chore(deps): bump chroma to v2 #735

Bump `alecthomas/chroma` to `v2`:
https://github.com/cheat/cheat/issues/735

vendor/github.com/alecthomas/chroma/v2/lexers/lexers.go

@@ -0,0 +1,79 @@
+package lexers
+
+import (
+	"embed"
+	"io/fs"
+
+	"github.com/alecthomas/chroma/v2"
+)
+
+//go:embed embedded
+var embedded embed.FS
+
+// GlobalLexerRegistry is the global LexerRegistry of Lexers.
+var GlobalLexerRegistry = func() *chroma.LexerRegistry {
+	reg := chroma.NewLexerRegistry()
+	// index(reg)
+	paths, err := fs.Glob(embedded, "embedded/*.xml")
+	if err != nil {
+		panic(err)
+	}
+	for _, path := range paths {
+		reg.Register(chroma.MustNewXMLLexer(embedded, path))
+	}
+	return reg
+}()
+
+// Names of all lexers, optionally including aliases.
+func Names(withAliases bool) []string {
+	return GlobalLexerRegistry.Names(withAliases)
+}
+
+// Get a Lexer by name, alias or file extension.
+//
+// Note that this if there isn't an exact match on name or alias, this will
+// call Match(), so it is not efficient.
+func Get(name string) chroma.Lexer {
+	return GlobalLexerRegistry.Get(name)
+}
+
+// MatchMimeType attempts to find a lexer for the given MIME type.
+func MatchMimeType(mimeType string) chroma.Lexer {
+	return GlobalLexerRegistry.MatchMimeType(mimeType)
+}
+
+// Match returns the first lexer matching filename.
+//
+// Note that this iterates over all file patterns in all lexers, so it's not
+// particularly efficient.
+func Match(filename string) chroma.Lexer {
+	return GlobalLexerRegistry.Match(filename)
+}
+
+// Register a Lexer with the global registry.
+func Register(lexer chroma.Lexer) chroma.Lexer {
+	return GlobalLexerRegistry.Register(lexer)
+}
+
+// Analyse text content and return the "best" lexer..
+func Analyse(text string) chroma.Lexer {
+	return GlobalLexerRegistry.Analyse(text)
+}
+
+// PlaintextRules is used for the fallback lexer as well as the explicit
+// plaintext lexer.
+func PlaintextRules() chroma.Rules {
+	return chroma.Rules{
+		"root": []chroma.Rule{
+			{`.+`, chroma.Text, nil},
+			{`\n`, chroma.Text, nil},
+		},
+	}
+}
+
+// Fallback lexer if no other is found.
+var Fallback chroma.Lexer = chroma.MustNewLexer(&chroma.Config{
+	Name:      "fallback",
+	Filenames: []string{"*"},
+	Priority:  -1,
+}, PlaintextRules)