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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"os"
"os/signal"
"runtime"
"runtime/pprof"
"sort"
"strconv"
"strings"
"github.com/mattn/go-colorable"
"github.com/mattn/go-isatty"
"gopkg.in/alecthomas/kingpin.v3-unstable"
"github.com/alecthomas/chroma"
"github.com/alecthomas/chroma/formatters"
"github.com/alecthomas/chroma/formatters/html"
"github.com/alecthomas/chroma/lexers"
"github.com/alecthomas/chroma/styles"
)
var (
// Populated by goreleaser.
version = "?"
commit = "?"
date = "?"
profileFlag = kingpin.Flag("profile", "Enable profiling to file.").Hidden().String()
listFlag = kingpin.Flag("list", "List lexers, styles and formatters.").Bool()
unbufferedFlag = kingpin.Flag("unbuffered", "Do not buffer output.").Bool()
traceFlag = kingpin.Flag("trace", "Trace lexer states as they are traversed.").Bool()
lexerFlag = kingpin.Flag("lexer", "Lexer to use when formatting.").PlaceHolder("autodetect").Short('l').Enum(lexers.Names(true)...)
styleFlag = kingpin.Flag("style", "Style to use for formatting.").Short('s').Default("swapoff").Enum(styles.Names()...)
formatterFlag = kingpin.Flag("formatter", "Formatter to use.").Default("terminal").Short('f').Enum(formatters.Names()...)
htmlFlag = kingpin.Flag("html", "Enable HTML mode (equivalent to '--formatter html').").Bool()
htmlPrefixFlag = kingpin.Flag("html-prefix", "HTML CSS class prefix.").PlaceHolder("PREFIX").String()
htmlStylesFlag = kingpin.Flag("html-styles", "Output HTML CSS styles.").Bool()
htmlOnlyFlag = kingpin.Flag("html-only", "Output HTML fragment.").Bool()
htmlInlineStyleFlag = kingpin.Flag("html-inline-styles", "Output HTML with inline styles (no classes).").Bool()
htmlTabWidthFlag = kingpin.Flag("html-tab-width", "Set the HTML tab width.").Default("8").Int()
htmlLinesFlag = kingpin.Flag("html-lines", "Include line numbers in output.").Bool()
htmlLinesStyleFlag = kingpin.Flag("html-lines-style", "Style for line numbers.").String()
htmlHighlightFlag = kingpin.Flag("html-highlight", "Highlight these lines.").PlaceHolder("N[:M][,...]").String()
htmlHighlightStyleFlag = kingpin.Flag("html-highlight-style", "Style used for highlighting lines.").String()
htmlBaseLineFlag = kingpin.Flag("html-base-line", "Base line number.").Default("1").Int()
filesArgs = kingpin.Arg("files", "Files to highlight.").ExistingFiles()
)
type flushableWriter interface {
io.Writer
Flush() error
}
type nopFlushableWriter struct{ io.Writer }
func (n *nopFlushableWriter) Flush() error { return nil }
func main() {
kingpin.CommandLine.Version(fmt.Sprintf("%s-%s-%s", version, commit, date))
kingpin.CommandLine.Help = `
Chroma is a general purpose syntax highlighting library and corresponding
command, for Go.
`
kingpin.Parse()
if *listFlag {
listAll()
return
}
if *profileFlag != "" {
f, err := os.Create(*profileFlag)
kingpin.FatalIfError(err, "")
pprof.StartCPUProfile(f)
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt)
go func() {
<-signals
pprof.StopCPUProfile()
os.Exit(128 + 3)
}()
defer pprof.StopCPUProfile()
}
var out io.Writer = os.Stdout
if runtime.GOOS == "windows" && isatty.IsTerminal(os.Stdout.Fd()) {
out = colorable.NewColorableStdout()
}
var w flushableWriter
if *unbufferedFlag {
w = &nopFlushableWriter{out}
} else {
w = bufio.NewWriterSize(out, 16384)
}
defer w.Flush()
if *htmlFlag {
*formatterFlag = "html"
}
// Retrieve user-specified style, clone it, and add some overrides.
