Add argument parsing.

src/randopics.nim

@@ -1,15 +1,28 @@
-import httpClient, json
+import httpClient, json, os, options, strformat
 import gintro/[gtk, glib, gobject, gio, gdkpixbuf]
+import argparse except run
+
+const
+  version = "0.1"
+  floofUrl = "https://randomfox.ca/floof/"
+
+type
+  Mode {.pure.} = enum
+    Foxes = "foxes"     ## Some nice foxes
+    Inspiro = "inspiro" ## Inspiring nonsense 
 
 var
   client = newHttpClient()
   window: ApplicationWindow
+  imageWidget: Image
   fullscreen = true
+  mode: Option[Mode]
+  argParser = newParser("randopix"):
+    help(fmt"Version {version} - Display random images from different sources")
+    option("-m", "--mode", help="One of these: foxes, inspiro, inspiro-xmas")
+    flag("-w", "--windowed", help="Do not start in fullscreen mode")
 
-const 
-  floofUrl = "https://randomfox.ca/floof/"
-
-proc downloadImage(): Pixbuf =
+proc downloadFox(): Pixbuf =
   let urlData = client.getContent(floofUrl)
   let info = parseJson(urlData)
   let imageData = client.getContent(info["image"].getStr)
@@ -30,10 +43,19 @@ proc resizeImage(pixbuf: Pixbuf): Pixbuf =
 
   pixbuf.scaleSimple(width, height, InterpType.bilinear)
 
-proc updateImage(action: SimpleAction; parameter: Variant; widget: Image) =
-  var pixbuf = downloadImage()
-  pixbuf = pixbuf.resizeImage()
-  widget.setFromPixbuf(pixbuf)
+proc getImage(): Option[Pixbuf] = 
+  if mode.isSome:
+    case mode.get
+    of Mode.Foxes:
+      result = some(downloadFox())
+    of Mode.Inspiro:
+      echo "Not Implemented"
+
+proc updateImage(action: SimpleAction; parameter: Variant;) =
+  let data = getImage();
+  if (data.isNone): return
+  var pixbuf = data.get().resizeImage()
+  imageWidget.setFromPixbuf(pixbuf)
 
 proc toggleFullscreen(action: SimpleAction; parameter: Variant; window: ApplicationWindow) =
   if fullscreen:
@@ -44,23 +66,16 @@ proc toggleFullscreen(action: SimpleAction; parameter: Variant; window: Applicat
 
 proc quit(action: SimpleAction; parameter: Variant; app: Application) = 
     app.quit()
-  
-proc appActivate(app: Application) =
-  window = newApplicationWindow(app)
-  window.title = "Randopics"
-  window.setKeepAbove(true)
+
+proc applyStyle(window: Window) =
   let cssProvider = newCssProvider()
   let data = "window { background: black; }"
   discard cssProvider.loadFromData(data)
   let styleContext = window.getStyleContext()
   styleContext.addProvider(cssProvider, STYLE_PROVIDER_PRIORITY_USER)
-
-  let imageWidget = newImage()
-  window.add(imageWidget)
-
-  if fullscreen:
-    window.fullscreen
-
+  
+proc connectSignals(app: Application) =
+  ## Connect th GTK signals to the procs 
   let fullscreenAction = newSimpleAction("fullscreen")
   discard fullscreenAction.connect("activate", toggleFullscreen, window)
   app.setAccelsForAction("win.fullscreen", "F")
@@ -72,16 +87,45 @@ proc appActivate(app: Application) =
   window.actionMap.addAction(quitAction)
 
   let updateImageAction = newSimpleAction("update")
-  discard updateImageAction.connect("activate", updateImage, imageWidget)
+  discard updateImageAction.connect("activate", updateImage)
   app.setAccelsForAction("win.update", "U")
   window.actionMap.addAction(updateImageAction)
 
+proc parseArgs(): void =
+  ## Parse and apply options from the command line
+  let opts = argparser.parse(commandLineParams())
+  fullscreen = not opts.windowed
+  if (opts.mode != ""):
+    try:
+      mode = some(parseEnum[Mode](opts.mode))
+    except ValueError:
+      echo "Invaild image source: ", opts.mode
+
+proc appActivate(app: Application) =
+  parseArgs()
+  # No mode was given, exit and display the help text
+  if (mode.isNone):
+    echo argParser.help
+    return
+
+  window = newApplicationWindow(app)
+  window.title = "Randopics"
+  window.setKeepAbove(true)
+  window.setDefaultSize(600, 600)
+
+  # Custom styling for e.g. the background color
+  window.applyStyle
+
+  imageWidget = newImage()
+  window.add(imageWidget)
+  
+  if fullscreen:
+    window.fullscreen
+
+  app.connectSignals
   window.showAll
 
-proc main =
+when isMainModule:
   let app = newApplication("org.gtk.example")
   connect(app, "activate", appActivate)
-  discard run(app)
-
-when isMainModule:
-  main()
+  discard run(app)