Add support for some #+OPTIONS toggles

see https://orgmode.org/manual/Export-settings.html

org/document.go

@@ -85,6 +85,7 @@ func NewDocument() *Document {
 		DefaultSettings: map[string]string{
 			"TODO":         "TODO | DONE",
 			"EXCLUDE_TAGS": "noexport",
+			"OPTIONS":      "toc:t e:t f:t pri:t todo:t tags:t",
 		},
 		Log: log.New(os.Stderr, "go-org: ", 0),
 	}
@@ -180,6 +181,24 @@ func (d *Document) Get(key string) string {
 	return ""
 }
 
+// see https://orgmode.org/manual/Export-settings.html
+func (d *Document) GetOption(key string) bool {
+	for _, field := range strings.Fields(d.Get("OPTIONS")) {
+		if strings.HasPrefix(field, key) {
+			switch field[len(key)+len(":"):] {
+			case "t":
+				return true
+			case "nil":
+				return false
+			default:
+				d.Log.Printf("Bad value for export option %s (%s)", key, field)
+				return false
+			}
+		}
+	}
+	return false
+}
+
 func (d *Document) parseOne(i int, stop stopFn) (consumed int, node Node) {
 	switch d.tokens[i].kind {
 	case "unorderedList", "orderedList":

org/html_writer.go

@@ -14,9 +14,9 @@ import (
 
 type HTMLWriter struct {
 	stringBuilder
+	document           *Document
 	HighlightCodeBlock func(source, lang string) string
 	htmlEscape         bool
-	excludeTags        []string
 	log                *log.Logger
 }
 
@@ -67,7 +67,7 @@ func (w *HTMLWriter) nodesAsString(nodes ...Node) string {
 }
 
 func (w *HTMLWriter) before(d *Document) {
-	w.excludeTags = strings.Fields(d.Get("EXCLUDE_TAGS"))
+	w.document = d
 	w.log = d.Log
 	w.writeOutline(d)
 }
@@ -193,7 +193,7 @@ func (w *HTMLWriter) writeFootnoteDefinition(f FootnoteDefinition) {
 }
 
 func (w *HTMLWriter) writeFootnotes(d *Document) {
-	if len(d.Footnotes.Definitions) == 0 {
+	if !w.document.GetOption("f") || len(d.Footnotes.Definitions) == 0 {
 		return
 	}
 	w.WriteString(`<div class="footnotes">` + "\n")
@@ -206,7 +206,7 @@ func (w *HTMLWriter) writeFootnotes(d *Document) {
 }
 
 func (w *HTMLWriter) writeOutline(d *Document) {
-	if len(d.Outline.Children) != 0 {
+	if w.document.GetOption("toc") && len(d.Outline.Children) != 0 {
 		w.WriteString("<nav>\n<ul>\n")
 		for _, section := range d.Outline.Children {
 			w.writeSection(section)
@@ -231,7 +231,7 @@ func (w *HTMLWriter) writeSection(section *Section) {
 }
 
 func (w *HTMLWriter) writeHeadline(h Headline) {
-	for _, excludeTag := range w.excludeTags {
+	for _, excludeTag := range strings.Fields(w.document.Get("EXCLUDE_TAGS")) {
 		for _, tag := range h.Tags {
 			if excludeTag == tag {
 				return
@@ -240,15 +240,15 @@ func (w *HTMLWriter) writeHeadline(h Headline) {
 	}
 
 	w.WriteString(fmt.Sprintf(`<h%d id="%s">`, h.Lvl, h.ID()) + "\n")
-	if h.Status != "" {
+	if w.document.GetOption("todo") && h.Status != "" {
 		w.WriteString(fmt.Sprintf(`<span class="todo">%s</span>`, h.Status) + "\n")
 	}
-	if h.Priority != "" {
+	if w.document.GetOption("pri") && h.Priority != "" {
 		w.WriteString(fmt.Sprintf(`<span class="priority">[%s]</span>`, h.Priority) + "\n")
 	}
 
 	w.writeNodes(h.Title...)
-	if len(h.Tags) != 0 {
+	if w.document.GetOption("tags") && len(h.Tags) != 0 {
 		tags := make([]string, len(h.Tags))
 		for i, tag := range h.Tags {
 			tags[i] = fmt.Sprintf(`<span>%s</span>`, tag)
@@ -263,7 +263,7 @@ func (w *HTMLWriter) writeHeadline(h Headline) {
 func (w *HTMLWriter) writeText(t Text) {
 	if !w.htmlEscape {
 		w.WriteString(t.Content)
-	} else if t.IsRaw {
+	} else if !w.document.GetOption("e") || t.IsRaw {
 		w.WriteString(html.EscapeString(t.Content))
 	} else {
 		w.WriteString(html.EscapeString(htmlEntityReplacer.Replace(t.Content)))
@@ -293,6 +293,9 @@ func (w *HTMLWriter) writeExplicitLineBreak(l ExplicitLineBreak) {
 }
 
