1 files changed, 54 insertions, 0 deletions
diff --git a/bash-scripts/pwd-prompt.bash b/bash-scripts/pwd-prompt.bash
new file mode 100755
index 0000000..a3fce41
--- /dev/null
+++ b/bash-scripts/pwd-prompt.bash
@@ -0,0 +1,54 @@
+#!/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.