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WIP: Waifufetch by JGH0 working in windows-bash

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This commit is contained in:
Cametendo
2026-05-28 21:00:34 +02:00
parent 114cbf43bd
commit 7b3a101946
8 changed files with 1354 additions and 105 deletions
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531
internal/shell/builtins.go
View File

@@ -6,6 +6,7 @@ import (
"io"
"os"
"path/filepath"
"regexp"
"runtime"
"sort"
"strconv"
@@ -18,59 +19,67 @@ var aliases = make(map[string]string)
func (s *Shell) initBuiltins() {
s.builtins = map[string]func([]string) error{
// Shell builtins
"cd": s.builtinCd,
"pwd": s.builtinPwd,
"echo": s.builtinEcho,
"exit": s.builtinExit,
"export": s.builtinExport,
"source": s.builtinSource,
".": s.builtinSource,
"alias": s.builtinAlias,
"unalias": s.builtinUnalias,
"type": s.builtinType,
"test": s.builtinTest,
"[": s.builtinTest,
"read": s.builtinRead,
"printf": s.builtinPrintf,
"true": s.builtinTrue,
"false": s.builtinFalse,
"set": s.builtinSet,
"unset": s.builtinUnset,
"env": s.builtinEnv,
"which": s.builtinWhich,
"return": s.builtinReturn,
"break": s.builtinBreak,
"continue": s.builtinContinue,
"shift": s.builtinShift,
"declare": s.builtinDeclare,
"local": s.builtinDeclare,
"command": s.builtinCommand,
"jobs": s.builtinJobs,
"cd": s.builtinCd,
"pwd": s.builtinPwd,
"echo": s.builtinEcho,
"exit": s.builtinExit,
"export": s.builtinExport,
"source": s.builtinSource,
".": s.builtinSource,
"alias": s.builtinAlias,
"unalias": s.builtinUnalias,
"type": s.builtinType,
"test": s.builtinTest,
"[": s.builtinTest,
"[[": s.builtinDoubleBracket,
"read": s.builtinRead,
"printf": s.builtinPrintf,
"true": s.builtinTrue,
"false": s.builtinFalse,
"set": s.builtinSet,
"unset": s.builtinUnset,
"env": s.builtinEnv,
"which": s.builtinWhich,
"return": s.builtinReturn,
"break": s.builtinBreak,
"continue": s.builtinContinue,
"shift": s.builtinShift,
"declare": s.builtinDeclare,
"local": s.builtinDeclare,
"command": s.builtinCommand,
"jobs": s.builtinJobs,
"disown": s.builtinDisown,
"mktemp": s.builtinMktemp,
"uname": s.builtinUname,
"whoami": s.builtinWhoami,
"hostname": s.builtinHostname,
"mapfile": s.builtinMapfile,
"readarray": s.builtinMapfile,
// Coreutils
"ls": s.cmdLs,
"cat": s.cmdCat,
"grep": s.cmdGrep,
"head": s.cmdHead,
"tail": s.cmdTail,
"sort": s.cmdSort,
"wc": s.cmdWc,
"find": s.cmdFind,
"cp": s.cmdCp,
"mv": s.cmdMv,
"rm": s.cmdRm,
"mkdir": s.cmdMkdir,
"touch": s.cmdTouch,
"clear": s.cmdClear,
"cut": s.cmdCut,
"tr": s.cmdTr,
"uniq": s.cmdUniq,
"tee": s.cmdTee,
"date": s.cmdDate,
"sleep": s.cmdSleep,
"ls": s.cmdLs,
"cat": s.cmdCat,
"grep": s.cmdGrep,
"head": s.cmdHead,
"tail": s.cmdTail,
"sort": s.cmdSort,
"wc": s.cmdWc,
"find": s.cmdFind,
"cp": s.cmdCp,
"mv": s.cmdMv,
"rm": s.cmdRm,
"mkdir": s.cmdMkdir,
"touch": s.cmdTouch,
"clear": s.cmdClear,
"cut": s.cmdCut,
"tr": s.cmdTr,
"uniq": s.cmdUniq,
"tee": s.cmdTee,
"date": s.cmdDate,
"sleep": s.cmdSleep,
"basename": s.cmdBasename,
"dirname": s.cmdDirname,
"sed": s.cmdSed,
"xargs": s.cmdXargs,
"dirname": s.cmdDirname,
"sed": s.cmdSed,
"xargs": s.cmdXargs,
}
}
@@ -532,9 +541,58 @@ func (s *Shell) builtinSet(args []string) error {
}
return nil
}
// Handle positional params: set -- a b c
if args[0] == "--" {
s.SetArgs(args[1:])
i := 0
for i < len(args) {
switch args[i] {
case "--":
s.SetArgs(args[i+1:])
return nil
case "-e":
s.errexit = true
case "+e":
s.errexit = false
case "-u":
s.nounset = true
case "+u":
s.nounset = false
case "-x":
// xtrace — ignore
case "+x":
// xtrace off — ignore
case "-o":
if i+1 < len(args) {
switch args[i+1] {
case "pipefail":
s.pipefail = true
i++
case "errexit":
s.errexit = true
i++
case "nounset":
s.nounset = true
i++
}
}
case "+o":
if i+1 < len(args) {
i++ // ignore value
}
default:
// Combined flags like -euo
if strings.HasPrefix(args[i], "-") {
for _, c := range args[i][1:] {
switch c {
case 'e':
s.errexit = true
case 'u':
s.nounset = true
case 'x':
// xtrace — ignore
}
}
}
}
i++
}
return nil
}
@@ -619,14 +677,71 @@ func (s *Shell) builtinShift(args []string) error {
}
func (s *Shell) builtinDeclare(args []string) error {
for _, arg := range args {
// Parse flags
nameref := false
