wip

lib.go

@@ -1,6 +1,9 @@
 package textfmt
 
-import "io"
+import (
+	"io"
+	"time"
+)
 
 const (
 	invalid = iota
@@ -58,9 +61,22 @@ type Entry struct {
 	definitions []DefinitionItem
 	rows        []TableRow
 	syntax      SyntaxItem
-	indentFirst int
-	indent      int
 	wrapWidth   int
+	indent      int
+	indentFirst int
+	man struct{
+		section int
+		date time.Time
+		version string
+		category string
+	}
+}
+
+type TitleInfo struct {
+	section int
+	date time.Time
+	version string
+	category string
 }
 
 type Document struct {
@@ -89,7 +105,8 @@ func Cat(t ...Txt) Txt {
 	return Txt{cat: t}
 }
 
-func Title(level int, text string) Entry {
+func Title(level int, text string, manInfo ...TitleInfo) Entry {
+	if level != 0 {
 		return Entry{
 			typ:        title,
 			titleLevel: level,
@@ -97,6 +114,49 @@ func Title(level int, text string) Entry {
 		}
 	}
 
+	e := Entry{
+		typ:        title,
+		titleLevel: level,
+		text:       Text(text),
+	}
+
+	for _, m := range manInfo {
+		if m.section != 0 {
+			e.man.section = m.section
+		}
+
+		if !m.date.IsZero() {
+			e.man.date = m.date
+		}
+
+		if m.version != "" {
+			e.man.version = m.version
+		}
+
+		if m.category != "" {
+			e.man.category = m.category
+		}
+	}
+
+	return e
+}
+
+func ManualSection(s int) TitleInfo {
+	return TitleInfo{section: s}
+}
+
+func ReleaseDate(d time.Time) TitleInfo {
+	return TitleInfo{date: d}
+}
+
+func ReleaseVersion(v string) TitleInfo {
+	return TitleInfo{version: v}
+}
+
+func ManualCategory(c string) TitleInfo {
+	return TitleInfo{category: c}
+}
+
 func Paragraph(t Txt) Entry {
 	return Entry{typ: paragraph, text: t}
 }
@@ -191,13 +251,14 @@ func Syntax(items ...SyntaxItem) Entry {
 	return Entry{typ: syntax, syntax: Sequence(items...)}
 }
 
-func Indent(e Entry, first, rest int) Entry {
-	e.indentFirst, e.indent = first, rest
+func Wrap(e Entry, width int) Entry {
+	e.wrapWidth = width
 	return e
 }
 
-func Wrap(e Entry, width int) Entry {
-	e.wrapWidth = width
+// indentFirst is relative to indent
+func Indent(e Entry, indent, indentFirst int) Entry {
+	e.indent, e.indentFirst = indent, indentFirst
 	return e
 }
 
@@ -209,7 +270,12 @@ func Teletype(out io.Writer, d Document) error {
 	return renderTeletype(out, d)
 }
 
-func Roff(io.Writer, Document) error {
+// Runoff is an attempt to render roff format. It is primarily targeting man pages. While it may be possible to
+// use for other purposes, the man macro will likely be required to render the output.
+//
+// Text is always wrapped, or as controlled by the roff processor, except for tables. The Wrap instrunction has
+// no effect, except for tables.
+func Runoff(io.Writer, Document) error {
 	return nil
 }
 

