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7d5b44e828
This adds initial support for statements with prefixed variable assignments.
Statments like this are supported:
a=1 b=$a echo $b # outputs 1
Just like in other shells, the left-hand side of each assignment must
be a valid variable identifier (no quoting/escaping). Array indexing
(PATH[1]=/bin ls $PATH) is *not* yet supported, but can be added fairly
easily.
The right hand side may be any valid string token, like a command
substitution, or a brace expansion.
Since `a=* foo` is equivalent to `begin set -lx a *; foo; end`,
the assignment, like `set`, uses nullglob behavior, e.g. below command
can safely be used to check if a directory is empty.
x=/nothing/{,.}* test (count $x) -eq 0
Generic file completion is done after the equal sign, so for example
pressing tab after something like `HOME=/` completes files in the
root directory
Subcommand completion works, so something like
`GIT_DIR=repo.git and command git ` correctly calls git completions
(but the git completion does not use the variable as of now).
The variable assignment is highlighted like an argument.
Closes #6048
79 lines
1.2 KiB
Fish
79 lines
1.2 KiB
Fish
# RUN: %fish %s
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# erase all lowercase variables to make sure they don't break our tests
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for varname in (set -xn | string match -r '^[a-z].*')
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while set -q $varname
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set -e $varname
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end
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end
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# CHECK: bar
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foo=bar echo $foo
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# CHECK: nil
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set -q foo; or echo nil
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# CHECK: lx
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foo=bar set -qlx foo; and echo lx
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# CHECK: 3
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a={1, 2, 3} count $a
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# CHECK: 1+2+3
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a={1, 2, 3} string join + $a
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# CHECK: 1 2 3
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a=(echo 1 2 3) echo $a
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# CHECK: a a2
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a=a b={$a}2 echo $a $b
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# CHECK: a
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a=a builtin echo $a
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# CHECK: 0
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a=failing-glob-* count $a
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# CHECK: ''
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a=b true | echo "'$a'"
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if a=b true
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# CHECK: ''
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echo "'$a'"
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end
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# CHECK: b
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not a=b echo $a
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# CHECK: b
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a=b not echo $a
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# CHECK: b
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a=b not builtin echo $a
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# CHECK: /usr/bin:/bin
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xPATH={/usr,}/bin sh -c 'echo $xPATH'
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# CHECK: 2
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yPATH=/usr/bin:/bin count $yPATH
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# CHECK: b
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a=b begin; true | echo $a; end
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# CHECK: b
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a=b if true; echo $a; end
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# CHECK: b
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a=b switch x; case x; echo $a; end
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complete -c x --erase
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complete -c x -xa arg
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complete -C' a=b x ' # Mind the leading space.
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# CHECK: arg
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alias xalias=x
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complete -C'a=b xalias '
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# CHECK: arg
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alias envxalias='a=b x'
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complete -C'a=b envxalias '
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# CHECK: arg
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