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shell_windows.go
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shell_windows.go
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package shell
import (
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
"syscall"
"unsafe"
)
// re-implementation of private function in https://github.com/golang/go/blob/master/src/syscall/syscall_windows.go#L945
func getProcessEntry(pid int) (pe *syscall.ProcessEntry32, err error) {
snapshot, err := syscall.CreateToolhelp32Snapshot(syscall.TH32CS_SNAPPROCESS, 0)
if err != nil {
return nil, err
}
defer syscall.CloseHandle(syscall.Handle(snapshot))
var processEntry syscall.ProcessEntry32
processEntry.Size = uint32(unsafe.Sizeof(processEntry))
err = syscall.Process32First(snapshot, &processEntry)
if err != nil {
return nil, err
}
for {
if processEntry.ProcessID == uint32(pid) {
pe = &processEntry
return
}
err = syscall.Process32Next(snapshot, &processEntry)
if err != nil {
return nil, err
}
}
}
// getNameAndItsPpid returns the exe file name its parent process id.
func getNameAndItsPpid(pid int) (exefile string, parentid int, err error) {
pe, err := getProcessEntry(pid)
if err != nil {
return "", 0, err
}
name := syscall.UTF16ToString(pe.ExeFile[:])
return name, int(pe.ParentProcessID), nil
}
func Detect() (string, error) {
shell := os.Getenv("SHELL")
// if you spawn a Powershell instance from CMD, sometimes the SHELL environment variable still points to CMD in the Powershell instance
// so if SHELL is pointing to CMD, let's do extra work to get the correct shell
if shell == "" || filepath.Base(shell) == "cmd.exe" {
shell, shellppid, err := getNameAndItsPpid(os.Getppid())
if err != nil {
return "cmd", err // defaulting to cmd
}
shellMapping := mapShell(shell)
if shellMapping != "" {
return shellMapping, nil
} else {
shell, _, err := getNameAndItsPpid(shellppid)
if err != nil {
return "cmd", err // defaulting to cmd
}
shellMapping = mapShell(shell)
if shellMapping != "" {
return shellMapping, nil
} else {
fmt.Printf("You can further specify your shell with either 'cmd' or 'powershell' with the --shell flag.\n\n")
return "cmd", nil // this could be either powershell or cmd, defaulting to cmd
}
}
}
if os.Getenv("__fish_bin_dir") != "" {
return "fish", nil
}
if runtime.GOOS == "windows" {
shell = strings.TrimSuffix(shell, filepath.Ext(shell))
}
return filepath.Base(shell), nil
}
func mapShell(shell string) string {
mappings := map[string]string{
"cmd": "cmd",
"powershell": "powershell",
"pwsh": "powershell",
}
for k, v := range mappings {
if strings.Contains(strings.ToLower(shell), k) {
return v
}
}
return ""
}