Update go-org to optimize code (#8824)

go.mod

 	github.com/mschoch/smat v0.0.0-20160514031455-90eadee771ae // indirect
 	github.com/msteinert/pam v0.0.0-20151204160544-02ccfbfaf0cc
 	github.com/nfnt/resize v0.0.0-20160724205520-891127d8d1b5
-	github.com/niklasfasching/go-org v0.1.7
+	github.com/niklasfasching/go-org v0.1.8
 	github.com/oliamb/cutter v0.2.2
 	github.com/philhofer/fwd v1.0.0 // indirect
 	github.com/pkg/errors v0.8.1
 	github.com/willf/bitset v0.0.0-20180426185212-8ce1146b8621 // indirect
 	github.com/yohcop/openid-go v0.0.0-20160914080427-2c050d2dae53
 	golang.org/x/crypto v0.0.0-20190927123631-a832865fa7ad
-	golang.org/x/net v0.0.0-20191028085509-fe3aa8a45271
+	golang.org/x/net v0.0.0-20191101175033-0deb6923b6d9
 	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
 	golang.org/x/sys v0.0.0-20190910064555-bbd175535a8b
 	golang.org/x/text v0.3.2

go.sum

 github.com/niklasfasching/go-org v0.1.6/go.mod h1:AsLD6X7djzRIz4/RFZu8vwRL0VGjUvGZCCH1Nz0VdrU=
 github.com/niklasfasching/go-org v0.1.7 h1:t3V+3XnS/7BhKv/7SlMUa8FvAiq577/a1T3D7mLIRXE=
 github.com/niklasfasching/go-org v0.1.7/go.mod h1:AsLD6X7djzRIz4/RFZu8vwRL0VGjUvGZCCH1Nz0VdrU=
+github.com/niklasfasching/go-org v0.1.8 h1:Kjvs6lP+LIILHhc9zIJ4Gu90a/pVY483if2Qmu8v4Fg=
+github.com/niklasfasching/go-org v0.1.8/go.mod h1:AsLD6X7djzRIz4/RFZu8vwRL0VGjUvGZCCH1Nz0VdrU=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/oliamb/cutter v0.2.2 h1:Lfwkya0HHNU1YLnGv2hTkzHfasrSMkgv4Dn+5rmlk3k=
 github.com/oliamb/cutter v0.2.2/go.mod h1:4BenG2/4GuRBDbVm/OPahDVqbrOemzpPiG5mi1iryBU=
 golang.org/x/net v0.0.0-20190909003024-a7b16738d86b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191028085509-fe3aa8a45271 h1:N66aaryRB3Ax92gH0v3hp1QYZ3zWWCCUR/j8Ifh45Ss=
 golang.org/x/net v0.0.0-20191028085509-fe3aa8a45271/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20191101175033-0deb6923b6d9 h1:DPz9iiH3YoKiKhX/ijjoZvT0VFwK2c6CWYWQ7Zyr8TU=
+golang.org/x/net v0.0.0-20191101175033-0deb6923b6d9/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180620175406-ef147856a6dd/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421 h1:Wo7BWFiOk0QRFMLYMqJGFMd9CgUAcGx7V+qEg/h5IBI=

modules/markup/orgmode/orgmode.go

 	"bytes"
 	"fmt"
 	"html"
-	"strings"
 
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup"
 
 	description := string(link)
 	if l.Description != nil {
-		description = r.nodesAsString(l.Description...)
+		description = r.WriteNodesAsString(l.Description...)
 	}
 	switch l.Kind() {
 	case "image":
 		r.WriteString(fmt.Sprintf(`<a href="%s" title="%s">%s</a>`, link, description, description))
 	}
 }
-
-func (r *Renderer) emptyClone() *Renderer {
-	wcopy := *(r.HTMLWriter)
-	wcopy.Builder = strings.Builder{}
-
-	rcopy := *r
-	rcopy.HTMLWriter = &wcopy
-
-	wcopy.ExtendingWriter = &rcopy
-
-	return &rcopy
-}
-
-func (r *Renderer) nodesAsString(nodes ...org.Node) string {
-	tmp := r.emptyClone()
-	org.WriteNodes(tmp, nodes...)
-	return tmp.String()
-}

vendor/github.com/niklasfasching/go-org/org/block.go

 	}
 }
 
-func (n Example) String() string { return orgWriter.nodesAsString(n) }
-func (n Block) String() string   { return orgWriter.nodesAsString(n) }
+func (n Example) String() string { return orgWriter.WriteNodesAsString(n) }
+func (n Block) String() string   { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/document.go

