Fish shell - Load environment variables from file

In many places, you can find environment files, with the following structure:

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FOO1=BAR1
FOO2=BAR2

When you try to evaluate, this file using source command, you get an error with the fish shell.

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$ source web.env
Unsupported use of '='. In fish, please use 'set FOO1 BAR1'.

This is very annoying, so I’ve decided to write a function that can read this file and load those variables. Here is how you can use it:

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$ posix-source web.env
$ echo $FOO1
BAR1

The source code of this function. Enjoy:

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$ cat .config/fish/functions/posix-source.fish
function posix-source
for i in (cat $argv)
set arr (echo $i |tr = \n)
set -gx $arr[1] $arr[2]
end
end

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