Add XSLT lexer

pkg/language/chroma/lexer.go

@@ -20,6 +20,7 @@ func RegisterAll() {
 		SketchDrawing{},
 		Slim{},
 		XAML{},
+		XSLT{},
 	}
 
 	// Register all lexers.

pkg/language/chroma/testdata/xslt.xsl

@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+
+  <xsl:output method="text"/>
+
+  <xsl:template match="/">
+    Article - <xsl:value-of select="/Article/Title"/>
+    Authors: <xsl:apply-templates select="/Article/Authors/Author"/>
+  </xsl:template>
+
+  <xsl:template match="Author">
+    - <xsl:value-of select="." />
+  </xsl:template>
+
+</xsl:stylesheet>

pkg/language/chroma/xslt.go

@@ -0,0 +1,37 @@
+package chroma
+
+import (
+	"strings"
+
+	"github.com/wakatime/wakatime-cli/pkg/xml"
+
+	"github.com/alecthomas/chroma/v2"
+	"github.com/alecthomas/chroma/v2/lexers"
+)
+
+// XSLT lexer.
+type XSLT struct{}
+
+// Register the lexer.
+func (XSLT) Register() {
+	_ = lexers.Register(chroma.MustNewLexer(
+		&chroma.Config{
+			Name:    "XSLT",
+			Aliases: []string{"xslt"},
+			// xpl is XProc
+			Filenames: []string{"*.xsl", "*.xslt", "*.xpl"},
+			MimeTypes: []string{"application/xsl+xml", "application/xslt+xml"},
+		},
+		func() chroma.Rules {
+			return chroma.Rules{
+				"root": {},
+			}
+		},
+	)).SetAnalyser(func(text string) float32 {
+		if xml.MatchString(text) && strings.Contains(text, "<xsl") {
+			return 0.8
+		}
+
+		return 0
+	})
+}

pkg/language/chroma/xslt_test.go

@@ -0,0 +1,28 @@
+package chroma_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/wakatime/wakatime-cli/pkg/language/chroma"
+
+	c "github.com/alecthomas/chroma/v2"
+	"github.com/alecthomas/chroma/v2/lexers"
+	"github.com/stretchr/testify/assert"
+)
+
+func init() {
+	chroma.XSLT{}.Register()
+}
+
+func TestXSLT_AnalyseText(t *testing.T) {
+	data, err := os.ReadFile("testdata/xslt.xsl")
+	assert.NoError(t, err)
+
+	l := lexers.Get("XSLT")
+
+	analyser, ok := l.(c.Analyser)
+	assert.True(t, ok)
+
+	assert.Equal(t, float32(0.8), analyser.AnalyseText(string(data)))
+}