Fix rubocop in vscode and simplify brew install-bundler-gems calls

.vscode/ruby-lsp-activate.sh

@@ -8,7 +8,14 @@ else
 fi
 HOMEBREW_PREFIX="$(cd "$(dirname "${SCRIPT_PATH}")"/../ && pwd)"
 
-"${HOMEBREW_PREFIX}/bin/brew" install-bundler-gems --add-groups=style,typecheck,vscode >/dev/null 2>&1
-
-export PATH="${HOMEBREW_PREFIX}/Library/Homebrew/vendor/portable-ruby/current/bin:${PATH}"
+# These are used by the functions needed from utils/ruby.sh
+export HOMEBREW_BREW_FILE="${HOMEBREW_PREFIX}/bin/brew"
+export HOMEBREW_LIBRARY="${HOMEBREW_PREFIX}/Library"
 export BUNDLE_WITH="style:typecheck:vscode"
+
+# shellcheck disable=SC1091
+source "${HOMEBREW_PREFIX}/Library/Homebrew/utils/ruby.sh"
+
+setup-ruby-path
+setup-gem-home-bundle-gemfile
+ensure-bundle-dependencies

Library/Homebrew/cmd/setup-ruby.sh

@@ -34,8 +34,5 @@ homebrew-setup-ruby() {
 
   setup-gem-home-bundle-gemfile
 
-  if ! bundle check &>/dev/null
-  then
-    "${HOMEBREW_BREW_FILE}" install-bundler-gems
-  fi
+  ensure-bundle-dependencies
 }

Library/Homebrew/dev-cmd/rubocop.sh

@@ -12,10 +12,7 @@ homebrew-rubocop() {
   BUNDLE_WITH="style"
   export BUNDLE_WITH
 
-  if ! bundle check &>/dev/null
-  then
-    "${HOMEBREW_BREW_FILE}" install-bundler-gems --add-groups="${BUNDLE_WITH}"
-  fi
+  ensure-bundle-dependencies
 
   export PATH="${GEM_HOME}/bin:${PATH}"
 

Library/Homebrew/utils/ruby.sh

@@ -187,3 +187,18 @@ setup-gem-home-bundle-gemfile() {
   export GEM_HOME
   export BUNDLE_GEMFILE
 }
+
+ensure-bundle-dependencies() {
+  local install_args=()
+
+  if ! bundle check &>/dev/null
+  then
+    if [[ -n "${BUNDLE_WITH}" ]]
+    then
+      # Convert colon-separated BUNDLE_WITH to comma-separated for --add-groups
+      local groups_for_flag="${BUNDLE_WITH//:/,}"
+      install_args+=("--add-groups=${groups_for_flag}")
+    fi
+    "${HOMEBREW_BREW_FILE}" install-bundler-gems "${install_args[@]}"
+  fi
+}