refactor: make install noninteractive terminal friendly

install

@@ -47,36 +47,40 @@ ensure_cargo() {
 
   print_message warning "Rust (cargo) is required but not found."
   print_message info "You should review and approve the Rust installer before proceeding."
+  reply=""
   if [[ -t 0 ]]; then
     read -r -p "Install Rust using rustup now? (y/N) " reply
-    case "${reply}" in
-      y|Y)
-        if command -v curl >/dev/null 2>&1; then
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
-        elif command -v wget >/dev/null 2>&1; then
-          wget -qO- https://sh.rustup.rs | sh -s -- -y
-        else
-          print_message error "Missing required command: curl or wget"
-          print_message info "Install Rust manually from https://rustup.rs and retry."
-          exit 1
-        fi
-        # shellcheck source=/dev/null
-        if [[ -f "$HOME/.cargo/env" ]]; then
-          # shellcheck disable=SC1090
-          source "$HOME/.cargo/env"
-        fi
-      ;;
-      *)
-        print_message info "Install Rust manually from https://rustup.rs and retry."
-        exit 1
-      ;;
-    esac
+  elif [[ -r /dev/tty ]]; then
+    read -r -p "Install Rust using rustup now? (y/N) " reply </dev/tty
   else
     print_message error "Non-interactive shell: cannot prompt to install Rust."
     print_message info "Install Rust manually from https://rustup.rs and retry."
     exit 1
   fi
 
+  case "${reply}" in
+    y|Y)
+      if command -v curl >/dev/null 2>&1; then
+        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+      elif command -v wget >/dev/null 2>&1; then
+        wget -qO- https://sh.rustup.rs | sh -s -- -y
+      else
+        print_message error "Missing required command: curl or wget"
+        print_message info "Install Rust manually from https://rustup.rs and retry."
+        exit 1
+      fi
+      # shellcheck source=/dev/null
+      if [[ -f "$HOME/.cargo/env" ]]; then
+        # shellcheck disable=SC1090
+        source "$HOME/.cargo/env"
+      fi
+    ;;
+    *)
+      print_message info "Install Rust manually from https://rustup.rs and retry."
+      exit 1
+    ;;
+  esac
+
   if ! command -v cargo >/dev/null 2>&1; then
     print_message error "Cargo still not available after installation."
     print_message info "Open a new shell or run: source \"$HOME/.cargo/env\""