerate(reader):
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l=l.rstrip("\n\r")
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if len(l)==0:
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continue
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tokens = l.split('=', 1)
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if len(tokens)!=2:
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print("File %s:%i key=value pair '%s' does not parse"%(filename,i+1,l,))
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sys.exit(1)
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pairs.append( (tokens[0], tokens[1].decode('string_escape')) )
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return pairs
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def parse_arguments(args):
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pairs=[]
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for p in args:
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tokens = p.split('=', 1)
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if len(tokens)!=2:
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print("Argument key=value pair '%s' does not parse"%(p,))
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sys.exit(1)
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pairs.append( (tokens[0], tokens[1].decode('string_escape')) )
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return pairs
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options=setup_options();
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pairs=[]
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if options.file!=None:
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pairs.extend(parse_file(options.file))
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pairs.extend(parse_arguments(options.values))
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if options.template==None:
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in_reader=sys.stdin
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else:
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in_reader=open(options.template,'rb')
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for l in in_reader:
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for p in pairs:
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l=l.replace(p[0],p[1])
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if options.env:
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var_list=[m.group(0) for m in re.finditer('\${[^ ]+}', l)]
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for v in var_list:
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l=l.replace(v,os.environ.get(v[:-1][2:],""))
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sys.stdout.write(l)
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