refactor: create service name base once (DRY)

tasks/main.yml

@@ -1,15 +1,19 @@
+- name: set service name base
+  set_fact:
+    touch_file_service_name_base: "touch-file-{{ file|replace('/', '-') }}"
+
 - name: create touch-file.service
   template:
     src=touch-file.service.j2
-    dest=/etc/systemd/system/touch-file-{{ file|replace('/', '-') }}.service
+    dest=/etc/systemd/system/{{ touch_file_service_name_base }}.service
   notify: systemd-daemon-reload
 
 - name: create touch-file.timer
   template:
     src=touch-file.timer.j2
-    dest=/etc/systemd/system/touch-file-{{ file|replace('/', '-') }}.timer
+    dest=/etc/systemd/system/{{ touch_file_service_name_base }}.timer
   notify: systemd-daemon-reload
 
 - name: enable touch-file.timer
   service:
-    name=touch-file-{{ file|replace('/', '-') }}.timer state=started enabled=yes
+    name={{ touch_file_service_name_base }}.timer state=started enabled=yes