| 1 | ## compare_shells: bash dash mksh ash yash
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| 2 | ## oils_failures_allowed: 10
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| 3 |
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| 4 | # NOTE on bash bug: After setting IFS to array, it never splits anymore? Even
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| 5 | # if you assign IFS again.
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| 6 |
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| 7 | #### IFS is scoped
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| 8 | IFS=b
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| 9 | word=abcd
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| 10 | f() { local IFS=c; argv.py $word; }
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| 11 | f
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| 12 | argv.py $word
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| 13 | ## stdout-json: "['ab', 'd']\n['a', 'cd']\n"
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| 14 |
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| 15 | #### Tilde sub is not split, but var sub is
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| 16 | HOME="foo bar"
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| 17 | argv.py ~
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| 18 | argv.py $HOME
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| 19 | ## stdout-json: "['foo bar']\n['foo', 'bar']\n"
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| 20 |
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| 21 | #### Word splitting
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| 22 | a="1 2"
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| 23 | b="3 4"
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| 24 | argv.py $a"$b"
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| 25 | ## stdout-json: "['1', '23 4']\n"
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| 26 |
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| 27 | #### Word splitting 2
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| 28 | a="1 2"
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| 29 | b="3 4"
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| 30 | c="5 6"
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| 31 | d="7 8"
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| 32 | argv.py $a"$b"$c"$d"
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| 33 | ## stdout-json: "['1', '23 45', '67 8']\n"
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| 34 |
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| 35 | # Has tests on differences between $* "$*" $@ "$@"
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| 36 | # http://stackoverflow.com/questions/448407/bash-script-to-receive-and-repass-quoted-parameters
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| 37 |
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| 38 | #### $*
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| 39 | fun() { argv.py -$*-; }
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| 40 | fun "a 1" "b 2" "c 3"
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| 41 | ## stdout: ['-a', '1', 'b', '2', 'c', '3-']
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| 42 |
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| 43 | #### "$*"
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| 44 | fun() { argv.py "-$*-"; }
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| 45 | fun "a 1" "b 2" "c 3"
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| 46 | ## stdout: ['-a 1 b 2 c 3-']
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| 47 |
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| 48 | #### $@
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| 49 | # How does this differ from $* ? I don't think it does.
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| 50 | fun() { argv.py -$@-; }
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| 51 | fun "a 1" "b 2" "c 3"
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| 52 | ## stdout: ['-a', '1', 'b', '2', 'c', '3-']
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| 53 |
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| 54 | #### "$@"
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| 55 | fun() { argv.py "-$@-"; }
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| 56 | fun "a 1" "b 2" "c 3"
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| 57 | ## stdout: ['-a 1', 'b 2', 'c 3-']
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| 58 |
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| 59 | #### empty argv
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| 60 | argv.py 1 "$@" 2 $@ 3 "$*" 4 $* 5
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| 61 | ## stdout: ['1', '2', '3', '', '4', '5']
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| 62 |
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| 63 | #### Word elision with space
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| 64 | s1=' '
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| 65 | argv.py $s1
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| 66 | ## stdout: []
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| 67 |
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| 68 | #### Word elision with non-whitespace IFS
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| 69 | # Treated differently than the default IFS. What is the rule here?
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| 70 | IFS='_'
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| 71 | char='_'
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| 72 | space=' '
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| 73 | empty=''
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| 74 | argv.py $char
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| 75 | argv.py $space
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| 76 | argv.py $empty
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| 77 | ## STDOUT:
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| 78 | ['']
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| 79 | [' ']
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| 80 | []
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| 81 | ## END
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| 82 | ## BUG yash STDOUT:
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| 83 | []
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| 84 | [' ']
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| 85 | []
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| 86 | ## END
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| 87 |
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| 88 | #### Leading/trailing word elision with non-whitespace IFS
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| 89 | # This behavior is weird.
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| 90 | IFS=_
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| 91 | s1='_a_b_'
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| 92 | argv.py $s1
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| 93 | ## stdout: ['', 'a', 'b']
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| 94 |
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| 95 | #### Leading ' ' vs leading ' _ '
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| 96 | # This behavior is weird, but all shells agree.
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| 97 | IFS='_ '
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| 98 | s1='_ a b _ '
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| 99 | s2=' a b _ '
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| 100 | argv.py $s1
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| 101 | argv.py $s2
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| 102 | ## STDOUT:
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| 103 | ['', 'a', 'b']
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| 104 | ['a', 'b']
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| 105 | ## END
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| 106 |
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| 107 | #### Multiple non-whitespace IFS chars.
