render.gno

 1package pingpong
 2
 3import (
 4	"chain/runtime/unsafe"
 5	"strconv"
 6	"strings"
 7)
 8
 9const pageSize = 50
10
11// Render serves "" (the first page), "page/N" and "game/<id>".
12func Render(path string) string {
13	switch {
14	case path == "":
15		return renderPage(1)
16	case strings.HasPrefix(path, "page/"):
17		n, err := strconv.Atoi(strings.TrimPrefix(path, "page/"))
18		if err != nil || n < 1 {
19			return "Not found."
20		}
21		return renderPage(n)
22	case strings.HasPrefix(path, "game/"):
23		id := strings.TrimPrefix(path, "game/")
24		if !games.Has(id) {
25			return "Not found."
26		}
27		return renderGame(games.Get(id).(*Game))
28	}
29	return "Not found."
30}
31
32// renderPage lists the games newest first, pageSize to a page.
33func renderPage(n int) string {
34	var b strings.Builder
35	b.WriteString("# pingpong\n\n")
36	pages := (games.Size() + pageSize - 1) / pageSize
37	if n > pages {
38		b.WriteString("No games on this page.\n")
39		return b.String()
40	}
41	games.ReverseIterateByOffset((n-1)*pageSize, pageSize, func(_ string, v any) bool {
42		g := v.(*Game)
43		b.WriteString("- [**" + g.ID + "**](" + selfPath + ":game/" + g.ID + ") " +
44			g.First.String() + " vs " + g.Second.String() + " · " + status(g) + "\n")
45		return false
46	})
47	if n < pages {
48		b.WriteString("\n[Next page](" + selfPath + ":page/" + strconv.Itoa(n+1) + ")\n")
49	}
50	return b.String()
51}
52
53func renderGame(g *Game) string {
54	var b strings.Builder
55	b.WriteString("# Game " + g.ID + "\n\n")
56	b.WriteString("- First: " + g.First.String() + "\n")
57	b.WriteString("- Second: " + g.Second.String() + "\n")
58	b.WriteString("- Status: " + status(g) + "\n")
59	if g.Started {
60		b.WriteString("- Turn: " + strconv.Itoa(g.Turn) + "\n")
61		b.WriteString("- Next: " + g.Next.String() + "\n")
62	}
63	b.WriteString("\n[All games](" + selfPath + ")\n")
64	return b.String()
65}
66
67func status(g *Game) string {
68	if !g.Started {
69		return "pending"
70	}
71	return "started · turn " + strconv.Itoa(g.Turn) + " · next " + g.Next.String()
72}
73
74// selfPath is this realm's path on gnoweb. It is read at package init, where
75// the realm itself is current; Render is not crossing, so reading it there
76// would give the caller's path. It only builds links.
77var selfPath = strings.TrimPrefix(unsafe.CurrentRealm().PkgPath(), "gno.land")