add wildcards (*, ?, [...])

- unquoted * ? and [...] (including [!...]) are expanded to the
  matching file names, sorted, per path component
- hidden files only match if the pattern starts with a dot, a trailing /
  only matches directories, a pattern without match is kept as is
- quoted or escaped characters and values of variables are never
  expanded
- redirections to a pattern must match exactly one file
- completion escapes * ? [ and $ in file names

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -23,6 +23,9 @@ Features:
     override with $GOSH_HISTFILE); lines starting with a space are not saved
   - Tab completion for commands and file paths
   - Tilde expansion (~, ~/path) at the start of unquoted words
+  - Wildcards: * ? [abc] [a-z] [!abc] match file names (not hidden files
+    unless the pattern starts with a dot); quoted wildcards and values of
+    variables are not expanded, a pattern without match is kept as is
   - Colored prompt (user@host green, red for root; directory blue),
     configurable with $GOSH_COLORS, e.g. GOSH_COLORS='user=1;33:path=36'
     (keys user, root, path; values are ANSI SGR codes, empty = no color);
@@ -83,6 +86,32 @@ Status 127
 
 Schlägt ein Programm fehl, gibt gosh selbst keine Meldung mehr aus (das Programm meldet den Fehler selbst), nur bei Fehlern von gosh, z. B. wenn ein Befehl nicht gefunden wird.
 
+### Wildcards
+
+Wörter mit `*`, `?` oder `[...]` werden durch die passenden Dateinamen ersetzt, sortiert:
+
+| Muster    | passt auf                                           |
+|-----------|-----------------------------------------------------|
+| `*`       | beliebig viele Zeichen (auch keine)                 |
+| `?`       | genau ein Zeichen                                   |
+| `[abc]`   | eines der Zeichen `a`, `b`, `c`                     |
+| `[a-z]`   | ein Zeichen aus dem Bereich                         |
+| `[!abc]`  | ein Zeichen außer `a`, `b`, `c` (auch `[^abc]`)     |
+
+```
+$ ls *.go
+main.go  main_test.go
+$ cat logs/2026-*/error.log
+$ ls -d */            # nur Verzeichnisse
+```
+
+- Muster gelten pro Pfadteil, `*` passt nie auf `/`: `*/*.go` findet `.go`-Dateien eine Ebene tiefer.
+- Versteckte Dateien (mit `.` am Anfang) werden nur gefunden, wenn das Muster selbst mit `.` beginnt: `*` findet `.bashrc` nicht, `.*rc` schon.
+- Passt keine Datei, bleibt das Wort unverändert stehen (wie in `sh`), `ls *.xyz` meldet dann also `ls` den Fehler.
+- In Anführungszeichen oder mit `\` davor sind die Zeichen normale Zeichen: `echo "*"`, `echo '*.go'`, `echo \*`.
+- Werte von Variablen werden nicht als Muster behandelt (anders als in `sh`): Nach `set P=*.go` gibt `echo $P` wörtlich `*.go` aus. So kann ein Variablenwert nie unbemerkt auf viele Dateien passen. `echo $DIR/*.go` funktioniert dagegen, weil das `*` direkt in der Zeile steht.
+- Bei einer Umleitung muss das Muster genau eine Datei treffen (`> *.log`), sonst meldet gosh `ambiguous redirect`.
+
 ### Pipes und Umleitungen
 
 ```

main.go

@@ -12,6 +12,7 @@ import (
 	"os/user"
 	"path/filepath"
 	"runtime/debug"
+	"sort"
 	"strconv"
 	"strings"
 	"syscall"
@@ -113,10 +114,12 @@ func expandTilde(path string) string {
 
 // token is a word or an operator of a command line.
