From c23030733fe4cba578b14ad2c1d1292891202562 Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Thu, 19 Jan 2023 16:02:27 +0100
Subject: Add support for gemtext posts

---
 src/http/posts.go | 94 +++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 74 insertions(+), 20 deletions(-)

(limited to 'src/http/posts.go')

diff --git a/src/http/posts.go b/src/http/posts.go
index 0f8924a..eff0eaa 100644
--- a/src/http/posts.go
+++ b/src/http/posts.go
@@ -15,37 +15,68 @@ import (
 	"github.com/gomarkdown/markdown"
 	"github.com/gomarkdown/markdown/html"
 	"github.com/gomarkdown/markdown/parser"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/gmi"
 	"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
 	"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
 	"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
 )
 
-func (a *api) parsePostBody(post post.Post) (*txttpl.Template, error) {
+func (a *api) parsePostBody(p post.Post) (*txttpl.Template, error) {
 	tpl := txttpl.New("root")
 	tpl = tpl.Funcs(txttpl.FuncMap(a.tplFuncs()))
 
 	tpl = txttpl.Must(tpl.New("image.html").Parse(mustReadTplFile("image.html")))
-	tpl = tpl.Funcs(txttpl.FuncMap{
-		"Image": func(id string) (string, error) {
-
-			tplPayload := struct {
-				ID        string
-				Resizable bool
-			}{
-				ID:        id,
-				Resizable: isImgResizable(id),
-			}
 
-			buf := new(bytes.Buffer)
-			if err := tpl.ExecuteTemplate(buf, "image.html", tplPayload); err != nil {
-				return "", err
-			}
+	if p.Format == post.FormatMarkdown {
+		tpl = tpl.Funcs(txttpl.FuncMap{
+			"Image": func(id string) (string, error) {
+
+				tplPayload := struct {
+					ID        string
+					Descr     string
+					Resizable bool
+				}{
+					ID: id,
+					// I could use variadic args to make this work, I think
+					Descr:     "TODO: proper alt text",
+					Resizable: isImgResizable(id),
+				}
+
+				buf := new(bytes.Buffer)
+				if err := tpl.ExecuteTemplate(buf, "image.html", tplPayload); err != nil {
+					return "", err
+				}
+
+				return buf.String(), nil
+			},
+		})
+	}
 
-			return buf.String(), nil
-		},
-	})
+	if p.Format == post.FormatGemtext {
+		tpl = tpl.Funcs(txttpl.FuncMap{
+			"Image": func(id, descr string) (string, error) {
+
+				tplPayload := struct {
+					ID        string
+					Descr     string
+					Resizable bool
+				}{
+					ID:        id,
+					Descr:     descr,
+					Resizable: isImgResizable(id),
+				}
+
+				buf := new(bytes.Buffer)
+				if err := tpl.ExecuteTemplate(buf, "image.html", tplPayload); err != nil {
+					return "", err
+				}
+
+				return buf.String(), nil
+			},
+		})
+	}
 
-	tpl, err := tpl.New(post.ID + "-body.html").Parse(post.Body)
+	tpl, err := tpl.New(p.ID + "-body.html").Parse(p.Body)
 
 	if err != nil {
 		return nil, err
@@ -73,6 +104,16 @@ func (a *api) postToPostTplPayload(storedPost post.StoredPost) (postTplPayload,
 		return postTplPayload{}, fmt.Errorf("executing post body as template: %w", err)
 	}
 
+	if storedPost.Format == post.FormatGemtext {
+
+		prevBodyBuf := bodyBuf
+		bodyBuf = new(bytes.Buffer)
+
+		if err := gmi.GemtextToMarkdown(bodyBuf, prevBodyBuf); err != nil {
+			return postTplPayload{}, 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")
@@ -324,10 +365,12 @@ func (a *api) editPostHandler(isDraft bool) http.Handler {
 			Post    post.StoredPost
 			Tags    []string
 			IsDraft bool
+			Formats []post.Format
 		}{
 			Post:    storedPost,
 			Tags:    tags,
 			IsDraft: isDraft,
+			Formats: post.Formats,
 		}
 
 		executeTemplate(rw, r, tpl, tplPayload)
@@ -336,12 +379,23 @@ func (a *api) editPostHandler(isDraft bool) http.Handler {
 
 func postFromPostReq(r *http.Request) (post.Post, error) {
 
+	formatStr := r.PostFormValue("format")
+	if formatStr == "" {
+		return post.Post{}, errors.New("format is required")
+	}
+
+	format, err := post.FormatFromString(formatStr)
+	if err != nil {
+		return post.Post{}, fmt.Errorf("parsing format: %w", err)
+	}
+
 	p := post.Post{
 		ID:          r.PostFormValue("id"),
 		Title:       r.PostFormValue("title"),
 		Description: r.PostFormValue("description"),
 		Tags:        strings.Fields(r.PostFormValue("tags")),
 		Series:      r.PostFormValue("series"),
+		Format:      format,
 	}
 
 	// textareas encode newlines as CRLF for historical reasons
@@ -353,7 +407,7 @@ func postFromPostReq(r *http.Request) (post.Post, error) {
 		p.Title == "" ||
 		p.Body == "" ||
 		len(p.Tags) == 0 {
-		return post.Post{}, errors.New("ID, Title, Tags, and Body are all required")
+		return post.Post{}, errors.New("id, ritle, tags, and body are all required")
 	}
 
 	return p, nil
-- 
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