From 4970a59bfa06def2b6a42baf86cb8dfa57606b0a Mon Sep 17 00:00:00 2001
From: leohhhn <hudakleon@gmail.com>
Date: Wed, 20 Nov 2024 21:20:18 +0900
Subject: [PATCH] save

---
 .../gno.land/p/demo/pausable/pausable.gno     |  3 ++
 examples/gno.land/p/demo/users/users.gno      |  6 ---
 examples/gno.land/r/gnoland/users/errors.gno  |  6 +++
 examples/gno.land/r/gnoland/users/render.gno  |  1 +
 examples/gno.land/r/gnoland/users/users.gno   | 42 +++++++++++++++++++
 5 files changed, 52 insertions(+), 6 deletions(-)
 create mode 100644 examples/gno.land/r/gnoland/users/errors.gno
 create mode 100644 examples/gno.land/r/gnoland/users/render.gno
 create mode 100644 examples/gno.land/r/gnoland/users/users.gno

diff --git a/examples/gno.land/p/demo/pausable/pausable.gno b/examples/gno.land/p/demo/pausable/pausable.gno
index e9cce63c1e3..5c2aa69d863 100644
--- a/examples/gno.land/p/demo/pausable/pausable.gno
+++ b/examples/gno.land/p/demo/pausable/pausable.gno
@@ -1,6 +1,7 @@
 package pausable
 
 import (
+	"errors"
 	"std"
 
 	"gno.land/p/demo/ownable"
@@ -11,6 +12,8 @@ type Pausable struct {
 	paused bool
 }
 
+var ErrPaused = errors.New("realm is currently paused")
+
 // New returns a new Pausable struct with non-paused state as default
 func New() *Pausable {
 	return &Pausable{
diff --git a/examples/gno.land/p/demo/users/users.gno b/examples/gno.land/p/demo/users/users.gno
index 29c46712448..8c09b0854fa 100644
--- a/examples/gno.land/p/demo/users/users.gno
+++ b/examples/gno.land/p/demo/users/users.gno
@@ -16,8 +16,6 @@ type User struct {
 	Profile string
 	Number  int
 	Block   int
-	Invites int
-	Inviter std.Address
 }
 
 func (u *User) Render() string {
@@ -34,10 +32,6 @@ func (u *User) Render() string {
 	out += ufmt.Sprintf("- ID #%d\n\n", u.Number)
 	out += ufmt.Sprintf("- Address: %s\n\n", u.Address.String())
 	out += ufmt.Sprintf("- Registered at block #%d\n\n", u.Block)
-	out += ufmt.Sprintf("- Leftover invites: %d\n\n", u.Invites)
-	if u.Inviter != "" {
-		out += ufmt.Sprintf("- Inviter: %s\n\n", u.Inviter.String())
-	}
 
 	return out
 }
diff --git a/examples/gno.land/r/gnoland/users/errors.gno b/examples/gno.land/r/gnoland/users/errors.gno
new file mode 100644
index 00000000000..08f8bd095a5
--- /dev/null
+++ b/examples/gno.land/r/gnoland/users/errors.gno
@@ -0,0 +1,6 @@
+package users
+
+import "errors"
+
+var ErrInvalidUsername = errors.New("users: invalid username")
+var ErrAlreadyExists = errors.New("users: username already exists")
diff --git a/examples/gno.land/r/gnoland/users/render.gno b/examples/gno.land/r/gnoland/users/render.gno
new file mode 100644
index 00000000000..82abcb9fccb
--- /dev/null
+++ b/examples/gno.land/r/gnoland/users/render.gno
@@ -0,0 +1 @@
+package users
diff --git a/examples/gno.land/r/gnoland/users/users.gno b/examples/gno.land/r/gnoland/users/users.gno
new file mode 100644
index 00000000000..c84ed97da6a
--- /dev/null
+++ b/examples/gno.land/r/gnoland/users/users.gno
@@ -0,0 +1,42 @@
+package users
+
+import (
+	"github.com/gnolang/gno/examples/gno.land/p/demo/avl"
+	"github.com/gnolang/gno/examples/gno.land/p/demo/ownable"
+	p "github.com/gnolang/gno/examples/gno.land/p/demo/pausable"
+	"github.com/gnolang/gno/examples/gno.land/p/demo/seqid"
+	"regexp"
+)
+
+const reValidUsername = "^[a-zA-Z]{3}[a-zA-Z0-9]*[0-9]{3}$\n"
+
+var (
+	store      avl.Tree //
+	idCounter  seqid.ID
+	admin      = ownable.NewWithAddress("") // @moul /// switch to dao managed down the line
+	pausable   = p.NewFromOwnable(admin)    //
+	reUsername = regexp.MustCompile(reValidUsername)
+)
+
+func init() {
+	// PreRegister()
+}
+
+func Register(username, bio string) error {
+	if pausable.IsPaused() {
+		return p.ErrPaused
+	}
+
+	if store.Has(username) {
+		return ErrAlreadyExists
+	}
+
+	matched, _ := regexp.MatchString(reValidUsername, username)
+	if !matched {
+		return ErrInvalidUsername
+	}
+
+	store.Set(username)
+
+	return nil
+}