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## compare_shells: bash dash mksh
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## oils_failures_allowed: 8
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# NOTE on bash bug: After setting IFS to array, it never splits anymore? Even
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# if you assign IFS again.
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#### IFS is scoped
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IFS=b
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word=abcd
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f() { local IFS=c; argv.py $word; }
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f
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argv.py $word
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## stdout-json: "['ab', 'd']\n['a', 'cd']\n"
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#### Tilde sub is not split, but var sub is
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HOME="foo bar"
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argv.py ~
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argv.py $HOME
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## stdout-json: "['foo bar']\n['foo', 'bar']\n"
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#### Word splitting
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a="1 2"
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b="3 4"
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argv.py $a"$b"
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## stdout-json: "['1', '23 4']\n"
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#### Word splitting 2
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a="1 2"
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b="3 4"
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c="5 6"
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d="7 8"
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argv.py $a"$b"$c"$d"
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## stdout-json: "['1', '23 45', '67 8']\n"
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# Has tests on differences between $* "$*" $@ "$@"
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# http://stackoverflow.com/questions/448407/bash-script-to-receive-and-repass-quoted-parameters
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#### $*
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fun() { argv.py -$*-; }
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fun "a 1" "b 2" "c 3"
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## stdout: ['-a', '1', 'b', '2', 'c', '3-']
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#### "$*"
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fun() { argv.py "-$*-"; }
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fun "a 1" "b 2" "c 3"
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## stdout: ['-a 1 b 2 c 3-']
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#### $@
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# How does this differ from $* ? I don't think it does.
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fun() { argv.py -$@-; }
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fun "a 1" "b 2" "c 3"
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## stdout: ['-a', '1', 'b', '2', 'c', '3-']
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#### "$@"
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fun() { argv.py "-$@-"; }
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fun "a 1" "b 2" "c 3"
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## stdout: ['-a 1', 'b 2', 'c 3-']
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#### empty argv
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argv.py 1 "$@" 2 $@ 3 "$*" 4 $* 5
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## stdout: ['1', '2', '3', '', '4', '5']
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#### Word elision with space
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s1=' '
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argv.py $s1
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## stdout: []
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#### Word elision with non-whitespace IFS
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# Treated differently than the default IFS. What is the rule here?
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IFS='_'
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char='_'
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space=' '
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empty=''
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argv.py $char
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argv.py $space
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argv.py $empty
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## STDOUT:
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['']
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[' ']
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[]
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## END
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#### Leading/trailing word elision with non-whitespace IFS
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# This behavior is weird.
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IFS=_
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s1='_a_b_'
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argv.py $s1
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## stdout: ['', 'a', 'b']
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#### Leading ' ' vs leading ' _ '
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# This behavior is weird, but all shells agree.
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IFS='_ '
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s1='_ a b _ '
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s2=' a b _ '
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argv.py $s1
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argv.py $s2
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## STDOUT:
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['', 'a', 'b']
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['a', 'b']
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## END
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#### Multiple non-whitespace IFS chars.
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IFS=_-
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s1='a__b---c_d'
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argv.py $s1
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## stdout: ['a', '', 'b', '', '', 'c', 'd']
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#### IFS with whitespace and non-whitepace.
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# NOTE: Three delimiters means two empty words in the middle. No elision.
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IFS='_ '
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s1='a_b _ _ _ c _d e'
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argv.py $s1
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## stdout: ['a', 'b', '', '', 'c', 'd', 'e']
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#### empty $@ and $* is elided
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fun() { argv.py 1 $@ $* 2; }
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fun
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## stdout: ['1', '2']
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#### unquoted empty arg is elided
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empty=""
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argv.py 1 $empty 2
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## stdout: ['1', '2']
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#### unquoted whitespace arg is elided
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space=" "
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argv.py 1 $space 2
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## stdout: ['1', '2']
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#### empty literals are not elided
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space=" "
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argv.py 1 $space"" 2
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## stdout: ['1', '', '2']
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#### no splitting when IFS is empty
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IFS=""
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foo="a b"
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argv.py $foo
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## stdout: ['a b']
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#### default value can yield multiple words
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argv.py 1 ${undefined:-"2 3" "4 5"} 6
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## stdout: ['1', '2 3', '4 5', '6']
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#### default value can yield multiple words with part joining
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argv.py 1${undefined:-"2 3" "4 5"}6
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## stdout: ['12 3', '4 56']
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#### default value with unquoted IFS char
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IFS=_
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argv.py 1${undefined:-"2_3"x_x"4_5"}6
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## stdout: ['12_3x', 'x4_56']
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#### IFS empty doesn't do splitting
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IFS=''
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x=$(echo -e ' a b\tc\n')
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argv.py $x
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## STDOUT:
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[' a b\tc']
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## END
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## N-I dash STDOUT:
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['-e a b\tc']
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## END
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#### IFS unset behaves like $' \t\n'
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unset IFS
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x=$(echo -e ' a b\tc\n')
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argv.py $x
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## STDOUT:
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['a', 'b', 'c']
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## END
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## N-I dash STDOUT:
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['-e', 'a', 'b', 'c']
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## END
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#### IFS='\'
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# NOTE: OSH fails this because of double backslash escaping issue!