 type token struct {
-	op   string // "" for a word, otherwise |, <, >, >>, >&, <&, &> or &>>
+	op      string // "" for a word, otherwise |, <, >, >>, >&, <&, &> or &>>
-	word string // the word, if op == ""
+	word    string // the word, if op == ""
-	fd   int    // the redirected file descriptor (for redirections)
+	pattern string // the word as glob pattern (quoted characters escaped)
-	dup  int    // the target file descriptor of >& and <&
+	glob    bool   // the word contains unquoted * ? or [ and is expanded
+	fd      int    // the redirected file descriptor (for redirections)
+	dup     int    // the target file descriptor of >& and <&
 }
 
 // tokenize splits input into words and operators like a (very) simple POSIX
@@ -136,7 +139,9 @@ func tokenize(input string) ([]token, error) {
 	var (
 		tokens   []token
 		b        strings.Builder
-		inWord   bool // a word has been started (even if it is still empty)
+		pat      strings.Builder // the word as glob pattern, quoted parts escaped
+		glob     bool            // the word contains unquoted * ? or [
+		inWord   bool            // a word has been started (even if it is still empty)
 		quote    byte
 		escaped  bool
 		rawStart = -1 // start of the current word in input
@@ -144,12 +149,19 @@ func tokenize(input string) ([]token, error) {
 
 	endWord := func() {
 		if inWord {
-			tokens = append(tokens, token{word: b.String()})
+			tokens = append(tokens, token{word: b.String(), pattern: pat.String(), glob: glob})
 		}
 		b.Reset()
+		pat.Reset()
+		glob = false
 		inWord = false
 		rawStart = -1
 	}
+	// literal adds quoted, escaped or expanded text: it is never a pattern
+	literal := func(s string) {
+		b.WriteString(s)
+		pat.WriteString(escapeGlob(s))
+	}
 	startRaw := func(i int) {
 		if rawStart < 0 {
 			rawStart = i
@@ -161,16 +173,16 @@ func tokenize(input string) ([]token, error) {
 		switch {
 		case escaped:
 			if quote == '"' && !strings.ContainsRune("$\"\\`", rune(ch)) {
-				b.WriteByte('\\')
+				literal("\\")
 			}
-			b.WriteByte(ch)
+			literal(string(ch))
 			inWord = true
 			escaped = false
 		case quote == '\'':
 			if ch == '\'' {
 				quote = 0
 			} else {
-				b.WriteByte(ch)
+				literal(string(ch))
 			}
 		case ch == '\\':
 			startRaw(i)
@@ -181,7 +193,9 @@ func tokenize(input string) ([]token, error) {
 			if err != nil {
 				return nil, err
 			}
-			b.WriteString(value)
+			// Expanded values are never patterns (and never split), so that
+			// e.g. a * in a variable does not match files
+			literal(value)
 			// A literal "$" counts as content, an expansion that is empty does
 			// not (unless quoted), like in sh
 			if n == 1 || value != "" {
@@ -192,7 +206,7 @@ func tokenize(input string) ([]token, error) {
 			if ch == '"' {
 				quote = 0
 			} else {
-				b.WriteByte(ch)
+				literal(string(ch))
 			}
 		case ch == '"' || ch == '\'':
 			startRaw(i)
@@ -225,6 +239,8 @@ func tokenize(input string) ([]token, error) {
 			if inWord && rawStart >= 0 && isDigits(input[rawStart:i]) {
 				fd, _ = strconv.Atoi(input[rawStart:i])
 				b.Reset()
+				pat.Reset()
+				glob = false
 				inWord = false
 				rawStart = -1
 			} else {
@@ -256,11 +272,21 @@ func tokenize(input string) ([]token, error) {
 			if home == "" {
 				home = "~"
 			}
-			b.WriteString(home)
+			literal(home)
 			inWord = true
 		default:
 			startRaw(i)
 			b.WriteByte(ch)
+			switch {
+			case ch == '*' || ch == '?' || ch == '[':
+				glob = true
+				pat.WriteByte(ch)
+			case ch == '!' && strings.HasSuffix(pat.String(), "[") && !strings.HasSuffix(pat.String(), "\\["):
+				// POSIX [!...] is [^...] in Go
+				pat.WriteByte('^')
+			default:
+				pat.WriteByte(ch)
+			}
 			inWord = true
 		}
 	}
@@ -275,6 +301,123 @@ func tokenize(input string) ([]token, error) {
 	return tokens, nil
 }
 
+// escapeGlob escapes the characters that are special in a glob pattern.
+func escapeGlob(s string) string {
+	var b strings.Builder
+	for i := 0; i < len(s); i++ {
+		if strings.IndexByte("*?[]\\", s[i]) >= 0 {
+			b.WriteByte('\\')
+		}
+		b.WriteByte(s[i])
+	}
+	return b.String()
+}
+
+// hasGlobMeta reports whether pattern contains an unescaped * ? or [.
+func hasGlobMeta(pattern string) bool {
+	for i := 0; i < len(pattern); i++ {
+		switch pattern[i] {
+		case '\\':
+			i++
+		case '*', '?', '[':
+			return true
+		}
+	}
+	return false
+}
+
+// unescapeGlob removes the escapes from a pattern without wildcards.
+func unescapeGlob(pattern string) string {
+	var b strings.Builder
+	for i := 0; i < len(pattern); i++ {
+		if pattern[i] == '\\' && i+1 < len(pattern) {
+			i++
+		}
+		b.WriteByte(pattern[i])
+	}
+	return b.String()
+}
+
+// expandGlob returns the paths matching pattern, sorted. Like sh, * and ?
+// do not match a leading dot (hidden files), unless the pattern component
+// starts with a dot, and a trailing / only matches directories. An invalid
+// pattern matches nothing.