 }
 
 // String returns the pretty printed Org mode string for the given nodes (see OrgWriter).
-func String(nodes []Node) string { return orgWriter.nodesAsString(nodes...) }
+func String(nodes []Node) string { return orgWriter.WriteNodesAsString(nodes...) }
 
 // Write is called after with an instance of the Writer interface to export a parsed Document into another format.
 func (d *Document) Write(w Writer) (out string, err error) {

vendor/github.com/niklasfasching/go-org/org/drawer.go

 	return "", false
 }
 
-func (n Drawer) String() string         { return orgWriter.nodesAsString(n) }
-func (n PropertyDrawer) String() string { return orgWriter.nodesAsString(n) }
+func (n Drawer) String() string         { return orgWriter.WriteNodesAsString(n) }
+func (n PropertyDrawer) String() string { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/footnote.go

 	return consumed, definition
 }
 
-func (n FootnoteDefinition) String() string { return orgWriter.nodesAsString(n) }
+func (n FootnoteDefinition) String() string { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/headline.go

 	}
 }
 
-func (n Headline) String() string { return orgWriter.nodesAsString(n) }
+func (n Headline) String() string { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/html_writer.go

 	}
 }
 
-func (w *HTMLWriter) emptyClone() *HTMLWriter {
-	wcopy := *w
-	wcopy.Builder = strings.Builder{}
-	return &wcopy
-}
-
-func (w *HTMLWriter) nodesAsString(nodes ...Node) string {
-	tmp := w.emptyClone()
-	WriteNodes(tmp, nodes...)
-	return tmp.String()
+func (w *HTMLWriter) WriteNodesAsString(nodes ...Node) string {
+	original := w.Builder
+	w.Builder = strings.Builder{}
+	WriteNodes(w, nodes...)
+	out := w.String()
+	w.Builder = original
+	return out
 }
 
 func (w *HTMLWriter) WriterWithExtensions() Writer {
 func (w *HTMLWriter) WriteBlock(b Block) {
 	content := ""
 	if isRawTextBlock(b.Name) {
-		exportWriter := w.emptyClone()
-		exportWriter.htmlEscape = false
-		WriteNodes(exportWriter, b.Children...)
-		content = strings.TrimRightFunc(exportWriter.String(), unicode.IsSpace)
+		builder, htmlEscape := w.Builder, w.htmlEscape
+		w.Builder, w.htmlEscape = strings.Builder{}, false
+		WriteNodes(w, b.Children...)
+		out := w.String()
+		w.Builder, w.htmlEscape = builder, htmlEscape
+		content = strings.TrimRightFunc(out, unicode.IsSpace)
 	} else {
-		content = w.nodesAsString(b.Children...)
+		content = w.WriteNodesAsString(b.Children...)
 	}
 	switch name := b.Name; {
 	case name == "SRC":
 	// NOTE: To satisfy hugo ExtractTOC() check we cannot use `<li>\n` here. Doesn't really matter, just a note.
 	w.WriteString("<li>")
 	h := section.Headline
-	title := cleanHeadlineTitleForHTMLAnchorRegexp.ReplaceAllString(w.nodesAsString(h.Title...), "")
+	title := cleanHeadlineTitleForHTMLAnchorRegexp.ReplaceAllString(w.WriteNodesAsString(h.Title...), "")
 	w.WriteString(fmt.Sprintf("<a href=\"#%s\">%s</a>\n", h.ID(), title))
 	if len(section.Children) != 0 {
 		w.WriteString("<ul>\n")
 	}
 	description := url
 	if l.Description != nil {
-		description = w.nodesAsString(l.Description...)
+		description = w.WriteNodesAsString(l.Description...)
 	}
 	switch l.Kind() {
 	case "image":
 }
 