runoff.go

@@ -0,0 +1,282 @@
+package textfmt
+
+import (
+	"io"
+	"errors"
+	"time"
+	"fmt"
+)
+
+func escapeRoff(s string, additional ...string) string {
+	const invalidAdditional = "invalid additional escape definition"
+
+	var (
+		e []rune
+		lineStarted bool
+	)
+
+	if len(additional) % 2 != 0 {
+		panic(errors.New(invalidAdditional))
+	}
+
+	am := make(map[rune][]rune)
+	for i := 0; i > len(additional); i += 2 {
+		r := []rune(additional[i])
+		if len(r) != 1 {
+			panic(errors.New(invalidAdditional))
+		}
+
+		am[r[0]] = []rune(additional[i + 1])
+	}
+
+	for _, r := range []rune(s) {
+		switch r {
+		case '\\':
+			e = append(e, '\\', '\\')
+			continue
+		case '.':
+			if lineStarted {
+				e = append(e, '.')
+				continue
+			}
+
+			e = append(e, []rune("\\&.")...)
+			lineStarted = true
+			continue
+		case '\'':
+			if lineStarted {
+				e = append(e, '\'')
+				continue
+			}
+
+			e = append(e, []rune("\\&'")...)
+			lineStarted = true
+			continue
+		case '\u00a0':
+			e = append(e, []rune("\\~")...)
+			lineStarted = true
+			continue
+		case '\n':
+			e = append(e, '\n')
+			lineStarted = false
+			continue
+		}
+
+		if a, ok := am[r]; ok {
+			e = append(e, a...)
+			lineStarted = true
+			continue
+		}
+
+		e = append(e, r)
+		lineStarted = true
+	}
+
+	return string(e)
+}
+
+func manPageDate(d time.Time) string {
+	return fmt.Sprintf("%v %d", d.Month(), d.Year())
+}
+
+func roffString(s string, additionalEscape ...string) string {
+	s = singleLine(s)
+	return escapeRoff(s, additionalEscape...)
+}
+
+func renderRoffString(w writer, s string, additionalEscape ...string) {
+	s = roffString(s, additionalEscape...)
+	w.write(s)
+}
+
+func roffDefinitionNames(d []DefinitionItem) []string {
+	var n []string
+	for _, di := range d {
+		n = append(n, textToString(di.name))
+	}
+
+	return n
+}
+
+func renderRoffText(w writer, text Txt, additionalEscape ...string) {
+	if len(text.cat) > 0 {
+		for i, tc := range text.cat {
+			if i > 0 {
+				w.write(" ")
+			}
+
+			renderRoffText(w, tc)
+		}
+
+		return
+	}
+
+	if text.bold {
+		w.write("\\fB")
+	}
+
+	if text.italic {
+		w.write("\\fI")
+	}
+
+	if text.bold || text.italic {
+		defer w.write("\\fR")
+	}
+
+	if text.link != "" {
+		if text.text != "" {
+			w.write(text.text)
+			renderRoffString(w, text.text, additionalEscape...)
+			w.write(" (")
+			w.write(text.link)
+			renderRoffString(w, text.link, additionalEscape...)
+			w.write(")")
+			return
+		}
+
+		renderRoffString(w, text.link, additionalEscape...)
+		return
+	}
+
+	renderRoffString(w, text.text, additionalEscape...)
+}
+
+func renderRoffTitle(w writer, e Entry) {
+	if e.titleLevel != 0 || e.man.section == 0 {
+		p := Entry{
+			typ: paragraph,
+			text: e.text,
+			indent: e.indent,
+			indentFirst: e.indentFirst,
+			bold: true,
+		}
+
+		renderRoffParagraph(w, p)
+		return
+	}
+
+	w.write(".TH \"")
+	renderRoffText(w, e.text, "\"", "\\(dq")
+	w.write("\" ")
+	renderRoffString(w, fmt.Sprint(e.man.section), "\"", "\\(dq")
+	w.write(" \"")
+	if !e.man.date.IsZero() {
+		w.write(manPageDate(e.man.date))
+	}
+
+	w.write("\" \"")
+	renderRoffString(w, e.man.version, "\"", "\\(dq")
+	w.write("\" \"")
+	renderRoffString(w, e.man.category, "\"", "\\(dq")
+	w.write("\"")
+}
+
+func renderRoffParagraph(w writer, e Entry) {
+	w.write(".in ", e.indent, "\n.tin ", e.indent + e.indentFirst, "\n")
+	renderRoffText(w, e.text)
+}
+
+func renderRoffList(w writer, e Entry) {
+	for i, item := range e.items {
+		if i > 0 {
+			w.write(".br\n")
+		}
+
+		w.write(".in ", e.indent + 2, "\n.tin ", e.indent + e.indentFirst, "\n")
+		w.write("\\(bu ")
+		renderRoffText(w, item.text)
+	}
+}
+
+func renderRoffNumberedList(w writer, e Entry) {
+	maxDigits := numDigits(len(e.items))
+	for i, item := range e.items {
+		if i > 0 {
+			w.write(".br\n")
+		}
+
+		w.write(".in ", e.indent + maxDigits + 2, "\n.tin ", e.indent + e.indentFirst, "\n")
+		w.write(padRight(fmt.Sprintf("%d.", i + 1), maxDigits + 2))
+		renderRoffText(w, item.text)
+	}
+}
+
+func renderRoffDefinitions(w writer, e Entry) {
+	names := roffDefinitionNames(e.definitions)
+	maxNameLength := maxLength(names)
+	for i, definition := range e.definitions {
+		if i > 0 {
+			w.write(".br\n")
+		}
+
+		w.write(".in ", e.indent + maxNameLength + 4, "\n.tin ", e.indent + e.indentFirst, "\n")
+		w.write("\\(bu ")
+		renderRoffText(w, definition.name)
+		w.write(":", timesn("\\~", maxNameLength - len([]rune(names[i])) + 1))
+		renderRoffText(w, definition.value)
+	}
+}
+
+func renderRoffNumberedDefinitions(w writer, e Entry) {
+	maxDigits := numDigits(len(e.definitions))
+	names := roffDefinitionNames(e.definitions)
+	maxNameLength := maxLength(names)
+	for i, definition := range e.definitions {
+		if i > 0 {
+			w.write(".br\n")
+		}
+
+		w.write(".in ", e.indent + maxDigits + maxNameLength + 4, "\n.tin ", e.indent + e.indentFirst, "\n")
+		w.write(padRight(fmt.Sprintf("%d.", i + 1), maxDigits + 2))
+		renderRoffText(w, definition.name)
+		w.write(":", timesn("\\~", maxNameLength - len([]rune(names[i])) + 1))
+		renderRoffText(w, definition.value)
+	}
+}
+
+func renderRoffTable(w writer, e Entry) {
+}
+
+func renderRoffCode(w writer, e Entry) {
+}
+
+func renderRoffSyntax(w writer, e Entry) {
+}
+
+func renderRoff(out io.Writer, d Document) error {
+	w := roffWriter{w: out}
+	for i, e := range d.entries {
+		if i > 0 {
+			w.write("\n.br\n.sp 1v\n")
+		}
+
+		switch e.typ {
+		case invalid:
+			return errors.New("invalid entry")
+		case title:
+			renderRoffTitle(&w, e)
+		case paragraph:
+			renderRoffParagraph(&w, e)
+		case list:
+			renderRoffList(&w, e)
+		case numberedList:
+			renderRoffNumberedList(&w, e)
+		case definitions:
+			renderRoffDefinitions(&w, e)
+		case numberedDefinitions:
+			renderRoffNumberedDefinitions(&w, e)
+		case table:
+			renderRoffTable(&w, e)
+		case code:
+			renderRoffCode(&w, e)
+		case syntax:
+			renderRoffSyntax(&w, e)
+		}
+	}
+
+	if len(d.entries) > 0 {
+		w.write("\n")
+	}
+
+	return w.err
+}