isArray := false
isExport := false
nonFlagStart := 0
for i, arg := range args {
if !strings.HasPrefix(arg, "-") {
nonFlagStart = i
break
}
nonFlagStart = i + 1
for _, ch := range arg[1:] {
switch ch {
case 'n':
nameref = true
case 'a':
isArray = true
case 'i':
// integer — treat as scalar
case 'r':
// readonly — ignore
case 'x':
isExport = true
case 'g':
// global — ignore
}
}
}
for _, arg := range args[nonFlagStart:] {
if strings.HasPrefix(arg, "-") {
continue
}
if idx := strings.Index(arg, "="); idx > 0 {
name := arg[:idx]
if isValidIdentifier(name) {
s.vars[name] = arg[idx+1:]
if !isValidIdentifier(name) {
continue
}
value := s.expandWord(arg[idx+1:])
if nameref {
s.namerefs[name] = value
} else if isArray {
if strings.HasPrefix(value, "(") && strings.HasSuffix(value, ")") {
inner := value[1 : len(value)-1]
elems := s.tokenize(inner)
s.setArray(name, elems)
} else {
s.setArray(name, []string{value})
}
} else {
s.vars[name] = value
if isExport {
os.Setenv(name, value)
}
}
} else {
// No = — just declare
if !isValidIdentifier(arg) {
continue
}
if isArray {
if s.arrays[arg] == nil {
s.arrays[arg] = []string{}
}
}
}
}
@@ -634,6 +749,23 @@ func (s *Shell) builtinDeclare(args []string) error {
}
func (s *Shell) builtinCommand(args []string) error {
if len(args) > 0 && args[0] == "-v" {
found := true
for _, name := range args[1:] {
if _, ok := s.builtins[name]; ok {
fmt.Fprintln(s.Stdout, name)
} else if p := findExecutable(name); p != "" {
fmt.Fprintln(s.Stdout, p)
} else {
found = false
fmt.Fprintf(s.Stderr, "bash: command not found: %s\n", name)
}
}
if !found {
return exitCodeErr{1}
}
return nil
}
if len(args) == 0 {
return nil
}
@@ -646,6 +778,291 @@ func (s *Shell) builtinJobs(_ []string) error {
return nil
}
func (s *Shell) builtinDisown(_ []string) error { return nil }
func (s *Shell) builtinMktemp(args []string) error {
template := ""
for _, a := range args {
if !strings.HasPrefix(a, "-") {
template = a
break
}
}
// Use Windows temp dir regardless of the /tmp/ prefix in template
tmpDir := os.Getenv("TEMP")
if tmpDir == "" {
tmpDir = os.Getenv("TMP")
}
if tmpDir == "" {
tmpDir = os.TempDir()
}
// Extract the base pattern (strip directory prefix)
base := filepath.Base(template)
if base == "" || base == "." {
base = "tmp.XXXXXX"
}
// Replace trailing X's with * for os.CreateTemp
xCount := 0
for i := len(base) - 1; i >= 0 && base[i] == 'X'; i-- {
xCount++
}
goPattern := base
if xCount > 0 {
goPattern = base[:len(base)-xCount] + "*"
}
f, err := os.CreateTemp(tmpDir, goPattern)
if err != nil {
return fmt.Errorf("mktemp: %v", err)
}
f.Close()
fmt.Fprintln(s.Stdout, f.Name())
return nil
}
func (s *Shell) builtinUname(args []string) error {
showSys := len(args) == 0
showRelease := false
for _, a := range args {
switch a {
case "-s":
showSys = true
case "-r":
showRelease = true
case "-a":
showSys = true
showRelease = true
}
}
if showSys {
fmt.Fprintln(s.Stdout, "Windows_NT")
}
if showRelease {
kernelRel := os.Getenv("OS_VERSION")
if kernelRel == "" {
kernelRel = "10.0"
}
fmt.Fprintln(s.Stdout, kernelRel)
}
return nil
}
func (s *Shell) builtinWhoami(_ []string) error {
user := os.Getenv("USERNAME")
if user == "" {
user = os.Getenv("USER")
}
if user == "" {
user = "unknown"
}
fmt.Fprintln(s.Stdout, user)
return nil
}
func (s *Shell) builtinHostname(_ []string) error {
h, err := os.Hostname()
if err != nil {
h = os.Getenv("COMPUTERNAME")
}
if h == "" {
h = "unknown"
}
fmt.Fprintln(s.Stdout, h)
return nil
}
func (s *Shell) builtinMapfile(args []string) error {
varName := ""
trimNewlines := false
for _, a := range args {
if a == "-t" {
trimNewlines = true
} else if !strings.HasPrefix(a, "-") {
varName = a
}
}
if varName == "" {
varName = "MAPFILE"
}
var lines []string
scanner := bufio.NewScanner(s.Stdin)
for scanner.Scan() {
line := scanner.Text()
if !trimNewlines {
line += "\n"
}
lines = append(lines, line)
}
s.setArray(varName, lines)
return nil
}
// builtinDoubleBracket implements [[ ... ]]
func (s *Shell) builtinDoubleBracket(args []string) error {
// Strip trailing ]] if present
if len(args) > 0 && args[len(args)-1] == "]]" {
args = args[:len(args)-1]
}
if !s.evalDB(args) {
return exitCodeErr{1}
}
return nil
}
// evalDB evaluates a [[ ... ]] expression.
