fix: resolves #498

Resolves an issue whereby background colors were written to the terminal
output when colorization was applied.

cmd/cheat/main.go

@@ -13,7 +13,7 @@ import (
 	"github.com/cheat/cheat/internal/config"
 )
 
-const version = "3.0.5"
+const version = "3.0.6"
 
 func main() {
 

go.mod

@@ -3,7 +3,7 @@ module github.com/cheat/cheat
 go 1.13
 
 require (
-	github.com/alecthomas/chroma v0.6.7
+	github.com/alecthomas/chroma v0.6.8
 	github.com/davecgh/go-spew v1.1.1
 	github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815
 	github.com/mattn/go-isatty v0.0.10

go.sum

@@ -5,6 +5,8 @@ github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38 h1:smF2tmSOzy2Mm
 github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38/go.mod h1:r7bzyVFMNntcxPZXK3/+KdruV1H5KSlyVY0gc+NgInI=
 github.com/alecthomas/chroma v0.6.7 h1:1hKci+AyKOxJrugR9veaocu9DQGR2/GecI72BpaO0Rg=
 github.com/alecthomas/chroma v0.6.7/go.mod h1:zVlgtbRS7BJDrDY9SB238RmpoCBCYFlLmcfZ3durxTk=
+github.com/alecthomas/chroma v0.6.8 h1:TW4JJaIdbAbMyUtGEd6BukFlOKYvVQz3vVhLBEUNwMU=
+github.com/alecthomas/chroma v0.6.8/go.mod h1:o9ohftueRi7H5be3+Q2cQCNa/YnLBFUNx40ZJfGVFKA=
 github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721 h1:JHZL0hZKJ1VENNfmXvHbgYlbUOvpzYzvy2aZU5gXVeo=
 github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721/go.mod h1:QO9JBoKquHd+jz9nshCh40fOfO+JzsoXy8qTHF68zU0=
 github.com/alecthomas/kong v0.1.17-0.20190424132513-439c674f7ae0/go.mod h1:+inYUSluD+p4L8KdviBSgzcqEjUQOfC5fQDRFuc36lI=

vendor/github.com/alecthomas/chroma/.golangci.yml

@@ -15,6 +15,9 @@ linters:
     - gocyclo
     - dupl
     - gochecknoglobals
+    - funlen
+    - godox
+    - wsl
 
 linters-settings:
   govet:
@@ -43,3 +46,6 @@ issues:
     - 'Potential file inclusion via variable'
     - 'should have comment or be unexported'
     - 'comment on exported var .* should be of the form'
+    - 'at least one file in a package should have a package comment'
+    - 'string literal contains the Unicode'
+    - 'methods on the same type should have the same receiver name'

vendor/github.com/alecthomas/chroma/.travis.yml

@@ -2,7 +2,7 @@ sudo: false
 language: go
 script:
   - go test -v ./...
-  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s v1.15.0
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s v1.20.0
   - ./bin/golangci-lint run
   - git clean -fdx .
 after_success:

vendor/github.com/alecthomas/chroma/README.md

@@ -44,7 +44,7 @@ F | Factor, Fish, Forth, Fortran, FSharp
 G | GAS, GDScript, Genshi, Genshi HTML, Genshi Text, GLSL, Gnuplot, Go, Go HTML Template, Go Text Template, GraphQL, Groovy
 H | Handlebars, Haskell, Haxe, HCL, Hexdump, HTML, HTTP, Hy
 I | Idris, INI, Io
-J | Java, JavaScript, JSON, Julia, Jungle
+J | J, Java, JavaScript, JSON, Julia, Jungle
 K | Kotlin
 L | Lighttpd configuration file, LLVM, Lua
 M | Mako, markdown, Mason, Mathematica, Matlab, MiniZinc, Modula-2, MonkeyC, MorrowindScript, Myghty, MySQL

vendor/github.com/alecthomas/chroma/delegate.go

@@ -34,7 +34,7 @@ type insertion struct {
 	tokens     []Token
 }
 
-func (d *delegatingLexer) Tokenise(options *TokeniseOptions, text string) (Iterator, error) {
+func (d *delegatingLexer) Tokenise(options *TokeniseOptions, text string) (Iterator, error) { // nolint: gocognit
 	tokens, err := Tokenise(Coalesce(d.language), options, text)
 	if err != nil {
 		return nil, err

vendor/github.com/alecthomas/chroma/formatters/api.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/alecthomas/chroma"
 	"github.com/alecthomas/chroma/formatters/html"
+	"github.com/alecthomas/chroma/formatters/svg"
 )
 
 var (
@@ -20,6 +21,7 @@ var (
 	}))
 	// Default HTML formatter outputs self-contained HTML.
 	htmlFull = Register("html", html.New(html.Standalone(), html.WithClasses())) // nolint
+	SVG      = Register("svg", svg.New(svg.EmbedFont("Liberation Mono", svg.FontLiberationMono, svg.WOFF)))
 )
 