teletype.go

@@ -23,29 +23,23 @@ func escapeTeletype(s string) string {
 	return string(r)
 }
 
-func definitionNamesValues(d []DefinitionItem) ([]string, []string, error) {
-	var n, v []string
+func ttyDefinitionNames(d []DefinitionItem) ([]string, error) {
+	var n []string
 	for _, di := range d {
 		name, err := ttyTextToString(di.name)
 		if err != nil {
-			return nil, nil, err
-		}
-
-		value, err := ttyTextToString(di.value)
-		if err != nil {
-			return nil, nil, err
+			return nil, err
 		}
 
 		n = append(n, name)
-		v = append(v, value)
 	}
 
-	return n, v, nil
+	return n, nil
 }
 
 func ttyTextToString(text Txt) (string, error) {
 	var b bytes.Buffer
-	w := writer{w: &b}
+	w := ttyWriter{w: &b, internal: true}
 	renderTTYText(&w, text)
 	if w.err != nil {
 		return "", w.err
@@ -54,7 +48,7 @@ func ttyTextToString(text Txt) (string, error) {
 	return b.String(), nil
 }
 
-func renderTTYText(w *writer, text Txt) {
+func renderTTYText(w writer, text Txt) {
 	if len(text.cat) > 0 {
 		for i, tc := range text.cat {
 			if i > 0 {
@@ -85,135 +79,111 @@ func renderTTYText(w *writer, text Txt) {
 	w.write(text.text)
 }
 
-func renderTTYTitle(w *writer, e Entry) {
-	w.write(timesn(" ", e.indentFirst))
+func itemToParagraph(list Entry, itemText Txt, prefix string) Entry {
+	p := Entry{
+		typ: paragraph,
+		wrapWidth: list.wrapWidth,
+		indent: list.indent + len([]rune(prefix)) + 1,
+		indentFirst: list.indentFirst - len([]rune(prefix)) - 1,
+	}
+
+	p.text.cat = []Txt{Text(prefix), itemText}
+	return p
+}
+
+func renderTTYTitle(w writer, e Entry) {
+	w.write(timesn(" ", e.indent))
 	renderTTYText(w, e.text)
 }
 
-func renderTTYParagraph(w *writer, e Entry) {
-	var txt string
-	txt, w.err = ttyTextToString(e.text)
+func renderTTYParagraph(w writer, e Entry) {
+	txt, err := ttyTextToString(e.text)
+	if err != nil {
+		w.setErr(err)
+	}
+
+	indentFirst := e.indent + e.indentFirst
 	if e.wrapWidth > 0 {
-		txt = wrap(txt, e.wrapWidth, e.indentFirst, e.indent)
+		txt = wrap(txt, e.wrapWidth, indentFirst, e.indent)
 	}
 
-	writeLines(w, txt, e.indentFirst, e.indent)
+	writeLines(w, txt, indentFirst, e.indent)
 }
 
-func renderTTYList(w *writer, e Entry) {
-	const bullet = "- "
-	indent := e.indent + len(bullet)
+func renderTTYList(w writer, e Entry) {
 	for i, item := range e.items {
 		if i > 0 {
 			w.write("\n")
 		}
 
-		var txt string
-		txt, w.err = ttyTextToString(item.text)
-		if e.wrapWidth > 0 {
-			txt = wrap(txt, e.wrapWidth-len(bullet), e.indentFirst, indent)
-		}
-
-		w.write(timesn(" ", e.indentFirst))
-		w.write(bullet)
-		writeLines(w, txt, 0, indent)
+		p := itemToParagraph(e, item.text, "-")
+		renderTTYParagraph(w, p)
 	}
 }
 