func (s *Shell) evalDB(args []string) bool {
if len(args) == 0 {
return false
}
// 1. || — lowest precedence, scan right-to-left
for i := len(args) - 1; i >= 0; i-- {
if args[i] == "||" {
return s.evalDB(args[:i]) || s.evalDB(args[i+1:])
}
}
// 2. &&
for i := len(args) - 1; i >= 0; i-- {
if args[i] == "&&" {
return s.evalDB(args[:i]) && s.evalDB(args[i+1:])
}
}
// 3. ! prefix
if args[0] == "!" {
return !s.evalDB(args[1:])
}
// 4. Unary flags
if len(args) == 2 {
val := args[1]
switch args[0] {
case "-f":
info, err := os.Stat(val)
return err == nil && info.Mode().IsRegular()
case "-e":
_, err := os.Stat(val)
return err == nil
case "-d":
info, err := os.Stat(val)
return err == nil && info.IsDir()
case "-s":
info, err := os.Stat(val)
return err == nil && info.Size() > 0
case "-r":
f, err := os.Open(val)
if err != nil {
return false
}
f.Close()
return true
case "-w":
f, err := os.OpenFile(val, os.O_WRONLY, 0)
if err != nil {
return false
}
f.Close()
return true
case "-x":
info, err := os.Stat(val)
return err == nil && (info.Mode()&0111 != 0 || runtime.GOOS == "windows")
case "-n":
return val != ""
case "-z":
return val == ""
case "-L":
_, err := os.Lstat(val)
return err == nil
case "-v":
_, ok := s.vars[val]
if !ok {
_, ok = s.arrays[val]
}
return ok
}
}
// 5. Binary operators
if len(args) == 3 {
lhs, op, rhs := args[0], args[1], args[2]
switch op {
case "==":
matched, err := filepath.Match(rhs, lhs)
if err != nil {
return lhs == rhs
}
return matched
case "!=":
matched, err := filepath.Match(rhs, lhs)
if err != nil {
return lhs != rhs
}
return !matched
case "=~":
matched, err := regexp.MatchString(rhs, lhs)
return err == nil && matched
case "<":
return lhs < rhs
case ">":
return lhs > rhs
case "-eq":
ln, le := strconv.Atoi(lhs)
rn, re := strconv.Atoi(rhs)
if le != nil || re != nil {
return false
}
return ln == rn
case "-ne":
ln, le := strconv.Atoi(lhs)
rn, re := strconv.Atoi(rhs)
if le != nil || re != nil {
return false
}
return ln != rn
case "-lt":
ln, le := strconv.Atoi(lhs)
rn, re := strconv.Atoi(rhs)
if le != nil || re != nil {
return false
}
return ln < rn
case "-le":
ln, le := strconv.Atoi(lhs)
rn, re := strconv.Atoi(rhs)
if le != nil || re != nil {
return false
}
return ln <= rn
case "-gt":
ln, le := strconv.Atoi(lhs)
rn, re := strconv.Atoi(rhs)
if le != nil || re != nil {
return false
}
return ln > rn
case "-ge":
ln, le := strconv.Atoi(lhs)
rn, re := strconv.Atoi(rhs)
if le != nil || re != nil {
return false
}
return ln >= rn
}
}
// 6. Single arg truthy test
if len(args) == 1 {
return args[0] != ""
}
return false
}
// ─── Coreutils ────────────────────────────────────────────────────────────────
func (s *Shell) cmdLs(args []string) error {

292
internal/shell/control.go
View File

@@ -2,6 +2,7 @@ package shell
import (
"fmt"
"path/filepath"
"strings"
)
@@ -85,6 +86,125 @@ func (s *Shell) executeIf(block string) error {
return nil
}
// executeCase handles: case WORD in PAT1) BODY1 ;; PAT2) BODY2 ;; esac
// splitStatements emits ";;" as a separate token, so we can parse arms directly.
func (s *Shell) executeCase(block string) error {
stmts := splitStatements(block)
if len(stmts) == 0 {
return nil
}
// First stmt: "case WORD in"
caseHeader := stmts[0]
caseRest := strings.TrimSpace(strings.TrimPrefix(strings.TrimSpace(caseHeader), "case"))
var word string
var startIdx int
// Find trailing " in" to separate word from "in"
inIdx := strings.LastIndex(caseRest, " in")
if inIdx >= 0 && strings.TrimSpace(caseRest[inIdx+3:]) == "" {
word = s.expandWord(strings.TrimSpace(caseRest[:inIdx]))
startIdx = 1
} else {
word = s.expandWord(caseRest)
startIdx = 1
if startIdx < len(stmts) && strings.TrimSpace(stmts[startIdx]) == "in" {
startIdx++
}
}
// Parse arms from remaining stmts
// stmts now include ";;" as explicit tokens
type arm struct {
patterns []string
body []string
}
var arms []arm
var curArm *arm
for _, stmt := range stmts[startIdx:] {
stmt = strings.TrimSpace(stmt)
if stmt == "" {
continue
}
if stmt == "esac" {
break
}
if stmt == ";;" || stmt == ";&" || stmt == ";;&" {
curArm = nil
continue
}
if curArm == nil {
// Expect a pattern: PAT) [body]
parenIdx := findCasePatternEnd(stmt)
if parenIdx < 0 {
continue
}
patStr := strings.TrimSpace(stmt[:parenIdx])
bodyStr := strings.TrimSpace(stmt[parenIdx+1:])
rawPats := strings.Split(patStr, "|")
var pats []string
for _, p := range rawPats {
p = strings.TrimSpace(p)
if p != "" {
pats = append(pats, p)
}
}
arms = append(arms, arm{patterns: pats})
curArm = &arms[len(arms)-1]
if bodyStr != "" {
curArm.body = append(curArm.body, bodyStr)
}
} else {
curArm.body = append(curArm.body, stmt)
}
}
// Execute matching arm
for _, a := range arms {
for _, pat := range a.patterns {
expandedPat := s.expandWord(pat)
matched := false
if expandedPat == "*" {
matched = true
} else {
if m, err := filepath.Match(expandedPat, word); err == nil {
matched = m
} else {
matched = expandedPat == word
}
}
if matched {
body := strings.Join(a.body, "\n")
return s.Execute(body)
}
}
}
return nil
}
// findCasePatternEnd finds the ) that ends the pattern in a case arm.
