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blog.go
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blog.go
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// Simple blog
package blog
import (
"bytes"
"encoding/json"
"html/template"
"io/ioutil"
"strconv"
"strings"
"emperror.dev/errors"
"github.com/shurcooL/github_flavored_markdown"
"github.com/sirupsen/logrus"
)
var (
fmap = make(map[string]interface{})
posts = make([]*Post, 0)
)
type PostMeta struct {
Author string
Date string
Title string
ID int
}
type Post struct {
Meta *PostMeta
RenderedBody template.HTML
}
func LoadPosts() error {
files, err := ioutil.ReadDir("posts/")
if err != nil {
return errors.WithMessage(err, "readDir")
}
loaded := 0
for _, v := range files {
name := v.Name()
if !strings.HasSuffix(name, ".md") {
continue
}
split := strings.SplitN(name, "-", 2)
if len(split) < 2 {
logrus.Warn("Blog: Failed parsing filename " + name + ", skipping...")
continue
}
parsedID, err := strconv.Atoi(split[0])
if err != nil {
logrus.WithError(err).WithField("post", name).Error("Blog: Failed parsing post id")
continue
}
if parsedID >= len(posts) {
oldPosts := posts
posts = make([]*Post, parsedID+1)
copy(posts, oldPosts)
}
post, err := readPost("posts/" + name)
if err != nil {
logrus.WithError(err).Error("Blog: Failed reading post")
continue
}
post.Meta.ID = parsedID
posts[parsedID] = post
loaded++
}
logrus.Info("Loaded ", loaded, " blog posts!")
return nil
}
func readPost(path string) (*Post, error) {
f, err := ioutil.ReadFile(path)
if err != nil {
return nil, errors.WithMessage(err, "readPost "+path)
}
p, err := parsePost(f)
return p, errors.WithMessage(err, "readPost "+path)
}
func parsePost(data []byte) (*Post, error) {
buf := bytes.NewBuffer(data)
var meta *PostMeta
dec := json.NewDecoder(buf)
err := dec.Decode(&meta)
if err != nil {
return nil, errors.WithMessage(err, "parsePost")
}
rest, err := ioutil.ReadAll(dec.Buffered())
if err != nil {
return nil, errors.WithMessage(err, "parsePost")
}
if buf.Len() > 0 {
rest = append(rest, buf.Bytes()...)
}
rendered := github_flavored_markdown.Markdown(rest)
p := &Post{
Meta: meta,
RenderedBody: template.HTML(string(rendered)),
}
return p, nil
}
func GetPost(id int) *Post {
if id >= len(posts) {
return nil
}
return posts[id]
}
func GetPostsNewest(limit, offset int) []*Post {
result := make([]*Post, 0, limit)
i := len(posts) - (offset + 1)
if i >= len(posts) {
i = len(posts) - 1
}
for i >= 0 {
p := GetPost(i)
if p != nil {
result = append(result, p)
if len(result) >= limit {
break
}
}
i--
}
return result
}