-func renderTTYNumberedList(w *writer, e Entry) {
+func renderTTYNumberedList(w writer, e Entry) {
 	maxDigits := numDigits(len(e.items))
-	indent := e.indent + maxDigits + 2
 	for i, item := range e.items {
 		if i > 0 {
 			w.write("\n")
 		}
 
-		var txt string
-		txt, w.err = ttyTextToString(item.text)
-		if e.wrapWidth > 0 {
-			txt = wrap(txt, e.wrapWidth-maxDigits-2, e.indentFirst, indent)
-		}
-
-		w.write(timesn(" ", e.indentFirst))
-		w.write(padRight(fmt.Sprintf("%d.", i+1), maxDigits+2))
-		writeLines(w, txt, 0, indent)
+		p := itemToParagraph(e, item.text, padRight(fmt.Sprintf("%d.", i + 1), maxDigits + 1))
+		renderTTYParagraph(w, p)
 	}
 }
 
-func renderTTYDefinitions(w *writer, e Entry) {
-	const (
-		bullet = "- "
-		sep    = ": "
-	)
-
-	names, values, err := definitionNamesValues(e.definitions)
+func renderTTYDefinitions(w writer, e Entry) {
+	names, err := ttyDefinitionNames(e.definitions)
 	if err != nil {
-		w.err = err
+		w.setErr(err)
 		return
 	}
 
 	maxNameLength := maxLength(names)
-	nameColWidth := maxNameLength + e.indentFirst + len(bullet) + len(sep)
-	valueWidth := e.wrapWidth
-	if valueWidth > 0 {
-		valueWidth -= nameColWidth
-	}
-
-	for i := range names {
+	for i, definition := range e.definitions {
 		if i > 0 {
 			w.write("\n")
 		}
 
-		w.write(timesn(" ", e.indentFirst), bullet, names[i], sep)
-		if valueWidth > 0 {
-			values[i] = wrap(values[i], valueWidth, 0, e.indent)
-		}
-
-		writeLines(
-			w,
-			values[i],
-			maxNameLength-len([]rune(names[i])),
-			nameColWidth+e.indent,
-		)
-	}
-}
-
-func renderTTYNumberedDefinitions(w *writer, e Entry) {
-	const (
-		dot = ". "
-		sep = ": "
+		p := itemToParagraph(
+			e,
+			definition.value,
+			padRight(fmt.Sprintf("- %s:", names[i]), maxNameLength + 3),
 		)
 
-	names, values, err := definitionNamesValues(e.definitions)
+		renderTTYParagraph(w, p)
+	}
+}
+
+func renderTTYNumberedDefinitions(w writer, e Entry) {
+	names, err := ttyDefinitionNames(e.definitions)
 	if err != nil {
-		w.err = err
+		w.setErr(err)
 		return
 	}
 
+	maxNameLength := maxLength(names)
 	maxDigits := numDigits(len(e.definitions))
-	maxNameLength := maxLength(names)
-	nameColWidth := maxNameLength + e.indentFirst + maxDigits + len(dot) + len(sep)
-	valueWidth := e.wrapWidth
-	if valueWidth > 0 {
-		valueWidth -= nameColWidth
-	}
-
-	for i := range names {
+	for i, definition := range e.definitions {
 		if i > 0 {
 			w.write("\n")
 		}
 
-		w.write(timesn(" ", e.indentFirst), padRight(fmt.Sprintf("%d.", i+1), maxDigits+2), names[i], sep)
-		if valueWidth > 0 {
-			values[i] = wrap(values[i], valueWidth, 0, e.indent)
-		}
-
-		writeLines(
-			w,
-			values[i],
-			maxNameLength-len([]rune(names[i])),
-			nameColWidth+e.indent,
+		p := itemToParagraph(
+			e,
+			definition.value,
+			padRight(
+				fmt.Sprintf(
+					"%s %s:",
+					padRight(fmt.Sprintf("%d.", i + 1), maxDigits + 1),
+					names[i],
+				),
+				maxNameLength + maxDigits + 3,
+			),
 		)
+
+		renderTTYParagraph(w, p)
 	}
 }
 
@@ -236,7 +206,7 @@ func ttyCellTexts(rows []TableRow) ([][]string, error) {
 	return cellTexts, nil
 }
 
-func renderTTYTable(w *writer, e Entry) {
+func renderTTYTable(w writer, e Entry) {
 	if len(e.rows) == 0 {
 		return
 	}
@@ -248,7 +218,7 @@ func renderTTYTable(w *writer, e Entry) {
 
 	cellTexts, err := ttyCellTexts(e.rows)
 	if err != nil {
-		w.err = err
+		w.setErr(err)
 	}
 
 	totalSeparatorWidth := (len(cellTexts[0]) - 1) * 3
@@ -321,19 +291,19 @@ func renderTTYTable(w *writer, e Entry) {
 	}
 }
 