// Handles quoted strings.
func findCasePatternEnd(chunk string) int {
inSingle := false
inDouble := false
for i := 0; i < len(chunk); i++ {
c := chunk[i]
switch {
case c == '\'' && !inDouble:
inSingle = !inSingle
case c == '"' && !inSingle:
inDouble = !inDouble
case c == ')' && !inSingle && !inDouble:
return i
}
}
return -1
}
// executeFor handles: for VAR in WORDS; do BODY; done
// (also: for VAR; do BODY; done — iterates positional params)
func (s *Shell) executeFor(block string) error {
@@ -95,7 +215,8 @@ func (s *Shell) executeFor(block string) error {
// Parse "for VAR in WORDS"
header := stmts[0]
fields := strings.Fields(header)
// Use tokenize so array expansion works in "for x in ${arr[@]}"
fields := s.tokenize(header)
if len(fields) < 2 {
return fmt.Errorf("for: bad syntax")
}
@@ -110,10 +231,8 @@ func (s *Shell) executeFor(block string) error {
}
}
if inIdx >= 0 {
for _, raw := range fields[inIdx+1:] {
expanded := s.expandWord(raw)
items = append(items, s.expandGlob(expanded)...)
}
// Items are already expanded by tokenize
items = fields[inIdx+1:]
} else {
// for var; do ... → iterate positional params
items = s.args
@@ -164,6 +283,169 @@ func (s *Shell) executeFor(block string) error {
return nil
}
// executeForC handles C-style: for ((init; cond; incr)); do BODY; done
func (s *Shell) executeForC(block string) error {
stmts := splitStatements(block)
if len(stmts) == 0 {
return nil
}
// Extract the ((...)) header
header := stmts[0]
// Find "for" keyword and then "(("
trimmed := strings.TrimSpace(header)
// Strip "for" keyword
trimmed = strings.TrimSpace(trimmed[3:]) // skip "for"
// Expect "(("
if !strings.HasPrefix(trimmed, "((") {
return fmt.Errorf("for: bad C-style syntax")
}
trimmed = trimmed[2:] // skip "(("
// Find closing "))"
endIdx := strings.Index(trimmed, "))")
if endIdx < 0 {
return fmt.Errorf("for: missing '))'")
}
inner := trimmed[:endIdx]
// Split on ; to get init, cond, incr
parts := strings.SplitN(inner, ";", 3)
init := ""
cond := ""
incr := ""
if len(parts) >= 1 {
init = strings.TrimSpace(parts[0])
}
if len(parts) >= 2 {
cond = strings.TrimSpace(parts[1])
}
if len(parts) >= 3 {
incr = strings.TrimSpace(parts[2])
}
// Execute init as arithmetic assignment
if init != "" {
s.execArithAssign(init)
}
// Collect body between "do" and "done"
var bodyStmts []string
inBody := false
for _, stmt := range stmts[1:] {
w := firstWord(stmt)
if !inBody {
if w == "do" {
inBody = true
if rest := afterWord(stmt); rest != "" {
bodyStmts = append(bodyStmts, rest)
}
}
continue
}
if w == "done" {
break
}
bodyStmts = append(bodyStmts, stmt)
}
body := strings.Join(bodyStmts, "\n")
for {
// Evaluate condition
if cond != "" {
if s.evalArith(cond) == 0 {
break
}
}
if err := s.Execute(body); err != nil {
if be, ok := err.(breakErr); ok {
if be.n <= 1 {
break
}
return breakErr{be.n - 1}
}
if ce, ok := err.(continueErr); ok {
if ce.n <= 1 {
// continue — execute incr then re-check cond
if incr != "" {
s.execArithAssign(incr)
}
continue
}
return continueErr{ce.n - 1}
}
if _, ok := err.(returnErr); ok {
return err
}
}
// Execute increment
if incr != "" {
s.execArithAssign(incr)
}
}
return nil
}
// execArithAssign handles arithmetic assignment expressions like i=0, i++, i+=1, ((i++))
func (s *Shell) execArithAssign(expr string) {
expr = strings.TrimSpace(expr)
if expr == "" {
return
}
// Handle i++ and i--
if strings.HasSuffix(expr, "++") {
varName := strings.TrimSpace(expr[:len(expr)-2])
if isValidIdentifier(varName) {
n := s.evalArith(varName)
s.vars[varName] = fmt.Sprintf("%d", n+1)
return
}
}
if strings.HasSuffix(expr, "--") {
varName := strings.TrimSpace(expr[:len(expr)-2])
if isValidIdentifier(varName) {
n := s.evalArith(varName)
s.vars[varName] = fmt.Sprintf("%d", n-1)
return
}
}
// Handle i+=N
if idx := strings.Index(expr, "+="); idx > 0 {
varName := strings.TrimSpace(expr[:idx])
if isValidIdentifier(varName) {
delta := s.evalArith(expr[idx+2:])
n := s.evalArith(varName)
s.vars[varName] = fmt.Sprintf("%d", n+delta)
return
}
}
// Handle i-=N
if idx := strings.Index(expr, "-="); idx > 0 {
varName := strings.TrimSpace(expr[:idx])
if isValidIdentifier(varName) {
delta := s.evalArith(expr[idx+2:])
n := s.evalArith(varName)
s.vars[varName] = fmt.Sprintf("%d", n-delta)
return
}
}
// Handle i=expr
if idx := strings.Index(expr, "="); idx > 0 {
varName := strings.TrimSpace(expr[:idx])
if isValidIdentifier(varName) {
n := s.evalArith(expr[idx+1:])
s.vars[varName] = fmt.Sprintf("%d", n)
return
}
}
}
// executeWhileUntil handles while/until loops.
func (s *Shell) executeWhileUntil(block string, isUntil bool) error {
stmts := splitStatements(block)

97
internal/shell/exec.go
View File

@@ -70,7 +70,10 @@ func splitPipe(input string) []string {
current.WriteByte(c)
case c == '|' && !inSingle && !inDouble && parenDepth == 0:
if i+1 < len(input) && input[i+1] == '|' {
current.WriteByte(c) // part of ||, pass through
// || operator — pass both chars through
current.WriteByte(c)
current.WriteByte(input[i+1])
i++
} else {
parts = append(parts, strings.TrimSpace(current.String()))
current.Reset()
@@ -87,6 +90,63 @@ func splitPipe(input string) []string {
return parts
}
// parseArrayAssign detects NAME=(...) or NAME+=(...) at start of input.
