Improve symclone's safety

Make sure files are not overwritten, and that symlinks would be reapplied
- allowing re-application of already existing links

symclone.sh

@@ -6,7 +6,15 @@ set -e
 SRC_DIR=_src.posix
 
 # Target directory (new structure with symlinks)
-DEST_DIR="${1:?}"
+DEST_DIR="${1}"
+
+is_cmd() {
+    type -p -- "${@}" 2> /dev/null 1> /dev/null
+}
+if is_cmd chezmoi && [ -z "$DEST_DIR" ]; then
+    DEST_DIR="$(chezmoi data | jq -r '.chezmoi.sourceDir | split("/") | last')"
+fi
+DEST_DIR="${DEST_DIR:?Must supply dest dir name}"
 
 # Check if both arguments are provided
 if [[ -z "$SRC_DIR" || -z "$DEST_DIR" ]]; then
@@ -52,7 +60,8 @@ find "$SRC_DIR" -type f | while read -r file; do
     src_relative_path=$(relpath "$file" "$(dirname "$DEST_DIR/$target_file")")
 
     # Create the symlink with relative path
-    ln -vs "$src_relative_path" "$DEST_DIR/$target_file"
+    [ -L "$DEST_DIR/$target_file" ] || ! [ -e "$DEST_DIR/$target_file" ] \
+    && ln ${FORCE} -vs "$src_relative_path" "$DEST_DIR/$target_file"
 done
 
 echo "Symbolic links created successfully in '$DEST_DIR'."