Improve weather and corona daemons

They now remove the temp_file when the output of the command is not
valid in order to force an update the next time a check is made.

config/awesome/evil/coronavirus.lua

@@ -10,6 +10,7 @@ local naughty = require("naughty")
 
 local update_interval = 60 * 60 * 12 -- 12 hours
 local country = user.coronavirus_country or "usa"
+local temp_file = "/tmp/awesomewm-evil-coronavirus"
 
 local coronavirus_script = [[
   sh -c '
@@ -25,11 +26,18 @@ local coronavirus_script = [[
   echo CTOTAL@$cases_total@CTODAY@$cases_today@DTOTAL@$deaths_total@DTODAY@$deaths_today@
   ']]
 
-helpers.remote_watch(coronavirus_script, update_interval, "/tmp/awesomewm-evil-coronavirus", function(stdout)
+helpers.remote_watch(coronavirus_script, update_interval, temp_file, function(stdout)
     local cases_total = stdout:match('^CTOTAL@(.*)@CTODAY')
     local cases_today = stdout:match('CTODAY@(.*)@DTOTAL')
     local deaths_total = stdout:match('DTOTAL@(.*)@DTODAY')
     local deaths_today = stdout:match('DTODAY@(.*)@')
 
-    awesome.emit_signal("evil::coronavirus", cases_total, cases_today, deaths_total, deaths_today)
+    -- If it is found, we assume the command succeeded
+    if cases_total then
+        awesome.emit_signal("evil::coronavirus", cases_total, cases_today, deaths_total, deaths_today)
+    else
+        -- Remove temp_file to force an update the next time
+        awful.spawn.with_shell("rm "..temp_file)
+        awesome.emit_signal("evil::coronavirus", -1, -1, -1, -1)
+    end
 end)

config/awesome/evil/weather.lua

@@ -12,6 +12,7 @@ local city_id = user.openweathermap_city_id
 local units = user.weather_units
 -- Don't update too often, because your requests might get blocked for 24 hours
 local update_interval = 1200
+local temp_file = "/tmp/awesomewm-evil-weather"
 
 local weather_details_script = [[
     bash -c '
@@ -32,7 +33,7 @@ local weather_details_script = [[
     fi
   ']]
 
-helpers.remote_watch(weather_details_script, update_interval, "/tmp/awesomewm-evil-weather", function(stdout)
+helpers.remote_watch(weather_details_script, update_interval, temp_file, function(stdout)
     local icon_code = string.sub(stdout, 1, 3)
     local weather_details = string.sub(stdout, 5)
     weather_details = string.gsub(weather_details, '^%s*(.-)%s*$', '%1')
@@ -43,6 +44,8 @@ helpers.remote_watch(weather_details_script, update_interval, "/tmp/awesomewm-ev
     local description = weather_details:match('(.*)@@')
     local temperature = weather_details:match('@@(.*)')
     if icon_code == "..." then
+        -- Remove temp_file to force an update the next time
+        awful.spawn.with_shell("rm "..temp_file)
         awesome.emit_signal("evil::weather", 999, "Weather unavailable", "")
     else
         awesome.emit_signal("evil::weather", tonumber(temperature), description, icon_code)

config/awesome/rc.lua

@@ -130,7 +130,7 @@ user = {
     -- >> Coronavirus <<
     -- Country to check for corona statistics
     -- Uses the https://corona-stats.online API
-    coronavirus_country = "usa",
+    coronavirus_country = "germany",
 }
 -- ===================================================================