 func (w *HTMLWriter) WriteNodeWithMeta(n NodeWithMeta) {
-	out := w.nodesAsString(n.Node)
+	out := w.WriteNodesAsString(n.Node)
 	if p, ok := n.Node.(Paragraph); ok {
 		if len(p.Children) == 1 && isImageOrVideoLink(p.Children[0]) {
-			out = w.nodesAsString(p.Children[0])
+			out = w.WriteNodesAsString(p.Children[0])
 		}
 	}
 	for _, attributes := range n.Meta.HTMLAttributes {
 			if i != 0 {
 				caption += " "
 			}
-			caption += w.nodesAsString(ns...)
+			caption += w.WriteNodesAsString(ns...)
 		}
 		out = fmt.Sprintf("<figure>\n%s<figcaption>\n%s\n</figcaption>\n</figure>\n", out, caption)
 	}

vendor/github.com/niklasfasching/go-org/org/inline.go

 	switch {
 	case start+2 >= len(input):
 	case input[start+1] == '\\' && start != 0 && input[start-1] != '\n':
-		for i := start + 2; unicode.IsSpace(rune(input[i])); i++ {
-			if i >= len(input) || input[i] == '\n' {
+		for i := start + 2; i <= len(input)-1 && unicode.IsSpace(rune(input[i])); i++ {
+			if input[i] == '\n' {
 				return i + 1 - start, ExplicitLineBreak{}
 			}
 		}
 	return "regular"
 }
 
-func (n Text) String() string              { return orgWriter.nodesAsString(n) }
-func (n LineBreak) String() string         { return orgWriter.nodesAsString(n) }
-func (n ExplicitLineBreak) String() string { return orgWriter.nodesAsString(n) }
-func (n StatisticToken) String() string    { return orgWriter.nodesAsString(n) }
-func (n Emphasis) String() string          { return orgWriter.nodesAsString(n) }
-func (n LatexFragment) String() string     { return orgWriter.nodesAsString(n) }
-func (n FootnoteLink) String() string      { return orgWriter.nodesAsString(n) }
-func (n RegularLink) String() string       { return orgWriter.nodesAsString(n) }
-func (n Timestamp) String() string         { return orgWriter.nodesAsString(n) }
+func (n Text) String() string              { return orgWriter.WriteNodesAsString(n) }
+func (n LineBreak) String() string         { return orgWriter.WriteNodesAsString(n) }
+func (n ExplicitLineBreak) String() string { return orgWriter.WriteNodesAsString(n) }
+func (n StatisticToken) String() string    { return orgWriter.WriteNodesAsString(n) }
+func (n Emphasis) String() string          { return orgWriter.WriteNodesAsString(n) }
+func (n LatexFragment) String() string     { return orgWriter.WriteNodesAsString(n) }
+func (n FootnoteLink) String() string      { return orgWriter.WriteNodesAsString(n) }
+func (n RegularLink) String() string       { return orgWriter.WriteNodesAsString(n) }
+func (n Timestamp) String() string         { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/keyword.go

 	return 1, k
 }
 
-func (n Comment) String() string      { return orgWriter.nodesAsString(n) }
-func (n Keyword) String() string      { return orgWriter.nodesAsString(n) }
-func (n NodeWithMeta) String() string { return orgWriter.nodesAsString(n) }
-func (n NodeWithName) String() string { return orgWriter.nodesAsString(n) }
-func (n Include) String() string      { return orgWriter.nodesAsString(n) }
+func (n Comment) String() string      { return orgWriter.WriteNodesAsString(n) }
+func (n Keyword) String() string      { return orgWriter.WriteNodesAsString(n) }
+func (n NodeWithMeta) String() string { return orgWriter.WriteNodesAsString(n) }
+func (n NodeWithName) String() string { return orgWriter.WriteNodesAsString(n) }
+func (n Include) String() string      { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/list.go

 	return i - start, ListItem{bullet, status, nodes}
 }
 
-func (n List) String() string                { return orgWriter.nodesAsString(n) }
-func (n ListItem) String() string            { return orgWriter.nodesAsString(n) }
-func (n DescriptiveListItem) String() string { return orgWriter.nodesAsString(n) }
+func (n List) String() string                { return orgWriter.WriteNodesAsString(n) }
+func (n ListItem) String() string            { return orgWriter.WriteNodesAsString(n) }
+func (n DescriptiveListItem) String() string { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/org_writer.go

 func (w *OrgWriter) Before(d *Document) {}
 func (w *OrgWriter) After(d *Document)  {}
 
