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main.go - raw
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//go:generate templ generate
//go:generate go run .
package main

import (
	"context"
	"embed"
	"flag"
	"fmt"
	"io"
	iofs "io/fs"
	"net/http"
	"os"
	"path/filepath"
	"time"

	"github.com/alecthomas/chroma/v2/styles"
	"github.com/gorilla/feeds"
)

var (
	//go:embed articles/*
	articleFS embed.FS
	//go:embed static/*
	staticFS embed.FS
	ref      string = "main"
)

func init() {
	if r, ok := os.LookupEnv("BLOG_REF"); ok {
		ref = r
	}
}

func maine() error {
	fs := flag.NewFlagSet("blog", flag.ExitOnError)
	outFlag := fs.String("out", "out", "Output directory")
	fs.StringVar(outFlag, "o", *outFlag, "--out")
	serveFlag := fs.Bool("serve", false, "Serve output dir after generation")
	fs.BoolVar(serveFlag, "s", *serveFlag, "--serve")
	if err := fs.Parse(os.Args[1:]); err != nil {
		return err
	}

	files, err := articleFS.ReadDir("articles")
	if err != nil {
		return err
	}

	categories := make(Articles)
	articles := make([]Article, 0, len(files))
	for _, file := range files {
		if filepath.Ext(file.Name()) != ".md" {
			continue
		}
		path := fmt.Sprintf("articles/%s", file.Name())
		content, err := iofs.ReadFile(articleFS, path)
		if err != nil {
			return err
		}
		article, err := Parse(string(content))
		if err != nil {
			return err
		}
		article.path = path
		categories[article.Category] = append(categories[article.Category], article)
		articles = append(articles, article)
		if err := writeArticle(*outFlag, article); err != nil {
			return err
		}
	}

	if err := writeCSS(*outFlag); err != nil {
		return err
	}

	if err := copyStatic(*outFlag); err != nil {
		return err
	}

	if err := writeRSS(*outFlag, articles); err != nil {
		return err
	}

	fi, err := os.Create(filepath.Join(*outFlag, "index.html"))
	if err != nil {
		return err
	}
	defer fi.Close()

	if err := IndexTemplate(categories).Render(context.Background(), fi); err != nil {
		return err
	}

	if *serveFlag {
		fmt.Println("http://localhost:8080")
		http.Handle("/", http.FileServer(http.Dir("out")))
		http.ListenAndServe(":8080", nil)
	}

	return nil
}

func writeArticle(out string, article Article) error {
	dest := filepath.Join(out, article.Slug(), "index.html")
	if err := os.MkdirAll(filepath.Dir(dest), os.ModePerm); err != nil {
		return err
	}

	fi, err := os.Create(dest)
	if err != nil {
		return err
	}
	defer fi.Close()

	return ArticleTemplate(article).Render(context.Background(), fi)
}

func writeRSS(out string, articles []Article) error {
	fi, err := os.Create(filepath.Join(out, "feed.atom"))
	if err != nil {
		return err
	}
	defer fi.Close()

	feed := &feeds.Feed{
		Title:       "jolheiser",
		Link:        &feeds.Link{Href: "https://blog.jolheiser.com"},
		Description: "jolheiser's blog log in a blog bog",
		Author: &feeds.Author{
			Name:  "John Olheiser",
			Email: "john@jolheiser.com",
		},
		Updated: time.Now(),
		Created: time.Date(2024, time.February, 25, 0, 0, 0, 0, time.Local),
		// Image:       &feeds.Image{},
	}
	for _, article := range articles {
		url := fmt.Sprintf("https://blog.jolheiser.com/%s", article.Slug())
		feed.Items = append(feed.Items, &feeds.Item{
			Title:       article.Title,
			Link:        &feeds.Link{Href: url},
			Description: article.Summary,
			Id:          url,
			Created:     article.Date,
			// Content:     article.Content,
		})
	}

	return feed.WriteAtom(fi)
}

func writeCSS(out string) error {
	fi, err := os.Create(filepath.Join(out, "chroma.css"))
	if err != nil {
		return err
	}
	defer fi.Close()

	if err := CSS.WriteCSS(fi, styles.Get("catppuccin-latte")); err != nil {
		return err
	}
	fi.WriteString("@media (prefers-color-scheme: dark) {")
	if err := CSS.WriteCSS(fi, styles.Get("catppuccin-mocha")); err != nil {
		return err
	}
	fi.WriteString("}")
	return nil
}

func copyStatic(out string) error {
	files, err := staticFS.ReadDir("static")
	if err != nil {
		return err
	}
	for _, file := range files {
		if err := func() error {
			dstFi, err := os.Create(filepath.Join(out, file.Name()))
			if err != nil {
				return err
			}
			defer dstFi.Close()

			srcFi, err := staticFS.Open("static/" + file.Name())
			if err != nil {
				return err
			}
			defer srcFi.Close()

			if _, err := io.Copy(dstFi, srcFi); err != nil {
				return err
			}

			return nil
		}(); err != nil {
			return err
		}
	}
	return nil
}

func copyFile(dst, src string) error {
	srcFi, err := os.Open(src)
	if err != nil {
		return err
	}
	defer srcFi.Close()

	dstFi, err := os.Create(dst)
	if err != nil {
		return err
	}
	defer dstFi.Close()

	if _, err := io.Copy(dstFi, srcFi); err != nil {
		return err
	}

	return nil
}

func main() {
	if err := maine(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}