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render.go
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render.go
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/*
Copyright © 2020 Raphael Pour <info@raphaelpour.de>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cmd
import (
"fmt"
"html/template"
"io/ioutil"
"os"
"path/filepath"
"github.com/RaphaelPour/blogctl/pkg/metadata"
"github.com/gomarkdown/markdown"
"github.com/spf13/cobra"
)
type Post struct {
Content string
Rendered template.HTML
Metadata *metadata.Metadata
}
// renderCmd represents the render command
var renderCmd = &cobra.Command{
Use: "render",
Short: "Renders blog to static website",
Long: "Collects all posts and renders the markdown using the metadata as static website",
RunE: func(cmd *cobra.Command, args []string) error {
if _, err := os.Stat(OutPath); !os.IsNotExist(err) && !Force {
return fmt.Errorf("Output folder already exists")
}
if err := os.MkdirAll(OutPath, os.ModePerm); err != nil {
return fmt.Errorf("Error creating output folder: %s", err)
}
postDirs, err := ioutil.ReadDir(BlogPath)
if err != nil {
return fmt.Errorf("Error reading blog path: %s", err)
}
posts := make([]Post, 0)
for i, dir := range postDirs {
fmt.Printf("Processing post #%02d: %s\n", i, dir.Name())
if !dir.IsDir() {
continue
}
postPath := filepath.Join(BlogPath, dir.Name())
files, err := ioutil.ReadDir(postPath)
if err != nil {
return fmt.Errorf("Error reading post path of %s: %s", postPath, err)
}
if len(files) != 2 {
return fmt.Errorf(
"Unexpected count of files in post path %s. Found: %d",
postPath,
len(files),
)
}
metadata, err := metadata.Load(postPath)
if err != nil {
return err
}
content, err := ioutil.ReadFile(GetContentFile(postPath))
if err != nil {
return fmt.Errorf("Error reading post content %s: %s", postPath, err)
}
rendered := markdown.ToHTML(content, nil, nil)
posts = append(posts, Post{
Metadata: metadata,
Content: string(content),
Rendered: template.HTML(rendered),
})
}
/* Put everything together */
t, err := template.New("blog").Parse(TEMPLATE)
if err != nil {
return fmt.Errorf("Error parsing the html template: %s", err)
}
/* Save site to out dir */
sitePath := filepath.Join(OutPath, INDEX_FILE)
file, err := os.Create(sitePath)
if err != nil {
return fmt.Errorf("Error creating index file: %s", err)
}
if err := t.Execute(file, posts); err != nil {
return fmt.Errorf("Error rendering posts: %s", err)
}
if err := file.Close(); err != nil {
return fmt.Errorf("Error closing file: %s", err)
}
return nil
},
}
const (
DEFAULT_OUT_PATH = "./out/"
INDEX_FILE = "index.html"
TEMPLATE = `
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Blog</title>
</head>
<body>
{{range .}}<div>{{ .Rendered }}</div>{{else}}<div><strong>no posts</strong></div>{{end}}
</body>
</html>`
)
var (
OutPath string
Force bool
)
func init() {
rootCmd.AddCommand(renderCmd)
rootCmd.Flags().StringVarP(
&OutPath,
"out",
"o",
DEFAULT_OUT_PATH,
"Output folder.",
)
rootCmd.Flags().BoolVarP(
&Force,
"force",
"f",
false,
"Overwrites an existing output folder.",
)
}