func (s *Shell) parseArrayAssign(input string) (name string, appendMode bool, elements []string, ok bool) {
input = strings.TrimSpace(input)
// Read identifier
i := 0
for i < len(input) && isVarChar(input[i]) {
i++
}
if i == 0 {
return
}
name = input[:i]
if !isValidIdentifier(name) {
return
}
// Optional +
if i < len(input) && input[i] == '+' {
appendMode = true
i++
}
// Require =
if i >= len(input) || input[i] != '=' {
return
}
i++
// Require (
if i >= len(input) || input[i] != '(' {
return
}
i++
// Find matching )
depth := 1
j := i
inSingle := false
inDouble := false
for j < len(input) && depth > 0 {
c := input[j]
switch {
case c == '\'' && !inDouble:
inSingle = !inSingle
case c == '"' && !inSingle:
inDouble = !inDouble
case c == '(' && !inSingle && !inDouble:
depth++
case c == ')' && !inSingle && !inDouble:
depth--
}
if depth > 0 {
j++
}
}
content := input[i:j]
elements = s.tokenize(content)
ok = true
return
}
// executeCommand executes a single command (no pipes, no &&/||).
func (s *Shell) executeCommand(input string) error {
input = strings.TrimSpace(input)
@@ -94,12 +154,22 @@ func (s *Shell) executeCommand(input string) error {
return nil
}
// Detect array assignment NAME=(...) or NAME+=(...)
if name, appendMode, elems, ok := s.parseArrayAssign(input); ok {
if appendMode {
s.appendArray(name, elems)
} else {
s.setArray(name, elems)
}
return nil
}
tokens := s.tokenize(input)
if len(tokens) == 0 {
return nil
}
cmdArgs, redirects := extractRedirects(tokens)
cmdArgs, redirects := s.extractRedirects(tokens)
if len(cmdArgs) == 0 {
// Pure redirection, e.g. "> file" creates/truncates file
return s.withRedirects(redirects, func() error { return nil })
@@ -132,7 +202,7 @@ func (s *Shell) executeCommand(input string) error {
})
}
func extractRedirects(tokens []string) ([]string, []redirect) {
func (s *Shell) extractRedirects(tokens []string) ([]string, []redirect) {
var args []string
var redirects []redirect
@@ -194,11 +264,24 @@ func extractRedirects(tokens []string) ([]string, []redirect) {
case strings.HasPrefix(tok, ">") && len(tok) > 1:
redirects = append(redirects, redirect{1, ">", tok[1:]})
i++
// < (stdin)
// < (stdin) — also handle process substitution <(...)
case tok == "<":
if i+1 < len(tokens) {
redirects = append(redirects, redirect{0, "<", tokens[i+1]})
i += 2
next := tokens[i+1]
// Process substitution: < <(cmd)
if strings.HasPrefix(next, "<(") && strings.HasSuffix(next, ")") {
cmd := next[2 : len(next)-1]
tmpf, err := os.CreateTemp("", "procsub*")
if err == nil {
s.withIO(nil, tmpf, nil, func() error { return s.Execute(cmd) })
tmpf.Close()
redirects = append(redirects, redirect{0, "<", tmpf.Name()})
}
i += 2
} else {
redirects = append(redirects, redirect{0, "<", next})
i += 2
}
} else {
i++
}
@@ -296,7 +379,7 @@ func (s *Shell) executeCommandBg(input string) error {
if len(tokens) == 0 {
return nil
}
cmdArgs, _ := extractRedirects(tokens)
cmdArgs, _ := s.extractRedirects(tokens)
if len(cmdArgs) == 0 {
return nil
}

223
internal/shell/expand.go
View File

@@ -60,7 +60,17 @@ func (s *Shell) expandWord(word string) string {
i += 2
}
} else {
result.WriteByte(next)
// Only consume the backslash when escaping a shell
// metacharacter. Before regular path characters (letters,
// digits, etc.) keep it literal so Windows paths like
// C:\workspace work unquoted.
