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package markdown
import (
"bytes"
"fmt"
"io/fs"
"os"
"path"
"path/filepath"
"strings"
"github.com/adrg/frontmatter"
)
type Content struct {
Meta map[string]any
Body string
Path string
}
func ParseContents(contentPath string) ([]Content, error) {
contentFiles, err := glob(contentPath, ".md")
if err != nil {
return nil, fmt.Errorf("failed to glob: %v", err)
}
res := make([]Content, 0, len(contentFiles))
for _, contentFile := range contentFiles {
c, err := parseMarkdownFile(contentPath, contentFile)
if err != nil {
return nil, fmt.Errorf("failed to read markdown file: %v", err)
}
res = append(res, c)
}
return res, nil
}
func walk(filename string, linkDirname string, walkFn filepath.WalkFunc) error {
symWalkFunc := func(path string, info os.FileInfo, err error) error {
if fname, err := filepath.Rel(filename, path); err == nil {
path = filepath.Join(linkDirname, fname)
} else {
return err
}
if err == nil && info.Mode()&os.ModeSymlink == os.ModeSymlink {
finalPath, err := filepath.EvalSymlinks(path)
if err != nil {
return err
}
info, err := os.Lstat(finalPath)
if err != nil {
return walkFn(path, info, err)
}
if info.IsDir() {
return walk(finalPath, path, walkFn)
}
}
return walkFn(path, info, err)
}
return filepath.Walk(filename, symWalkFunc)
}
// Walk extends filepath.Walk to also follow symlinks
func Walk(path string, walkFn filepath.WalkFunc) error {
return walk(path, path, walkFn)
}
// glob returns relative file paths that match the extension
func glob(dir string, ext string) ([]string, error) {
files := []string{}
err := Walk(dir, func(path string, info fs.FileInfo, err error) error {
if filepath.Ext(path) == ext {
// just diff
relPath, _ := filepath.Rel(dir, path)
files = append(files, relPath)
}
return nil
})
return files, err
}
func parseMarkdownFile(basePath, contentPath string) (Content, error) {
input, err := os.ReadFile(path.Join(basePath, contentPath))
if err != nil {
return Content{}, fmt.Errorf("failed to read post: %v", err)
}
matter := map[string]any{}
matter["template"] = "default"
rest, err := frontmatter.Parse(bytes.NewBuffer(input), &matter)
if err != nil {
return Content{}, fmt.Errorf("failed to parse frontmatter: %v", err)
}
path := strings.Replace(contentPath, ".md", ".html", 1)
mc := Content{
Body: string(rest),
Path: path,
Meta: matter,
}
return mc, nil
}
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