 // Fallback formatter.

vendor/github.com/alecthomas/chroma/formatters/html/html.go

@@ -91,11 +91,6 @@ func (h highlightRanges) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
 func (h highlightRanges) Less(i, j int) bool { return h[i][0] < h[j][0] }
 
 func (f *Formatter) Format(w io.Writer, style *chroma.Style, iterator chroma.Iterator) (err error) {
-	defer func() {
-		if perr := recover(); perr != nil {
-			err = perr.(error)
-		}
-	}()
 	return f.writeHTML(w, style, iterator.Tokens())
 }
 

vendor/github.com/alecthomas/chroma/formatters/svg/svg.go

@@ -0,0 +1,222 @@
+// Package svg contains an SVG formatter.
+package svg
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"path"
+	"strings"
+
+	"github.com/alecthomas/chroma"
+)
+
+// Option sets an option of the SVG formatter.
+type Option func(f *Formatter)
+
+// FontFamily sets the font-family.
+func FontFamily(fontFamily string) Option { return func(f *Formatter) { f.fontFamily = fontFamily } }
+
+// EmbedFontFile embeds given font file
+func EmbedFontFile(fontFamily string, fileName string) (option Option, err error) {
+	var format FontFormat
+	switch path.Ext(fileName) {
+	case ".woff":
+		format = WOFF
+	case ".woff2":
+		format = WOFF2
+	case ".ttf":
+		format = TRUETYPE
+	default:
+		return nil, errors.New("unexpected font file suffix")
+	}
+
+	var content []byte
+	if content, err = ioutil.ReadFile(fileName); err == nil {
+		option = EmbedFont(fontFamily, base64.StdEncoding.EncodeToString(content), format)
+	}
+	return
+}
+
+// EmbedFont embeds given base64 encoded font
+func EmbedFont(fontFamily string, font string, format FontFormat) Option {
+	return func(f *Formatter) { f.fontFamily = fontFamily; f.embeddedFont = font; f.fontFormat = format }
+}
+
+// New SVG formatter.
+func New(options ...Option) *Formatter {
+	f := &Formatter{fontFamily: "Consolas, Monaco, Lucida Console, Liberation Mono, DejaVu Sans Mono, Bitstream Vera Sans Mono, Courier New, monospace"}
+	for _, option := range options {
+		option(f)
+	}
+	return f
+}
+
+// Formatter that generates SVG.
+type Formatter struct {
+	fontFamily   string
+	embeddedFont string
+	fontFormat   FontFormat
+}
+
+func (f *Formatter) Format(w io.Writer, style *chroma.Style, iterator chroma.Iterator) (err error) {
+	f.writeSVG(w, style, iterator.Tokens())
+	return err
+}
+
+var svgEscaper = strings.NewReplacer(
+	`&`, "&",
+	`<`, "&lt;",
+	`>`, "&gt;",
+	`"`, "&quot;",
+	` `, "&#160;",
+	`	`, "&#160;&#160;&#160;&#160;",
+)
+
+// EscapeString escapes special characters.
+func escapeString(s string) string {
+	return svgEscaper.Replace(s)
+}
+
+func (f *Formatter) writeSVG(w io.Writer, style *chroma.Style, tokens []chroma.Token) { // nolint: gocyclo
+	svgStyles := f.styleToSVG(style)
+	lines := chroma.SplitTokensIntoLines(tokens)
+
+	fmt.Fprint(w, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
+	fmt.Fprint(w, "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\" \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n")
+	fmt.Fprintf(w, "<svg width=\"%dpx\" height=\"%dpx\" xmlns=\"http://www.w3.org/2000/svg\">\n", 8*maxLineWidth(lines), 10+int(16.8*float64(len(lines)+1)))
+
+	if f.embeddedFont != "" {
+		f.writeFontStyle(w)
+	}
+
+	fmt.Fprintf(w, "<rect width=\"100%%\" height=\"100%%\" fill=\"%s\"/>\n", style.Get(chroma.Background).Background.String())
+	fmt.Fprintf(w, "<g font-family=\"%s\" font-size=\"14px\" fill=\"%s\">\n", f.fontFamily, style.Get(chroma.Text).Colour.String())
+
+	f.writeTokenBackgrounds(w, lines, style)
+
+	for index, tokens := range lines {
+		fmt.Fprintf(w, "<text x=\"0\" y=\"%fem\" xml:space=\"preserve\">", 1.2*float64(index+1))
+
+		for _, token := range tokens {
+			text := escapeString(token.String())
+			attr := f.styleAttr(svgStyles, token.Type)