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| 108 | IFS=_-
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| 109 | s1='a__b---c_d'
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| 110 | argv.py $s1
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| 111 | ## stdout: ['a', '', 'b', '', '', 'c', 'd']
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| 112 |
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| 113 | #### IFS with whitespace and non-whitepace.
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| 114 | # NOTE: Three delimiters means two empty words in the middle. No elision.
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| 115 | IFS='_ '
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| 116 | s1='a_b _ _ _ c _d e'
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| 117 | argv.py $s1
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| 118 | ## stdout: ['a', 'b', '', '', 'c', 'd', 'e']
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| 119 |
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| 120 | #### empty $@ and $* is elided
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| 121 | fun() { argv.py 1 $@ $* 2; }
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| 122 | fun
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| 123 | ## stdout: ['1', '2']
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| 124 |
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| 125 | #### unquoted empty arg is elided
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| 126 | empty=""
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| 127 | argv.py 1 $empty 2
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| 128 | ## stdout: ['1', '2']
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| 129 |
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| 130 | #### unquoted whitespace arg is elided
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| 131 | space=" "
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| 132 | argv.py 1 $space 2
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| 133 | ## stdout: ['1', '2']
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| 134 |
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| 135 | #### empty literals are not elided
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| 136 | space=" "
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| 137 | argv.py 1 $space"" 2
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| 138 | ## stdout: ['1', '', '2']
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| 139 |
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| 140 | #### no splitting when IFS is empty
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| 141 | IFS=""
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| 142 | foo="a b"
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| 143 | argv.py $foo
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| 144 | ## stdout: ['a b']
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| 145 |
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| 146 | #### default value can yield multiple words
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| 147 | argv.py 1 ${undefined:-"2 3" "4 5"} 6
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| 148 | ## stdout: ['1', '2 3', '4 5', '6']
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| 149 |
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| 150 | #### default value can yield multiple words with part joining
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| 151 | argv.py 1${undefined:-"2 3" "4 5"}6
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| 152 | ## stdout: ['12 3', '4 56']
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| 153 |
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| 154 | #### default value with unquoted IFS char
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| 155 | IFS=_
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| 156 | argv.py 1${undefined:-"2_3"x_x"4_5"}6
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| 157 | ## stdout: ['12_3x', 'x4_56']
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| 158 |
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| 159 | #### IFS empty doesn't do splitting
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| 160 | IFS=''
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| 161 | x=$(python2 -c 'print(" a b\tc\n")')
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| 162 | argv.py $x
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| 163 | ## STDOUT:
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| 164 | [' a b\tc']
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| 165 | ## END
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| 166 |
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| 167 | #### IFS unset behaves like $' \t\n'
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| 168 | unset IFS
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| 169 | x=$(python2 -c 'print(" a b\tc\n")')
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| 170 | argv.py $x
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| 171 | ## STDOUT:
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| 172 | ['a', 'b', 'c']
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| 173 | ## END
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| 174 |
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| 175 | #### IFS='\'
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| 176 | # NOTE: OSH fails this because of double backslash escaping issue!
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| 177 | IFS='\'
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| 178 | s='a\b'
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| 179 | argv.py $s
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| 180 | ## STDOUT:
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| 181 | ['a', 'b']
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| 182 | ## END
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| 183 |
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| 184 | #### IFS='\ '
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| 185 | # NOTE: OSH fails this because of double backslash escaping issue!
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| 186 | # When IFS is \, then you're no longer using backslash escaping.
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| 187 | IFS='\ '
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| 188 | s='a\b \\ c d\'
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| 189 | argv.py $s
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| 190 | ## STDOUT:
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| 191 | ['a', 'b', '', 'c', 'd']
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| 192 | ## END
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| 193 |
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| 194 | #### IFS characters are glob metacharacters
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| 195 | IFS='* '
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| 196 | s='a*b c'
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| 197 | argv.py $s
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| 198 |
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| 199 | IFS='?'
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| 200 | s='?x?y?z?'
