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/registry.go

@@ -0,0 +1,210 @@
+package chroma
+
+import (
+	"path/filepath"
+	"sort"
+	"strings"
+)
+
+var (
+	ignoredSuffixes = [...]string{
+		// Editor backups
+		"~", ".bak", ".old", ".orig",
+		// Debian and derivatives apt/dpkg/ucf backups
+		".dpkg-dist", ".dpkg-old", ".ucf-dist", ".ucf-new", ".ucf-old",
+		// Red Hat and derivatives rpm backups
+		".rpmnew", ".rpmorig", ".rpmsave",
+		// Build system input/template files
+		".in",
+	}
+)
+
+// LexerRegistry is a registry of Lexers.
+type LexerRegistry struct {
+	Lexers  Lexers
+	byName  map[string]Lexer
+	byAlias map[string]Lexer
+}
+
+// NewLexerRegistry creates a new LexerRegistry of Lexers.
+func NewLexerRegistry() *LexerRegistry {
+	return &LexerRegistry{
+		byName:  map[string]Lexer{},
+		byAlias: map[string]Lexer{},
+	}
+}
+
+// Names of all lexers, optionally including aliases.
+func (l *LexerRegistry) Names(withAliases bool) []string {
+	out := []string{}
+	for _, lexer := range l.Lexers {
+		config := lexer.Config()
+		out = append(out, config.Name)
+		if withAliases {
+			out = append(out, config.Aliases...)
+		}
+	}
+	sort.Strings(out)
+	return out
+}
+
+// Get a Lexer by name, alias or file extension.
+func (l *LexerRegistry) Get(name string) Lexer {
+	if lexer := l.byName[name]; lexer != nil {
+		return lexer
+	}
+	if lexer := l.byAlias[name]; lexer != nil {
+		return lexer
+	}
+	if lexer := l.byName[strings.ToLower(name)]; lexer != nil {
+		return lexer
+	}
+	if lexer := l.byAlias[strings.ToLower(name)]; lexer != nil {
+		return lexer
+	}
+
+	candidates := PrioritisedLexers{}
+	// Try file extension.
+	if lexer := l.Match("filename." + name); lexer != nil {
+		candidates = append(candidates, lexer)
+	}
+	// Try exact filename.
+	if lexer := l.Match(name); lexer != nil {
+		candidates = append(candidates, lexer)
+	}
+	if len(candidates) == 0 {
+		return nil
+	}
+	sort.Sort(candidates)
+	return candidates[0]
+}
+
+// MatchMimeType attempts to find a lexer for the given MIME type.
+func (l *LexerRegistry) MatchMimeType(mimeType string) Lexer {
+	matched := PrioritisedLexers{}
+	for _, l := range l.Lexers {
+		for _, lmt := range l.Config().MimeTypes {
+			if mimeType == lmt {
+				matched = append(matched, l)
+			}
+		}
+	}
+	if len(matched) != 0 {
+		sort.Sort(matched)
+		return matched[0]
+	}
+	return nil
+}
+
+// Match returns the first lexer matching filename.
+//
+// Note that this iterates over all file patterns in all lexers, so is not fast.
+func (l *LexerRegistry) Match(filename string) Lexer {
+	filename = filepath.Base(filename)
+	matched := PrioritisedLexers{}
+	// First, try primary filename matches.
+	for _, lexer := range l.Lexers {
+		config := lexer.Config()
+		for _, glob := range config.Filenames {
+			ok, err := filepath.Match(glob, filename)
+			if err != nil { // nolint
+				panic(err)
+			} else if ok {
+				matched = append(matched, lexer)
+			} else {
+				for _, suf := range &ignoredSuffixes {
+					ok, err := filepath.Match(glob+suf, filename)
+					if err != nil {
+						panic(err)
+					} else if ok {
+						matched = append(matched, lexer)
+						break
+					}
+				}
+			}
+		}
+	}
+	if len(matched) > 0 {
+		sort.Sort(matched)
+		return matched[0]
+	}
+	matched = nil
+	// Next, try filename aliases.
+	for _, lexer := range l.Lexers {
+		config := lexer.Config()
+		for _, glob := range config.AliasFilenames {
+			ok, err := filepath.Match(glob, filename)
+			if err != nil { // nolint
+				panic(err)
+			} else if ok {
+				matched = append(matched, lexer)
+			} else {
+				for _, suf := range &ignoredSuffixes {
+					ok, err := filepath.Match(glob+suf, filename)
+					if err != nil {
+						panic(err)
+					} else if ok {
+						matched = append(matched, lexer)
+						break
+					}
+				}
+			}
+		}
+	}
+	if len(matched) > 0 {
+		sort.Sort(matched)
+		return matched[0]
+	}
+	return nil
+}
+
+// Analyse text content and return the "best" lexer..
+func (l *LexerRegistry) Analyse(text string) Lexer {
+	var picked Lexer
+	highest := float32(0.0)
+	for _, lexer := range l.Lexers {
+		if analyser, ok := lexer.(Analyser); ok {
+			weight := analyser.AnalyseText(text)
+			if weight > highest {
+				picked = lexer
+				highest = weight
+			}
+		}
+	}
+	return picked
+}
+
+// Register a Lexer with the LexerRegistry. If the lexer is already registered
+// it will be replaced.
+func (l *LexerRegistry) Register(lexer Lexer) Lexer {
+	lexer.SetRegistry(l)
+	config := lexer.Config()
+
+	l.byName[config.Name] = lexer
+	l.byName[strings.ToLower(config.Name)] = lexer
+
+	for _, alias := range config.Aliases {
+		l.byAlias[alias] = lexer
+		l.byAlias[strings.ToLower(alias)] = lexer
+	}
+
+	l.Lexers = add(l.Lexers, lexer)
+
+	return lexer
+}
+
+// add adds a lexer to a slice of lexers if it doesn't already exist, or if found will replace it.
+func add(lexers Lexers, lexer Lexer) Lexers {
+	for i, val := range lexers {
+		if val == nil {
+			continue
+		}
+
+		if val.Config().Name == lexer.Config().Name {
+			lexers[i] = lexer
+			return lexers
+		}
+	}
+
+	return append(lexers, lexer)
+}