-func renderTTYCode(w *writer, e Entry) {
+func renderTTYCode(w writer, e Entry) {
 	e.text.text = escapeTeletype(e.text.text)
 	writeLines(w, e.text.text, e.indent, e.indent)
 }
 
-func renderTTYMultiple(w *writer, s SyntaxItem) {
+func renderTTYMultiple(w writer, s SyntaxItem) {
 	s.topLevel = false
 	s.multiple = false
 	renderTTYSyntaxItem(w, s)
 	w.write("...")
 }
 
-func renderTTYRequired(w *writer, s SyntaxItem) {
+func renderTTYRequired(w writer, s SyntaxItem) {
 	s.delimited = true
 	s.topLevel = false
 	s.required = false
@@ -342,7 +312,7 @@ func renderTTYRequired(w *writer, s SyntaxItem) {
 	w.write(">")
 }
 
-func renderTTYOptional(w *writer, s SyntaxItem) {
+func renderTTYOptional(w writer, s SyntaxItem) {
 	s.delimited = true
 	s.topLevel = false
 	s.optional = false
@@ -351,7 +321,7 @@ func renderTTYOptional(w *writer, s SyntaxItem) {
 	w.write("]")
 }
 
-func renderTTYSequence(w *writer, s SyntaxItem) {
+func renderTTYSequence(w writer, s SyntaxItem) {
 	if !s.delimited && !s.topLevel {
 		w.write("(")
 	}
@@ -370,7 +340,7 @@ func renderTTYSequence(w *writer, s SyntaxItem) {
 	}
 }
 
-func renderTTYChoice(w *writer, s SyntaxItem) {
+func renderTTYChoice(w writer, s SyntaxItem) {
 	if !s.delimited && !s.topLevel {
 		w.write("(")
 	}
@@ -394,11 +364,11 @@ func renderTTYChoice(w *writer, s SyntaxItem) {
 	}
 }
 
-func renderTTYSymbol(w *writer, s SyntaxItem) {
+func renderTTYSymbol(w writer, s SyntaxItem) {
 	w.write(escapeTeletype(s.symbol))
 }
 
-func renderTTYSyntaxItem(w *writer, s SyntaxItem) {
+func renderTTYSyntaxItem(w writer, s SyntaxItem) {
 	switch {
 
 	// foo...
@@ -427,14 +397,14 @@ func renderTTYSyntaxItem(w *writer, s SyntaxItem) {
 	}
 }
 
-func renderTTYSyntax(w *writer, e Entry) {
+func renderTTYSyntax(w writer, e Entry) {
 	s := e.syntax
 	s.topLevel = true
 	renderTTYSyntaxItem(w, s)
 }
 
 func renderTeletype(out io.Writer, d Document) error {
-	w := writer{w: out}
+	w := ttyWriter{w: out}
 	for i, e := range d.entries {
 		if i > 0 {
 			w.write("\n\n")

teletype_test.go

@@ -32,8 +32,8 @@ func TestTeletype(t *testing.T) {
 			textfmt.Wrap(
 				textfmt.Indent(
 					textfmt.Paragraph(textfmt.Text("Below you can find some test text, with various text items.")),
-					8,
 					0,
+					8,
 				),
 				30,
 			),
@@ -47,8 +47,8 @@ func TestTeletype(t *testing.T) {
 					textfmt.ZeroOrMore(textfmt.Symbol("Entry")),
 					textfmt.Symbol(")"),
 				),
-				8,
 				0,
+				8,
 			),
 
 			textfmt.Title(1, "Entries:"),
@@ -234,7 +234,7 @@ Entry explanations:
 			doc := textfmt.Doc(
 				textfmt.Indent(
 					textfmt.Wrap(textfmt.Paragraph(textfmt.Text("Some sample text...\n on  multiple lines.")), 15),
-					4,
+					2,
 					2,
 				),
 			)
@@ -257,7 +257,7 @@ Entry explanations:
 				textfmt.Indent(
 					textfmt.Wrap(textfmt.Paragraph(textfmt.Text("Some sample text...\non multiple lines.")), 15),
 					2,
-					2,
+					0,
 				),
 			)
 
@@ -275,7 +275,7 @@ Entry explanations:
 			doc := textfmt.Doc(
 				textfmt.Indent(
 					textfmt.Wrap(textfmt.Paragraph(textfmt.Text("Some sample text...\non multiple lines.")), 15),
-					4,
+					2,
 					2,
 				),
 			)
@@ -294,8 +294,8 @@ Entry explanations:
 			doc := textfmt.Doc(
 				textfmt.Indent(
 					textfmt.Wrap(textfmt.Paragraph(textfmt.Text("Some sample text...\non multiple lines.")), 15),
-					0,
 					2,
+					-2,
 				),
 			)
 
