Shell pattern quote/escape fuzzer.

pattest.py

#!/usr/bin/env python3

import subprocess, itertools

class Shell(list):
    def __init__(self, shell, cmds):
        self.shell = shell
        super().__init__([(x, self.__run(x)) for x in cmds])

    def __iter__(self):
        while True:
            try:
                self[0][1].communicate()
                yield (lambda x: (x[0], x[1].returncode, self.shell))(self.pop(0))
            except IndexError:
                raise StopIteration()
        
    def __run(self, cmd):
        return subprocess.Popen([self.shell, "-c", cmd])

def main():
    template = r'x=\\; case \\x in {0}{1}x) :;; *) false; esac'
    tests = [template.format(*x) for x in itertools.product(['"${x}"', '${x}', r'"\\"', r'\\'], repeat=2)]
    shells = [Shell(x, tests) for x in ["bash", "dash", "ksh", "mksh", "zsh", "bb", "posh", "jsh"]]

    print(" " * 54, " ".join(x.shell for x in shells))
    for row in zip(*shells):
        print("{0:55}{1}".format(row[0][0], "".join(str(test) + (" " * len(shell)) for x, test, shell in row)))

if __name__ == "__main__":
    main()

#                                                        bash dash ksh mksh zsh bb posh jsh
# x=\\; case \\x in "${x}""${x}"x) :;; *) false; esac    1    1    1   1    1   1  1    1   
# x=\\; case \\x in "${x}"${x}x) :;; *) false; esac      0    0    1   1    1   1  1    1   
# x=\\; case \\x in "${x}""\\"x) :;; *) false; esac      1    1    1   1    1   1  1    1   
# x=\\; case \\x in "${x}"\\x) :;; *) false; esac        1    1    1   1    1   1  1    1   
# x=\\; case \\x in ${x}"${x}"x) :;; *) false; esac      1    0    1   1    1   1  1    1   
# x=\\; case \\x in ${x}${x}x) :;; *) false; esac        0    0    1   1    1   1  1    1   
# x=\\; case \\x in ${x}"\\"x) :;; *) false; esac        1    0    1   1    1   1  1    1   
# x=\\; case \\x in ${x}\\x) :;; *) false; esac          1    0    1   1    1   1  1    1   
# x=\\; case \\x in "\\""${x}"x) :;; *) false; esac      1    1    1   1    1   1  1    1   
# x=\\; case \\x in "\\"${x}x) :;; *) false; esac        0    0    1   1    1   1  1    1   
# x=\\; case \\x in "\\""\\"x) :;; *) false; esac        1    1    1   1    1   1  1    1   
# x=\\; case \\x in "\\"\\x) :;; *) false; esac          1    1    1   1    1   1  1    1   
# x=\\; case \\x in \\"${x}"x) :;; *) false; esac        1    1    1   1    1   1  1    1   
# x=\\; case \\x in \\${x}x) :;; *) false; esac          0    0    1   1    1   1  1    1   
# x=\\; case \\x in \\"\\"x) :;; *) false; esac          1    1    1   1    1   1  1    1   
# x=\\; case \\x in \\\\x) :;; *) false; esac            1    1    1   1    1   1  1    1   

# vim: set fenc=utf-8 ff=unix ft=python ts=4 sts=4 sw=4 nowrap et: