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|
package render
import (
"bytes"
"context"
"fmt"
"html/template"
"net/url"
"path"
"path/filepath"
"strconv"
"strings"
"dev.mediocregopher.com/mediocre-blog.git/src/gmi/gemtext"
"dev.mediocregopher.com/mediocre-blog.git/src/post"
"github.com/gomarkdown/markdown"
"github.com/gomarkdown/markdown/html"
"github.com/gomarkdown/markdown/parser"
gmnhg "github.com/tdemin/gmnhg"
)
type ctxKey string
const (
ctxKeyPost ctxKey = "post"
)
// WithPost sets the post on a Context, such that it can be retrieved using
// the GetThisPost method.
func WithPost(ctx context.Context, p post.StoredPost) context.Context {
return context.WithValue(ctx, ctxKeyPost, p)
}
// GetPostsRes are the fields returned from the GetPosts method.
type GetPostsRes struct {
Posts []post.StoredPost
HasMore bool
}
// GetPostSeriesNextPreviousRes are the fields returned from the
// GetPostSeriesNextPreviousRes method.
type GetPostSeriesNextPreviousRes struct {
Next *post.StoredPost
Previous *post.StoredPost
}
// Methods carries methods which are designed to be accessible from a template.
type Methods struct {
ctx context.Context
url *url.URL
publicURL *url.URL
geminiGatewayURL *url.URL
postStore post.Store
preprocessFuncs post.PreprocessFunctions
thisPost *post.StoredPost // cache
}
// NewMethods initializes a Methods using its required dependencies.
func NewMethods(
ctx context.Context,
url *url.URL,
publicURL *url.URL,
geminiGatewayURL *url.URL,
postStore post.Store,
preprocessFuncs post.PreprocessFunctions,
) *Methods {
return &Methods{
ctx,
url,
publicURL,
geminiGatewayURL,
postStore,
preprocessFuncs,
nil, // thisPost
}
}
func (m *Methods) GetPosts(page, count int) (GetPostsRes, error) {
posts, hasMore, err := m.postStore.Get(page, count)
return GetPostsRes{posts, hasMore}, err
}
func (m *Methods) GetThisPost() (p post.StoredPost, err error) {
if m.thisPost != nil {
return *m.thisPost, nil
}
defer func() {
m.thisPost = &p
}()
if p, ok := m.ctx.Value(ctxKeyPost).(post.StoredPost); ok {
return p, nil
}
id := path.Base(m.url.Path)
id = strings.TrimSuffix(id, path.Ext(id))
return m.postStore.GetByID(id)
}
func (m *Methods) GetPostByID(id string) (post.StoredPost, error) {
p, err := m.postStore.GetByID(id)
if err != nil {
return post.StoredPost{}, fmt.Errorf("fetching post %q: %w", id, err)
}
return p, nil
}
func (m *Methods) GetPostSeriesNextPrevious(
p post.StoredPost,
) (
GetPostSeriesNextPreviousRes, error,
) {
seriesPosts, err := m.postStore.GetBySeries(p.Series)
if err != nil {
return GetPostSeriesNextPreviousRes{}, fmt.Errorf(
"fetching posts for series %q: %w", p.Series, err,
)
}
var (
res GetPostSeriesNextPreviousRes
foundThis bool
)
for i := range seriesPosts {
seriesPost := seriesPosts[i]
if seriesPost.ID == p.ID {
foundThis = true
continue
}
if !foundThis {
res.Next = &seriesPost
continue
}
res.Previous = &seriesPost
break
}
return res, nil
}
func (m *Methods) PostGemtextBody(p post.StoredPost) (string, error) {
buf := new(bytes.Buffer)
if err := p.PreprocessBody(buf, m.preprocessFuncs); err != nil {
return "", fmt.Errorf("preprocessing post body: %w", err)
}
bodyBytes := buf.Bytes()
if p.Format == post.FormatMarkdown {
gemtextBodyBytes, err := gmnhg.RenderMarkdown(bodyBytes, 0)
if err != nil {
return "", fmt.Errorf("converting from markdown: %w", err)
}
bodyBytes = gemtextBodyBytes
}
return string(bodyBytes), nil
}
func (m *Methods) PostHTMLBody(p post.StoredPost) (template.HTML, error) {
bodyBuf := new(bytes.Buffer)
if err := p.PreprocessBody(bodyBuf, m.preprocessFuncs); err != nil {
return "", fmt.Errorf("preprocessing post body: %w", err)
}
if p.Format == post.FormatGemtext {
prevBodyBuf := bodyBuf
bodyBuf = new(bytes.Buffer)
err := gemtext.ToMarkdown(
bodyBuf, prevBodyBuf, m.geminiGatewayURL,
)
if err != nil {
return "", fmt.Errorf("converting gemtext to markdown: %w", err)
}
}
// this helps the markdown renderer properly parse pages which end in a
// `</script>` tag... I don't know why.
_, _ = bodyBuf.WriteString("\n")
parserExt := parser.CommonExtensions | parser.AutoHeadingIDs
parser := parser.NewWithExtensions(parserExt)
htmlFlags := html.HrefTargetBlank
htmlRenderer := html.NewRenderer(html.RendererOptions{Flags: htmlFlags})
renderedBody := markdown.ToHTML(bodyBuf.Bytes(), parser, htmlRenderer)
return template.HTML(renderedBody), nil
}
func (m *Methods) GetQueryValue(key, def string) string {
v := m.url.Query().Get(key)
if v == "" {
v = def
}
return v
}
func (m *Methods) GetQueryIntValue(key string, def int) (int, error) {
vStr := m.GetQueryValue(key, strconv.Itoa(def))
return strconv.Atoi(vStr)
}
func (m *Methods) GetPath() (string, error) {
basePath := filepath.Join("/", m.publicURL.Path) // in case it's empty
return filepath.Rel(basePath, m.url.Path)
}
func (m *Methods) Add(a, b int) int { return a + b }
|