const metachars = " \t\n$*?[\"'\\|&;()<>{}!#~`"
if strings.ContainsRune(metachars, rune(next)) {
result.WriteByte(next)
} else {
result.WriteByte('\\')
result.WriteByte(next)
}
i += 2
}
} else {
@@ -72,6 +82,82 @@ func (s *Shell) expandWord(word string) string {
result.WriteByte('$')
break
}
// $'...' ANSI C string
if word[i] == '\'' {
i++ // skip opening '
for i < len(word) && word[i] != '\'' {
if word[i] == '\\' && i+1 < len(word) {
i++ // skip backslash, now at escape char
switch word[i] {
case 'n':
result.WriteByte('\n')
case 't':
result.WriteByte('\t')
case 'r':
result.WriteByte('\r')
case '\\':
result.WriteByte('\\')
case '\'':
result.WriteByte('\'')
case '"':
result.WriteByte('"')
case 'a':
result.WriteByte('\a')
case 'b':
result.WriteByte('\b')
case 'f':
result.WriteByte('\f')
case 'v':
result.WriteByte('\v')
case 'e', 'E':
result.WriteByte(0x1b)
case '0', '1', '2', '3', '4', '5', '6', '7':
// Octal \NNN — up to 3 digits
oct := 0
for k := 0; k < 3 && i < len(word) && word[i] >= '0' && word[i] <= '7'; k++ {
oct = oct*8 + int(word[i]-'0')
i++
}
result.WriteByte(byte(oct))
continue
case 'x':
// Hex \xNN — up to 2 digits
i++ // skip 'x'
hexv := 0
for k := 0; k < 2 && i < len(word); k++ {
d := word[i]
if d >= '0' && d <= '9' {
hexv = hexv*16 + int(d-'0')
i++
} else if d >= 'a' && d <= 'f' {
hexv = hexv*16 + int(d-'a'+10)
i++
} else if d >= 'A' && d <= 'F' {
hexv = hexv*16 + int(d-'A'+10)
i++
} else {
break
}
}
result.WriteByte(byte(hexv))
continue
default:
result.WriteByte('\\')
result.WriteByte(word[i])
}
i++
} else {
result.WriteByte(word[i])
i++
}
}
if i < len(word) {
i++ // skip closing '
}
continue
}
switch word[i] {
case '(':
if i+1 < len(word) && word[i+1] == '(' {
@@ -146,7 +232,7 @@ func (s *Shell) expandWord(word string) string {
result.WriteString(s.vars["#"])
i++
case '@':
result.WriteString(s.vars["@"])
result.WriteString(strings.Join(s.args, "\x01"))
i++
case '*':
result.WriteString(s.vars["*"])
@@ -172,17 +258,52 @@ func (s *Shell) expandWord(word string) string {
}
func (s *Shell) getVar(name string) string {
if v, ok := s.vars[name]; ok {
// Resolve nameref chain
resolved := s.resolveNR(name)
if v, ok := s.vars[resolved]; ok {
return v
}
return os.Getenv(name)
return os.Getenv(resolved)
}
func (s *Shell) evalVarExpr(expr string) string {
// ${#VAR} — string length
// ${#arr[@]} or ${#arr[*]} → length of array
if strings.HasPrefix(expr, "#") {
return strconv.Itoa(len(s.getVar(expr[1:])))
rest := expr[1:]
if strings.HasSuffix(rest, "[@]") || strings.HasSuffix(rest, "[*]") {
arrName := rest[:len(rest)-3]
return strconv.Itoa(len(s.getArray(arrName)))
}
// ${#VAR} — string length
return strconv.Itoa(len(s.getVar(rest)))
}
// Array indexing: ${arr[@]}, ${arr[*]}, ${arr[N]}
if bracketIdx := strings.Index(expr, "["); bracketIdx >= 0 && strings.HasSuffix(expr, "]") {
// Make sure there's no operator before the bracket
prefix := expr[:bracketIdx]
hasOp := strings.ContainsAny(prefix, ":-:=:+%#")
if !hasOp {
arrName := prefix
idx := expr[bracketIdx+1 : len(expr)-1]
if idx == "@" {
arr := s.getArray(arrName)
return strings.Join(arr, "\x01")
}
if idx == "*" {
arr := s.getArray(arrName)
return strings.Join(arr, " ")
}
// Numeric index
n := s.evalArith(idx)
arr := s.getArray(arrName)
if n >= 0 && n < len(arr) {
return arr[n]
}
return ""
}
}
// ${VAR:-default}
if idx := strings.Index(expr, ":-"); idx >= 0 {
varName := expr[:idx]
@@ -285,7 +406,48 @@ func evalArithExpr(expr string) int {
if strings.HasPrefix(expr, "(") && strings.HasSuffix(expr, ")") {
return evalArithExpr(expr[1 : len(expr)-1])
}
// Operators in precedence order (lowest first so we split on last occurrence)
// Comparison operators (lowest precedence) — multi-char first
for _, op := range []string{"<=", ">=", "==", "!=", "<", ">"} {
if idx := findBinaryOpStr(expr, op); idx >= 0 {
left := evalArithExpr(expr[:idx])
right := evalArithExpr(expr[idx+len(op):])
switch op {
case "<":
if left < right {
return 1
}
return 0
case ">":
if left > right {
return 1
}
return 0
case "<=":
if left <= right {
return 1
}
return 0
case ">=":
if left >= right {
return 1
}
return 0
case "==":
if left == right {
return 1
}
return 0
case "!=":
if left != right {
return 1
}
return 0
}
}
}
// Arithmetic operators in precedence order (lowest first so we split on last occurrence)
for _, op := range []string{"+", "-", "*", "/", "%"} {
if idx := findBinaryOp(expr, op); idx >= 0 {
left := evalArithExpr(expr[:idx])
@@ -313,6 +475,39 @@ func evalArithExpr(expr string) int {
return 0
}
// findBinaryOpStr finds the rightmost occurrence of a multi-character binary operator.
func findBinaryOpStr(expr, op string) int {
depth := 0
// Search right-to-left
for i := len(expr) - len(op); i >= 0; i-- {
switch expr[i] {
case ')':
depth++
case '(':
depth--
}
if depth != 0 {
continue
}
if expr[i:i+len(op)] == op {
// Make sure it's not part of a longer operator
// e.g. don't match < in <=
if len(op) == 1 {
// For < and >, make sure next char is not =
if i+1 < len(expr) && (expr[i+1] == '=' || (op == "<" && expr[i+1] == '<') || (op == ">" && expr[i+1] == '>')) {
continue
}
}
// For single char ops, make sure previous char is not the same op (e.g. << or >>)
if len(op) == 1 && i > 0 && expr[i-1] == expr[i] {
continue
}
return i
}
}
return -1
}
func findBinaryOp(expr, op string) int {
depth := 0
for i := len(expr) - 1; i >= 0; i-- {
@@ -353,7 +548,7 @@ func (s *Shell) tokenize(input string) []string {
current := strings.Builder{}
inSingle := false
inDouble := false
parenDepth := 0 // nesting depth inside $(...) or $((...))
parenDepth := 0 // nesting depth inside $(...) or $((...))
pendingDollar := false // true after $ when next char is (
wasQuoted := false
@@ -420,7 +615,7 @@ doneTokenizing:
if eqIdx := strings.Index(clean, "="); eqIdx > 0 {
name := clean[:eqIdx]
if isValidIdentifier(name) && !strings.Contains(clean[:eqIdx], "$") {
value := s.expandWord(clean[eqIdx+1:])
value := strings.ReplaceAll(s.expandWord(clean[eqIdx+1:]), "\x01", " ")
s.vars[name] = value
os.Setenv(name, value)
rawTokens = rawTokens[1:]
@@ -438,6 +633,16 @@ doneTokenizing:
tok = tok[2:]
}
expanded := s.expandWord(tok)
// Handle multi-word expansion from $@ and ${arr[@]}
if strings.Contains(expanded, "\x01") {
parts := strings.Split(expanded, "\x01")
for _, p := range parts {
if p != "" {
result = append(result, p)
}
}
continue
}
if !quoted && strings.ContainsAny(expanded, "*?[") {
result = append(result, s.expandGlob(expanded)...)
