Shareware Build Flags

* Build the app with -tags="shareware" to compile the free/shareware
  build of the game.
* `make build-free` compiles both binaries to the bin/ folder in
  shareware mode.
* The constant balance.FreeVersion is true in the shareware build and
  all functionality related to the Doodad Editor UI mode is disabled
  in this build mode.

Makefile

@@ -20,6 +20,13 @@ build:
 	go build $(LDFLAGS) -i -o bin/doodle cmd/doodle/main.go
 	go build $(LDFLAGS) -i -o bin/doodad cmd/doodad/main.go
 
+# `make build-free` to build the binary in free mode.
+.PHONY: build-free
+build-free:
+	gofmt -w .
+	go build $(LDFLAGS) -tags="shareware" -i -o bin/doodle cmd/doodle/main.go
+	go build $(LDFLAGS) -tags="shareware" -i -o bin/doodad cmd/doodad/main.go
+
 # `make mingw` to cross-compile a Windows binary with mingw.
 .PHONY: mingw
 mingw:

cmd/doodad/main.go

@@ -10,6 +10,7 @@ import (
 
 	"git.kirsle.net/apps/doodle/cmd/doodad/commands"
 	doodle "git.kirsle.net/apps/doodle/pkg"
+	"git.kirsle.net/apps/doodle/pkg/balance"
 	"github.com/urfave/cli"
 )
 
@@ -29,9 +30,16 @@ func main() {
 	app := cli.NewApp()
 	app.Name = "doodad"
 	app.Usage = "command line interface for Doodle"
-	app.Version = fmt.Sprintf("%s build %s. Built on %s",
+
+	var freeLabel string
+	if balance.FreeVersion {
+		freeLabel = " (shareware)"
+	}
+
+	app.Version = fmt.Sprintf("%s build %s%s. Built on %s",
 		doodle.Version,
 		Build,
+		freeLabel,
 		BuildDate,
 	)
 

cmd/doodle/main.go

@@ -34,9 +34,16 @@ func main() {
 	app := cli.NewApp()
 	app.Name = "doodle"
 	app.Usage = "command line interface for Doodle"
-	app.Version = fmt.Sprintf("%s build %s. Built on %s",
+
+	var freeLabel string
+	if balance.FreeVersion {
+		freeLabel = " (shareware)"
+	}
+
+	app.Version = fmt.Sprintf("%s build %s%s. Built on %s",
 		doodle.Version,
 		Build,
+		freeLabel,
 		BuildDate,
 	)
 

docs/Release Modes.md

@@ -0,0 +1,29 @@
+# Release Modes
+
+Verifying your release mode:
+
+```bash
+# Full release version
+$ doodle -version
+doodle version 0.0.7 build 52a2545. Built on 2019-04-19T17:16:19-07:00
+
+# Shareware version includes the word "(shareware)" after the build number.
+$ doodle -version
+doodle version 0.0.7 build 52a2545 (shareware). Built on 2019-04-19T17:16:19-07:00
+```
+
+## Shareware
+
+* `make build-free` to build the shareware binaries to the bin/ folder.
+
+The shareware (free) version of the game has the following restrictions:
+
+* No Doodad Editor Mode available.
+  * "New Doodad" button hidden from UI
+  * d.NewDoodad() function errors out
+  * The dev console `edit <file>` command won't edit a doodad.
+
+## Full Version
+
+The full release of the game has no restrictions and includes the Doodad Editor
+Mode.

pkg/balance/flag_free.go

@@ -0,0 +1,6 @@
+// +build shareware
+
+package balance
+
+// FreeVersion is true in the free version of the game.
+const FreeVersion = true

pkg/balance/flag_paid.go

@@ -0,0 +1,6 @@
+// +build !shareware
+
+package balance
+
+// FreeVersion is true in the free version of the game.
+const FreeVersion = false

pkg/commands.go

@@ -6,6 +6,7 @@ import (
 	"strconv"
 
 	"git.kirsle.net/apps/doodle/pkg/enum"
+	"github.com/robertkrimen/otto"
 )
 
 // Command is a parsed shell command.
@@ -60,7 +61,7 @@ func (c Command) Run(d *Doodle) error {
 		return nil
 	case "eval":
 	case "$":
-		out, err := d.shell.js.Run(c.ArgsLiteral)
+		out, err := c.RunScript(d, c.ArgsLiteral)
 		d.Flash("%+v", out)
 		return err
 	case "repl":
@@ -163,8 +164,7 @@ func (c Command) Edit(d *Doodle) error {
 
 	filename := c.Args[0]
 	d.shell.Write("Editing file: " + filename)
-	d.EditFile(filename)
-	return nil
+	return d.EditFile(filename)
 }
 
 // Play a map.
@@ -220,6 +220,17 @@ func (c Command) BoolProp(d *Doodle) error {
 	return nil
 }
 
+// RunScript evaluates some JavaScript code safely.
+func (c Command) RunScript(d *Doodle, code interface{}) (otto.Value, error) {
+	defer func() {
+		if err := recover(); err != nil {
+			d.Flash("Panic: %s", err)
+		}
+	}()
+	out, err := d.shell.js.Run(code)
+	return out, err
+}
+
 // Default command.
 func (c Command) Default() error {
 	return fmt.Errorf("%s: command not found. Try `help` for help",

pkg/config.go

@@ -48,7 +48,5 @@ func (d *Doodle) EditFile(filename string) error {
 		}
 	}
 
-	d.EditDrawing(absPath)
-
-	return nil
+	return d.EditDrawing(absPath)
 }

pkg/doodle.go

@@ -186,6 +186,11 @@ func (d *Doodle) NewMap() {
 
 // NewDoodad loads a new Doodad in Edit Mode.
 func (d *Doodle) NewDoodad(size int) {
+	if balance.FreeVersion {
+		d.Flash("Doodad editor is not available in your version of the game.")
+		return
+	}
+
 	log.Info("Starting a new doodad")
 	scene := &EditorScene{
 		DrawingType: enum.DoodadDrawing,
@@ -214,6 +219,9 @@ func (d *Doodle) EditDrawing(filename string) error {
 		log.Info("is a Level type")
 		scene.DrawingType = enum.LevelDrawing
 	case "doodad":
+		if balance.FreeVersion {
+			return fmt.Errorf("Doodad editor not supported in your version of the game")
+		}
 		scene.DrawingType = enum.DoodadDrawing
 	default:
 		return fmt.Errorf("file extension '%s' doesn't indicate its drawing type", ext)

pkg/editor_ui.go

@@ -399,7 +399,7 @@ func (u *EditorUI) SetupMenuBar(d *Doodle) *ui.Frame {
 				d.Prompt("Open filename>", func(answer string) {
 					if answer != "" {
 						if err := d.EditFile(answer); err != nil {
-							d.Flash("File not found: %s", answer)
+							d.Flash(err.Error())
 						}
 					}
 				})
@@ -408,6 +408,12 @@ func (u *EditorUI) SetupMenuBar(d *Doodle) *ui.Frame {
 	}
 
 	for _, btn := range buttons {
+		if balance.FreeVersion {
+			if btn.Text == "New Doodad" {
+				continue
+			}
+		}
+
 		w := ui.NewButton(btn.Text, ui.NewLabel(ui.Label{
 			Text: btn.Text,
 			Font: balance.MenuFont,