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905766fca2
* Hoist `for` loop control var to enclosing scope It should be possible to reference the last value assigned to a `for` loop control var when the loop terminates. This makes it easier to detect if we broke out of the loop among other things. This change makes fish `for` loops behave like most other shells. Fixes #1935 * Remove redundant line
37 lines
1.4 KiB
Plaintext
37 lines
1.4 KiB
Plaintext
\section for for - perform a set of commands multiple times.
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\subsection for-synopsis Synopsis
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\fish{synopsis}
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for VARNAME in [VALUES...]; COMMANDS...; end
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\endfish
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\subsection for-description Description
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`for` is a loop construct. It will perform the commands specified by `COMMANDS` multiple times. On each iteration, the local variable specified by `VARNAME` is assigned a new value from `VALUES`. If `VALUES` is empty, `COMMANDS` will not be executed at all. The `VARNAME` is visible when the loop terminates and will contain the last value assigned to it. If `VARNAME` does not already exist it will be set in the local scope. For our purposes if the `for` block is inside a function there must be a local variable with the same name. If the `for` block is not nested inside a function then global and universal variables of the same name will be used if they exist.
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\subsection for-example Example
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\fish
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for i in foo bar baz; echo $i; end
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# would output:
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foo
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bar
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baz
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\endfish
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\subsection for-notes Notes
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The `VARNAME` was local to the for block in releases prior to 3.0.0. This means that if you did something like this:
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\fish
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for var in a b c
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if break_from_loop
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break
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end
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end
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echo $var
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\endfish
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The last value assigned to `var` when the loop terminated would not be available outside the loop. What `echo $var` would write depended on what it was set to before the loop was run. Likely nothing.
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