From bba986e96a1a8b8856a2b7989841f4383a406ec9 Mon Sep 17 00:00:00 2001
From: "Gustavo L de Mello (Guz)" <contact@guz.one>
Date: Thu, 9 Jan 2025 10:22:00 -0300
Subject: [PATCH] feat(blogo): render step and renderer plugins

---
 blogo/blogo.go    | 34 ++++++++++++++++++----------------
 blogo/defaults.go |  9 +++++++++
 2 files changed, 27 insertions(+), 16 deletions(-)

diff --git a/blogo/blogo.go b/blogo/blogo.go
index 49829ce..12d8c55 100644
--- a/blogo/blogo.go
+++ b/blogo/blogo.go
@@ -32,6 +32,7 @@ type Blogo struct {
 	files fs.FS
 
 	sources   []SourcerPlugin
+	renderers []RendererPlugin
 
 	log   *slog.Logger
 	panic bool
@@ -64,6 +65,10 @@ func (b *Blogo) Use(p Plugin) {
 		log.Debug("Added plugin", slog.String("type", "SourcerPlugin"))
 		b.sources = append(b.sources, p)
 	}
+	if p, ok := p.(RendererPlugin); ok {
+		log.Debug("Added plugin", slog.String("type", "RenderPlugin"))
+		b.renderers = append(b.renderers, p)
+	}
 }
 
 func (b *Blogo) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -109,26 +114,19 @@ func (b *Blogo) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	log.Debug("Writing response file")
 
-	buf := make([]byte, 1024)
-	for {
-		n, err := f.Read(buf)
-		if err != nil && err != io.EOF {
-			w.WriteHeader(http.StatusInternalServerError)
-			_, _ = w.Write([]byte(err.Error()))
-		}
+	log.Debug("Rendering file")
 
-		if n == 0 {
-			break
-		}
+	// TODO: Support for multiple renderers (conditional renderers)
+	err = b.renderers[0].Render(f, w)
+	if err != nil {
+		log.Error("Failed to render file", slog.String("error", err.Error()))
 
-		_, err = w.Write(buf[:n])
-		if err != nil {
-			w.WriteHeader(http.StatusInternalServerError)
-			_, _ = w.Write([]byte(err.Error()))
-		}
+		w.WriteHeader(http.StatusInternalServerError)
+		_, _ = w.Write([]byte(err.Error()))
+		return
 	}
 
-	b.log.Debug("Finished responding file")
+	log.Debug("Finished responding file")
 }
 
 func (b *Blogo) Init() error {
@@ -138,6 +136,10 @@ func (b *Blogo) Init() error {
 		b.log.Debug("No SourcerPlugin found, using default one")
 		b.Use(&defaultSourcer{})
 	}
+	if len(b.renderers) == 0 {
+		b.log.Debug("No RendererPlugin found, using default one")
+		b.Use(&defaultRenderer{})
+	}
 
 	fs, err := b.sources[0].Source() // TOOD: Support for multiple sources (via another plugin or built-in, with prefixes or not)
 	if err != nil {
diff --git a/blogo/defaults.go b/blogo/defaults.go
index 8939f32..f626c83 100644
--- a/blogo/defaults.go
+++ b/blogo/defaults.go
@@ -21,3 +21,12 @@ func (f emptyFS) Open(name string) (fs.File, error) {
 	return nil, fs.ErrNotExist
 }
 
+type defaultRenderer struct{}
+
+func (p *defaultRenderer) Name() string {
+	return "blogo-default-renderer"
+}
+
+func (p *defaultRenderer) Render(f fs.File, w io.Writer) error {
+	return nil
+}