+			if attr != "" {
+				text = fmt.Sprintf("<tspan %s>%s</tspan>", attr, text)
+			}
+			fmt.Fprint(w, text)
+		}
+		fmt.Fprint(w, "</text>")
+	}
+
+	fmt.Fprint(w, "\n</g>\n")
+	fmt.Fprint(w, "</svg>\n")
+}
+
+func maxLineWidth(lines [][]chroma.Token) int {
+	maxWidth := 0
+	for _, tokens := range lines {
+		length := 0
+		for _, token := range tokens {
+			length += len(strings.Replace(token.String(), `	`, "    ", -1))
+		}
+		if length > maxWidth {
+			maxWidth = length
+		}
+	}
+	return maxWidth
+}
+
+// There is no background attribute for text in SVG so simply calculate the position and text
+// of tokens with a background color that differs from the default and add a rectangle for each before
+// adding the token.
+func (f *Formatter) writeTokenBackgrounds(w io.Writer, lines [][]chroma.Token, style *chroma.Style) {
+	for index, tokens := range lines {
+		lineLength := 0
+		for _, token := range tokens {
+			length := len(strings.Replace(token.String(), `	`, "    ", -1))
+			tokenBackground := style.Get(token.Type).Background
+			if tokenBackground.IsSet() && tokenBackground != style.Get(chroma.Background).Background {
+				fmt.Fprintf(w, "<rect id=\"%s\" x=\"%dch\" y=\"%fem\" width=\"%dch\" height=\"1.2em\" fill=\"%s\" />\n", escapeString(token.String()), lineLength, 1.2*float64(index)+0.25, length, style.Get(token.Type).Background.String())
+			}
+			lineLength += length
+		}
+	}
+}
+
+type FontFormat int
+
+// https://transfonter.org/formats
+const (
+	WOFF FontFormat = iota
+	WOFF2
+	TRUETYPE
+)
+
+var fontFormats = [...]string{
+	"woff",
+	"woff2",
+	"truetype",
+}
+
+func (f *Formatter) writeFontStyle(w io.Writer) {
+	fmt.Fprintf(w, `<style>
+@font-face {
+	font-family: '%s';
+	src: url(data:application/x-font-%s;charset=utf-8;base64,%s) format('%s');'
+	font-weight: normal;
+	font-style: normal;
+}
+</style>`, f.fontFamily, fontFormats[f.fontFormat], f.embeddedFont, fontFormats[f.fontFormat])
+}
+
+func (f *Formatter) styleAttr(styles map[chroma.TokenType]string, tt chroma.TokenType) string {
+	if _, ok := styles[tt]; !ok {
+		tt = tt.SubCategory()
+		if _, ok := styles[tt]; !ok {
+			tt = tt.Category()
+			if _, ok := styles[tt]; !ok {
+				return ""
+			}
+		}
+	}
+	return styles[tt]
+}
+
+func (f *Formatter) styleToSVG(style *chroma.Style) map[chroma.TokenType]string {
+	converted := map[chroma.TokenType]string{}
+	bg := style.Get(chroma.Background)
+	// Convert the style.
+	for t := range chroma.StandardTypes {
+		entry := style.Get(t)
+		if t != chroma.Background {
+			entry = entry.Sub(bg)
+		}
+		if entry.IsZero() {
+			continue
+		}
+		converted[t] = StyleEntryToSVG(entry)
+	}
+	return converted
+}
+
+// StyleEntryToSVG converts a chroma.StyleEntry to SVG attributes.
+func StyleEntryToSVG(e chroma.StyleEntry) string {
+	var styles []string
+
+	if e.Colour.IsSet() {
+		styles = append(styles, "fill=\""+e.Colour.String()+"\"")
+	}
+	if e.Bold == chroma.Yes {
+		styles = append(styles, "font-weight=\"bold\"")
+	}
+	if e.Italic == chroma.Yes {
+		styles = append(styles, "font-style=\"italic\"")
+	}
+	if e.Underline == chroma.Yes {
+		styles = append(styles, "text-decoration=\"underline\"")
+	}
+	return strings.Join(styles, " ")
+}

vendor/github.com/alecthomas/chroma/formatters/tty_indexed.go

@@ -200,6 +200,7 @@ func findClosest(table *ttyTable, seeking chroma.Colour) chroma.Colour {
 }
 
 func styleToEscapeSequence(table *ttyTable, style *chroma.Style) map[chroma.TokenType]string {
+	style = clearBackground(style)
 	out := map[chroma.TokenType]string{}
 	for _, ttype := range style.Types() {
 		entry := style.Get(ttype)
@@ -208,16 +209,22 @@ func styleToEscapeSequence(table *ttyTable, style *chroma.Style) map[chroma.Toke
 	return out
 }
 
