enh: check bash-completion before install

Signed-off-by: wxiwnd <wxiwnd@outlook.com>

Author: wxiwnd

scripts/install_completion.sh

@@ -2,7 +2,25 @@
 set -e
 
 cargo build --release
-echo "Install binary..."
+
+# Check bash-completion
+if [ ! -d /etc/bash_completion.d ]; then
+    echo "Directory /etc/bash_completion.d does not exist. Please install bash-completion first."
+    exit 1
+fi
+
+# Install or upgrade the binary
+if [ -f /usr/bin/bash-pinyin-completion-rs ]; then
+    echo "The binary /usr/bin/bash-pinyin-completion-rs already exists. Upgrading..."
+else
+    echo "Installing binary..."
+fi
 sudo cp target/release/bash-pinyin-completion-rs /usr/bin/
-echo "Install bash-completion script..."
+
+# Install or upgrade the script
+if [ -f /etc/bash_completion.d/bash_pinyin_completion ]; then
+    echo "The bash-completion script /etc/bash_completion.d/bash_pinyin_completion already exists. Upgrading..."
+else
+    echo "Installing bash-completion script..."
+fi
 sudo cp scripts/bash_pinyin_completion /etc/bash_completion.d/