fix live update bug

html-gen.sh

@@ -288,6 +288,7 @@ replace_foreach () {
 }
 
 generate_article() {
+  temp=`mktemp fugitiveXXXXXX`
   art="${1#$articles_dir/}"
   title=`get_article_title "$art"`
   cat "$templates_dir/article.html" | \
@@ -296,7 +297,8 @@ generate_article() {
     replace_str "blog_url" "$blog_url" | \
     replace_commit_info "-1" | \
     replace_article_info "$art" | \
-    sed "/^[[:space:]]*$/d" > "$public_dir/$art.html"
+    sed "/^[[:space:]]*$/d" > "$temp"
+  mv "$temp" "$public_dir/$art.html"
 }
 
 regenerate_previous_and_next_article_maybe() {