posts.gno

 1package minisocial
 2
 3import (
 4	"chain/runtime"
 5	"errors"
 6	"time"
 7
 8	"gno.land/p/moul/helplink"
 9	"gno.land/p/nt/ufmt"
10)
11
12var posts []*Post // inefficient for large amounts of posts; see v2
13
14// CreatePost creates a new post
15func CreatePost(_ realm, text string) error {
16	// If the body of the post is empty, return an error
17	if text == "" {
18		return errors.New("empty post text")
19	}
20
21	// Append the new post to the list
22	posts = append(posts, &Post{
23		text:      text,                              // Set the input text
24		author:    runtime.PreviousRealm().Address(), // The author of the address is the previous realm, the realm that called this one
25		createdAt: time.Now(),                        // Capture the time of the transaction, in this case the block timestamp
26	})
27
28	return nil
29}
30
31func Render(_ string) string {
32	output := "# MiniSocial\n\n" // \n is needed just like in standard Markdown
33	// Create a clickable link to create a post
34	output += helplink.Func("Write a post!", "CreatePost", "text", "")
35	output += "\n\n"
36
37	// Handle the edge case
38	if len(posts) == 0 {
39		output += "No posts.\n"
40		return output
41	}
42
43	// Let's append the text of each post to the output
44	for i, post := range posts {
45		// Let's append some post metadata
46		output += ufmt.Sprintf("#### Post #%d\n\n", i)
47		// Add the stringified post
48		output += post.String()
49		// Add a line break for cleaner UI
50		output += "---\n\n"
51	}
52
53	return output
54}