all: embed CSS and index HTML template using memfs

Previously, with direct embed, every time we change the CSS or index
template, we need to restart the "ciigo serve" command.

Using memfs make us easy to update and see the changes directly, without
restarting the server.

1 files changed, 34 insertions, 9 deletions

diff --git a/filehtml.go b/filehtml.go
index f770ad8..6e5a080 100644
--- a/filehtml.go
+++ b/filehtml.go
@@ -1,11 +1,12 @@
-// SPDX-FileCopyrightText: 2019 Shulhan <ms@kilabit.info>
 // SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2019 Shulhan <ms@kilabit.info>
 
 package ciigo
 
 import (
 	"fmt"
 	"html/template"
+	"log"
 	"strings"
 
 	"git.sr.ht/~shulhan/asciidoctor-go"
@@ -18,7 +19,7 @@ const (
 // fileHTML represent an HTML metadata for header and its body.
 type fileHTML struct {
 	Title       string
-	EmbeddedCSS *template.CSS
+	EmbeddedCSS template.CSS
 	Styles      []string
 	Body        template.HTML
 	Metadata    map[string]string
@@ -38,6 +39,7 @@ func (fhtml *fileHTML) unpackAdocMetadata(doc *asciidoctor.Document) {
 		k string
 		v string
 	)
+	var withStylesheet bool
 
 	fhtml.Title = doc.Title.String()
 	fhtml.Styles = fhtml.Styles[:0]
@@ -47,6 +49,8 @@ func (fhtml *fileHTML) unpackAdocMetadata(doc *asciidoctor.Document) {
 		case asciidoctor.DocAttrStylesheet:
 			if len(v) != 0 {
 				fhtml.Styles = append(fhtml.Styles, v)
+			} else {
+				withStylesheet = true
 			}
 		case asciidoctor.DocAttrAuthorNames:
 			fhtml.Metadata[asciidoctor.DocAttrAuthor] = v
@@ -56,10 +60,7 @@ func (fhtml *fileHTML) unpackAdocMetadata(doc *asciidoctor.Document) {
 			fhtml.Metadata[k] = v
 		}
 	}
-
-	if len(fhtml.Styles) == 0 {
-		fhtml.EmbeddedCSS = embeddedCSS()
-	}
+	fhtml.initCSS(withStylesheet)
 }
 
 func (fhtml *fileHTML) unpackMarkdownMetadata(metadata map[string]any) {
@@ -69,6 +70,10 @@ func (fhtml *fileHTML) unpackMarkdownMetadata(metadata map[string]any) {
 		vstr string
 		ok   bool
 	)
+	// On markdown, the default stylesheet is true.
+	// User need to explicitly set `stylesheet: false`
+	// on metadata to turn it off.
+	var withStylesheet = true
 
 	fhtml.Styles = fhtml.Styles[:0]
 
@@ -81,7 +86,11 @@ func (fhtml *fileHTML) unpackMarkdownMetadata(metadata map[string]any) {
 		key = strings.ToLower(key)
 		switch key {
 		case asciidoctor.DocAttrStylesheet:
-			fhtml.Styles = append(fhtml.Styles, vstr)
+			if vstr == `false` {
+				withStylesheet = false
+			} else {
+				fhtml.Styles = append(fhtml.Styles, vstr)
+			}
 		case metadataTitle:
 			fhtml.Title = vstr
 		default:
@@ -90,8 +99,24 @@ func (fhtml *fileHTML) unpackMarkdownMetadata(metadata map[string]any) {
 			fhtml.Metadata[key] = vstr
 		}
 	}
+	fhtml.initCSS(withStylesheet)
+}
+
+func (fhtml *fileHTML) initCSS(withStylesheet bool) {
+	var logp = `initCSS`
 
-	if len(fhtml.Styles) == 0 {
-		fhtml.EmbeddedCSS = embeddedCSS()
+	if len(fhtml.Styles) != 0 {
+		// User defined their custom CSS throught ":stylesheet:"
+		return
+	}
+	if !withStylesheet {
+		// User unset the stylesheet throught ":stylesheet!".
+		return
+	}
+	css, err := staticfs.Get(`/ciigo.css`)
+	if err != nil {
+		log.Printf(`%s: %s`, logp, err)
+		return
 	}
+	fhtml.EmbeddedCSS = template.CSS(string(css.Content))
 }