} else {

247
internal/shell/shell.go
View File

@@ -24,6 +24,8 @@ func (e exitCodeErr) Error() string { return "" }
type Shell struct {
vars map[string]string
arrays map[string][]string
namerefs map[string]string
builtins map[string]func([]string) error
funcs map[string]string // function name → body
lastExit int
@@ -31,15 +33,20 @@ type Shell struct {
Stdout io.Writer
Stderr io.Writer
args []string
errexit bool
nounset bool
pipefail bool
}
func New() *Shell {
s := &Shell{
vars: map[string]string{},
funcs: map[string]string{},
Stdin: os.Stdin,
Stdout: os.Stdout,
Stderr: os.Stderr,
vars: map[string]string{},
arrays: map[string][]string{},
namerefs: map[string]string{},
funcs: map[string]string{},
Stdin: os.Stdin,
Stdout: os.Stdout,
Stderr: os.Stderr,
}
s.initBuiltins()
s.vars["SHELL"] = "bash-for-windows"
@@ -58,6 +65,38 @@ func New() *Shell {
return s
}
// resolveNR resolves a variable name through the nameref chain (circular-ref safe).
func (s *Shell) resolveNR(name string) string {
seen := map[string]bool{}
for {
if seen[name] {
return name
}
seen[name] = true
target, ok := s.namerefs[name]
if !ok {
return name
}
name = target
}
}
// getArray returns array (resolving namerefs).
func (s *Shell) getArray(name string) []string {
return s.arrays[s.resolveNR(name)]
}
// setArray sets array (resolving namerefs).
func (s *Shell) setArray(name string, vals []string) {
s.arrays[s.resolveNR(name)] = vals
}
// appendArray appends to array (resolving namerefs).
func (s *Shell) appendArray(name string, vals []string) {
n := s.resolveNR(name)
s.arrays[n] = append(s.arrays[n], vals...)
}
func (s *Shell) SetArgs(args []string) {
s.args = args
s.vars["#"] = fmt.Sprintf("%d", len(args))
@@ -81,7 +120,12 @@ func (s *Shell) SetVar(name, value string) {
// Execute runs commands from the given input string.
func (s *Shell) Execute(input string) error {
// Normalize CRLF to LF
input = strings.ReplaceAll(input, "\r\n", "\n")
input = strings.ReplaceAll(input, "\r", "\n")
input = strings.ReplaceAll(input, "\\\n", " ")
// Pre-process heredocs
input = preprocessHeredocs(input)
blocks := parseBlocks(input)
for _, block := range blocks {
if err := s.executeBlock(block); err != nil {
@@ -119,7 +163,7 @@ func IsIncomplete(input string) bool {
for _, stmt := range stmts {
w := firstWord(stmt)
switch w {
case "if", "for", "while", "until":
case "if", "for", "while", "until", "case":
depth++
case "fi", "done", "esac":
depth--
@@ -162,7 +206,7 @@ func parseBlocks(input string) []string {
funcKwDepth = 0
for _, p := range splitStatements(stmt[braceIdx+1:]) {
switch firstWord(p) {
case "if", "for", "while", "until":
case "if", "for", "while", "until", "case":
funcKwDepth++
case "fi", "done", "esac":
funcKwDepth--
@@ -182,7 +226,7 @@ func parseBlocks(input string) []string {
}
switch w {
case "if", "for", "while", "until":
case "if", "for", "while", "until", "case":
kwDepth++
}
kwDepth += embeddedKwDepth(stmt)
@@ -211,7 +255,7 @@ func parseBlocks(input string) []string {
continue
}
switch w {
case "if", "for", "while", "until":
case "if", "for", "while", "until", "case":
funcKwDepth++
case "fi", "done", "esac":
funcKwDepth--
@@ -246,23 +290,178 @@ func embeddedKwDepth(stmt string) int {
return delta
}
// splitStatements splits input on semicolons and newlines, respecting quotes.
// preprocessHeredocs converts heredoc syntax (<<MARKER) to temp-file redirects.
// It processes the input line by line, detecting <<MARKER, collecting the body,
// writing it to a temp file, and replacing <<MARKER with < /tmp/file.
func preprocessHeredocs(input string) string {
lines := strings.Split(input, "\n")
var result []string
i := 0
for i < len(lines) {
line := lines[i]
// Check for heredoc marker in this line: <<MARKER or <<-MARKER or <<"MARKER" or <<'MARKER'
// Find all heredoc markers on this line (there could be multiple)
processed, markers := parseHeredocMarkers(line)
if len(markers) == 0 {
result = append(result, line)
i++
continue
}
// Collect heredoc bodies for each marker
i++
newLine := processed
for _, marker := range markers {
stripTabs := strings.HasPrefix(marker, "-")
if stripTabs {
marker = marker[1:]
}
// Strip quotes from marker
quotedMarker := marker
if len(marker) >= 2 && ((marker[0] == '\'' && marker[len(marker)-1] == '\'') ||
(marker[0] == '"' && marker[len(marker)-1] == '"')) {
marker = marker[1 : len(marker)-1]
}
_ = quotedMarker
// Collect body until marker
var bodyLines []string
for i < len(lines) {
bodyLine := lines[i]
check := bodyLine
if stripTabs {
check = strings.TrimLeft(check, "\t")
}
if strings.TrimRight(check, "\r") == marker {
i++
break
}
bodyLines = append(bodyLines, bodyLine)
i++
}
// Write to temp file
content := strings.Join(bodyLines, "\n")
if len(bodyLines) > 0 {
content += "\n"
}
f, err := os.CreateTemp("", "heredoc*")
if err == nil {
f.WriteString(content)
f.Close()
newLine += " < " + f.Name()
}
}
result = append(result, newLine)
}
return strings.Join(result, "\n")
}
// parseHeredocMarkers finds <<MARKER patterns in a line and returns the line with
// the heredoc redirects removed (replaced), plus the list of markers found.