-func (w *OrgWriter) emptyClone() *OrgWriter {
-	wcopy := *w
-	wcopy.Builder = strings.Builder{}
-	return &wcopy
-}
-
-func (w *OrgWriter) nodesAsString(nodes ...Node) string {
-	tmp := w.emptyClone()
-	WriteNodes(tmp, nodes...)
-	return tmp.String()
+func (w *OrgWriter) WriteNodesAsString(nodes ...Node) string {
+	builder := w.Builder
+	w.Builder = strings.Builder{}
+	WriteNodes(w, nodes...)
+	out := w.String()
+	w.Builder = builder
+	return out
 }
 
 func (w *OrgWriter) WriteHeadline(h Headline) {
-	tmp := w.emptyClone()
-	tmp.WriteString(strings.Repeat("*", h.Lvl))
+	start := w.Len()
+	w.WriteString(strings.Repeat("*", h.Lvl))
 	if h.Status != "" {
-		tmp.WriteString(" " + h.Status)
+		w.WriteString(" " + h.Status)
 	}
 	if h.Priority != "" {
-		tmp.WriteString(" [#" + h.Priority + "]")
+		w.WriteString(" [#" + h.Priority + "]")
 	}
-	tmp.WriteString(" ")
-	WriteNodes(tmp, h.Title...)
-	hString := tmp.String()
+	w.WriteString(" ")
+	WriteNodes(w, h.Title...)
 	if len(h.Tags) != 0 {
 		tString := ":" + strings.Join(h.Tags, ":") + ":"
-		if n := w.TagsColumn - len(tString) - len(hString); n > 0 {
-			w.WriteString(hString + strings.Repeat(" ", n) + tString)
+		if n := w.TagsColumn - len(tString) - (w.Len() - start); n > 0 {
+			w.WriteString(strings.Repeat(" ", n) + tString)
 		} else {
-			w.WriteString(hString + " " + tString)
+			w.WriteString(" " + tString)
 		}
-	} else {
-		w.WriteString(hString)
 	}
 	w.WriteString("\n")
 	if len(h.Children) != 0 {
 
 func (w *OrgWriter) WriteFootnoteDefinition(f FootnoteDefinition) {
 	w.WriteString(fmt.Sprintf("[fn:%s]", f.Name))
-	content := w.nodesAsString(f.Children...)
+	content := w.WriteNodesAsString(f.Children...)
 	if content != "" && !unicode.IsSpace(rune(content[0])) {
 		w.WriteString(" ")
 	}
 }
 
 func (w *OrgWriter) WriteParagraph(p Paragraph) {
-	content := w.nodesAsString(p.Children...)
+	content := w.WriteNodesAsString(p.Children...)
 	if len(content) > 0 && content[0] != '\n' {
 		w.WriteString(w.indent)
 	}
 func (w *OrgWriter) WriteExample(e Example) {
 	for _, n := range e.Children {
 		w.WriteString(w.indent + ":")
-		if content := w.nodesAsString(n); content != "" {
+		if content := w.WriteNodesAsString(n); content != "" {
 			w.WriteString(" " + content)
 		}
 		w.WriteString("\n")
 func (w *OrgWriter) WriteList(l List) { WriteNodes(w, l.Items...) }
 
