sneak
525465a68b
The 0x7fffffff mask makes both int32 conversions provably safe, so G115 never fired; nolintlint flags the directives as unused.
139 lines
2.6 KiB
Go
139 lines
2.6 KiB
Go
// Command rogue is the Go port of Rogue 5.4.4: Exploring the Dungeons of
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// Doom. It is a faithful function-by-function port of the classic C game;
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// see ARCHITECTURE.md at the repository root.
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package main
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import (
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"flag"
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"fmt"
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"os"
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"os/signal"
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"os/user"
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"strconv"
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"syscall"
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"time"
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"git.eeqj.de/sneak/rgoue/game"
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"git.eeqj.de/sneak/rgoue/term"
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)
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func main() {
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os.Exit(run())
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}
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// run carries the real main so that deferred terminal restoration runs
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// before the process exits (os.Exit skips defers).
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func run() int {
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scores := flag.Bool("s", false, "print the scoreboard and exit")
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deathDemo := flag.Bool("d", false, "die a random death (demo)")
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flag.Parse()
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cfg := loadConfig()
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if *scores {
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game.NewGame(cfg).ShowScores()
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return 0
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}
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t, err := term.New()
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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return 1
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}
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defer t.Fini()
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cfg.Term = t
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var g *game.RogueGame
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if args := flag.Args(); len(args) == 1 && !*deathDemo {
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// restore a saved game
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g, err = game.Restore(args[0], cfg)
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if err != nil {
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t.Fini()
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fmt.Fprintln(os.Stderr, err)
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return 1
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}
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} else {
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g = game.NewGame(cfg)
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}
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if *deathDemo {
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g.DeathDemo()
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return 0
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}
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installAutosave(g, t)
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runErr := g.Run()
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if runErr != nil {
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t.Fini()
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fmt.Fprintln(os.Stderr, runErr)
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return 1
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}
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return 0
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}
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// loadConfig gathers the game configuration from the environment: home
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// directory, ROGUEOPTS, user name, wizard mode, and the dungeon seed
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// (main.c's startup).
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func loadConfig() game.Config {
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home, _ := os.UserHomeDir()
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name := ""
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u, userErr := user.Current()
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if userErr == nil {
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name = u.Username
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}
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wizard := os.Getenv("ROGUE_WIZARD") != ""
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return game.Config{
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Seed: chooseSeed(wizard),
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Name: name,
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RogueOpts: os.Getenv("ROGUEOPTS"),
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Home: home,
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ScorePath: home + "/.rogue.scores",
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Wizard: wizard,
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}
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}
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// installAutosave saves the game and exits on SIGHUP/SIGTERM (save.c
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// auto_save).
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func installAutosave(g *game.RogueGame, t *term.Tcell) {
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sig := make(chan os.Signal, 1)
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signal.Notify(sig, syscall.SIGHUP, syscall.SIGTERM)
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go func() {
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<-sig
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g.AutoSave()
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t.Fini()
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os.Exit(0)
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}()
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}
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// chooseSeed picks the dungeon number: SEED for reproducible dungeons
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// (wizard mode, as in the C game), else time+pid (main.c).
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func chooseSeed(wizard bool) int32 {
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if env := os.Getenv("SEED"); env != "" && wizard {
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n, err := strconv.ParseInt(env, 10, 32)
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if err == nil {
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return int32(n)
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}
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}
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// The C game computed `lowtime + getpid()` in int; the truncation to
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// 32 bits is the same wraparound the C int arithmetic performed.
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return int32(time.Now().Unix()&0x7fffffff) +
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int32(os.Getpid()&0x7fffffff)
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}
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