+func expandGlob(pattern string) []string {
+	paths := []string{""}
+	if strings.HasPrefix(pattern, "/") {
+		paths = []string{"/"}
+	}
+	components := strings.Split(strings.Trim(pattern, "/"), "/")
+	join := func(dir, name string) string {
+		if dir == "" || strings.HasSuffix(dir, "/") {
+			return dir + name
+		}
+		return dir + "/" + name
+	}
+
+	for _, comp := range components {
+		if comp == "" {
+			continue // a//b
+		}
+		var next []string
+		for _, dir := range paths {
+			if !hasGlobMeta(comp) {
+				p := join(dir, unescapeGlob(comp))
+				if _, err := os.Lstat(p); err == nil {
+					next = append(next, p)
+				}
+				continue
+			}
+			readDir := dir
+			if readDir == "" {
+				readDir = "."
+			}
+			entries, err := os.ReadDir(readDir)
+			if err != nil {
+				continue
+			}
+			for _, e := range entries {
+				name := e.Name()
+				if strings.HasPrefix(name, ".") && !strings.HasPrefix(comp, ".") && !strings.HasPrefix(comp, "\\.") {
+					continue
+				}
+				ok, err := filepath.Match(comp, name)
+				if err != nil {
+					return nil
+				}
+				if ok {
+					next = append(next, join(dir, name))
+				}
+			}
+		}
+		paths = next
+	}
+
+	if strings.HasSuffix(pattern, "/") {
+		var dirs []string
+		for _, p := range paths {
+			if info, err := os.Stat(p); err == nil && info.IsDir() {
+				dirs = append(dirs, p+"/")
+			}
+		}
+		paths = dirs
+	}
+	sort.Strings(paths)
+	return paths
+}
+
+// expandWord returns the words a token expands to: the matching paths for
+// a pattern, or the word itself if it is no pattern or nothing matches (like
+// in sh).
+func expandWord(t token) []string {
+	if t.glob {
+		if matches := expandGlob(t.pattern); len(matches) > 0 {
+			return matches
+		}
+	}
+	return []string{t.word}
+}
+
 // isDigits reports whether s is a non-empty string of ASCII digits.
 func isDigits(s string) bool {
 	if s == "" {
@@ -668,7 +811,7 @@ func currentWord(s string) (word string, start int, quote byte) {
 func escapeWord(s string) string {
 	var b strings.Builder
 	for _, r := range s {
-		if strings.ContainsRune(" \t\\'\";|&<>", r) {
+		if strings.ContainsRune(" \t\\'\";|&<>*?[$", r) {
 			b.WriteByte('\\')
 		}
 		b.WriteRune(r)
@@ -1131,7 +1274,7 @@ func parsePipeline(tokens []token) ([]stage, error) {
 		t := tokens[i]
 		switch t.op {
 		case "":
-			cur.args = append(cur.args, t.word)
+			cur.args = append(cur.args, expandWord(t)...)
 		case "|":
 			if isEmpty(cur) {
 				return nil, syntaxError("|")
@@ -1148,7 +1291,11 @@ func parsePipeline(tokens []token) ([]stage, error) {
 				return nil, syntaxError(next.op)
 			}
 			i++
-			cur.redirects = append(cur.redirects, redirect{op: t.op, fd: t.fd, file: tokens[i].word})
+			files := expandWord(tokens[i])
+			if len(files) > 1 {
+				return nil, fmt.Errorf("%s: ambiguous redirect", sanitize(tokens[i].word))
+			}
+			cur.redirects = append(cur.redirects, redirect{op: t.op, fd: t.fd, file: files[0]})
 		}
 	}
 
@@ -1430,6 +1577,9 @@ Features:
     override with $GOSH_HISTFILE); lines starting with a space are not saved
   - Tab completion for commands and file paths
   - Tilde expansion (~, ~/path) at the start of unquoted words
+  - Wildcards: * ? [abc] [a-z] [!abc] match file names (not hidden files
+    unless the pattern starts with a dot); quoted wildcards and values of
+    variables are not expanded, a pattern without match is kept as is
   - Colored prompt (user@host green, red for root; directory blue),
     configurable with $GOSH_COLORS, e.g. GOSH_COLORS='user=1;33:path=36'
     (keys user, root, path; values are ANSI SGR codes, empty = no color);

main_test.go

@@ -1514,6 +1514,10 @@ func TestTokenize_Operators(t *testing.T) {