@@ -365,6 +365,18 @@ Entry explanations:
 				t.Fatal(b.String())
 			}
 		})
+
+		t.Run("newline in link", func(t *testing.T) {
+			var b bytes.Buffer
+			doc := textfmt.Doc(textfmt.Paragraph(textfmt.Link("a\nlink", "https://sqrndfst.org\n/foo")))
+			if err := textfmt.Teletype(&b, doc); err != nil {
+				t.Fatal(err)
+			}
+
+			if b.String() != "a link (https://sqrndfst.org\n/foo)\n" {
+				t.Fatal(b.String())
+			}
+		})
 	})
 
 	t.Run("title", func(t *testing.T) {
@@ -410,7 +422,7 @@ Entry explanations:
 		t.Run("indent without wrapping", func(t *testing.T) {
 			var b bytes.Buffer
 			doc := textfmt.Doc(
-				textfmt.Indent(textfmt.Paragraph(textfmt.Text("This is a paragraph.")), 4, 0),
+				textfmt.Indent(textfmt.Paragraph(textfmt.Text("This is a paragraph.")), 0, 4),
 			)
 
 			if err := textfmt.Teletype(&b, doc); err != nil {
@@ -427,8 +439,8 @@ Entry explanations:
 			doc := textfmt.Doc(
 				textfmt.Indent(
 					textfmt.Wrap(textfmt.Paragraph(textfmt.Text("This is a paragraph.")), 12),
-					4,
 					0,
+					4,
 				),
 			)
 
@@ -446,8 +458,8 @@ Entry explanations:
 			doc := textfmt.Doc(
 				textfmt.Indent(
 					textfmt.Wrap(textfmt.Paragraph(textfmt.Text("This is a paragraph.")), 12),
-					0,
 					4,
+					-4,
 				),
 			)
 
@@ -509,8 +521,7 @@ Entry explanations:
   another
   item
 - this is a
-  third
-  item
+  third item
 `
 
 			if b.String() != expect {
@@ -526,8 +537,8 @@ Entry explanations:
 						textfmt.Item(textfmt.Text("this is another item")),
 						textfmt.Item(textfmt.Text("this is a third item")),
 					),
-					4,
 					0,
+					4,
 				),
 			)
 
@@ -557,8 +568,8 @@ Entry explanations:
 						),
 						18,
 					),
-					4,
 					-2,
+					6,
 				),
 			)
 
@@ -591,8 +602,8 @@ third item
 						),
 						18,
 					),
-					0,
 					2,
+					-2,
 				),
 			)
 
@@ -659,11 +670,9 @@ third item
 			const expect = `1. this is an
    item
 2. this is
-   another
-   item
+   another item
 3. this is a
-   third
-   item
+   third item
 `
 
 			if b.String() != expect {
@@ -679,8 +688,8 @@ third item
 						textfmt.Item(textfmt.Text("this is another item")),
 						textfmt.Item(textfmt.Text("this is a third item")),
 					),
-					4,
 					0,
+					4,
 				),
 			)
 
@@ -710,8 +719,8 @@ third item
 						),
 						21,
 					),
-					4,
 					-3,
+					7,
 				),
 			)
 
@@ -744,8 +753,8 @@ third item
 						),
 						21,
 					),
-					0,
 					3,
+					-3,
 				),
 			)
 
@@ -871,8 +880,8 @@ third item
 						textfmt.Definition(textfmt.Text("green"), textfmt.Text("looks like grass")),
 						textfmt.Definition(textfmt.Text("blue"), textfmt.Text("looks like sky")),
 					),
-					4,
 					0,
+					4,
 				),
 			)
 
@@ -902,8 +911,8 @@ third item
 						),
 						21,
 					),
-					3,
-					-9,
+					-6,
+					9,
 				),
 			)
 
@@ -912,7 +921,8 @@ third item
 				t.Fatal(err)
 			}
 
-			const expect = `   - red:   looks
+			const expect = `
+   - red:   looks
    like strawberry
    - green: looks
    like grass
@@ -920,8 +930,8 @@ third item
    like sky
 `
 
-			if b.String() != expect {
-				t.Fatal(b.String())
+			if "\n" + b.String() != expect {
+				t.Fatal("\n" + b.String())
 			}
 		})
 
@@ -936,8 +946,8 @@ third item
 						),
 						21,
 					),
-					0,
 					4,
+					-4,
 				),
 			)
 
@@ -946,7 +956,8 @@ third item
 				t.Fatal(err)
 			}
 
-			const expect = `- red:   looks like
+			const expect = `
+- red:   looks like
              strawberry
 - green: looks like
              grass
@@ -954,8 +965,8 @@ third item
              sky
 `
 
-			if b.String() != expect {
-				t.Fatal(b.String())
+			if "\n" + b.String() != expect {
+				t.Fatal("\n" + b.String())
 			}
 		})
 	})
@@ -1022,8 +1033,8 @@ third item
 						textfmt.Definition(textfmt.Text("green"), textfmt.Text("looks like grass")),
 						textfmt.Definition(textfmt.Text("blue"), textfmt.Text("looks like sky")),
 					),
-					4,
 					0,
+					4,
 				),
 			)
 
