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#!/bin/bash
begin="" # The unshortened beginning of the path.
shortbegin="" # The shortened beginning of the path.
current="" # The section of the path we're currently working on.
end="${2:-$(pwd)}/" # The unmodified rest of the path.
if [[ "$end" =~ "$HOME" ]]; then
INHOME=1
end="${end#$HOME}" #strip /home/username from start of string
begin="$HOME" #start expansion from the right spot
else
INHOME=0
fi
end="${end#/}" # Strip the first /
shortenedpath="$end" # The whole path, to check the length.
maxlength="${1:-0}"
shopt -q nullglob && NGV="-s" || NGV="-u" # Store the value for later.
shopt -s nullglob # Without this, anything that doesn't exist in the filesystem turns into */*/*/...
while [[ "$end" ]] && (( ${#shortenedpath} > maxlength ))
do
current="${end%%/*}" # everything before the first /
end="${end#*/}" # everything after the first /
shortcur="$current"
shortcurstar="$current" # No star if we don't shorten it.
for ((i=${#current}-2; i>=0; i--)); do
subcurrent="${current:0:i}"
matching=("$begin/$subcurrent"*) # Array of all files that start with $subcurrent.
(( ${#matching[*]} != 1 )) && break # Stop shortening if more than one file matches.
shortcur="$subcurrent"
shortcurstar="$subcurrent*"
done
#advance
begin="$begin/$current"
shortbegin="$shortbegin/$shortcurstar"
shortenedpath="$shortbegin/$end"
done
shortenedpath="${shortenedpath%/}" # strip trailing /
shortenedpath="${shortenedpath#/}" # strip leading /
if [ $INHOME -eq 1 ]; then
echo "~/$shortenedpath" #make sure it starts with ~/
else
echo "/$shortenedpath" # Make sure it starts with /
fi
shopt "$NGV" nullglob # Reset nullglob in case this is being used as a function.
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