refactor: rename command to :set-property

This will allow us to set other property values for the buildpacks plugin.

plugins/buildpacks/src/commands/commands.go

@@ -24,7 +24,7 @@ Additional commands:`
     buildpacks:remove <app> <buildpack>, Remove a buildpack set on the app
     buildpacks:report [<app>] [<flag>], Displays a buildpack report for one or more apps
     buildpacks:set [--index 1] <app> <buildpack>, Set new app buildpack at a given position defaulting to the first buildpack if no index is specified
-    buildpacks:stack-set <app> <stack>, Sets the stack of an app
+    buildpacks:set-property [--global|<app>] <key> <value>, Set or clear a buildpacks property for an app
 `
 )
 

plugins/buildpacks/src/subcommands/subcommands.go

@@ -57,17 +57,19 @@ func main() {
 		appName := args.Arg(0)
 		buildpack := args.Arg(1)
 		err = buildpacks.CommandSet(appName, buildpack, *index)
-	case "stack-set":
-		args := flag.NewFlagSet("buildpacks:stack-set", flag.ExitOnError)
+	case "set-property":
+		args := flag.NewFlagSet("buildpacks:set-property", flag.ExitOnError)
 		global := args.Bool("global", false, "--global: set a global property")
 		args.Parse(os.Args[2:])
 		appName := args.Arg(0)
-		stack := args.Arg(1)
+		property := args.Arg(1)
+		value := args.Arg(2)
 		if *global {
 			appName = "--global"
-			stack = args.Arg(0)
+			property = args.Arg(0)
+			value = args.Arg(1)
 		}
-		err = buildpacks.CommandStackSet(appName, stack)
+		err = buildpacks.CommandSetProperty(appName, property, value)
 	default:
 		common.LogFail(fmt.Sprintf("Invalid plugin subcommand call: %s", subcommand))
 	}