func parseHeredocMarkers(line string) (string, []string) {
var markers []string
var out strings.Builder
i := 0
inSingle := false
inDouble := false
for i < len(line) {
c := line[i]
switch {
case c == '\'' && !inDouble:
inSingle = !inSingle
out.WriteByte(c)
i++
case c == '"' && !inSingle:
inDouble = !inDouble
out.WriteByte(c)
i++
case c == '<' && !inSingle && !inDouble && i+1 < len(line) && line[i+1] == '<':
// Possible heredoc
i += 2 // skip <<
stripTabs := false
if i < len(line) && line[i] == '-' {
stripTabs = true
i++
}
// Skip spaces after <<
for i < len(line) && line[i] == ' ' {
i++
}
// Read the marker (may be quoted)
marker := ""
if i < len(line) && (line[i] == '\'' || line[i] == '"') {
quote := line[i]
i++
for i < len(line) && line[i] != quote {
marker += string(line[i])
i++
}
if i < len(line) {
i++ // skip closing quote
}
} else {
// Unquoted marker
for i < len(line) && line[i] != ' ' && line[i] != '\t' && line[i] != ';' && line[i] != '|' && line[i] != '&' && line[i] != '>' && line[i] != '<' {
marker += string(line[i])
i++
}
}
if marker != "" {
if stripTabs {
markers = append(markers, "-"+marker)
} else {
markers = append(markers, marker)
}
// Don't write the <<MARKER to output; it will be replaced by < file
}
default:
out.WriteByte(c)
i++
}
}
return out.String(), markers
}
// splitStatements splits input on semicolons and newlines, respecting quotes and ((...)).
// Double semicolons ;; are preserved as a single token (for case statements).
func splitStatements(input string) []string {
var result []string
current := strings.Builder{}
inSingle := false
inDouble := false
parenDepth := 0
for i := 0; i < len(input); i++ {
c := input[i]
switch {
case c == '\'' && !inDouble:
case c == '\'' && !inDouble && parenDepth == 0:
inSingle = !inSingle
current.WriteByte(c)
case c == '"' && !inSingle:
case c == '"' && !inSingle && parenDepth == 0:
inDouble = !inDouble
current.WriteByte(c)
case (c == ';' || c == '\n') && !inSingle && !inDouble:
case c == '(' && !inSingle && !inDouble:
parenDepth++
current.WriteByte(c)
case c == ')' && !inSingle && !inDouble && parenDepth > 0:
parenDepth--
current.WriteByte(c)
case c == ';' && !inSingle && !inDouble && parenDepth == 0:
if i+1 < len(input) && input[i+1] == ';' {
// Double semicolon — flush current token, then emit ";;" as a token
if s := strings.TrimSpace(current.String()); s != "" {
result = append(result, s)
}
current.Reset()
result = append(result, ";;")
i++ // skip second ;
} else {
// Single semicolon — just a statement separator
if s := strings.TrimSpace(current.String()); s != "" {
result = append(result, s)
}
current.Reset()
}
case c == '\n' && !inSingle && !inDouble && parenDepth == 0:
if s := strings.TrimSpace(current.String()); s != "" {
result = append(result, s)
}
@@ -338,11 +537,18 @@ func (s *Shell) executeBlock(block string) error {
case "if":
return s.executeIf(block)
case "for":
// Check for C-style for (( ... ))
trimmed := strings.TrimSpace(block)
if strings.HasPrefix(trimmed, "for ((") || strings.HasPrefix(trimmed, "for((") {
return s.executeForC(block)
}
return s.executeFor(block)
case "while":
return s.executeWhileUntil(block, false)
case "until":
return s.executeWhileUntil(block, true)
case "case":
return s.executeCase(block)
}
if isFuncDefStart(block) {
return s.defineFunction(block)
@@ -418,6 +624,7 @@ func (s *Shell) executeAndOrList(line string) error {
op := ""
inSingle := false
inDouble := false
dbDepth := 0 // double-bracket [[ depth
for i := 0; i < len(line); i++ {
c := line[i]
@@ -428,12 +635,22 @@ func (s *Shell) executeAndOrList(line string) error {
case c == '"' && !inSingle:
inDouble = !inDouble
current.WriteByte(c)
case c == '&' && !inSingle && !inDouble && i+1 < len(line) && line[i+1] == '&':
case c == '[' && !inSingle && !inDouble && i+1 < len(line) && line[i+1] == '[':
dbDepth++
current.WriteByte(c)
current.WriteByte(line[i+1])
i++
case c == ']' && !inSingle && !inDouble && i+1 < len(line) && line[i+1] == ']' && dbDepth > 0:
dbDepth--
current.WriteByte(c)
current.WriteByte(line[i+1])
i++
case c == '&' && !inSingle && !inDouble && i+1 < len(line) && line[i+1] == '&' && dbDepth == 0:
tokens = append(tokens, tok{current.String(), op})
current.Reset()
op = "&&"
i++
case c == '|' && !inSingle && !inDouble && i+1 < len(line) && line[i+1] == '|':
case c == '|' && !inSingle && !inDouble && i+1 < len(line) && line[i+1] == '|' && dbDepth == 0:
tokens = append(tokens, tok{current.String(), op})
current.Reset()
op = "||"