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 by using basic
array that 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.
Top comments (2)
Nice article :)
But I believe that there is a built-in function that does this: fish_add_path
fishshell.com/docs/current/cmds/fi...
"If a component already exists, it is not added again and stays in the same place unless the --move switch is given."
oh, thank you!
It has been added since 1 year ago already.
github.com/fish-shell/fish-shell/b...
I think I lived in the past too long time.