+// Clear the background colour.
+func clearBackground(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
+}
+
 type indexedTTYFormatter struct {
 	table *ttyTable
 }
 
 func (c *indexedTTYFormatter) Format(w io.Writer, style *chroma.Style, it chroma.Iterator) (err error) {
-	defer func() {
-		if perr := recover(); perr != nil {
-			err = perr.(error)
-		}
-	}()
 	theme := styleToEscapeSequence(c.table, style)
 	for token := it(); token != chroma.EOF; token = it() {
 		// TODO: Cache token lookups?

vendor/github.com/alecthomas/chroma/formatters/tty_truecolour.go

@@ -11,6 +11,7 @@ import (
 var TTY16m = Register("terminal16m", chroma.FormatterFunc(trueColourFormatter))
 
 func trueColourFormatter(w io.Writer, style *chroma.Style, it chroma.Iterator) error {
+	style = clearBackground(style)
 	for token := it(); token != chroma.EOF; token = it() {
 		entry := style.Get(token.Type)
 		if !entry.IsZero() {

vendor/github.com/alecthomas/chroma/go.mod

@@ -14,9 +14,12 @@ require (
 	github.com/gorilla/mux v1.7.3
 	github.com/mattn/go-colorable v0.0.9
 	github.com/mattn/go-isatty v0.0.4
+	github.com/pkg/errors v0.8.1
 	github.com/sergi/go-diff v1.0.0 // indirect
 	github.com/stretchr/testify v1.3.0
 	golang.org/x/sys v0.0.0-20181128092732-4ed8d59d0b35 // indirect
 )
 
 replace github.com/GeertJohan/go.rice => github.com/alecthomas/go.rice v1.0.1-0.20190719113735-961b99d742e7
+
+go 1.13

vendor/github.com/alecthomas/chroma/lexers/README.md

@@ -10,10 +10,28 @@ Run the tests as normal:
 go test ./lexers
 ```
 
-## Updating the existing tests
+## Update existing tests
+When you add a new test data file (`*.actual`), you need to regenerate all tests. That's how Chroma creates the `*.expected` test file based on the corresponding lexer.
 
-You can regenerate all the test outputs
+To regenerate all tests, type in your terminal:
 
