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package ansi
import (
"io"
"net/url"
"strings"
"github.com/muesli/termenv"
east "github.com/yuin/goldmark-emoji/ast"
"github.com/yuin/goldmark/ast"
astext "github.com/yuin/goldmark/extension/ast"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/util"
)
// Options is used to configure an ANSIRenderer.
type Options struct {
BaseURL string
WordWrap int
PreserveNewLines bool
ColorProfile termenv.Profile
Styles StyleConfig
}
// ANSIRenderer renders markdown content as ANSI escaped sequences.
type ANSIRenderer struct {
context RenderContext
}
// NewRenderer returns a new ANSIRenderer with style and options set.
func NewRenderer(options Options) *ANSIRenderer {
return &ANSIRenderer{
context: NewRenderContext(options),
}
}
// RegisterFuncs implements NodeRenderer.RegisterFuncs.
func (r *ANSIRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
// blocks
reg.Register(ast.KindDocument, r.renderNode)
reg.Register(ast.KindHeading, r.renderNode)
reg.Register(ast.KindBlockquote, r.renderNode)
reg.Register(ast.KindCodeBlock, r.renderNode)
reg.Register(ast.KindFencedCodeBlock, r.renderNode)
reg.Register(ast.KindHTMLBlock, r.renderNode)
reg.Register(ast.KindList, r.renderNode)
reg.Register(ast.KindListItem, r.renderNode)
reg.Register(ast.KindParagraph, r.renderNode)
reg.Register(ast.KindTextBlock, r.renderNode)
reg.Register(ast.KindThematicBreak, r.renderNode)
// inlines
reg.Register(ast.KindAutoLink, r.renderNode)
reg.Register(ast.KindCodeSpan, r.renderNode)
reg.Register(ast.KindEmphasis, r.renderNode)
reg.Register(ast.KindImage, r.renderNode)
reg.Register(ast.KindLink, r.renderNode)
reg.Register(ast.KindRawHTML, r.renderNode)
reg.Register(ast.KindText, r.renderNode)
reg.Register(ast.KindString, r.renderNode)
// tables
reg.Register(astext.KindTable, r.renderNode)
reg.Register(astext.KindTableHeader, r.renderNode)
reg.Register(astext.KindTableRow, r.renderNode)
reg.Register(astext.KindTableCell, r.renderNode)
// definitions
reg.Register(astext.KindDefinitionList, r.renderNode)
reg.Register(astext.KindDefinitionTerm, r.renderNode)
reg.Register(astext.KindDefinitionDescription, r.renderNode)
// footnotes
reg.Register(astext.KindFootnote, r.renderNode)
reg.Register(astext.KindFootnoteList, r.renderNode)
reg.Register(astext.KindFootnoteLink, r.renderNode)
reg.Register(astext.KindFootnoteBacklink, r.renderNode)
// checkboxes
reg.Register(astext.KindTaskCheckBox, r.renderNode)
// strikethrough
reg.Register(astext.KindStrikethrough, r.renderNode)
// emoji
reg.Register(east.KindEmoji, r.renderNode)
}
func (r *ANSIRenderer) renderNode(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
// _, _ = w.Write([]byte(node.Type.String()))
writeTo := io.Writer(w)
bs := r.context.blockStack
// children get rendered by their parent
if isChild(node) {
return ast.WalkContinue, nil
}
e := r.NewElement(node, source)
if entering {
// everything below the Document element gets rendered into a block buffer
if bs.Len() > 0 {
writeTo = io.Writer(bs.Current().Block)
}
_, _ = io.WriteString(writeTo, e.Entering)
if e.Renderer != nil {
err := e.Renderer.Render(writeTo, r.context)
if err != nil {
return ast.WalkStop, err
}
}
} else {
// everything below the Document element gets rendered into a block buffer
if bs.Len() > 0 {
writeTo = io.Writer(bs.Parent().Block)
}
// if we're finished rendering the entire document,
// flush to the real writer
if node.Type() == ast.TypeDocument {
writeTo = w
}
if e.Finisher != nil {
err := e.Finisher.Finish(writeTo, r.context)
if err != nil {
return ast.WalkStop, err
}
}
_, _ = io.WriteString(bs.Current().Block, e.Exiting)
}
return ast.WalkContinue, nil
}
func isChild(node ast.Node) bool {
for n := node.Parent(); n != nil; n = n.Parent() {
// These types are already rendered by their parent
switch n.Kind() {
case ast.KindCodeSpan, ast.KindAutoLink, ast.KindLink, ast.KindImage, ast.KindEmphasis, astext.KindStrikethrough, astext.KindTableCell:
return true
}
}
return false
}
func resolveRelativeURL(baseURL string, rel string) string {
u, err := url.Parse(rel)
if err != nil {
return rel
}
if u.IsAbs() {
return rel
}
u.Path = strings.TrimPrefix(u.Path, "/")
base, err := url.Parse(baseURL)
if err != nil {
return rel
}
return base.ResolveReference(u).String()
}
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