Add pre-commit formatter

.githooks/pre-commit

@@ -1,10 +1,10 @@
 #!/bin/bash
 
-git diff --diff-filter=d --staged --name-only | grep -e '\(.*\).swift$' | while read line; do
-    swift-format format -i "${line}" --configuration swift-format-config.json;
-    git add "$line";
-done
-
-git diff --diff-filter=d --staged --name-only | grep -e '\(.*\).swift$' | while read line; do
-    swift-format lint -s "${line}" --configuration swift-format-config.json || exit 1;
-done
+swift-format --version 1>/dev/null 2>&1
+if [ $? -eq 0 ]; then
+    git diff --diff-filter=d --staged --name-only | grep -e '\(.*\).swift$' | while read line; do
+        echo "${line}"
+        swift-format -i "${line}"
+        git add "$line"
+    done
+fi