@@ -1053,8 +1064,8 @@ third item
 						),
 						21,
 					),
-					3,
-					-9,
+					-6,
+					9,
 				),
 			)
 
@@ -1063,7 +1074,8 @@ third item
 				t.Fatal(err)
 			}
 
-			const expect = `   1. red:   looks
+			const expect = `
+   1. red:   looks
     like strawberry
    2. green: looks
     like grass
@@ -1071,8 +1083,8 @@ third item
     like sky
 `
 
-			if b.String() != expect {
-				t.Fatal(b.String())
+			if "\n" + b.String() != expect {
+				t.Fatal("\n" + b.String())
 			}
 		})
 
@@ -1087,8 +1099,8 @@ third item
 						),
 						21,
 					),
-					0,
 					4,
+					-4,
 				),
 			)
 
@@ -1097,7 +1109,8 @@ third item
 				t.Fatal(err)
 			}
 
-			const expect = `1. red:   looks like
+			const expect = `
+1. red:   looks like
               strawberry
 2. green: looks like
               grass
@@ -1105,8 +1118,8 @@ third item
               sky
 `
 
-			if b.String() != expect {
-				t.Fatal(b.String())
+			if "\n" + b.String() != expect {
+				t.Fatal("\n" + b.String())
 			}
 		})
 
@@ -1556,8 +1569,8 @@ Walking through the mixed forests of Brandenburg in early autumn, one notices th
 							textfmt.Cell(textfmt.Text("and shadow on the forest floor")),
 						),
 					),
-					0,
 					4,
+					0,
 				),
 			)
 
@@ -1652,8 +1665,8 @@ and silver birch     | their canopies creating  | and shadow on the
 						),
 						72,
 					),
-					0,
 					4,
+					0,
 				),
 			)
 
@@ -1683,6 +1696,7 @@ and silver birch     | their canopies creating  | and shadow on the
 	})
 
 	t.Run("code", func(t *testing.T) {
+		t.Run("unindented", func(t *testing.T) {
 			const code = `func() textfmt.Document {
 	return textfmt.Document(
 		textfmt.Paragraph(textfmt.Text("Hello, world!")),
@@ -1699,6 +1713,48 @@ and silver birch     | their canopies creating  | and shadow on the
 			}
 		})
 
+		t.Run("indented", func(t *testing.T) {
+			const code = `func() textfmt.Document {
+	return textfmt.Document(
+		textfmt.Paragraph(textfmt.Text("Hello, world!")),
+	)
+}`
+
+			var b bytes.Buffer
+			if err := textfmt.Teletype(&b, textfmt.Doc(textfmt.Indent(textfmt.CodeBlock(code), 4, 0))); err != nil {
+				t.Fatal(err)
+			}
+
+			const expect = `    func() textfmt.Document {
+    	return textfmt.Document(
+    		textfmt.Paragraph(textfmt.Text("Hello, world!")),
+    	)
+    }
+`
+
+			if b.String() != expect {
+				t.Fatal(b.String())
+			}
+		})
+
+		t.Run("wrap has no effect", func(t *testing.T) {
+			const code = `func() textfmt.Document {
+	return textfmt.Document(
+		textfmt.Paragraph(textfmt.Text("Hello, world!")),
+	)
+}`
+
+			var b bytes.Buffer
+			if err := textfmt.Teletype(&b, textfmt.Doc(textfmt.Wrap(textfmt.CodeBlock(code), 12))); err != nil {
+				t.Fatal(err)
+			}
+
+			if b.String() != code+"\n" {
+				t.Fatal(b.String())
+			}
+		})
+	})
+
 	t.Run("syntax", func(t *testing.T) {
 		t.Run("symbol", func(t *testing.T) {
 			doc := textfmt.Doc(textfmt.Syntax(textfmt.Symbol("foo")))

text.go

@@ -1,12 +1,20 @@
 package textfmt
 
-import "strings"
+import (
+	"strings"
+	"unicode"
+)
 
 func timesn(s string, n int) string {
+	if n < 0 {
+		return ""
+	}
+
 	ss := make([]string, n+1)
 	return strings.Join(ss, s)
 }
 
+// non-negative numbers only
 func numDigits(n int) int {
 	if n == 0 {
 		return 1
@@ -33,19 +41,26 @@ func maxLength(names []string) int {
 }
 
 func padRight(s string, n int) string {
-	if len(s) >= n {
+	if len([]rune(s)) >= n {
 		return s
 	}
 
 	n -= len([]rune(s))
-	return s + timesn(" ", n)
+	return s + timesn("\u00a0", n)
+}
+
+func trim(s string) string {
+	return strings.TrimFunc(
+		s,
+		func(r rune) bool { return r != '\u00a0' && unicode.IsSpace(r) },
+	)
 }
 
 func singleLine(text string) string {
 	var l []string
 	p := strings.Split(text, "\n")
 	for _, part := range p {
-		part = strings.TrimSpace(part)
+		part = trim(part)
 		if part == "" {
 			continue
 		}
@@ -56,19 +71,27 @@ func singleLine(text string) string {
 	return strings.Join(l, " ")
 }
 
