Improvements for the location plugin

- use an api_key if one is configured
- send the location by using the api
- provide same pin color as standard map
- send overview map based on the type of the location scale
- remove the temporary file after download

plugins/location.lua

@@ -1,3 +1,14 @@
+-- Implement a command !loc [area] which uses
+-- the static map API to get a location image
+
+-- Not sure if this is the proper way
+-- Intent: get_latlong is in time.lua, we need it here
+-- loadfile "time.lua"
+
+-- Globals
+-- If you have a google api key for the geocoding/timezone api
+api_key = config.google_api_key or nil
+base_api = "https://maps.googleapis.com/maps/api"
 
 function delay_s(delay)
    delay = delay or 1
@@ -5,25 +16,52 @@ function delay_s(delay)
    while os.time() < time_to do end
 end
 
-function run(msg, matches)
-  local loc = string.gsub(matches[1], "%s+", "+")
-  local receiver = get_receiver(msg)
+function get_staticmap(area)
+   local api        = base_api .. "/staticmap?"
 
-  local zooms = {16, 18}
+   -- Get a sense of scale
+   lat,lng,acc,types = get_latlong(area)
    
-  for i = 1, #zooms do
-    local zoom = zooms[i]
-    local url = "http://maps.googleapis.com/maps/api/staticmap?zoom=" .. zoom .. "&size=600x300&maptype=roadmap&center=" .. loc .. "&markers=color:blue%7Clabel:A%7C" .. loc
-    local file = download_to_file(url)
-    send_photo(receiver, file, ok_cb, false)
-    delay_s(2)
+   local scale=types[1]
+   if     scale=="locality" then zoom=8
+   elseif scale=="country"  then zoom=4
+   else zoom=13 end
+      
+   local parameters =
+      "size=600x300" ..
+      "&zoom="  .. zoom ..
+      "&center=" .. URL.escape(area) ..
+      "&markers=color:red"..URL.escape("|"..area)
+   
+   if api_key ~=nil and api_key ~= "" then
+      parameters = parameters .. "&key="..api_key
    end
+   return lat, lng, api..parameters
+end
 
-  return "www.google.es/maps/place/" .. loc
+
+function run(msg, matches)
+   local receiver	= get_receiver(msg)
+   local lat,lng,url	= get_staticmap(matches[1])
+   
+   local file_path      = download_to_file(url)
+
+   -- Send the actual location, is a google maps link
+   send_location(receiver, lat, lng, ok_cb, false)
+  
+   -- Send a picture of the map, which takes scale into account
+   send_photo(receiver, file_path, ok_cb, false)
+   delay_s(2)
+   
+    -- Clean up after some time
+   postpone(rmtmp_cb, file_path, 20.0)
+
+   -- Return a link to the google maps stuff is now not needed anymore
+   return nil
 end
 
 return {
-    description = "generates a map showing the given location", 
+    description = "Gets information about a location, maplink and overview", 
     usage = "!loc (location)",
     patterns = {"^!loc (.*)$"}, 
     run = run 

plugins/time.lua

@@ -36,7 +36,8 @@ function get_latlong(area)
       lat  = data.results[1].geometry.location.lat
       lng  = data.results[1].geometry.location.lng
       acc  = data.results[1].geometry.location_type
-      return lat,lng,acc
+      types= data.results[1].types
+      return lat,lng,acc,types
    end
 end