 ```go
 RECORD=true go test ./lexers
 ```
+
+This first sets the `RECORD` environment variable to `true`. Then it runs `go test` on the `./lexers` directory of the Chroma project.
+
+(That environment variable tells Chroma it needs to output test data. After running `go test ./lexers` you can remove or reset that variable.)
+
+### Windows users
+Windows users will find that the `RECORD=true go test ./lexers` command fails in both the standard command prompt terminal and in PowerShell.
+
+Instead we have to perform both steps separately:
+
+- Set the `RECORD` environment variable to `true`.
+	+ In the regular command prompt window, the `set` command sets an environment variable for the current session: `set RECORD=true`. See [this page](https://superuser.com/questions/212150/how-to-set-env-variable-in-windows-cmd-line) for more.
+	+ In PowerShell, you can use the `$env:RECORD = 'true'` command for that. See [this article](https://mcpmag.com/articles/2019/03/28/environment-variables-in-powershell.aspx) for more.
+	+ You can also make a persistent environment variable by hand in the Windows computer settings. See [this article](https://www.computerhope.com/issues/ch000549.htm) for how.
+- When the environment variable is set, run `go tests ./lexers`.
+
+Chroma will now regenerate the test files and print its results to the console window.

vendor/github.com/alecthomas/chroma/lexers/a/applescript.go

@@ -31,7 +31,7 @@ var Applescript = internal.Register(MustNewLexer(
 			{`\b(as )(alias |application |boolean |class |constant |date |file |integer |list |number |POSIX file |real |record |reference |RGB color |script |text |unit types|(?:Unicode )?text|string)\b`, ByGroups(Keyword, NameClass), nil},
 			{`\b(AppleScript|current application|false|linefeed|missing value|pi|quote|result|return|space|tab|text item delimiters|true|version)\b`, NameConstant, nil},
 			{`\b(ASCII (character|number)|activate|beep|choose URL|choose application|choose color|choose file( name)?|choose folder|choose from list|choose remote application|clipboard info|close( access)?|copy|count|current date|delay|delete|display (alert|dialog)|do shell script|duplicate|exists|get eof|get volume settings|info for|launch|list (disks|folder)|load script|log|make|mount volume|new|offset|open( (for access|location))?|path to|print|quit|random number|read|round|run( script)?|say|scripting components|set (eof|the clipboard to|volume)|store script|summarize|system attribute|system info|the clipboard|time to GMT|write|quoted form)\b`, NameBuiltin, nil},
-			{`\b(considering|else|error|exit|from|if|ignoring|in|repeat|tell|then|times|to|try|until|using terms from|while|whith|with timeout( of)?|with transaction|by|continue|end|its?|me|my|return|of|as)\b`, Keyword, nil},
+			{`\b(considering|else|error|exit|from|if|ignoring|in|repeat|tell|then|times|to|try|until|using terms from|while|with|with timeout( of)?|with transaction|by|continue|end|its?|me|my|return|of|as)\b`, Keyword, nil},
 			{`\b(global|local|prop(erty)?|set|get)\b`, Keyword, nil},
 			{`\b(but|put|returning|the)\b`, NameBuiltin, nil},
 			{`\b(attachment|attribute run|character|day|month|paragraph|word|year)s?\b`, NameBuiltin, nil},

vendor/github.com/alecthomas/chroma/lexers/b/ballerina.go

@@ -25,7 +25,7 @@ var Ballerina = internal.Register(MustNewLexer(
 			{`(annotation|bind|but|endpoint|error|function|object|private|public|returns|service|type|var|with|worker)\b`, KeywordDeclaration, nil},
 			{`(boolean|byte|decimal|float|int|json|map|nil|record|string|table|xml)\b`, KeywordType, nil},
 			{`(true|false|null)\b`, KeywordConstant, nil},
-			{`import(\s+)`, ByGroups(KeywordNamespace, Text), Push("import")},
