[Emacs] Fix post-commit hook

dotfiles/emacs.d/bin/git-hooks/post-commit

@@ -1,6 +1,13 @@
 #!/usr/bin/env bash
 
-THIS_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+SOURCE="${BASH_SOURCE[0]}"
+while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
+  DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+  SOURCE="$(readlink "$SOURCE")"
+  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+done
+THIS_DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+
 source "$THIS_DIR/../util.sh"
 
 if readme_was_updated; then