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| 201 | argv.py $s
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| 202 |
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| 203 | IFS='['
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| 204 | s='[x[y[z['
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| 205 | argv.py $s
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| 206 | ## STDOUT:
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| 207 | ['a', 'b', 'c']
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| 208 | ['', 'x', 'y', 'z']
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| 209 | ['', 'x', 'y', 'z']
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| 210 | ## END
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| 211 |
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| 212 | #### Trailing space
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| 213 | argv.py 'Xec ho '
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| 214 | argv.py X'ec ho '
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| 215 | argv.py X"ec ho "
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| 216 | ## STDOUT:
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| 217 | ['Xec ho ']
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| 218 | ['Xec ho ']
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| 219 | ['Xec ho ']
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| 220 | ## END
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| 221 |
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| 222 | #### Empty IFS (regression for bug)
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| 223 | IFS=
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| 224 | echo ["$*"]
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| 225 | set a b c
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| 226 | echo ["$*"]
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| 227 | ## STDOUT:
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| 228 | []
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| 229 | [abc]
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| 230 | ## END
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| 231 |
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| 232 | #### Unset IFS (regression for bug)
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| 233 | set a b c
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| 234 | unset IFS
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| 235 | echo ["$*"]
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| 236 | ## STDOUT:
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| 237 | [a b c]
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| 238 | ## END
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| 239 |
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| 240 | #### IFS=o (regression for bug)
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| 241 | IFS=o
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| 242 | echo hi
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| 243 | ## STDOUT:
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| 244 | hi
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| 245 | ## END
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| 246 |
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| 247 | #### IFS and joining arrays
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| 248 | IFS=:
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| 249 | set -- x 'y z'
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| 250 | argv.py "$@"
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| 251 | argv.py $@
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| 252 | argv.py "$*"
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| 253 | argv.py $*
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| 254 | ## STDOUT:
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| 255 | ['x', 'y z']
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| 256 | ['x', 'y z']
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| 257 | ['x:y z']
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| 258 | ['x', 'y z']
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| 259 | ## END
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| 260 |
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| 261 | #### IFS and joining arrays by assignments
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| 262 | IFS=:
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| 263 | set -- x 'y z'
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| 264 |
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| 265 | s="$@"
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| 266 | argv.py "$s"
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| 267 |
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| 268 | s=$@
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| 269 | argv.py "$s"
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| 270 |
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| 271 | s"$*"
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| 272 | argv.py "$s"
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| 273 |
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| 274 | s=$*
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| 275 | argv.py "$s"
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| 276 |
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| 277 | # bash and mksh agree, but this doesn't really make sense to me.
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| 278 | # In OSH, "$@" is the only real array, so that's why it behaves differently.
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| 279 |
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| 280 | ## STDOUT:
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| 281 | ['x y z']
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| 282 | ['x y z']
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| 283 | ['x y z']
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| 284 | ['x:y z']
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| 285 | ## END
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| 286 | ## BUG dash/ash/yash STDOUT:
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| 287 | ['x:y z']
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| 288 | ['x:y z']
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| 289 | ['x:y z']
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| 290 | ['x:y z']
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| 291 | ## END
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| 292 |
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| 293 |
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| 294 | # TODO:
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| 295 | # - unquoted args of whitespace are not elided (when IFS = null)
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| 296 | # - empty quoted args are kept
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| 297 | #
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| 298 | # - $* $@ with empty IFS
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| 299 | # - $* $@ with custom IFS
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| 300 | #
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| 301 | # - no splitting when IFS is empty
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| 302 | # - word splitting removes leading and trailing whitespace
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| 303 |
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| 304 | # TODO: test framework needs common setup
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| 305 |
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| 306 | # Test IFS and $@ $* on all these
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| 307 | #### TODO
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| 308 | empty=""
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| 309 | space=" "
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| 310 | AB="A B"
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| 311 | X="X"
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| 312 | Yspaces=" Y "
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| 313 |
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| 314 |
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| 315 | #### IFS='' with $@ and $* (bug #627)
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| 316 | set -- a 'b c'
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| 317 | IFS=''
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| 318 | argv.py at $@
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| 319 | argv.py star $*
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| 320 |
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| 321 | # zsh agrees
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| 322 | ## STDOUT:
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| 323 | ['at', 'a', 'b c']
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| 324 | ['star', 'a', 'b c']
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| 325 | ## END
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| 326 |
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| 327 | #### IFS='' with $@ and $* and printf (bug #627)
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| 328 | set -- a 'b c'
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| 329 | IFS=''
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| 330 | printf '[%s]\n' $@
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| 331 | printf '[%s]\n' $*
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| 332 | ## STDOUT:
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| 333 | [a]
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| 334 | [b c]
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| 335 | [a]
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| 336 | [b c]