+			{`(import)(\s+)`, ByGroups(KeywordNamespace, Text), Push("import")},
 			{`"(\\\\|\\"|[^"])*"`, LiteralString, nil},
 			{`'\\.'|'[^\\]'|'\\u[0-9a-fA-F]{4}'`, LiteralStringChar, nil},
 			{`(\.)((?:[^\W\d]|\$)[\w$]*)`, ByGroups(Operator, NameAttribute), nil},

vendor/github.com/alecthomas/chroma/lexers/b/bibtex.go

@@ -0,0 +1,76 @@
+package b
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+// Bibtex lexer.
+var Bibtex = internal.Register(MustNewLexer(
+	&Config{
+		Name:            "BibTeX",
+		Aliases:         []string{"bib", "bibtex"},
+		Filenames:       []string{"*.bib"},
+		MimeTypes:       []string{"text/x-bibtex"},
+		NotMultiline:    true,
+		CaseInsensitive: true,
+	},
+	Rules{
+		"root": {
+			Include("whitespace"),
+			{`@comment`, Comment, nil},
+			{`@preamble`, NameClass, Push("closing-brace", "value", "opening-brace")},
+			{`@string`, NameClass, Push("closing-brace", "field", "opening-brace")},
+			{"@[a-z_@!$&*+\\-./:;<>?\\[\\\\\\]^`|~][\\w@!$&*+\\-./:;<>?\\[\\\\\\]^`|~]*", NameClass, Push("closing-brace", "command-body", "opening-brace")},
+			{`.+`, Comment, nil},
+		},
+		"opening-brace": {
+			Include("whitespace"),
+			{`[{(]`, Punctuation, Pop(1)},
+		},
+		"closing-brace": {
+			Include("whitespace"),
+			{`[})]`, Punctuation, Pop(1)},
+		},
+		"command-body": {
+			Include("whitespace"),
+			{`[^\s\,\}]+`, NameLabel, Push("#pop", "fields")},
+		},
+		"fields": {
+			Include("whitespace"),
+			{`,`, Punctuation, Push("field")},
+			Default(Pop(1)),
+		},
+		"field": {
+			Include("whitespace"),
+			{"[a-z_@!$&*+\\-./:;<>?\\[\\\\\\]^`|~][\\w@!$&*+\\-./:;<>?\\[\\\\\\]^`|~]*", NameAttribute, Push("value", "=")},
+			Default(Pop(1)),
+		},
+		"=": {
+			Include("whitespace"),
+			{`=`, Punctuation, Pop(1)},
+		},
+		"value": {
+			Include("whitespace"),
+			{"[a-z_@!$&*+\\-./:;<>?\\[\\\\\\]^`|~][\\w@!$&*+\\-./:;<>?\\[\\\\\\]^`|~]*", NameVariable, nil},
+			{`"`, LiteralString, Push("quoted-string")},
+			{`\{`, LiteralString, Push("braced-string")},
+			{`[\d]+`, LiteralNumber, nil},
+			{`#`, Punctuation, nil},
+			Default(Pop(1)),
+		},
+		"quoted-string": {
+			{`\{`, LiteralString, Push("braced-string")},
+			{`"`, LiteralString, Pop(1)},
+			{`[^\{\"]+`, LiteralString, nil},
+		},
+		"braced-string": {
+			{`\{`, LiteralString, Push()},
+			{`\}`, LiteralString, Pop(1)},
+			{`[^\{\}]+`, LiteralString, nil},
+		},
+		"whitespace": {
+			{`\s+`, Text, nil},
+		},
+	},
+))

vendor/github.com/alecthomas/chroma/lexers/c/cpp.go

@@ -24,7 +24,8 @@ var CPP = internal.Register(MustNewLexer(
 			{`(u8|u|U)(")`, ByGroups(LiteralStringAffix, LiteralString), Push("string")},
 			{`(L?)(")`, ByGroups(LiteralStringAffix, LiteralString), Push("string")},
 			{`(L?)(')(\\.|\\[0-7]{1,3}|\\x[a-fA-F0-9]{1,2}|[^\\\'\n])(')`, ByGroups(LiteralStringAffix, LiteralStringChar, LiteralStringChar, LiteralStringChar), nil},
-			{`(\.([0-9](?:'?[0-9]+)*)([eE][+-]?([0-9]('?[0-9]+)*))?|([0-9]('?[0-9]+)*)(([eE][+-]?([0-9]('?[0-9]+)*))|\.([0-9]('?[0-9]+)*)?([eE][+-]?([0-9]('?[0-9]+)*))?)|0[xX](\.([0-9A-Fa-f]('?[0-9A-Fa-f]+)*)([pP][-+]?([0-9]('?[0-9]+)*))?|([0-9A-Fa-f]('?[0-9A-Fa-f]+)*)(([pP][-+]?([0-9]('?[0-9]+)*))|\.([0-9A-Fa-f]('?[0-9A-Fa-f]+)*)?([pP][-+]?([0-9]('?[0-9]+)*))?)))[fFLlUu]*`, LiteralNumberFloat, nil},
+			{`(\d+\.\d*|\.\d+|\d+)[eE][+-]?\d+[LlUu]*`, LiteralNumberFloat, nil},
+			{`(\d+\.\d*|\.\d+|\d+[fF])[fF]?`, LiteralNumberFloat, nil},
 			{`0[xX]([0-9A-Fa-f]('?[0-9A-Fa-f]+)*)[LlUu]*`, LiteralNumberHex, nil},
 			{`0('?[0-7]+)+[LlUu]*`, LiteralNumberOct, nil},
 			{`0[Bb][01]('?[01]+)*[LlUu]*`, LiteralNumberBin, nil},

vendor/github.com/alecthomas/chroma/lexers/d/docker.go

@@ -22,7 +22,7 @@ var Docker = internal.Register(MustNewLexer(
