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//go:build windows
package util
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"sync/atomic"
"syscall"
)
type shellType int
const (
shellTypeUnknown shellType = iota
shellTypeCmd
shellTypePowerShell
)
var escapeRegex = regexp.MustCompile(`[&|<>()^%!"]`)
type Executor struct {
shell string
shellType shellType
args []string
shellPath atomic.Value
}
func NewExecutor(withShell string) *Executor {
shell := os.Getenv("SHELL")
args := strings.Fields(withShell)
if len(args) > 0 {
shell = args[0]
} else if len(shell) == 0 {
shell = "cmd"
}
shellType := shellTypeUnknown
basename := filepath.Base(shell)
if len(args) > 0 {
args = args[1:]
} else if strings.HasPrefix(basename, "cmd") {
shellType = shellTypeCmd
args = []string{"/s/c"}
} else if strings.HasPrefix(basename, "pwsh") || strings.HasPrefix(basename, "powershell") {
shellType = shellTypePowerShell
args = []string{"-NoProfile", "-Command"}
} else {
args = []string{"-c"}
}
return &Executor{shell: shell, shellType: shellType, args: args}
}
// ExecCommand executes the given command with $SHELL
// FIXME: setpgid is unused. We set it in the Unix implementation so that we
// can kill preview process with its child processes at once.
// NOTE: For "powershell", we should ideally set output encoding to UTF8,
// but it is left as is now because no adverse effect has been observed.
func (x *Executor) ExecCommand(command string, setpgid bool) *exec.Cmd {
shell := x.shell
if cached := x.shellPath.Load(); cached != nil {
shell = cached.(string)
} else {
if strings.Contains(shell, "/") {
out, err := exec.Command("cygpath", "-w", shell).Output()
if err == nil {
shell = strings.Trim(string(out), "\n")
}
}
x.shellPath.Store(shell)
}
var cmd *exec.Cmd
if x.shellType == shellTypeCmd {
cmd = exec.Command(shell)
cmd.SysProcAttr = &syscall.SysProcAttr{
HideWindow: false,
CmdLine: fmt.Sprintf(`%s "%s"`, strings.Join(x.args, " "), command),
CreationFlags: 0,
}
} else {
cmd = exec.Command(shell, append(x.args, command)...)
cmd.SysProcAttr = &syscall.SysProcAttr{
HideWindow: false,
CreationFlags: 0,
}
}
return cmd
}
func (x *Executor) Become(stdin *os.File, environ []string, command string) {
cmd := x.ExecCommand(command, false)
cmd.Stdin = stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Env = environ
err := cmd.Start()
if err != nil {
fmt.Fprintf(os.Stderr, "fzf (become): %s\n", err.Error())
os.Exit(127)
}
err = cmd.Wait()
if err != nil {
if exitError, ok := err.(*exec.ExitError); ok {
os.Exit(exitError.ExitCode())
}
}
os.Exit(0)
}
func escapeArg(s string) string {
b := make([]byte, 0, len(s)+2)
b = append(b, '"')
slashes := 0
for i := 0; i < len(s); i++ {
c := s[i]
switch c {
default:
slashes = 0
case '\\':
slashes++
case '"':
for ; slashes > 0; slashes-- {
b = append(b, '\\')
}
b = append(b, '\\')
}
b = append(b, c)
}
for ; slashes > 0; slashes-- {
b = append(b, '\\')
}
b = append(b, '"')
return escapeRegex.ReplaceAllStringFunc(string(b), func(match string) string {
return "^" + match
})
}
func (x *Executor) QuoteEntry(entry string) string {
switch x.shellType {
case shellTypeCmd:
/* Manually tested with the following commands:
fzf --preview "echo {}"
fzf --preview "type {}"
echo .git\refs\| fzf --preview "dir {}"
echo .git\refs\\| fzf --preview "dir {}"
echo .git\refs\\\| fzf --preview "dir {}"
reg query HKCU | fzf --reverse --bind "enter:reload(reg query {})"
fzf --disabled --preview "echo {q} {n} {}" --query "&|<>()@^%!"
fd -H --no-ignore -td -d 4 | fzf --preview "dir {}"
fd -H --no-ignore -td -d 4 | fzf --preview "eza {}" --preview-window up
fd -H --no-ignore -td -d 4 | fzf --preview "eza --color=always --tree --level=3 --icons=always {}"
fd -H --no-ignore -td -d 4 | fzf --preview ".\eza.exe --color=always --tree --level=3 --icons=always {}" --with-shell "powershell -NoProfile -Command"
*/
return escapeArg(entry)
case shellTypePowerShell:
escaped := strings.ReplaceAll(entry, `"`, `\"`)
return "'" + strings.ReplaceAll(escaped, "'", "''") + "'"
default:
return "'" + strings.ReplaceAll(entry, "'", "'\\''") + "'"
}
}
// KillCommand kills the process for the given command
func KillCommand(cmd *exec.Cmd) error {
return cmd.Process.Kill()
}
// IsWindows returns true on Windows
func IsWindows() bool {
return true
}
// SetNonblock executes syscall.SetNonblock on file descriptor
func SetNonblock(file *os.File, nonblock bool) {
syscall.SetNonblock(syscall.Handle(file.Fd()), nonblock)
}
// Read executes syscall.Read on file descriptor
func Read(fd int, b []byte) (int, error) {
return syscall.Read(syscall.Handle(fd), b)
}
func SetStdin(file *os.File) {
// No-op
}
|
