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April 21, 2022 11:03 am GMT

Fish Shell Function

My PATH has so duplicated paths

I was cleaning up my PATH environment value yesterday
and I found my path has so many duplicated paths inside.

My duplicated PATH env.

~> set -S PATH$PATH: set in global scope, exported, a path variable with 27 elements$PATH[1]: |/home/myoungjin/.local/share/go/bin|$PATH[2]: |/home/myoungjin/.local/share/rakudo/share/perl6/site/bin|$PATH[3]: |/home/myoungjin/.local/share/rakudo/bin|$PATH[4]: |/home/myoungjin/.rakudo/install/share/perl6/site/bin|$PATH[5]: |/home/myoungjin/.rakudo/install/bin|$PATH[6]: |/home/myoungjin/.ghcup/bin|$PATH[7]: |/home/myoungjin/.local/bin|$PATH[8]: |/home/myoungjin/perl5/bin|$PATH[9]: |/home/myoungjin/sbin|$PATH[10]: |/home/myoungjin/bin|$PATH[11]: |/home/myoungjin/perl5/bin|$PATH[12]: |/home/myoungjin/bin|$PATH[13]: |/home/myoungjin/.local/share/go/bin|$PATH[14]: |/home/myoungjin/.local/share/rakudo/share/perl6/site/bin|$PATH[15]: |/home/myoungjin/.local/share/rakudo/bin|$PATH[16]: |/home/myoungjin/.rakudo/install/share/perl6/site/bin|$PATH[17]: |/home/myoungjin/.rakudo/install/bin|$PATH[18]: |/home/myoungjin/.ghcup/bin|$PATH[19]: |/home/myoungjin/.local/bin|$PATH[20]: |/home/myoungjin/perl5/bin|$PATH[21]: |/home/myoungjin/sbin|$PATH[22]: |/home/myoungjin/bin|$PATH[23]: |/usr/local/bin|$PATH[24]: |/usr/bin|$PATH[25]: |/usr/bin/site_perl|$PATH[26]: |/usr/bin/vendor_perl|$PATH[27]: |/usr/bin/core_perl|

Starting making block of code (function)

So I found that when I added some new path for my apps in new PATH, I hadn't check its possibility of existence already in there.

There are millions of way to check. A famous way maybe done
by external programme.

function elem_ -d 'find first value is in the list of rest values'    # note: fish index start from 1    for p in $argv[2..-1]; echo $p; end | grep -q $argv[1]end

But how about just using pure fish shell script byuse basic
array of fish provides. so my first try was like

function elem -d 'find first value is in the list of rest values'    set found 0    for arg in $argv[2..-1]        if test $found -eq 0 && test $arg = $argv[1]            set found 1            break        end    end    if test $found -eq 1        true    else        false    endend~> elem 1 1 2 3~> echo $status0

Add A function in your fish shell permanently

now you can make a file which has file path of
~/.config/fish/functions/elem.fish

so that you can use it whenever you want to use it.

Now, we did make how to check, we could make append_to_path or prepend_to_path function like this.

~/.config/functions/fish/append_to_path.fish

function append_to_path -d 'append given path into PATH environment variable with checking '    if ! elem $argv[1] $PATH        set -x --append PATH $argv[1]    endend

So, we can append a path safely now.

# middle of ~/.config/fish/config.fishfor p in ~/perl5/bin ~/.local/share/go/bin ~/.ghcup/bin \         ~/.cabal/bin    append_to_path $pend

Thank you for reading!

If you would like to know more about fish function
please visit my blog post, please.


Original Link: https://dev.to/jeongoon/fish-shell-function-p2l

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