generated plot file will automatically open

README.md

@@ -16,3 +16,4 @@ This project makes use of the following dependencies (specified in `profun.cabal
 * bytestring (for ByteString type)
 * utf8-string (for conversion from String to ByteString)
 * time (for getting date)
+* process (for opening svg file)

app/Main.hs

@@ -17,6 +17,7 @@ main = do
     apiKey <- getWeatherKey
 
     generatePlot 20 35 25 --example
+    openPlot
 
     putStrLn "Enter a city name: "
     city <- getLine

app/Plot.hs

@@ -1,6 +1,7 @@
 module Plot where
 import Graphics.Rendering.Chart.Easy
 import Graphics.Rendering.Chart.Backend.Diagrams
+import System.Process (callCommand)
 
 
 formatData :: Double -> Double -> Double -> [(Int, Double)]
@@ -14,3 +15,10 @@ generatePlot yday tday tmrw = toFile def "plot/weather.svg" $ do
     layout_y_axis . laxis_generate .= scaledAxis def (-10, 40)
     layout_x_axis . laxis_generate .= autoIndexAxis ["Yesterday", "Today", "Tomorrow"]
     plot $ line "Degrees Celsius" [formatData yday tday tmrw]
+
+
+openPlot :: IO ()
+openPlot = callCommand "start plot/weather.svg"
+-- start plot/weather.svg     -- Windows
+-- xdg-open plot/weather.svg  -- Linux
+-- open plot/weather.svg      -- macOS

profun.cabal

@@ -74,7 +74,8 @@ executable profun
                       aeson ^>=2.2.2.0,
                       bytestring ^>=0.12.1.0,
                       utf8-string ^>=1.0.2,
-                      time ^>=1.12.2
+                      time ^>=1.12.2,
+                      process ^>=1.6.18.0
 
     -- Directories containing source files.
     hs-source-dirs:   app