gno.land/r/moul/x/daily/todos/v0⧉

1// Package todos is a shared, on-chain to-do board realm.2//3// Anyone can add an item; the caller's address is recorded as the author.4// Items can be toggled (open/done) or removed. Render exposes the board as5// Markdown checkboxes with open/done counts, newest item first.6package todos78import (9	"strconv"10	"strings"1112	"gno.land/p/nt/avl/v0"13)1415// item is one entry on the board. `address` is the uverse bech32 type — it is16// persistable (unlike a `realm` value), so it is safe to store across txs.17type item struct {18	id     int19	text   string20	done   bool21	author address22}2324var (25	// items is keyed by zero-padded id string so avl iteration is ordered by id.26	items  avl.Tree27	nextID int28)2930// Add appends a new item authored by the caller and returns its id.31//32// Crossing function: takes `cur realm` first (gno 0.9 interrealm convention),33// authenticates with cur.IsCurrent() before trusting cur.Previous().34func Add(cur realm, text string) int {35	if !cur.IsCurrent() {36		panic("spoofed realm")37	}38	text = strings.TrimSpace(text)39	if text == "" {40		panic("todos: text must not be empty")41	}4243	author := cur.Previous().Address()4445	nextID++46	id := nextID47	items.Set(idKey(id), &item{48		id:     id,49		text:   text,50		done:   false,51		author: author,52	})53	return id54}5556// Toggle flips the done state of the item with the given id.57func Toggle(cur realm, id int) {58	if !cur.IsCurrent() {59		panic("spoofed realm")60	}61	v := items.Get(idKey(id))62	if v == nil {63		panic("todos: item not found: #" + strconv.Itoa(id))64	}65	it := v.(*item)66	it.done = !it.done67}6869// Remove deletes the item with the given id.70func Remove(cur realm, id int) {71	if !cur.IsCurrent() {72		panic("spoofed realm")73	}74	if _, removed := items.Remove(idKey(id)); !removed {75		panic("todos: item not found: #" + strconv.Itoa(id))76	}77}7879// idKey renders an id as a fixed-width, zero-padded key so avl.Tree's80// byte-lexicographic ordering matches numeric id ordering.81func idKey(id int) string {82	s := strconv.Itoa(id)83	const width = 1284	if len(s) >= width {85		return s86	}87	return strings.Repeat("0", width-len(s)) + s88}8990// shortAddr renders an address as "g1abc…" (first 6 chars + ellipsis).91func shortAddr(a address) string {92	s := a.String()93	if len(s) <= 6 {94		return s95	}96	return s[:6] + "…"97}9899// counts returns the number of open and done items.100func counts() (open, done int) {101	items.Iterate("", "", func(_ string, v interface{}) bool {102		if v.(*item).done {103			done++104		} else {105			open++106		}107		return false108	})109	return open, done110}111112// Render returns the board as Markdown. Newest item (highest id) first.113//114// Render is NOT a crossing function (no `cur realm` param) — it is read-only115// and invoked by gnoweb, not via MsgCall.116func Render(path string) string {117	open, done := counts()118119	var b strings.Builder120	b.WriteString("# Shared To-Do Board\n\n")121	b.WriteString(strconv.Itoa(open) + " open · ")122	b.WriteString(strconv.Itoa(done) + " done · ")123	b.WriteString(strconv.Itoa(open+done) + " total\n\n")124125	if open+done == 0 {126		b.WriteString("_No items yet. Add one with `Add(text)`._\n")127		return b.String()128	}129130	// Collect in ascending id order, then emit newest first.131	var lines []string132	items.Iterate("", "", func(_ string, v interface{}) bool {133		it := v.(*item)134		mark := " "135		if it.done {136			mark = "x"137		}138		line := "- [" + mark + "] #" + strconv.Itoa(it.id) + " " +139			it.text + " (" + shortAddr(it.author) + ")"140		lines = append(lines, line)141		return false142	})143144	for i := len(lines) - 1; i >= 0; i-- {145		b.WriteString(lines[i])146		b.WriteString("\n")147	}148149	return b.String()150}151