Allow installer to work directly without saving

installer.sh

@@ -1,6 +1,11 @@
 #!/usr/bin/env bash
-set -e
 
+shopt -s extglob
+set -o errtrace
+set -o errexit
+set -o pipefail
+
+install() {
   BINARY_NAME="crib"
   VERSION="v0.0.1-alpha"
 
@@ -56,15 +61,15 @@ echo "Installing Crib (Ruby $RUBY_VERSION)"
   echo "Install locally ~/.local/bin or globally /usr/bin? [l/g]"
   read -r choice
   case "$choice" in
-(l | L)
+  l | L)
     INSTALL_DIR="$HOME/.local/bin"
     SUDO=""
     ;;
-(g | G)
+  g | G)
     INSTALL_DIR="/usr/bin"
     SUDO="sudo"
     ;;
-(*)
+  *)
     echo "Invalid choice"
     exit 1
     ;;
@@ -82,3 +87,6 @@ echo "✔ Crib installed to $INSTALL_DIR"
   echo "Run with: $BINARY_NAME"
   echo "Ruby ABI: $RUBY_VERSION"
   echo "Add $INSTALL_DIR to PATH if needed."
+}
+
+install "$@"