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|
package main
import (
"bytes"
"context"
"fmt"
"os"
"path/filepath"
"strings"
txttpl "text/template"
gmnhg "github.com/tdemin/gmnhg"
"dev.mediocregopher.com/mediocre-blog.git/src/gmi"
"dev.mediocregopher.com/mediocre-blog.git/src/http"
"dev.mediocregopher.com/mediocre-blog.git/src/post"
"dev.mediocregopher.com/mediocre-blog.git/src/render"
"dev.mediocregopher.com/mediocre-go-lib.git/mctx"
"dev.mediocregopher.com/mediocre-go-lib.git/mlog"
)
var postFileExtensions = map[post.Format]string{
post.FormatGemtext: "gmi",
post.FormatMarkdown: "md",
}
func postTargetFormat(p post.StoredPost) post.Format {
if p.Format == post.FormatMarkdown && strings.Contains(p.Body, `</`) {
return post.FormatMarkdown
}
return post.FormatGemtext
}
func writePostBody(p post.StoredPost, path, body string) error {
f, err := os.Create(path)
if err != nil {
return fmt.Errorf("opening file: %w", err)
}
defer func() { _ = f.Close() }()
writeString := func(str string) {
if err != nil {
return
}
_, err = f.WriteString(str)
}
if f := postTargetFormat(p); f == post.FormatGemtext {
writeString("=> ../posts/ Back to All Posts\n\n")
} else if f == post.FormatMarkdown {
writeString(fmt.Sprintf("---\nTitle: %q\n---\n", p.Title))
writeString("[Back to All Posts](../posts/)\n\n")
}
writeString(fmt.Sprintf("# %s\n\n", p.Title))
if p.Description != "" {
writeString(fmt.Sprintf("> %s\n\n", p.Description))
}
writeString(body)
writeString(fmt.Sprintf("\n-----\n\nPublished %s\n", p.PublishedAt.Format("2006-01-02")))
return err
}
func writePosts(
urlBuilder render.URLBuilder, posts []post.StoredPost, path string,
) error {
f, err := os.Create(path)
if err != nil {
return fmt.Errorf("opening file: %w", err)
}
defer func() { _ = f.Close() }()
writeString := func(str string) {
if err != nil {
return
}
_, err = f.WriteString(str)
}
writeString("# Posts\n\n")
for _, p := range posts {
var (
targetFormat = postTargetFormat(p)
u = urlBuilder.Post(p.ID)
)
if targetFormat == post.FormatMarkdown {
u = u.HTTP()
}
writeString(fmt.Sprintf(
"=> %s %s - %s\n\n",
u.String(),
p.PublishedAt.Format("2006-01-02"),
p.Title,
))
}
return err
}
func exportPosts(
ctx context.Context,
logger *mlog.Logger,
postStore post.Store,
urlBuilder render.URLBuilder,
exportDirPath string,
) error {
var (
postsDir = filepath.Join(exportDirPath, "posts")
preprocessFuncs = map[post.Format]post.PreprocessFunctions{
post.FormatGemtext: gmi.PostPreprocessFuncs{URLBuilder: urlBuilder},
post.FormatMarkdown: http.NewPostPreprocessFuncs(urlBuilder),
}
)
if err := os.MkdirAll(postsDir, 0755); err != nil {
return fmt.Errorf("creating posts dir %q: %w", postsDir, err)
}
logger.Info(ctx, "Getting posts")
posts, _, err := postStore.Get(0, 10000)
if err != nil {
return fmt.Errorf("getting posts: %w", err)
}
{
postsIndexPath := filepath.Join(postsDir, "index.gmi")
ctx := mctx.Annotate(ctx, "path", postsIndexPath)
logger.Info(ctx, "Writing posts index page")
err = writePosts(urlBuilder, posts, postsIndexPath)
if err != nil {
return fmt.Errorf("writing posts index page: %w", err)
}
}
for _, p := range posts {
var (
targetFormat = postTargetFormat(p)
ext = postFileExtensions[targetFormat]
postFilePath = filepath.Join(postsDir, p.ID+"."+ext)
ctx = mctx.Annotate(
ctx,
"post_id", p.ID,
"post_title", p.Title,
"post_format", p.Format,
"target_format", targetFormat,
)
body = new(bytes.Buffer)
)
logger.Info(ctx, "Rendering post body")
tpl := txttpl.New("")
tpl, err := tpl.Parse(p.Body)
if err != nil {
return fmt.Errorf("parsing post %q body as template: %w", p.ID, err)
}
err = tpl.Execute(body, struct {
RootURL render.URLBuilder
post.PreprocessFunctions
}{
urlBuilder, preprocessFuncs[targetFormat],
})
if err != nil {
return fmt.Errorf("executing post %q body as template: %w", p.ID, err)
}
if p.Format == post.FormatMarkdown && targetFormat == post.FormatGemtext {
gemtextBodyBytes, err := gmnhg.RenderMarkdown(body.Bytes(), 0)
if err != nil {
return fmt.Errorf("converting post %q from markdown: %w", p.ID, err)
}
body = bytes.NewBuffer(gemtextBodyBytes)
}
if err := writePostBody(p, postFilePath, body.String()); err != nil {
return fmt.Errorf("writing post %q body to file %q: %w", p.ID, postFilePath, err)
}
}
return nil
}
|
