weather: add support for dew point

Signed-off-by: Jonathan McCrohan <jmccrohan@gmail.com>
Signed-off-by: Adrian C. (anrxc) <anrxc@sysphere.org>

README

@@ -282,7 +282,8 @@ vicious.widgets.weather
   - provides weather information for a requested station
   - takes the ICAO station code as an argument, i.e. "LDRI"
   - returns a table with string keys: {city}, {wind}, {windmph},
-    {windkmh}, {sky}, {weather}, {tempf}, {tempc}, {humid}, {press}
+    {windkmh}, {sky}, {weather}, {tempf}, {tempc}, {humid}, {dewf},
+    {dewc}, {press}
 
 vicious.widgets.date
   - provides access to os.date, with optional time formatting provided

widgets/weather.lua

@@ -28,6 +28,8 @@ local _weather = {
     ["{weather}"] = "N/A",
     ["{tempf}"]   = "N/A",
     ["{tempc}"]   = "N/A",
+    ["{dewf}"]    = "N/A",
+    ["{dewc}"]    = "N/A",
     ["{humid}"]   = "N/A",
     ["{press}"]   = "N/A"
 }
@@ -58,6 +60,8 @@ local function worker(format, warg)
        string.match(ws, "Weather:[%s](.-)[%c]") or _weather["{weather}"]
     _weather["{tempf}"]   = -- Temperature in fahrenheit
        string.match(ws, "Temperature:[%s]([%-]?[%d%.]+).*[%c]") or _weather["{tempf}"]
+    _weather["{dewf}"]    = -- Dew Point in fahrenheit
+       string.match(ws, "Dew[%s]Point:[%s]([%-]?[%d%.]+).*[%c]") or _weather["{dewf}"]
     _weather["{humid}"]   = -- Relative humidity in percent
        string.match(ws, "Relative[%s]Humidity:[%s]([%d]+)%%") or _weather["{humid}"]
     _weather["{press}"]   = -- Pressure in hPa
@@ -71,6 +75,10 @@ local function worker(format, warg)
     if _weather["{tempf}"] ~= "N/A" then
        _weather["{tempf}"] = tonumber(_weather["{tempf}"])
        _weather["{tempc}"] = math.ceil((_weather["{tempf}"] - 32) * 5/9)
+    end -- Dew Point in °C if °F was available
+    if _weather["{dewf}"] ~= "N/A" then
+       _weather["{dewf}"] = tonumber(_weather["{dewf}"])
+       _weather["{dewc}"] = math.ceil((_weather["{dewf}"] - 32) * 5/9)
     end -- Capitalize some stats so they don't look so out of place
     if _weather["{sky}"] ~= "N/A" then
        _weather["{sky}"] = helpers.capitalize(_weather["{sky}"])