added PV delete functionality

SATES21-CPCL-DYNA/SATES21-CPCL-DYNA_fixed.template

@@ -8,3 +8,9 @@ record(stringin, "$(SYSTEM):NEW") {
     field(SCAN, "Passive")
 }
 
+record(stringin, "$(SYSTEM):DEL") {
+    field(DESC, "Delete")
+    field(VAL, "")
+    field(SCAN, "Passive")
+}
+

SATES21-CPCL-DYNA/cfg/python/data.py

@@ -4,6 +4,7 @@ def load_data(fn):
         with open(fn) as f:
             data = f.read().split("\n")
             data = set(data)
+            data.discard("") #TODO
     except FileNotFoundError:
         data = set()
     return data

SATES21-CPCL-DYNA/cfg/python/pvs.py

@@ -18,9 +18,21 @@ def cb_new(value=None, **kwargs):
     mk_db(data, FN_DB_TMPL)
     log.info(f"data: {sorted(data)}")
 
+def cb_del(value=None, **kwargs):
+    log.info(f"del: value={repr(value)} {kwargs}")
+    if not value:
+        return
+    data = load_data(FN_ENTRIES)
+    data.discard(value)
+    save_data(data, FN_ENTRIES)
+    mk_db(data, FN_DB_TMPL)
+    log.info(f"data: {sorted(data)}")
+
 
 pv_new = PV("SATES21-DYNA:NEW")
 pv_new.add_callback(cb_new)
 
+pv_del = PV("SATES21-DYNA:DEL")
+pv_del.add_callback(cb_del)