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|
package page
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/russross/blackfriday"
"gopkg.in/yaml.v3"
)
type Page struct {
Path string
Title string
Head string
Description string
Tags map[string]interface{}
Date *PageTime
Published bool
Vars map[string]interface{}
Markdown []byte
}
// Can be adjusted to change the base template used in rendering
var BaseTemplate = "inc/base.html"
// Used to split the .md files into yaml and markdown
var DocumentSplit = "|---\n"
// Renders a page
func (p *Page) Render(wr io.Writer) error {
if err := p.Read(); err != nil {
return err
}
t, err := template.ParseFiles(BaseTemplate)
if err != nil {
return err
}
// Automatically pull from the yml file if applicable
if p.Head != "" {
t, err = t.Parse(`
{{define "head"}}
{{.RenderHead}}
{{end}}
`)
if err != nil {
return err
}
}
return t.Execute(wr, p)
}
func (p *Page) RenderHead() (string, error) {
buf := &bytes.Buffer{}
t, err := template.New("Head").Parse(p.Head)
if err != nil {
return "", err
}
err = t.Execute(buf, p)
if err != nil {
return "", err
}
return string(buf.Bytes()), nil
}
// Reads in the special markdown file format for the website off of the disk
func (p *Page) Read() error {
yamlBuf := bytes.NewBuffer(nil)
markdownBuf := bytes.NewBuffer(nil)
fh, err := os.Open(p.Path + ".md")
if err != nil {
return err
}
defer fh.Close()
rdr := bufio.NewReader(fh)
// Read in the file and split between markdown and yaml buffers
yamlDone := false
for {
bytes, err := rdr.ReadBytes('\n')
if err == io.EOF {
break
} else if err != nil {
return err
}
// Is this the line where we stop reading the yaml and start reading markdown?
if DocumentSplit == string(bytes) && !yamlDone {
yamlDone = true
continue
}
if !yamlDone {
yamlBuf.Write(bytes)
} else {
markdownBuf.Write(bytes)
}
}
err = yaml.Unmarshal(yamlBuf.Bytes(), p)
if err != nil {
return err
}
p.Markdown = markdownBuf.Bytes()
return nil
}
func (p *Page) RenderBody() (string, error) {
buf := &bytes.Buffer{}
t, err := template.New("Body").Parse(string(p.Markdown))
if err != nil {
return "", err
}
err = t.Execute(buf, p)
if err != nil {
return "", err
}
return string(blackfriday.Run(buf.Bytes())), nil
}
func (p Page) String() string {
return fmt.Sprintf("Page: %s", p.Path)
}
var pageIndex map[string]PageList
// Index returns a map of all pages below the current Page's Path seperated
// into their respective tags If a Page has multiple tags it will be listed
// under each
func (p *Page) Index() (map[string]PageList, error) {
if pageIndex != nil {
return pageIndex, nil
}
fmt.Fprintln(os.Stderr, "Rebuilding index...")
out := make(map[string]PageList)
var pageErr error
filepath.Walk(filepath.Dir(p.Path),
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() && strings.HasSuffix(info.Name(), ".md") {
p2 := &Page{Path: strings.ReplaceAll(path, ".md", "")}
err = p2.Read()
if err != nil {
pageErr = err
fmt.Fprintln(os.Stderr, "Error encountered: ", err)
return err
}
for tag, _ := range p2.Tags {
if _, ok := out[tag]; !ok {
out[tag] = []*Page{p2}
} else {
out[tag] = append(out[tag], p2)
}
}
}
return nil
})
pageIndex = out
return out, nil
}
|