 			{`(ONBUILD)((?:\s*\\?\s*))`, ByGroups(Keyword, Using(b.Bash)), nil},
 			{`(HEALTHCHECK)(((?:\s*\\?\s*)--\w+=\w+(?:\s*\\?\s*))*)`, ByGroups(Keyword, Using(b.Bash)), nil},
 			{`(VOLUME|ENTRYPOINT|CMD|SHELL)((?:\s*\\?\s*))(\[.*?\])`, ByGroups(Keyword, Using(b.Bash), Using(j.JSON)), nil},
-			{`(LABEL|ENV|ARG)(((?:\s*\\?\s*)\w+=\w+(?:\s*\\?\s*))*)`, ByGroups(Keyword, Using(b.Bash)), nil},
+			{`(LABEL|ENV|ARG)((?:(?:\s*\\?\s*)\w+=\w+(?:\s*\\?\s*))*)`, ByGroups(Keyword, Using(b.Bash)), nil},
 			{`((?:FROM|MAINTAINER|EXPOSE|WORKDIR|USER|STOPSIGNAL)|VOLUME)\b(.*)`, ByGroups(Keyword, LiteralString), nil},
 			{`((?:RUN|CMD|ENTRYPOINT|ENV|ARG|LABEL|ADD|COPY))`, Keyword, nil},
 			{`(.*\\\n)*.+`, Using(b.Bash), nil},

vendor/github.com/alecthomas/chroma/lexers/h/http.go

@@ -38,7 +38,6 @@ func httpContentBlock(groups []string, lexer Lexer) Iterator {
 		{Generic, groups[0]},
 	}
 	return Literator(tokens...)
-
 }
 
 func httpHeaderBlock(groups []string, lexer Lexer) Iterator {
@@ -66,7 +65,7 @@ func httpBodyContentTypeLexer(lexer Lexer) Lexer { return &httpBodyContentTyper{
 
 type httpBodyContentTyper struct{ Lexer }
 
-func (d *httpBodyContentTyper) Tokenise(options *TokeniseOptions, text string) (Iterator, error) {
+func (d *httpBodyContentTyper) Tokenise(options *TokeniseOptions, text string) (Iterator, error) { // nolint: gocognit
 	var contentType string
 	var isContentType bool
 	var subIterator Iterator
@@ -123,9 +122,7 @@ func (d *httpBodyContentTyper) Tokenise(options *TokeniseOptions, text string) (
 					return EOF
 				}
 			}
-
 		}
 		return token
-
 	}, nil
 }

vendor/github.com/alecthomas/chroma/lexers/internal/api.go

@@ -1,3 +1,4 @@
+// Package internal contains common API functions and structures shared between lexer packages.
 package internal
 
 import (

vendor/github.com/alecthomas/chroma/lexers/j/j.go

@@ -0,0 +1,73 @@
+package j
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+// J lexer.
+var J = internal.Register(MustNewLexer(
+	&Config{
+		Name:      "J",
+		Aliases:   []string{"j"},
+		Filenames: []string{"*.ijs"},
+		MimeTypes: []string{"text/x-j"},
+	},
+	Rules{
+		"root": {
+			{`#!.*$`, CommentPreproc, nil},
+			{`NB\..*`, CommentSingle, nil},
+			{`\n+\s*Note`, CommentMultiline, Push("comment")},
+			{`\s*Note.*`, CommentSingle, nil},
+			{`\s+`, Text, nil},
+			{`'`, LiteralString, Push("singlequote")},
+			{`0\s+:\s*0|noun\s+define\s*$`, NameEntity, Push("nounDefinition")},
+			{`(([1-4]|13)\s+:\s*0|(adverb|conjunction|dyad|monad|verb)\s+define)\b`, NameFunction, Push("explicitDefinition")},
+			{Words(``, `\b[a-zA-Z]\w*\.`, `for_`, `goto_`, `label_`), NameLabel, nil},
+			{Words(``, `\.`, `assert`, `break`, `case`, `catch`, `catchd`, `catcht`, `continue`, `do`, `else`, `elseif`, `end`, `fcase`, `for`, `if`, `return`, `select`, `throw`, `try`, `while`, `whilst`), NameLabel, nil},
+			{`\b[a-zA-Z]\w*`, NameVariable, nil},
+			{Words(``, ``, `ARGV`, `CR`, `CRLF`, `DEL`, `Debug`, `EAV`, `EMPTY`, `FF`, `JVERSION`, `LF`, `LF2`, `Note`, `TAB`, `alpha17`, `alpha27`, `apply`, `bind`, `boxopen`, `boxxopen`, `bx`, `clear`, `cutLF`, `cutopen`, `datatype`, `def`, `dfh`, `drop`, `each`, `echo`, `empty`, `erase`, `every`, `evtloop`, `exit`, `expand`, `fetch`, `file2url`, `fixdotdot`, `fliprgb`, `getargs`, `getenv`, `hfd`, `inv`, `inverse`, `iospath`, `isatty`, `isutf8`, `items`, `leaf`, `list`, `nameclass`, `namelist`, `names`, `nc`, `nl`, `on`, `pick`, `rows`, `script`, `scriptd`, `sign`, `sminfo`, `smoutput`, `sort`, `split`, `stderr`, `stdin`, `stdout`, `table`, `take`, `timespacex`, `timex`, `tmoutput`, `toCRLF`, `toHOST`, `toJ`, `tolower`, `toupper`, `type`, `ucp`, `ucpcount`, `usleep`, `utf8`, `uucp`), NameFunction, nil},