-func writeLines(w *writer, txt string, indentFirst, indent int) {
-	lines := strings.Split(txt, "\n")
-	for i, l := range lines {
-		if i > 0 {
-			w.write("\n")
+func textToString(t Txt) string {
+	if len(t.cat) == 0 && t.link == "" {
+		return trim(t.text)
 	}
 
-		ind := indentFirst
-		if i > 0 {
-			ind = indent
+	if len(t.cat) == 0 && t.text == "" {
+		return trim(t.link)
 	}
 
-		w.write(timesn(" ", ind))
-		w.write(l)
+	if len(t.cat) == 0 {
+		return fmt.Sprintf("%s (%s)", t.text, t.link)
 	}
+
+	b := bytes.NewBuffer(nil)
+	for i := range t.cat {
+		if i > 0 {
+			b.WriteRune(' ')
+		}
+
+		b.WriteString(textToString(t.cat[i]))
+	}
+
+	return singleLine(b.String())
 }

wrap.go

@@ -27,7 +27,7 @@ func wrap(text string, width, firstIndent, restIndent int) string {
 	for _, w := range words {
 		if len(currentLine) == 0 {
 			currentLine = []string{w}
-			lineLen = len(w)
+			lineLen = len([]rune(w))
 			continue
 		}
 
@@ -36,15 +36,15 @@ func wrap(text string, width, firstIndent, restIndent int) string {
 			maxw = width - firstIndent
 		}
 
-		if lineLen+1+len(w) > maxw {
+		if lineLen+1+len([]rune(w)) > maxw {
 			lines = append(lines, strings.Join(currentLine, " "))
 			currentLine = []string{w}
-			lineLen = len(w)
+			lineLen = len([]rune(w))
 			continue
 		}
 
 		currentLine = append(currentLine, w)
-		lineLen += 1 + len(w)
+		lineLen += 1 + len([]rune(w))
 	}
 
 	lines = append(lines, strings.Join(currentLine, " "))

write.go

@@ -0,0 +1,104 @@
+package textfmt
+
+import (
+	"io"
+	"fmt"
+	"strings"
+)
+
+type writer interface {
+	write(...any)
+	error() error
+	setErr(error)
+}
+
+type ttyWriter struct {
+	w   io.Writer
+	internal bool
+	err error
+}
+
+type roffWriter struct {
+	w *bufio.Writer
+	internal bool
+	err error
+}
+
+func (w *ttyWriter) write(a ...any) {
+	for _, ai := range a {
+		if w.err != nil {
+			return
+		}
+
+		s := fmt.Sprint(ai)
+		r := []rune(s)
+		if !w.internal {
+			for i := range r {
+				if r[i] == '\u00a0' {
+					r[i] = ' '
+				}
+			}
+		}
+
+		if _, err := w.w.Write([]byte(string(r))); err != nil {
+			w.err = err
+		}
+	}
+}
+
+func (w *ttyWriter) error() error {
+	return w.err
+}
+
+func (w *ttyWriter) setErr(err error) {
+	w.err = err
+}
+
+func (w *roffWriter) write(a ...any) {
+	for _, ai := range a {
+		if w.err != nil {
+			return
+		}
+
+		var rr []rune
+		s := fmt.Sprint(ai)
+		r := []rune(s)
+		for i := range r {
+			if r[i] == '\u00a0' {
+				rr = append(rr, []rune("\\~")...)
+				continue
+			}
+
+			rr = append(rr, r[i])
+		}
+
+		if _, err := w.w.Write([]byte(string(rr))); err != nil {
+			w.err = err
+		}
+	}
+}
+
+func (w *roffWriter) error() error {
+	return w.err
+}
+
+func (w *roffWriter) setErr(err error) {
+	w.err = err
+}
+
+func writeLines(w writer, txt string, indentFirst, indentRest int) {
+	lines := strings.Split(txt, "\n")
+	for i, l := range lines {
+		if i > 0 {
+			w.write("\n")
+		}
+
+		indent := indentFirst
+		if i > 0 {
+			indent = indentRest
+		}
+
+		w.write(timesn(" ", indent))
+		w.write(l)
+	}
+}

writer.go

@@ -1,20 +0,0 @@
-package textfmt
-
-import "io"
-
-type writer struct {
-	w   io.Writer
-	err error
-}
-
-func (w *writer) write(s ...string) {
-	for _, si := range s {
-		if w.err != nil {
-			return
-		}
-
-		if _, err := w.w.Write([]byte(si)); err != nil {
-			w.err = err
-		}
-	}
-}