Command-line flag for window resolution

* Added a --window flag to the game executable to specify the startup
  window resolution. Either specify an exact size (e.g. 1024x768) or a
  special keyword "desktop", "mobile" or "landscape"
* Default size is "desktop" or 1024x768
* Mobile simulates a smartphone form factor of 375x812
* Landscape is mobile but flipped horizontally.
* Doodle UX isn't great on mobile but this is a step towards working on
  mobile friendly UI

cmd/doodle/main.go

@@ -1,11 +1,14 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"log"
 	"os"
+	"regexp"
 	"runtime"
 	"sort"
+	"strconv"
 	"time"
 
 	doodle "git.kirsle.net/apps/doodle/pkg"
@@ -65,6 +68,11 @@ func main() {
 			Aliases: []string{"e"},
 			Usage:   "edit the map given on the command line (instead of play it)",
 		},
+		&cli.StringFlag{
+			Name:    "window",
+			Aliases: []string{"w"},
+			Usage:   "set the window size (e.g. -w 1024x768) or special value: desktop, mobile, landscape",
+		},
 		&cli.BoolFlag{
 			Name:  "guitest",
 			Usage: "enter the GUI Test scene on startup",
@@ -77,6 +85,13 @@ func main() {
 			filename = c.Args().Get(0)
 		}
 
+		// Setting a custom resolution?
+		if c.String("window") != "" {
+			if err := setResolution(c.String("window")); err != nil {
+				panic(err)
+			}
+		}
+
 		// SDL engine.
 		engine := sdl.New(
 			fmt.Sprintf("%s v%s", branding.AppName, branding.Version),
@@ -124,3 +139,29 @@ func main() {
 		log.Fatal(err)
 	}
 }
+
+func setResolution(value string) error {
+	switch value {
+	case "desktop":
+		return nil
+	case "mobile":
+		balance.Width = 375
+		balance.Height = 812
+	case "landscape":
+		balance.Width = 812
+		balance.Height = 375
+	default:
+		var re = regexp.MustCompile(`^(\d+?)x(\d+?)$`)
+		m := re.FindStringSubmatch(value)
+		if len(m) == 0 {
+			return errors.New("--window: must be of the form WIDTHxHEIGHT, i.e. " +
+				"1024x768, or special keywords desktop, mobile, or landscape.")
+		}
+
+		w, _ := strconv.Atoi(m[1])
+		h, _ := strconv.Atoi(m[2])
+		balance.Width = w
+		balance.Height = h
+	}
+	return nil
+}

etc/linux/net.kirsle.ProjectDoodle.desktop

@@ -6,6 +6,7 @@ GenericName=Project Doodle
 X-GNOME-FullName=Project: Doodle - A drawing-based maze game
 Comment=A drawing-based maze game.
 Exec=/opt/project-doodle/doodle
+Path=/opt/project-doodle
 Icon=project-doodle
 StartupNotify=true
 Keywords=game;maze;

scripts/fpm-bundle.sh

@@ -37,6 +37,9 @@ cp ../../etc/icons/64.png "root$ICON_ROOT/64x64/apps/project-doodle.png"
 cp ../../etc/icons/32.png "root$ICON_ROOT/32x32/apps/project-doodle.png"
 cp ../../etc/icons/16.png "root$ICON_ROOT/16x16/apps/project-doodle.png"
 
+# Copy runtime package and guidebook
+cp -r guidebook rtp "root$INSTALL_ROOT/"
+
 echo =====================
 echo Starting fpm package build.
 echo =====================