added ~ replacement in shorten_path to bring it in-line with fish prompt

functions/shorten_path.fish

@@ -1,11 +1,13 @@
 function shorten_path
     # shorten_path is a script to compress a path without sacrificing to much readibility
     # It shortens each segment in a path to one character except the last
+    # It also replaces /home/user with ~ to save space
     # e.g.:
     # /path/to/somewhere        → /p/t/somewhere
     # some/relative/path        → s/r/path
     # singel_segment_path       → singel_segment_path
     # /path/with//empty/space   → /p/w//e/space
+    # /home/user/test/123       → ~/t/123
 
     # handle single segment paths (don't contain a slash)
     if ! string match -q -- '*/*' $argv[1]
@@ -13,8 +15,11 @@ function shorten_path
         return
     end
 
+    # replace /home/<username> with ~
+    set argv[1] (string replace -r "^$HOME" '~' "$argv[1]")
+
     # split
-    set -l segments (string split '/' (string trim -r -c '/' $argv[1]))
+    set -l segments (string split '/' (string trim -r -c '/' "$argv[1]"))
     
     # handle relative paths
     if test -n "$segments[1]"