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Commit73dba5a

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echo: Add echo.py and test script
1 parent03a6c1a commit73dba5a

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2 files changed

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2 files changed

+142
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‎src/echo.py‎

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#!/usr/bin/python3
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importcodecs
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importre
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fromoptparseimportOptionParser,BadOptionError,AmbiguousOptionError
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ESCAPES_PATTERN=re.compile(
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r"(\\0[0-7]{1,3}|\\x[0-9A-Za-z]{1,2}|\\[\\0abcefnrtv])",
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re.UNICODE|re.VERBOSE,
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)
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classPassthroughOptionParser(OptionParser):
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"""
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A modified version of OptionParser that treats unknown options and "--" as
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regular arguments. Always behaves as if interspersed args are disabled.
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"""
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def_process_args(self,largs,rargs,values):
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parsing_options=True
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forarginrargs:
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ifparsing_optionsandargandarg[0]=="-"andarg!="--":
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try:
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super()._process_args([], [arg],values)
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except (BadOptionError,AmbiguousOptionError)ase:
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parsing_options=False
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largs.append(e.opt_str)
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else:
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parsing_options=False
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largs.append(arg)
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rargs.clear()
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defecho(opts,args):
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string=" ".join(args)
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ifopts.escapes:
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defdecode_match(match:re.Match[str])->str:
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try:
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if (escape:=match.group(0))[1]=="0"andlen(escape)>2:
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# Convert octal escapes from "\0NNN" to Python's form
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# ("\NNN" without the "0").
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escape="\\"+escape[2:]
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returncodecs.decode(escape,"unicode_escape")
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exceptUnicodeDecodeError:
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returnmatch.group(0)
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string=ESCAPES_PATTERN.sub(decode_match,string)
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print(string,end=""ifopts.nelse"\n")
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if__name__=="__main__":
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parser=PassthroughOptionParser(
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usage="Usage: %prog [OPTION]... [STRING]...",
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description="Print STRING(s) to standard output.",
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add_help_option=False,
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)
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parser.disable_interspersed_args()
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parser.add_option("--help",action="help",help="show usage information and exit")
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parser.add_option(
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"-n",action="store_true",help="do not output the trailing newline"
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)
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parser.add_option(
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"-e",
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dest="escapes",
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action="store_true",
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help="enable interpretation of backslash escapes",
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)
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parser.add_option(
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"-E",
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dest="escapes",
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action="store_false",
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default=False,
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help="disable interpretation of backslash escapes (default)",
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)
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echo(*parser.parse_args())

‎tests/echo.sh‎

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#!/usr/bin/env sh
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set -eux
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## basic echo
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result="$(./echo.py foo bar)"
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test"${result}" ='foo bar'
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## double hyphen
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result="$(./echo.py -- foo)"
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test"${result}" ='-- foo'
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## multiple double hyphens
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result="$(./echo.py -- foo --)"
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test"${result}" ='-- foo --'
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## unknown option
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result="$(./echo.py -x foo)"
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test"${result}" ='-x foo'
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## unknown option and double hyphen
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result="$(./echo.py -x -- foo)"
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test"${result}" ='-x -- foo'
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## escape codes
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result="$(./echo.py -e'foo \x41''\0102')"
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test"${result}" ='foo A B'
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## no arguments
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result="$(./echo.py)"
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test"${result}" ="$(printf'\n')"
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## empty arguments
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result="$(./echo.py'' foo'' bar'''')"
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test"${result}" =' foo bar'
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## no trailing newline
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n_lines="$(./echo.py -n'foo'| wc -l)"
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test"${n_lines}" = 0
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exit 0

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