gno.land/r/moul/x/daily/linktree/v0⧉

1package linktree23import (4	"strconv"5	"strings"67	"chain"8	"chain/runtime/unsafe"910	"gno.land/p/nt/avl/v0"11)1213// link is a single labeled URL on a profile.14type link struct {15	Label string16	URL   string17}1819// profile is one address's personal links page.20type profile struct {21	Bio   string22	Links []link23}2425// profiles maps an address (string key) to its *profile.26// avl.Tree keeps iteration deterministic for Render.27var profiles avl.Tree2829// SetBio sets (or replaces) the calling address's bio.30func SetBio(cur realm, bio string) {31	addr := unsafe.PreviousRealm().Address()32	p := getOrCreate(addr.String())33	p.Bio = bio34	chain.Emit("BioSet", "addr", addr.String())35}3637// AddLink appends a labeled URL to the calling address's profile.38func AddLink(cur realm, label string, url string) {39	if label == "" {40		panic("label must not be empty")41	}42	if url == "" {43		panic("url must not be empty")44	}45	addr := unsafe.PreviousRealm().Address()46	p := getOrCreate(addr.String())47	p.Links = append(p.Links, link{Label: label, URL: url})48	chain.Emit("LinkAdded", "addr", addr.String(), "label", label)49}5051// RemoveLink deletes the link at index from the calling address's profile.52func RemoveLink(cur realm, index int) {53	addr := unsafe.PreviousRealm().Address()54	key := addr.String()55	v := profiles.Get(key)56	if v == nil {57		panic("no profile for caller")58	}59	p := v.(*profile)60	if index < 0 || index >= len(p.Links) {61		panic("index out of range")62	}63	p.Links = append(p.Links[:index], p.Links[index+1:]...)64	chain.Emit("LinkRemoved", "addr", key, "index", strconv.Itoa(index))65}6667// getOrCreate returns the profile for key, creating an empty one if absent.68func getOrCreate(key string) *profile {69	if v := profiles.Get(key); v != nil {70		return v.(*profile)71	}72	p := &profile{}73	profiles.Set(key, p)74	return p75}7677// Render shows all profiles at root, or a single profile at "/<address>".78func Render(path string) string {79	addr := strings.Trim(path, "/")80	if addr == "" {81		return renderIndex()82	}83	return renderProfile(addr)84}8586func renderIndex() string {87	var b strings.Builder88	b.WriteString("# Linktree\n\n")89	if profiles.Size() == 0 {90		b.WriteString("_No profiles yet. Call `SetBio` or `AddLink` to create one._\n")91		return b.String()92	}93	b.WriteString("Profiles:\n\n")94	profiles.Iterate("", "", func(key string, _ interface{}) bool {95		b.WriteString("- [")96		b.WriteString(key)97		b.WriteString("](/r/REPLACE_ADDR/linktree:")98		b.WriteString(key)99		b.WriteString(")\n")100		return false101	})102	return b.String()103}104105func renderProfile(addr string) string {106	var b strings.Builder107	b.WriteString("# ")108	b.WriteString(addr)109	b.WriteString("\n\n")110111	v := profiles.Get(addr)112	if v == nil {113		b.WriteString("_No profile for this address._\n")114		return b.String()115	}116	p := v.(*profile)117118	if p.Bio != "" {119		b.WriteString(p.Bio)120		b.WriteString("\n\n")121	}122123	if len(p.Links) == 0 {124		b.WriteString("_No links yet._\n")125		return b.String()126	}127128	b.WriteString("## Links\n\n")129	for _, l := range p.Links {130		b.WriteString("- [")131		b.WriteString(l.Label)132		b.WriteString("](")133		b.WriteString(l.URL)134		b.WriteString(")\n")135	}136	return b.String()137}138