Added test to see if database present

Author: nickgammon

plugins/MUSHclient_Help.xml

@@ -10,7 +10,8 @@
    purpose="Shows the MUSHclient help file"
    save_state="y"
    date_written="2011-06-13 08:58:30"
-   requires="4.75"
+   date_modified="2011-07-14 08:40:00"
+   requires="4.76"
    version="1.0"
    >
 <description trim="y">
@@ -283,8 +284,11 @@ function general_help (search_string, want_snippet)
   
   AnsiNote (RESET)
   
-  assert (db, "No help database found")
-  
+  if not db then
+     ColourNote ("red", "", "MUSHclient help database 'help.db' not found.")
+     return
+  end -- if
+ 
   local count = 0
   local functions = {}
   local general = {}
@@ -409,6 +413,19 @@ function OnPluginInstall ()
     db = assert (sqlite3.open(GetInfo (66) .. "help.db"))
   end -- if
   
+  local commands = false
+  
+  -- see if commands table exists
+  for row in db:nrows("SELECT * FROM sqlite_master WHERE type = 'table' AND name = 'commands'") do 
+    commands = true
+  end
+  
+  if not commands then
+    ColourNote ("red", "", "MUSHclient help database 'help.db' not found.")
+    db:close ()
+    db = nil
+    return
+  end -- if
   
   local fts4 = false