This content originally appeared on DEV Community and was authored by Myoungjin Jeon
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
end
end
~> elem 1 1 2 3
~> echo $status
0
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]
end
end
So, we can append a path safely now.
# middle of ~/.config/fish/config.fish
for p in ~/perl5/bin ~/.local/share/go/bin ~/.ghcup/bin \
~/.cabal/bin
append_to_path $p
end
Thank you for reading!
If you would like to know more about fish function
please visit my blog post, please.
This content originally appeared on DEV Community and was authored by Myoungjin Jeon
Myoungjin Jeon | Sciencx (2022-04-21T11:03:13+00:00) Fish Shell Function. Retrieved from https://www.scien.cx/2022/04/21/fish-shell-function/
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