prompt_pwd - Print pwd suitable for prompt
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Synopsis
--------

prompt_pwd


Description
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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.

Examples
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::

    >_ cd ~/
    >_ echo $PWD
    <outp>/home/alfa</outp>
    
    >_ prompt_pwd
    <outp>~</outp>
    
    >_ cd /tmp/banana/sausage/with/mustard
    >_ prompt_pwd
    <outp>/t/b/s/w/mustard</outp>
    
    >_ set -g fish_prompt_pwd_dir_length 3
    >_ prompt_pwd
    <outp>/tmp/ban/sau/wit/mustard</outp>

