diff --git a/.github/workflows/pr-ci-merge-main.yml b/.github/workflows/pr-ci-merge-main.yml
index 3d6e38e5..c0e6c225 100644
--- a/.github/workflows/pr-ci-merge-main.yml
+++ b/.github/workflows/pr-ci-merge-main.yml
@@ -5,6 +5,9 @@ on:
     branches: [main]
     paths-ignore:
       - '**.md'
+      - '**.in'
+      - '**.cls'
+      - '**.sh'
       - 'docs/**'
       - 'LICENSE'
 
diff --git a/scripts/install-afmt.sh b/scripts/install-afmt.sh
new file mode 100644
index 00000000..cb968cf8
--- /dev/null
+++ b/scripts/install-afmt.sh
@@ -0,0 +1,135 @@
+#!/usr/bin/env bash
+#
+# Install script for 'afmt' CLI.
+# Usage: curl -sL https://example.com/install-afmt.sh | bash
+
+set -euo pipefail
+
+REPO="xixiaofinland/afmt"
+API_URL="https://api.github.com/repos/${REPO}/releases/latest"
+TMP_DIR="$(mktemp -d)"
+INSTALL_DIR="$HOME/.local/bin"
+BINARY_NAME="afmt"
+
+# ------------------------------------------------------------------------------
+# 1. OS + ARCH DETECTION
+# ------------------------------------------------------------------------------
+detect_os() {
+  case "$(uname -s)" in
+    Linux*)   echo "unknown-linux-musl" ;;
+    Darwin*)  echo "apple-darwin" ;;
+    *)        echo "unsupported" ;;
+  esac
+}
+
+detect_arch() {
+  case "$(uname -m)" in
+    x86_64)  echo "x86_64" ;;
+    amd64)   echo "x86_64" ;;  # handle "amd64" as x86_64
+    arm64)   echo "aarch64" ;; # handle "arm64" as aarch64
+    aarch64) echo "aarch64" ;;
+    *)       echo "unsupported" ;;
+  esac
+}
+
+# ------------------------------------------------------------------------------
+# 2. DEPENDENCY CHECK
+# ------------------------------------------------------------------------------
+check_dependencies() {
+  local deps=("curl" "tar")
+  for dep in "${deps[@]}"; do
+    if ! command -v "$dep" >/dev/null 2>&1; then
+      echo "Error: '$dep' is not installed. Please install it and retry."
+      exit 1
+    fi
+  done
+}
+
+# ------------------------------------------------------------------------------
+# 3. MAIN INSTALLATION LOGIC
+# ------------------------------------------------------------------------------
+main() {
+  echo "Detecting OS and architecture..."
+  local os_type arch_type
+  os_type="$(detect_os)"
+  arch_type="$(detect_arch)"
+
+  if [[ "$os_type" == "unsupported" || "$arch_type" == "unsupported" ]]; then
+    echo "Error: Unsupported OS or architecture."
+    echo "This installer supports Linux/macOS on x86_64/aarch64."
+    exit 1
+  fi
+
+  # Ensure install dir exists
+  mkdir -p "$INSTALL_DIR"
+
+  echo "OS detected: $os_type"
+  echo "Arch detected: $arch_type"
+  echo "Fetching latest release from GitHub ($REPO)..."
+  local release_data
+  release_data="$(curl -s "$API_URL")"
+
+  # Construct a pattern to match the relevant asset name
+  # e.g., "afmt-v0.4.0-x86_64-apple-darwin.tar.gz"
+  local pattern="${arch_type}-${os_type}"
+
+  echo "Looking for an asset matching pattern: $pattern"
+  # Extract the first matching browser_download_url from release data
+  local download_url
+  download_url="$(echo "$release_data" \
+    | grep -i "browser_download_url" \
+    | grep "$pattern" \
+    | cut -d '"' -f 4 \
+    | head -n 1)"
+
+  if [[ -z "$download_url" ]]; then
+    echo "Error: No matching asset found for $pattern."
+    exit 1
+  fi
+
+  echo "Downloading from: $download_url"
+  local filename
+  filename="$(basename "$download_url")"
+
+  # Download the asset
+  curl -sL "$download_url" -o "${TMP_DIR}/${filename}"
+
+  # Extract the tar.gz into TMP_DIR
+  echo "Extracting $filename..."
+  tar -xf "${TMP_DIR}/${filename}" -C "$TMP_DIR"
+
+  # Move the afmt binary into INSTALL_DIR
+  # (Assume the extracted file is named 'afmt'; adjust if needed)
+  if [[ -f "${TMP_DIR}/${BINARY_NAME}" ]]; then
+    mv "${TMP_DIR}/${BINARY_NAME}" "$INSTALL_DIR/"
+    chmod +x "${INSTALL_DIR}/${BINARY_NAME}"
+  else
+    echo "Error: Could not find the '$BINARY_NAME' executable in the archive."
+    exit 1
+  fi
+
+  # Clean up
+  rm -rf "$TMP_DIR"
+
+  echo "============================================================"
+  echo "afmt installed to: $INSTALL_DIR/$BINARY_NAME"
+  echo ""
+
+  # Suggest adding INSTALL_DIR to PATH if it isn't there
+  if [[ ":$PATH:" != *":$INSTALL_DIR:"* ]]; then
+    echo "Note: $INSTALL_DIR is not in your PATH."
+    echo "Add the following line to your shell profile (e.g. ~/.bashrc or ~/.zshrc):"
+    echo ""
+    echo "  export PATH=\"\$PATH:$INSTALL_DIR\""
+    echo ""
+    echo "Then, reload your shell or open a new terminal session."
+  fi
+
+  echo "Installation complete! Run 'afmt --help' to get started."
+}
+
+# ------------------------------------------------------------------------------
+# 4. RUN
+# ------------------------------------------------------------------------------
+check_dependencies
+main
diff --git a/tests/to-do/twice_format_issue2.in b/tests/to-do/twice_format_issue2.in
new file mode 100644
index 00000000..2e2fe726
--- /dev/null
+++ b/tests/to-do/twice_format_issue2.in
@@ -0,0 +1,12 @@
+// format twice result differ
+class TestClass {
+  {
+    if(true){
+
+    } else 
+    // comment 1
+    {
+
+    }
+  }
+}