 func (w *OrgWriter) WriteListItem(li ListItem) {
-	liWriter := w.emptyClone()
-	liWriter.indent = w.indent + strings.Repeat(" ", len(li.Bullet)+1)
-	WriteNodes(liWriter, li.Children...)
-	content := strings.TrimPrefix(liWriter.String(), liWriter.indent)
+	originalBuilder, originalIndent := w.Builder, w.indent
+	w.Builder, w.indent = strings.Builder{}, w.indent+strings.Repeat(" ", len(li.Bullet)+1)
+	WriteNodes(w, li.Children...)
+	content := strings.TrimPrefix(w.String(), w.indent)
+	w.Builder, w.indent = originalBuilder, originalIndent
 	w.WriteString(w.indent + li.Bullet)
 	if li.Status != "" {
 		w.WriteString(fmt.Sprintf(" [%s]", li.Status))
 	}
 	indent := w.indent + strings.Repeat(" ", len(di.Bullet)+1)
 	if len(di.Term) != 0 {
-		term := w.nodesAsString(di.Term...)
+		term := w.WriteNodesAsString(di.Term...)
 		w.WriteString(" " + term + " ::")
 		indent = indent + strings.Repeat(" ", len(term)+4)
 	}
-	diWriter := w.emptyClone()
-	diWriter.indent = indent
-	WriteNodes(diWriter, di.Details...)
-	details := strings.TrimPrefix(diWriter.String(), diWriter.indent)
+	originalBuilder, originalIndent := w.Builder, w.indent
+	w.Builder, w.indent = strings.Builder{}, indent
+	WriteNodes(w, di.Details...)
+	details := strings.TrimPrefix(w.String(), w.indent)
+	w.Builder, w.indent = originalBuilder, originalIndent
 	if len(details) > 0 && details[0] == '\n' {
 		w.WriteString(details)
 	} else {
 			w.WriteString(`|`)
 			for _, column := range row.Columns {
 				w.WriteString(` `)
-				content := w.nodesAsString(column.Children...)
+				content := w.WriteNodesAsString(column.Children...)
 				if content == "" {
 					content = " "
 				}
 	} else if l.Description == nil {
 		w.WriteString(fmt.Sprintf("[[%s]]", l.URL))
 	} else {
-		descriptionWriter := w.emptyClone()
-		WriteNodes(descriptionWriter, l.Description...)
-		description := descriptionWriter.String()
-		w.WriteString(fmt.Sprintf("[[%s][%s]]", l.URL, description))
+		w.WriteString(fmt.Sprintf("[[%s][%s]]", l.URL, w.WriteNodesAsString(l.Description...)))
 	}
 }

vendor/github.com/niklasfasching/go-org/org/paragraph.go

 	return 1, HorizontalRule{}
 }
 
-func (n Paragraph) String() string      { return orgWriter.nodesAsString(n) }
-func (n HorizontalRule) String() string { return orgWriter.nodesAsString(n) }
+func (n Paragraph) String() string      { return orgWriter.WriteNodesAsString(n) }
+func (n HorizontalRule) String() string { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/table.go

 	return isAlignRow
 }
 
-func (n Table) String() string { return orgWriter.nodesAsString(n) }
+func (n Table) String() string { return orgWriter.WriteNodesAsString(n) }

vendor/github.com/niklasfasching/go-org/org/writer.go

 	String() string   // String is called at the very end to retrieve the final output.
 
 	WriterWithExtensions() Writer
+	WriteNodesAsString(...Node) string
 
 	WriteKeyword(Keyword)
 	WriteInclude(Include)

vendor/golang.org/x/net/idna/tables11.0.0.go

 // Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
 
-// +build go1.13
+// +build go1.13,!go1.14
 
 package idna
 

vendor/modules.txt

 github.com/msteinert/pam
 # github.com/nfnt/resize v0.0.0-20160724205520-891127d8d1b5
 github.com/nfnt/resize
-# github.com/niklasfasching/go-org v0.1.7
+# github.com/niklasfasching/go-org v0.1.8
 github.com/niklasfasching/go-org/org
 # github.com/oliamb/cutter v0.2.2
 github.com/oliamb/cutter
 golang.org/x/crypto/ssh
 golang.org/x/crypto/ssh/agent
 golang.org/x/crypto/ssh/knownhosts
-# golang.org/x/net v0.0.0-20191028085509-fe3aa8a45271
+# golang.org/x/net v0.0.0-20191101175033-0deb6923b6d9
 golang.org/x/net/context
 golang.org/x/net/context/ctxhttp
 golang.org/x/net/html