add --install

Author: jcfr

runformat

@@ -4,20 +4,20 @@
 #
 # Usage:
 #   ./runformat                               # format using the configured Uncrustify
-#   ./runformat -install                      # download, build, and use Uncrustify locally
-#   ./runformat -install --install-dir /abs/path
+#   ./runformat --install                      # download, build, and use Uncrustify locally
+#   ./runformat --install --install-dir /abs/path
 #   ./runformat --expected-uncrustify-version # print ONLY the expected Uncrustify version
 #
 # You may also set:
 #   UNCRUSTIFY=/abs/path/to/uncrustify          # use a specific binary
-#   UNCRUSTIFY_INSTALL_DIR=/abs/path            # where `-install` will install
+#   UNCRUSTIFY_INSTALL_DIR=/abs/path            # where `--install` will install
 #
 # Requirements:
 #   - All developers must use the *exact* same Uncrustify version to avoid format churn.
 #   - Either:
 #       * Have `uncrustify` in PATH, or
 #       * Set env var UNCRUSTIFY=/absolute/path/to/uncrustify, or
-#       * Run `./runformat -install` to fetch & build the pinned version locally.
+#       * Run `./runformat --install` to fetch & build the pinned version locally.
 #
 # Notes:
 #   - The local install lives under: ./.runformat-uncrustify/uncrustify-<version>-install
@@ -99,13 +99,13 @@ print_expected_uncrustify_version_and_exit() {
 # --------------------------
 DO_INSTALL=0
 PRINT_EXPECTED_UNCRUSTIFY_VERSION=0
-# Accept: -install, --install-dir <dir>, -h/--help
+# Accept: --install, --install-dir <dir>, -h/--help
 while [[ $# -gt 0 ]]; do
   case "$1" in
     -h|--help)
       print_usage_and_exit
       ;;
-    -install)
+    --install)
       DO_INSTALL=1
       shift
       ;;
@@ -148,14 +148,14 @@ fi
 # Check Uncrustify availability
 if ! command -v "$UNCRUSTIFY" >/dev/null 2>&1; then
   err "Uncrustify executable not found: $UNCRUSTIFY"
-  die "Add it to PATH, set UNCRUSTIFY=/path/to/uncrustify, or run: $0 -install [--install-dir DIR]"
+  die "Add it to PATH, set UNCRUSTIFY=/path/to/uncrustify, or run: $0 --install [--install-dir DIR]"
 fi
 
 # Version check
 DETECTED_VERSION="$("$UNCRUSTIFY" --version 2>&1 | grep -oE '[0-9]+(\.[0-9]+)*' | head -n1 || true)"
 echo "Detected Uncrustify: ${DETECTED_VERSION:-unknown}"
 if [[ "$DETECTED_VERSION" != "${UNCRUSTIFY_VERSION}" ]]; then
-  die "Expected Uncrustify ${UNCRUSTIFY_VERSION}. Re-run with -install (and optionally --install-dir) or set UNCRUSTIFY."
+  die "Expected Uncrustify ${UNCRUSTIFY_VERSION}. Re-run with --install (and optionally --install-dir) or set UNCRUSTIFY."
 fi
 
 # Config check