Improve the deploy tool

tools/deploy.sh

@@ -13,23 +13,37 @@ set -eu
 PAGES_BRANCH="gh-pages"
 
 _no_branch=false
+_backup_dir="$(mktemp -d)"
 
+init() {
   if [[ -z $(git branch -av | grep "$PAGES_BRANCH") ]]; then
     _no_branch=true
     git checkout -b "$PAGES_BRANCH"
   else
     git checkout "$PAGES_BRANCH"
   fi
+}
 
-mv _site ../
-mv .git ../
+backup() {
+  mv _site "$_backup_dir"
+  mv .git "$_backup_dir"
 
+  # When adding custom domain from Github website, 
+  # the CANME only exist on `gh-pages` branch
+  if [[ -f CNAME ]]; then 
+    mv CNAME "$_backup_dir"
+  fi  
+}
+
+flush() {
   rm -rf ./*
   rm -rf .[^.] .??*
 
-mv ../_site/* .
-mv ../.git .
+  shopt -s dotglob nullglob
+  mv "$_backup_dir"/* .
+}
 
+deoply() {
   git config --global user.name "GitHub Actions"
   git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
 
@@ -38,7 +52,17 @@ git add -A
   git commit -m "[Automation] Site update No.${GITHUB_RUN_NUMBER}"
 
   if [[ $_no_branch = true ]]; then
-  git push -u origin $PAGES_BRANCH
+    git push -u origin "$PAGES_BRANCH"
   else
     git push -f
   fi
+}
+
+main() {
+  init
+  backup
+  flush
+  deoply
+}
+
+main