prompt_pwd - print pwd suitable for prompt
function fish_prompt
echo -n (prompt_pwd) '$ '
end
prompt_pwd is a function to print the current working directory in a way
suitable for prompts. It will replace the home directory with "~"
and shorten every path component but the last to a default of one character.
To change the number of characters per path component, set
$fish_prompt_pwd_dir_length to the number of characters. Setting it
to 0 or an invalid value will disable shortening entirely.
>_ cd ~/
>_ echo $PWD
/home/alfa
>_ prompt_pwd
~
>_ cd /tmp/banana/sausage/with/mustard
>_ prompt_pwd
/t/b/s/w/mustard
>_ set -g fish_prompt_pwd_dir_length 3
>_ prompt_pwd
/tmp/ban/sau/wit/mustard
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