101 lines
2.7 KiB
Python
Executable File
101 lines
2.7 KiB
Python
Executable File
#!/usr/bin/env python3
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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(
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description="""Template Filler
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=== Template example: ===
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Hello [[name]]!
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[[letter]]
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== Value file/Value pair example: ==
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[[name]]=John
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[[letter]]=@letter.txt
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""",
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formatter_class = RawTextHelpFormatter
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)
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parser.add_argument(
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"-e",
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action = "store_true",
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dest = "env",
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default = False,
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help = "Use the environment to replace ${env} style variables."
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)
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parser.add_argument(
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"-f",
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action = "store",
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dest = "file",
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help = "File name to read keys/values."
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)
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parser.add_argument(
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"-p",
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action = "append",
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dest = "values",
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default = [],
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help = "key=value pairs. This option may be issued several times."
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)
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parser.add_argument(
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'template',
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action = "store",
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nargs = '?',
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help = "Template file to be filled. If not defined, stdin used."
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)
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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"%(
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filename, i+1, l,
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))
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sys.exit(1)
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pairs.append( (tokens[0], tokens[1]) )
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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]) )
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return pairs
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if __name__ == "__main__":
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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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value = p[1]
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if len(value) > 0:
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if value[0] == "@":
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value = open(value[1:], 'rt').read()
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elif value[0:2] == "\\@":
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value = value[1:]
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l = l.replace(p[0], value)
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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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