 func (w *HTMLWriter) writeFootnoteLink(l FootnoteLink) {
+	if !w.document.GetOption("f") {
+		return
+	}
 	n := html.EscapeString(l.Name)
 	w.WriteString(fmt.Sprintf(`<sup class="footnote-reference"><a id="footnote-reference-%s" href="#footnote-%s">%s</a></sup>`, n, n, n))
 }

org/testdata/options.html

@@ -0,0 +1,45 @@
+<h1 id="headline-1">
+<code class="verbatim">#+OPTIONS:</code> toggles supported by <code class="verbatim">go-org</code>
+</h1>
+<p>
+<code class="verbatim">go-org</code> supports multiple export toggles as described in the <a href="https://orgmode.org/manual/Export-settings.html">export settings</a> Org mode manual.
+By default those toggles are enabled. This files starts with <code class="verbatim">#+OPTIONS:</code> (empty options) and thus
+disables all settings.
+That means, entities like <code class="verbatim">---</code> --- (mdash) will be left untouched, footnotes like <code class="verbatim">[fn:1]</code>  will
+not be exported and there won&#39;t be a table of contents at the top.
+Also, the above headline will be exported without priority, todo status &amp; tags.
+</p>
+<table>
+<thead>
+<tr>
+<th>key</th>
+<th>description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>f</td>
+<td>Include footnotes (definitions &amp; links)</td>
+</tr>
+<tr>
+<td>e</td>
+<td>Include entities</td>
+</tr>
+<tr>
+<td>toc</td>
+<td>Include table of contents (outline)</td>
+</tr>
+<tr>
+<td>pri</td>
+<td>Include priority <code class="verbatim">[#A]</code>, <code class="verbatim">[#B]</code>, <code class="verbatim">[#C]</code> in headline title</td>
+</tr>
+<tr>
+<td>todo</td>
+<td>Include todo status in headline title</td>
+</tr>
+<tr>
+<td>tags</td>
+<td>Include tags in headline title</td>
+</tr>
+</tbody>
+</table>

org/testdata/options.org

@@ -0,0 +1,22 @@
+#+OPTIONS:
+
+* DONE [#A] =#+OPTIONS:= toggles supported by =go-org=                 :tag1:tag2:
+=go-org= supports multiple export toggles as described in the [[https://orgmode.org/manual/Export-settings.html][export settings]] Org mode manual.
+By default those toggles are enabled. This files starts with =#+OPTIONS:= (empty options) and thus
+disables all settings.
+That means, entities like =---= --- (mdash) will be left untouched, footnotes like =[fn:1]= [fn:1] will
+not be exported and there won't be a table of contents at the top.
+Also, the above headline will be exported without priority, todo status & tags.
+
+
+| key  | description                                               |
+|------+-----------------------------------------------------------|
+| f    | Include footnotes (definitions & links)                   |
+| e    | Include entities                                          |
+| toc  | Include table of contents (outline)                       |
+|------+-----------------------------------------------------------|
+| pri  | Include priority =[#A]=, =[#B]=, =[#C]= in headline title |
+| todo | Include todo status in headline title                     |
+| tags | Include tags in headline title                            |
+
+[fn:1] This footnote definition won't be printed

org/testdata/options.pretty_org

@@ -0,0 +1,22 @@
+#+OPTIONS:
+
+* DONE [#A] =#+OPTIONS:= toggles supported by =go-org=            :tag1:tag2:
+=go-org= supports multiple export toggles as described in the [[https://orgmode.org/manual/Export-settings.html][export settings]] Org mode manual.
+By default those toggles are enabled. This files starts with =#+OPTIONS:= (empty options) and thus
+disables all settings.
+That means, entities like =---= --- (mdash) will be left untouched, footnotes like =[fn:1]= [fn:1] will
+not be exported and there won't be a table of contents at the top.
+Also, the above headline will be exported without priority, todo status & tags.
+
+
+| key  | description                                               |
+|------+-----------------------------------------------------------|
+| f    | Include footnotes (definitions & links)                   |
+| e    | Include entities                                          |
+| toc  | Include table of contents (outline)                       |
+|------+-----------------------------------------------------------|
+| pri  | Include priority =[#A]=, =[#B]=, =[#C]= in headline title |
+| todo | Include todo status in headline title                     |
+| tags | Include tags in headline title                            |
+
+[fn:1] This footnote definition won't be printed