 			t.Errorf("tokenize(%q) returned error: %v", tc.input, err)
 			continue
 		}
+		// Patterns are tested in TestTokenize_Patterns
+		for i := range got {
+			got[i].pattern, got[i].glob = "", false
+		}
 		if !reflect.DeepEqual(got, tc.want) {
 			t.Errorf("tokenize(%q) = %+v, want %+v", tc.input, got, tc.want)
 		}
@@ -1620,3 +1624,109 @@ func TestExecInput_RedirectionErrors(t *testing.T) {
 		t.Error("file f must not be created for a bad file descriptor")
 	}
 }
+
+func TestTokenize_Patterns(t *testing.T) {
+	t.Setenv("GOSH_GLOB", "*.go")
+	tests := []struct {
+		input   string
+		pattern string
+		glob    bool
+	}{
+		{"*.go", "*.go", true},
+		{"a?c", "a?c", true},
+		{"[ab].go", "[ab].go", true},
+		{"[!a].go", "[^a].go", true},
+		{"plain", "plain", false},
+		// Quoted, escaped and expanded characters are literal
+		{`"*.go"`, `\*.go`, false},
+		{`'*'.go`, `\*.go`, false},
+		{`\*.go`, `\*.go`, false},
+		{`"x"*`, `x*`, true},
+		{"$GOSH_GLOB", `\*.go`, false},
+		{`'['!a].go`, `\[!a].go`, false},
+	}
+	for _, tc := range tests {
+		tokens, err := tokenize(tc.input)
+		if err != nil || len(tokens) != 1 {
+			t.Errorf("tokenize(%q) = %+v, %v", tc.input, tokens, err)
+			continue
+		}
+		if tokens[0].pattern != tc.pattern || tokens[0].glob != tc.glob {
+			t.Errorf("tokenize(%q): pattern %q, glob %v; want %q, %v",
+				tc.input, tokens[0].pattern, tokens[0].glob, tc.pattern, tc.glob)
+		}
+	}
+}
+
+func TestExpandGlob(t *testing.T) {
+	origDir, _ := os.Getwd()
+	defer os.Chdir(origDir)
+	dir := t.TempDir()
+	os.Chdir(dir)
+	for _, d := range []string{"sub/deep", "other"} {
+		os.MkdirAll(d, 0755)
+	}
+	for _, f := range []string{"a.go", "b.go", "c.txt", ".hidden.go", "with space.go", "[x].go", "sub/s1.go", "sub/deep/d.go", "other/o.go"} {
+		os.WriteFile(f, nil, 0644)
+	}
+
+	tests := []struct {
+		pattern string
+		want    []string
+	}{
+		{"*.go", []string{"[x].go", "a.go", "b.go", "with space.go"}},
+		{".*.go", []string{".hidden.go"}},
+		{"?.go", []string{"a.go", "b.go"}},
+		{"[ab].go", []string{"a.go", "b.go"}},
+		{"[^a].go", []string{"b.go"}},
+		{"*/*.go", []string{"other/o.go", "sub/s1.go"}},
+		{"*/", []string{"other/", "sub/"}},
+		{"sub/*/*.go", []string{"sub/deep/d.go"}},
+		{"./c*", []string{"./c.txt"}},
+		{dir + "/c*", []string{dir + "/c.txt"}},
+		{`\[x\].go`, []string{"[x].go"}},
+		{"*.xyz", nil},
+		{"[", nil},
+	}
+	for _, tc := range tests {
+		if got := expandGlob(tc.pattern); !reflect.DeepEqual(got, tc.want) {
+			t.Errorf("expandGlob(%q) = %q, want %q", tc.pattern, got, tc.want)
+		}
+	}
+}
+
+func TestExecInput_Wildcards(t *testing.T) {
+	origDir, _ := os.Getwd()
+	defer os.Chdir(origDir)
+	dir := t.TempDir()
+	os.Chdir(dir)
+	for _, f := range []string{"a.go", "b.go", "c.txt"} {
+		os.WriteFile(f, []byte(f+"\n"), 0644)
+	}
+
+	tests := []struct {
+		input string
+		want  string
+	}{
+		{"echo *.go > out", "a.go b.go\n"},
+		{"cat *.go > out", "a.go\nb.go\n"},
+		// No match: the word is passed on unchanged, like in sh
+		{"echo *.xyz > out", "*.xyz\n"},
+		{`echo "*.go" '?.go' \*.go > out`, "*.go ?.go *.go\n"},
+		// A redirection to a pattern with a single match uses that file
+		{"echo hi > *.txt; cat c.txt > out", "hi\n"},
+	}
+	for _, tc := range tests {
+		if err := execInput(tc.input); err != nil {
+			t.Errorf("execInput(%q) returned error: %v", tc.input, err)
+		}
+		if got, _ := os.ReadFile("out"); string(got) != tc.want {
+			t.Errorf("%q: got %q, want %q", tc.input, got, tc.want)
+		}
+	}
+
+	err := execInput("echo hi > *.go")
+	if err == nil || err.Error() != "*.go: ambiguous redirect" {
+		t.Errorf("expected ambiguous redirect error, got %v", err)
+	}
+}