-
-
Notifications
You must be signed in to change notification settings - Fork 392
/
main.go
290 lines (264 loc) · 8.27 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
package main
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"os"
"os/signal"
"runtime"
"runtime/pprof"
"sort"
"strconv"
"strings"
"github.com/alecthomas/kong"
"github.com/mattn/go-colorable"
"github.com/mattn/go-isatty"
"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 = "?"
description = `
Chroma is a general purpose syntax highlighting library and corresponding
command, for Go.
`
cli struct {
Version kong.VersionFlag `help:"Show version."`
Profile string `hidden:"" help:"Enable profiling to file."`
List bool `help:"List lexers, styles and formatters."`
Unbuffered bool `help:"Do not buffer output."`
Trace bool `help:"Trace lexer states as they are traversed."`
Check bool `help:"Do not format, check for tokenisation errors instead."`
Filename string `help:"Filename to use for selecting a lexer when reading from stdin."`
Lexer string `help:"Lexer to use when formatting." default:"autodetect" short:"l" enum:"${lexers}"`
Style string `help:"Style to use for formatting." default:"swapoff" short:"s" enum:"${styles}"`
Formatter string `help:"Formatter to use." default:"terminal" short:"f" enum:"${formatters}"`
JSON bool `help:"Output JSON representation of tokens."`
HTML bool `help:"Enable HTML mode (equivalent to '--formatter html')."`
HTMLPrefix string `help:"HTML CSS class prefix." placeholder:"PREFIX"`
HTMLStyles bool `help:"Output HTML CSS styles."`
HTMLOnly bool `help:"Output HTML fragment."`
HTMLInlineStyles bool `help:"Output HTML with inline styles (no classes)."`
HTMLTabWidth int `help:"Set the HTML tab width." default:"8"`
HTMLLines bool `help:"Include line numbers in output."`
HTMLLinesTable bool `help:"Split line numbers and code in a HTML table"`
HTMLLinesStyle string `help:"Style for line numbers."`
HTMLHighlight string `help:"Highlight these lines." placeholder:"N[:M][,...]"`
HTMLHighlightStyle string `help:"Style used for highlighting lines."`
HTMLBaseLine int `help:"Base line number." default:"1"`
HTMLPreventSurroundingPre bool `help:"Prevent the surrounding pre tag."`
SVG bool `help:"Output SVG representation of tokens."`
Files []string `arg:"" optional:"" help:"Files to highlight." type:"existingfile"`
}
)
type flushableWriter interface {
io.Writer
Flush() error
}
type nopFlushableWriter struct{ io.Writer }
func (n *nopFlushableWriter) Flush() error { return nil }
func main() {
ctx := kong.Parse(&cli, kong.Description(description), kong.Vars{
"version": fmt.Sprintf("%s-%s-%s", version, commit, date),
"lexers": "autodetect," + strings.Join(lexers.Names(true), ","),
"styles": strings.Join(styles.Names(), ","),
"formatters": strings.Join(formatters.Names(), ","),
})
if cli.List {
listAll()
return
}
if cli.Profile != "" {
f, err := os.Create(cli.Profile)
ctx.FatalIfErrorf(err)
err = pprof.StartCPUProfile(f)
ctx.FatalIfErrorf(err)
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 cli.Unbuffered {
w = &nopFlushableWriter{out}
} else {
w = bufio.NewWriterSize(out, 16384)
}
defer w.Flush() // nolint: errcheck
switch {
case cli.JSON:
cli.Formatter = "json"
case cli.HTML:
cli.Formatter = "html"
case cli.SVG:
cli.Formatter = "svg"
}
// Retrieve user-specified style, clone it, and add some overrides.
builder := styles.Get(cli.Style).Builder()
if cli.HTMLHighlightStyle != "" {
builder.Add(chroma.LineHighlight, cli.HTMLHighlightStyle)
}
if cli.HTMLLinesStyle != "" {
builder.Add(chroma.LineNumbers, cli.HTMLLinesStyle)
}
style, err := builder.Build()
ctx.FatalIfErrorf(err)
// Dump styles.
if cli.HTMLStyles {
formatter := html.New(html.WithClasses(true))
err = formatter.WriteCSS(w, style)
ctx.FatalIfErrorf(err)
return
}
if cli.Formatter == "html" {
configureHTMLFormatter(ctx)
}
if len(cli.Files) == 0 {
contents, err := ioutil.ReadAll(os.Stdin)
ctx.FatalIfErrorf(err)
format(ctx, w, style, lex(ctx, cli.Filename, string(contents)))
} else {
for _, filename := range cli.Files {
contents, err := ioutil.ReadFile(filename)
ctx.FatalIfErrorf(err)
if cli.Check {
check(filename, lex(ctx, filename, string(contents)))
} else {
format(ctx, w, style, lex(ctx, filename, string(contents)))
}
}
}
}
func configureHTMLFormatter(ctx *kong.Context) {
options := []html.Option{
html.TabWidth(cli.HTMLTabWidth),
html.BaseLineNumber(cli.HTMLBaseLine),
}
if cli.HTMLPrefix != "" {
options = append(options, html.ClassPrefix(cli.HTMLPrefix))
}
if !cli.HTMLInlineStyles {
options = append(options, html.WithClasses(true))
}
if !cli.HTMLOnly {
options = append(options, html.Standalone(true))
}
if cli.HTMLLines {
options = append(options, html.WithLineNumbers(true))
}
if cli.HTMLLinesTable {
options = append(options, html.LineNumbersInTable(true))
}
if cli.HTMLPreventSurroundingPre {
options = append(options, html.PreventSurroundingPre(true))
}
if len(cli.HTMLHighlight) > 0 {
ranges := [][2]int{}
for _, span := range strings.Split(cli.HTMLHighlight, ",") {
parts := strings.Split(span, ":")
if len(parts) > 2 {
ctx.Fatalf("range should be N[:M], not %q", span)
}
start, err := strconv.ParseInt(parts[0], 10, 64)
ctx.FatalIfErrorf(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)
ctx.FatalIfErrorf(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...))
}
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.Names() {
fmt.Printf(" %s", name)
}
fmt.Println()
fmt.Printf("formatters:")
for _, name := range formatters.Names() {
fmt.Printf(" %s", name)
}
fmt.Println()
}
func lex(ctx *kong.Context, 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(cli.Trace)
}
lexer = chroma.Coalesce(lexer)
it, err := lexer.Tokenise(nil, contents)
ctx.FatalIfErrorf(err)
return it
}
func selexer(path, contents string) (lexer chroma.Lexer) {
if cli.Lexer != "autodetect" {
return lexers.Get(cli.Lexer)
}
if path != "" {
lexer := lexers.Match(path)
if lexer != nil {
return lexer
}
}
return lexers.Analyse(contents)
}
func format(ctx *kong.Context, w io.Writer, style *chroma.Style, it chroma.Iterator) {
formatter := formatters.Get(cli.Formatter)
err := formatter.Format(w, style, it)
ctx.FatalIfErrorf(err)
}
func check(filename string, it chroma.Iterator) {
line, col := 1, 0
for token := it(); token != chroma.EOF; token = it() {
if token.Type == chroma.Error {
fmt.Printf("%s:%d:%d %q\n", filename, line, col, token.String())
}
for _, c := range token.String() {
col++
if c == '\n' {
line, col = line+1, 0
}
}
}
}