builder := styles.Get(*styleFlag).Builder()
if *htmlHighlightStyleFlag != "" {
builder.Add(chroma.LineHighlight, *htmlHighlightStyleFlag)
}
if *htmlLinesStyleFlag != "" {
builder.Add(chroma.LineNumbers, *htmlLinesStyleFlag)
}
style, err := builder.Build()
kingpin.FatalIfError(err, "")
if *formatterFlag == "html" {
options := []html.Option{
html.TabWidth(*htmlTabWidthFlag),
html.BaseLineNumber(*htmlBaseLineFlag),
}
if *htmlPrefixFlag != "" {
options = append(options, html.ClassPrefix(*htmlPrefixFlag))
}
// Dump styles.
if *htmlStylesFlag {
formatter := html.New(html.WithClasses())
formatter.WriteCSS(w, style)
return
}
if !*htmlInlineStyleFlag {
options = append(options, html.WithClasses())
}
if !*htmlOnlyFlag {
options = append(options, html.Standalone())
}
if *htmlLinesFlag {
options = append(options, html.WithLineNumbers())
}
if len(*htmlHighlightFlag) > 0 {
ranges := [][2]int{}
for _, span := range strings.Split(*htmlHighlightFlag, ",") {
parts := strings.Split(span, ":")
if len(parts) > 2 {
kingpin.Fatalf("range should be N[:M], not %q", span)
}
start, err := strconv.ParseInt(parts[0], 10, 64)
kingpin.FatalIfError(err, "min value of range should be integer not %q", parts[0])
end := start
if len(parts) == 2 {
end, err = strconv.ParseInt(parts[1], 10, 64)
kingpin.FatalIfError(err, "max value of range should be integer not %q", parts[1])
}
ranges = append(ranges, [2]int{int(start), int(end)})
}
options = append(options, html.HighlightLines(ranges))
}
formatters.Register("html", html.New(options...))
}
if len(*filesArgs) == 0 {
contents, err := ioutil.ReadAll(os.Stdin)
kingpin.FatalIfError(err, "")
format(w, style, lex("", string(contents)))
} else {
for _, filename := range *filesArgs {
contents, err := ioutil.ReadFile(filename)
kingpin.FatalIfError(err, "")
format(w, style, lex(filename, string(contents)))
}
}
}
func listAll() {
fmt.Println("lexers:")
sort.Sort(lexers.Registry.Lexers)
for _, l := range lexers.Registry.Lexers {
config := l.Config()
fmt.Printf(" %s\n", config.Name)
filenames := []string{}
filenames = append(filenames, config.Filenames...)
filenames = append(filenames, config.AliasFilenames...)
if len(config.Aliases) > 0 {
fmt.Printf(" aliases: %s\n", strings.Join(config.Aliases, " "))
}
if len(filenames) > 0 {
fmt.Printf(" filenames: %s\n", strings.Join(filenames, " "))
}
if len(config.MimeTypes) > 0 {
fmt.Printf(" mimetypes: %s\n", strings.Join(config.MimeTypes, " "))
}
}
fmt.Println()
fmt.Printf("styles:")
for name := range styles.Registry {
fmt.Printf(" %s", name)
}
fmt.Println()
fmt.Printf("formatters:")
for name := range formatters.Registry {
fmt.Printf(" %s", name)
}
fmt.Println()
}
func lex(path string, contents string) chroma.Iterator {
lexer := selexer(path, contents)
if lexer == nil {
lexer = lexers.Fallback
}
if rel, ok := lexer.(*chroma.RegexLexer); ok {
rel.Trace(*traceFlag)
}
lexer = chroma.Coalesce(lexer)
it, err := lexer.Tokenise(nil, string(contents))
kingpin.FatalIfError(err, "")
return it
}
func selexer(path, contents string) (lexer chroma.Lexer) {
if *lexerFlag != "" {
return lexers.Get(*lexerFlag)
}
if path != "" {
lexer := lexers.Match(path)
if lexer != nil {
return lexer
}
}
return lexers.Analyse(contents)
}
func format(w io.Writer, style *chroma.Style, it chroma.Iterator) {
formatter := formatters.Get(*formatterFlag)
err := formatter.Format(w, style, it)
kingpin.FatalIfError(err, "")
}