+			{`=[.:]`, Operator, nil},
+			{"[-=+*#$%@!~`^&\";:.,<>{}\\[\\]\\\\|/]", Operator, nil},
+			{`[abCdDeEfHiIjLMoprtT]\.`, KeywordReserved, nil},
+			{`[aDiLpqsStux]\:`, KeywordReserved, nil},
+			{`(_[0-9])\:`, KeywordConstant, nil},
+			{`\(`, Punctuation, Push("parentheses")},
+			Include("numbers"),
+		},
+		"comment": {
+			{`[^)]`, CommentMultiline, nil},
+			{`^\)`, CommentMultiline, Pop(1)},
+			{`[)]`, CommentMultiline, nil},
+		},
+		"explicitDefinition": {
+			{`\b[nmuvxy]\b`, NameDecorator, nil},
+			Include("root"),
+			{`[^)]`, Name, nil},
+			{`^\)`, NameLabel, Pop(1)},
+			{`[)]`, Name, nil},
+		},
+		"numbers": {
+			{`\b_{1,2}\b`, LiteralNumber, nil},
+			{`_?\d+(\.\d+)?(\s*[ejr]\s*)_?\d+(\.?=\d+)?`, LiteralNumber, nil},
+			{`_?\d+\.(?=\d+)`, LiteralNumberFloat, nil},
+			{`_?\d+x`, LiteralNumberIntegerLong, nil},
+			{`_?\d+`, LiteralNumberInteger, nil},
+		},
+		"nounDefinition": {
+			{`[^)]`, LiteralString, nil},
+			{`^\)`, NameLabel, Pop(1)},
+			{`[)]`, LiteralString, nil},
+		},
+		"parentheses": {
+			{`\)`, Punctuation, Pop(1)},
+			Include("explicitDefinition"),
+			Include("root"),
+		},
+		"singlequote": {
+			{`[^']`, LiteralString, nil},
+			{`''`, LiteralString, nil},
+			{`'`, LiteralString, Pop(1)},
+		},
+	},
+))

vendor/github.com/alecthomas/chroma/lexers/n/nim.go

@@ -16,6 +16,7 @@ var Nim = internal.Register(MustNewLexer(
 	},
 	Rules{
 		"root": {
+			{`#\[[\s\S]*?\]#`, CommentMultiline, nil},
 			{`##.*$`, LiteralStringDoc, nil},
 			{`#.*$`, Comment, nil},
 			{`[*=><+\-/@$~&%!?|\\\[\]]`, Operator, nil},

vendor/github.com/alecthomas/chroma/regexp.go

@@ -35,8 +35,13 @@ func ByGroups(emitters ...Emitter) Emitter {
 	return EmitterFunc(func(groups []string, lexer Lexer) Iterator {
 		iterators := make([]Iterator, 0, len(groups)-1)
 		// NOTE: If this panics, there is a mismatch with groups
-		for i, group := range groups[1:] {
+		if len(emitters) != len(groups)-1 {
-			iterators = append(iterators, emitters[i].Emit([]string{group}, lexer))
+			iterators = append(iterators, Error.Emit(groups, lexer))
+			// panic(errors.Errorf("number of groups %q does not match number of emitters %v", groups, emitters))
+		} else {
+			for i, group := range groups[1:] {
+				iterators = append(iterators, emitters[i].Emit([]string{group}, lexer))
+			}
 		}
 		return Concaterator(iterators...)
 	})
@@ -255,7 +260,7 @@ func (l *LexerState) Get(key interface{}) interface{} {
 }
 
 // Iterator returns the next Token from the lexer.
-func (l *LexerState) Iterator() Token {
+func (l *LexerState) Iterator() Token { // nolint: gocognit
 	for l.Pos < len(l.Text) && len(l.Stack) > 0 {
 		// Exhaust the iterator stack, if any.
 		for len(l.iteratorStack) > 0 {

vendor/github.com/alecthomas/chroma/remap.go

@@ -66,7 +66,6 @@ func TypeRemappingLexer(lexer Lexer, mapping TypeMapping) Lexer {
 				km[k] = rt.To
 			}
 		}
-
 	}
 	return RemappingLexer(lexer, func(t Token) []Token {
 		if k, ok := lut[t.Type]; ok {

vendor/modules.txt

@@ -1,7 +1,8 @@
-# github.com/alecthomas/chroma v0.6.7
+# github.com/alecthomas/chroma v0.6.8
 github.com/alecthomas/chroma
 github.com/alecthomas/chroma/formatters
 github.com/alecthomas/chroma/formatters/html
+github.com/alecthomas/chroma/formatters/svg
 github.com/alecthomas/chroma/lexers
 github.com/alecthomas/chroma/lexers/a
 github.com/alecthomas/chroma/lexers/b
@@ -48,8 +49,6 @@ github.com/mattn/go-isatty
 github.com/mgutz/ansi
 # github.com/mitchellh/go-homedir v1.1.0
 github.com/mitchellh/go-homedir
-# github.com/tj/front v0.0.0-20170212063142-739be213b0a1
-github.com/tj/front
 # golang.org/x/sys v0.0.0-20191008105621-543471e840be
 golang.org/x/sys/unix
 # gopkg.in/yaml.v1 v1.0.0-20140924161607-9f9df34309c0