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package highlight
import (
"fmt"
"io"
"path/filepath"
"strings"
"sync"
"github.com/alecthomas/chroma/v2"
"github.com/alecthomas/chroma/v2/lexers"
"github.com/alecthomas/chroma/v2/styles"
"github.com/kovidgoyal/go-parallel"
"github.com/kovidgoyal/kitty/tools/utils"
)
var _ = fmt.Print
var default_style = sync.OnceValue(func() *chroma.Style {
// Default style generated by python style.py default pygments.styles.default.DefaultStyle
// with https://raw.githubusercontent.com/alecthomas/chroma/master/_tools/style.py
return styles.Register(chroma.MustNewStyle("default", chroma.StyleEntries{
chroma.TextWhitespace: "#bbbbbb",
chroma.Comment: "italic #3D7B7B",
chroma.CommentPreproc: "noitalic #9C6500",
chroma.Keyword: "bold #008000",
chroma.KeywordPseudo: "nobold",
chroma.KeywordType: "nobold #B00040",
chroma.Operator: "#666666",
chroma.OperatorWord: "bold #AA22FF",
chroma.NameBuiltin: "#008000",
chroma.NameFunction: "#0000FF",
chroma.NameClass: "bold #0000FF",
chroma.NameNamespace: "bold #0000FF",
chroma.NameException: "bold #CB3F38",
chroma.NameVariable: "#19177C",
chroma.NameConstant: "#880000",
chroma.NameLabel: "#767600",
chroma.NameEntity: "bold #717171",
chroma.NameAttribute: "#687822",
chroma.NameTag: "bold #008000",
chroma.NameDecorator: "#AA22FF",
chroma.LiteralString: "#BA2121",
chroma.LiteralStringDoc: "italic",
chroma.LiteralStringInterpol: "bold #A45A77",
chroma.LiteralStringEscape: "bold #AA5D1F",
chroma.LiteralStringRegex: "#A45A77",
chroma.LiteralStringSymbol: "#19177C",
chroma.LiteralStringOther: "#008000",
chroma.LiteralNumber: "#666666",
chroma.GenericHeading: "bold #000080",
chroma.GenericSubheading: "bold #800080",
chroma.GenericDeleted: "#A00000",
chroma.GenericInserted: "#008400",
chroma.GenericError: "#E40000",
chroma.GenericEmph: "italic",
chroma.GenericStrong: "bold",
chroma.GenericPrompt: "bold #000080",
chroma.GenericOutput: "#717171",
chroma.GenericTraceback: "#04D",
chroma.Error: "border:#FF0000",
chroma.Background: " bg:#f8f8f8",
}))
})
// Clear the background colour.
func clear_background(style *chroma.Style) *chroma.Style {
builder := style.Builder()
bg := builder.Get(chroma.Background)
bg.Background = 0
bg.NoInherit = true
builder.AddEntry(chroma.Background, bg)
style, _ = builder.Build()
return style
}
func ansi_formatter(w io.Writer, style *chroma.Style, sanitize func(string) string, it chroma.Iterator) (err error) {
const SGR_PREFIX = "\033["
const SGR_SUFFIX = "m"
style = clear_background(style)
before, after := make([]byte, 0, 64), make([]byte, 0, 64)
nl := []byte{'\n'}
write_sgr := func(which []byte) (err error) {
if len(which) > 1 {
if _, err = w.Write(utils.UnsafeStringToBytes(SGR_PREFIX)); err != nil {
return err
}
if _, err = w.Write(which[:len(which)-1]); err != nil {
return err
}
if _, err = w.Write(utils.UnsafeStringToBytes(SGR_SUFFIX)); err != nil {
return err
}
}
return
}
write := func(text string) (err error) {
if err = write_sgr(before); err != nil {
return err
}
if _, err = w.Write(utils.UnsafeStringToBytes(text)); err != nil {
return err
}
if err = write_sgr(after); err != nil {
return err
}
return
}
for token := it(); token != chroma.EOF; token = it() {
entry := style.Get(token.Type)
before, after = before[:0], after[:0]
if !entry.IsZero() {
if entry.Bold == chroma.Yes {
before = append(before, '1', ';')
after = append(after, '2', '2', '1', ';')
}
if entry.Underline == chroma.Yes {
before = append(before, '4', ';')
after = append(after, '2', '4', ';')
}
if entry.Italic == chroma.Yes {
before = append(before, '3', ';')
after = append(after, '2', '3', ';')
}
if entry.Colour.IsSet() {
before = append(before, fmt.Sprintf("38:2:%d:%d:%d;", entry.Colour.Red(), entry.Colour.Green(), entry.Colour.Blue())...)
after = append(after, '3', '9', ';')
}
}
// independently format each line in a multiline token, needed for the diff kitten highlighting to work, also
// pagers like less reset SGR formatting at line boundaries
text := sanitize(token.Value)
for text != "" {
idx := strings.IndexByte(text, '\n')
if idx < 0 {
if err = write(text); err != nil {
return err
}
break
}
if err = write(text[:idx]); err != nil {
return err
}
if _, err = w.Write(nl); err != nil {
return err
}
text = text[idx+1:]
}
}
return nil
}
func resolved_chroma_style(srd StyleResolveData) *chroma.Style {
name := srd.StyleName()
var style *chroma.Style
if name == "default" {
style = default_style()
} else {
style = styles.Get(name)
}
if style == nil {
if srd.UseLightColors() {
style = default_style()
} else {
style = styles.Get("monokai")
if style == nil {
style = styles.Get("github-dark")
}
}
if style == nil {
style = styles.Fallback
}
}
return style
}
type highlighter struct {
tokens_map map[string][]chroma.Token
lock sync.Mutex
sanitize func(string) string
}
func (h *highlighter) Sanitize(x string) string { return h.sanitize(x) }
func (h *highlighter) HighlightFile(path string, srd StyleResolveData) (highlighted_string string, err error) {
defer func() {
if r := recover(); r != nil {
err = parallel.Format_stacktrace_on_panic(r, 1)
}
}()
filename_for_detection := filepath.Base(path)
ext := filepath.Ext(filename_for_detection)
if ext != "" {
ext = strings.ToLower(ext[1:])
r := srd.SyntaxAliases()[ext]
if r != "" {
filename_for_detection = "file." + r
}
}
text, err := srd.TextForPath(path)
if err != nil {
return "", err
}
h.lock.Lock()
tokens := h.tokens_map[path]
h.lock.Unlock()
if tokens == nil {
lexer := lexers.Match(filename_for_detection)
if lexer == nil {
lexer = lexers.Analyse(text)
}
if lexer == nil {
return "", fmt.Errorf("Cannot highlight %#v: %w", path, ErrNoLexer)
}
lexer = chroma.Coalesce(lexer)
iterator, err := lexer.Tokenise(nil, text)
if err != nil {
return "", err
}
tokens = iterator.Tokens()
h.lock.Lock()
h.tokens_map[path] = tokens
h.lock.Unlock()
}
w := strings.Builder{}
w.Grow(len(text) * 2)
err = ansi_formatter(&w, resolved_chroma_style(srd), h.sanitize, chroma.Literator(tokens...))
return w.String(), err
}
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