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IFS='\'
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s='a\b'
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argv.py $s
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## STDOUT:
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['a', 'b']
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## END
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#### IFS='\ '
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# NOTE: OSH fails this because of double backslash escaping issue!
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# When IFS is \, then you're no longer using backslash escaping.
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IFS='\ '
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s='a\b \\ c d\'
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argv.py $s
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## STDOUT:
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['a', 'b', '', 'c', 'd']
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## END
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#### IFS characters are glob metacharacters
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IFS='* '
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s='a*b c'
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argv.py $s
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IFS='?'
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s='?x?y?z?'
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argv.py $s
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IFS='['
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s='[x[y[z['
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argv.py $s
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## STDOUT:
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['a', 'b', 'c']
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['', 'x', 'y', 'z']
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['', 'x', 'y', 'z']
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## END
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#### Trailing space
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argv.py 'Xec ho '
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argv.py X'ec ho '
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argv.py X"ec ho "
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## STDOUT:
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['Xec ho ']
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['Xec ho ']
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['Xec ho ']
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## END
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#### Empty IFS (regression for bug)
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IFS=
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echo ["$*"]
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set a b c
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echo ["$*"]
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## STDOUT:
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[]
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[abc]
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## END
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#### Unset IFS (regression for bug)
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set a b c
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unset IFS
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echo ["$*"]
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## STDOUT:
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[a b c]
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## END
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#### IFS=o (regression for bug)
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IFS=o
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echo hi
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## STDOUT:
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hi
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## END
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#### IFS and joining arrays
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IFS=:
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set -- x 'y z'
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argv.py "$@"
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argv.py $@
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argv.py "$*"
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argv.py $*
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## STDOUT:
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['x', 'y z']
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['x', 'y z']
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['x:y z']
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['x', 'y z']
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## END
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#### IFS and joining arrays by assignments
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IFS=:
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set -- x 'y z'
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s="$@"
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argv.py "$s"
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s=$@
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argv.py "$s"
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s"$*"
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argv.py "$s"
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s=$*
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argv.py "$s"
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# bash and mksh agree, but this doesn't really make sense to me.
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# In OSH, "$@" is the only real array, so that's why it behaves differently.
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## STDOUT:
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['x y z']
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['x y z']
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['x y z']
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['x:y z']
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## END
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## OK dash STDOUT:
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['x:y z']
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['x:y z']
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['x:y z']
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['x:y z']
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## END
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# TODO:
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# - unquoted args of whitespace are not elided (when IFS = null)
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# - empty quoted args are kept
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#
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# - $* $@ with empty IFS
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# - $* $@ with custom IFS
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#
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# - no splitting when IFS is empty
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# - word splitting removes leading and trailing whitespace
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# TODO: test framework needs common setup
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# Test IFS and $@ $* on all these
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#### TODO
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empty=""
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space=" "
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AB="A B"
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X="X"
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Yspaces=" Y "
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#### IFS='' with $@ and $* (bug #627)
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set -- a 'b c'
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IFS=''
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argv.py at $@
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argv.py star $*
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# zsh agrees
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## STDOUT:
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['at', 'a', 'b c']
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['star', 'a', 'b c']
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## END
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## BUG ash STDOUT:
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['at', 'ab c']
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['star', 'ab c']
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## END
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#### IFS='' with $@ and $* and printf (bug #627)
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set -- a 'b c'
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IFS=''
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printf '[%s]\n' $@
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printf '[%s]\n' $*
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## STDOUT:
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[a]
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[b c]
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[a]
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[b c]
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## END
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## BUG ash STDOUT:
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[ab c]
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[ab c]
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## END
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#### IFS='' with ${a[@]} and ${a[*]} (bug #627)
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myarray=(a 'b c')
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IFS=''
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argv.py at ${myarray[@]}
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argv.py star ${myarray[*]}
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## STDOUT:
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['at', 'a', 'b c']
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['star', 'a', 'b c']
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## END
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## N-I dash/ash status: 2
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## N-I dash/ash stdout-json: ""
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#### Bug #628 split on : with : in literal word
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IFS=':'
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word='a:'
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argv.py ${word}:b
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argv.py ${word}:
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echo ---
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# Same thing happens for 'z'
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IFS='z'
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word='az'
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argv.py ${word}zb
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argv.py ${word}z
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## STDOUT:
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['a', ':b']
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['a', ':']
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---
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['a', 'zb']
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['a', 'z']
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## END
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#### Bug #698, similar crash
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var='\'
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set -f
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echo $var
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## STDOUT:
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\
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## END
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#### Bug #1664, \\ with noglob
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# Note that we're not changing IFS
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argv.py [\\]_
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argv.py "[\\]_"
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# TODO: no difference observed here, go back to original bug
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#argv.py [\\_
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#argv.py "[\\_"
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echo noglob
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# repeat cases with -f, noglob
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set -f
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argv.py [\\]_
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argv.py "[\\]_"
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#argv.py [\\_
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#argv.py "[\\_"
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## STDOUT:
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['[\\]_']
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['[\\]_']
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noglob
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['[\\]_']
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['[\\]_']
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## END
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