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| 337 | ## END
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| 338 |
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| 339 | #### IFS='' with ${a[@]} and ${a[*]} (bug #627)
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| 340 | myarray=(a 'b c')
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| 341 | IFS=''
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| 342 | argv.py at ${myarray[@]}
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| 343 | argv.py star ${myarray[*]}
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| 344 |
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| 345 | ## STDOUT:
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| 346 | ['at', 'a', 'b c']
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| 347 | ['star', 'a', 'b c']
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| 348 | ## END
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| 349 | ## N-I dash/ash status: 2
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| 350 | ## N-I dash/ash stdout-json: ""
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| 351 |
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| 352 | #### Bug #628 split on : with : in literal word
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| 353 | IFS=':'
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| 354 | word='a:'
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| 355 | argv.py ${word}:b
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| 356 | argv.py ${word}:
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| 357 |
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| 358 | echo ---
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| 359 |
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| 360 | # Same thing happens for 'z'
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| 361 | IFS='z'
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| 362 | word='az'
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| 363 | argv.py ${word}zb
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| 364 | argv.py ${word}z
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| 365 | ## STDOUT:
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| 366 | ['a', ':b']
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| 367 | ['a', ':']
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| 368 | ---
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| 369 | ['a', 'zb']
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| 370 | ['a', 'z']
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| 371 | ## END
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| 372 |
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| 373 | #### Bug #698, similar crash
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| 374 | var='\'
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| 375 | set -f
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| 376 | echo $var
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| 377 | ## STDOUT:
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| 378 | \
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| 379 | ## END
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| 380 |
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| 381 | #### Bug #1664, \\ with noglob
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| 382 |
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| 383 | # Note that we're not changing IFS
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| 384 |
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| 385 | argv.py [\\]_
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| 386 | argv.py "[\\]_"
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| 387 |
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| 388 | # TODO: no difference observed here, go back to original bug
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| 389 |
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| 390 | #argv.py [\\_
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| 391 | #argv.py "[\\_"
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| 392 |
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| 393 | echo noglob
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| 394 |
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| 395 | # repeat cases with -f, noglob
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| 396 | set -f
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| 397 |
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| 398 | argv.py [\\]_
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| 399 | argv.py "[\\]_"
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| 400 |
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| 401 | #argv.py [\\_
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| 402 | #argv.py "[\\_"
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| 403 |
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| 404 | ## STDOUT:
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| 405 | ['[\\]_']
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| 406 | ['[\\]_']
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| 407 | noglob
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| 408 | ['[\\]_']
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| 409 | ['[\\]_']
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| 410 | ## END
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| 411 |
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| 412 |
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| 413 | #### Empty IFS bug #2141 (from pnut)
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| 414 |
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| 415 | res=0
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| 416 | sum() {
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| 417 | # implement callee-save calling convention using `set`
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| 418 | # here, we save the value of $res after the function parameters
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| 419 | set $@ $res # $1 $2 $3 are now set
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| 420 | res=$(($1 + $2))
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| 421 | echo "$1 + $2 = $res"
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| 422 | res=$3 # restore the value of $res
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| 423 | }
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| 424 |
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| 425 | unset IFS
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| 426 | sum 12 30 # outputs "12 + 30 = 42"
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| 427 |
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| 428 | IFS=' '
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| 429 | sum 12 30 # outputs "12 + 30 = 42"
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| 430 |
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| 431 | IFS=
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| 432 | sum 12 30 # outputs "1230 + 0 = 1230"
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| 433 |
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| 434 | # I added this
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| 435 | IFS=''
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| 436 | sum 12 30
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| 437 |
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| 438 | set -u
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| 439 | IFS=
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| 440 | sum 12 30 # fails with "fatal: Undefined variable '2'" on res=$(($1 + $2))
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| 441 |
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| 442 | ## STDOUT:
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| 443 | 12 + 30 = 42
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| 444 | 12 + 30 = 42
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| 445 | 12 + 30 = 42
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| 446 | 12 + 30 = 42
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| 447 | 12 + 30 = 42
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| 448 | ## END
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| 449 |
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| 450 | #### Unicode in IFS
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| 451 |
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| 452 | # bash, zsh, and yash support unicode in IFS, but dash/mksh/ash don't.
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| 453 |
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| 454 | # for zsh, though we're not testing it here
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| 455 | setopt SH_WORD_SPLIT
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| 456 |
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| 457 | x=çx IFS=ç
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| 458 | printf "<%s>\n" $x
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| 459 |
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| 460 | ## STDOUT:
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| 461 | <>
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| 462 | <x>
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| 463 | ## END
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| 464 |
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| 465 | ## BUG dash/mksh/ash STDOUT:
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| 466 | <>
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| 467 | <>
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| 468 | <x>
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| 469 | ## END
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| 470 |
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