103 lines
1.8 KiB
Go
103 lines
1.8 KiB
Go
package main
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import (
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"slices"
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"strings"
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"time"
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)
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type PostWithDate struct {
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Post string
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Date time.Time
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}
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func getAllPosts(dir string) ([]string, error) {
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entries, err := os.ReadDir(dir)
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if err != nil {
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return []string{}, err
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}
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posts := make([]PostWithDate, 0)
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for _, entry := range entries {
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if filepath.Ext(entry.Name()) != ".md" {
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continue
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}
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content, err := os.ReadFile(filepath.Join(dir, entry.Name()))
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if err != nil {
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return []string{}, err
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}
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postInfo, err := getPostInfo(string(content))
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if err != nil {
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return []string{}, err
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}
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posts = append(posts, PostWithDate{
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Post: string(content),
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Date: postInfo.Date,
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})
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}
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slices.SortFunc(posts, func(a PostWithDate, b PostWithDate) int {
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if a.Date.Before(b.Date) {
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return 1
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} else {
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return -1
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}
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})
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justPosts := make([]string, len(posts))
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for i, v := range posts {
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justPosts[i] = v.Post
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}
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return justPosts, nil
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}
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type postInfo struct {
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Title string
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Date time.Time
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}
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// TODO: this could actually be a parser
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// Pull out the old course notes on recursive descent.
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func getPostInfo(post string) (postInfo, error) {
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lines := strings.Split(post, "\n")
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if len(lines) == 0 {
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return postInfo{}, errors.New("Post has 0 lines")
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}
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if lines[0] != "+++" {
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return postInfo{}, errors.New("Post does not contain metadata field +++ on first line")
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}
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info := postInfo{}
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for _, line := range lines {
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splitLine := strings.Split(line, " = ")
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if len(splitLine) != 2 {
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continue
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}
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switch splitLine[0] {
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case "title":
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info.Title = splitLine[1]
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case "date":
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t, err := time.Parse(time.DateOnly, splitLine[1][1:len(splitLine[1])-1])
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if err != nil {
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continue
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}
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info.Date = t
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}
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}
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return info, nil
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}
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