gitea-tea/vendor/github.com/charmbracelet/glamour/glamour.go

246 lines
6.2 KiB
Go

package glamour
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"github.com/muesli/termenv"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/extension"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/util"
"github.com/charmbracelet/glamour/ansi"
)
// A TermRendererOption sets an option on a TermRenderer.
type TermRendererOption func(*TermRenderer) error
// TermRenderer can be used to render markdown content, posing a depth of
// customization and styles to fit your needs.
type TermRenderer struct {
md goldmark.Markdown
ansiOptions ansi.Options
buf bytes.Buffer
renderBuf bytes.Buffer
}
// Render initializes a new TermRenderer and renders a markdown with a specific
// style.
func Render(in string, stylePath string) (string, error) {
b, err := RenderBytes([]byte(in), stylePath)
return string(b), err
}
// RenderWithEnvironmentConfig initializes a new TermRenderer and renders a
// markdown with a specific style defined by the GLAMOUR_STYLE environment variable.
func RenderWithEnvironmentConfig(in string) (string, error) {
b, err := RenderBytes([]byte(in), getEnvironmentStyle())
return string(b), err
}
// RenderBytes initializes a new TermRenderer and renders a markdown with a
// specific style.
func RenderBytes(in []byte, stylePath string) ([]byte, error) {
r, err := NewTermRenderer(
WithStylePath(stylePath),
)
if err != nil {
return nil, err
}
return r.RenderBytes(in)
}
// NewTermRenderer returns a new TermRenderer the given options.
func NewTermRenderer(options ...TermRendererOption) (*TermRenderer, error) {
tr := &TermRenderer{
md: goldmark.New(
goldmark.WithExtensions(
extension.GFM,
extension.DefinitionList,
),
goldmark.WithParserOptions(
parser.WithAutoHeadingID(),
),
),
ansiOptions: ansi.Options{
WordWrap: 80,
ColorProfile: termenv.TrueColor,
},
}
for _, o := range options {
if err := o(tr); err != nil {
return nil, err
}
}
ar := ansi.NewRenderer(tr.ansiOptions)
tr.md.SetRenderer(
renderer.NewRenderer(
renderer.WithNodeRenderers(
util.Prioritized(ar, 1000),
),
),
)
return tr, nil
}
// WithBaseURL sets a TermRenderer's base URL.
func WithBaseURL(baseURL string) TermRendererOption {
return func(tr *TermRenderer) error {
tr.ansiOptions.BaseURL = baseURL
return nil
}
}
// WithColorProfile sets the TermRenderer's color profile
// (TrueColor / ANSI256 / ANSI).
func WithColorProfile(profile termenv.Profile) TermRendererOption {
return func(tr *TermRenderer) error {
tr.ansiOptions.ColorProfile = profile
return nil
}
}
// WithStandardStyle sets a TermRenderer's styles with a standard (builtin)
// style.
func WithStandardStyle(style string) TermRendererOption {
return func(tr *TermRenderer) error {
styles, err := getDefaultStyle(style)
if err != nil {
return err
}
tr.ansiOptions.Styles = *styles
return nil
}
}
// WithAutoStyle sets a TermRenderer's styles with either the standard dark
// or light style, depending on the terminal's background color at run-time.
func WithAutoStyle() TermRendererOption {
return WithStandardStyle("auto")
}
// WithEnvironmentConfig sets a TermRenderer's styles based on the
// GLAMOUR_STYLE environment variable.
func WithEnvironmentConfig() TermRendererOption {
return WithStylePath(getEnvironmentStyle())
}
// WithStylePath sets a TermRenderer's style from stylePath. stylePath is first
// interpreted as a filename. If no such file exists, it is re-interpreted as a
// standard style.
func WithStylePath(stylePath string) TermRendererOption {
return func(tr *TermRenderer) error {
jsonBytes, err := ioutil.ReadFile(stylePath)
switch {
case err == nil:
return json.Unmarshal(jsonBytes, &tr.ansiOptions.Styles)
case os.IsNotExist(err):
styles, err := getDefaultStyle(stylePath)
if err != nil {
return err
}
tr.ansiOptions.Styles = *styles
return nil
default:
return err
}
}
}
// WithStyles sets a TermRenderer's styles.
func WithStyles(styles ansi.StyleConfig) TermRendererOption {
return func(tr *TermRenderer) error {
tr.ansiOptions.Styles = styles
return nil
}
}
// WithStylesFromJSONBytes sets a TermRenderer's styles by parsing styles from
// jsonBytes.
func WithStylesFromJSONBytes(jsonBytes []byte) TermRendererOption {
return func(tr *TermRenderer) error {
return json.Unmarshal(jsonBytes, &tr.ansiOptions.Styles)
}
}
// WithStylesFromJSONFile sets a TermRenderer's styles from a JSON file.
func WithStylesFromJSONFile(filename string) TermRendererOption {
return func(tr *TermRenderer) error {
jsonBytes, err := ioutil.ReadFile(filename)
if err != nil {
return err
}
return json.Unmarshal(jsonBytes, &tr.ansiOptions.Styles)
}
}
// WithWordWrap sets a TermRenderer's word wrap.
func WithWordWrap(wordWrap int) TermRendererOption {
return func(tr *TermRenderer) error {
tr.ansiOptions.WordWrap = wordWrap
return nil
}
}
func (tr *TermRenderer) Read(b []byte) (int, error) {
return tr.renderBuf.Read(b)
}
func (tr *TermRenderer) Write(b []byte) (int, error) {
return tr.buf.Write(b)
}
// Close must be called after writing to TermRenderer. You can then retrieve
// the rendered markdown by calling Read.
func (tr *TermRenderer) Close() error {
err := tr.md.Convert(tr.buf.Bytes(), &tr.renderBuf)
if err != nil {
return err
}
tr.buf.Reset()
return nil
}
// Render returns the markdown rendered into a string.
func (tr *TermRenderer) Render(in string) (string, error) {
b, err := tr.RenderBytes([]byte(in))
return string(b), err
}
// RenderBytes returns the markdown rendered into a byte slice.
func (tr *TermRenderer) RenderBytes(in []byte) ([]byte, error) {
var buf bytes.Buffer
err := tr.md.Convert(in, &buf)
return buf.Bytes(), err
}
func getEnvironmentStyle() string {
glamourStyle := os.Getenv("GLAMOUR_STYLE")
if len(glamourStyle) == 0 {
glamourStyle = "auto"
}
return glamourStyle
}
func getDefaultStyle(style string) (*ansi.StyleConfig, error) {
if style == "auto" {
if termenv.HasDarkBackground() {
return &DarkStyleConfig, nil
}
return &LightStyleConfig, nil
}
styles, ok := DefaultStyles[style]
if !ok {
return nil, fmt.Errorf("%s: style not found", style)
}
return styles, nil
}