From aed5fe466c390c1d5a0a597730fc89328526d3ce Mon Sep 17 00:00:00 2001
From: Jan Kaluza <jkaluza@redhat.com>
Date: Apr 22 2020 17:41:10 +0000
Subject: Add ./preview.sh --refresh to automatically rebuild documentation on its source change.


---

diff --git a/README.md b/README.md
index 1a18986..b8d81ee 100644
--- a/README.md
+++ b/README.md
@@ -59,3 +59,6 @@ $ ./preview.sh
 ```
 
 The result will be available at http://localhost:8080
+
+When using Linux, it is also possible to pass `--refresh` argument to automatically
+rebuild the documentation on source change.
diff --git a/preview.sh b/preview.sh
index f8c48c2..3dd200a 100755
--- a/preview.sh
+++ b/preview.sh
@@ -13,7 +13,27 @@ elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
     echo ""
     echo "The preview is available at http://localhost:8080"
     echo ""
-    pushd ./public
-    python3 -m http.server 8080
-    popd
+
+    if [[ "$*" == *--refresh* ]]; then
+        if ! [ -x "$(command -v inotifywait)" ]; then
+            echo 'Error: inofitywait (inotify-utils) is not installed.' >&2
+            exit 1
+        fi
+
+        # Setup trap to kill this process group on ctrl+c.
+        killgroup(){
+            kill 0
+        }
+        trap killgroup SIGINT
+
+        # Run the Python's webserver.
+        python3 -m http.server 8080 --directory ./public &
+
+        while inotifywait -r ./modules -e create -e moved_to -e modify; do
+             echo "Documentation source changed, rebuilding ..."
+            ./build.sh
+        done
+    else
+        python3 -m http.server 8080 --directory ./public
+    fi
 fi