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package mousetrap
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import (
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	"syscall"
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	"unsafe"
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)
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func getProcessEntry(pid int) (*syscall.ProcessEntry32, error) {
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	snapshot, err := syscall.CreateToolhelp32Snapshot(syscall.TH32CS_SNAPPROCESS, 0)
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	if err != nil {
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		return nil, err
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	}
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	defer syscall.CloseHandle(snapshot)
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	var procEntry syscall.ProcessEntry32
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	procEntry.Size = uint32(unsafe.Sizeof(procEntry))
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	if err = syscall.Process32First(snapshot, &procEntry); err != nil {
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		return nil, err
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	}
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	for {
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		if procEntry.ProcessID == uint32(pid) {
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			return &procEntry, nil
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		}
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		err = syscall.Process32Next(snapshot, &procEntry)
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		if err != nil {
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			return nil, err
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		}
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	}
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}
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// StartedByExplorer returns true if the program was invoked by the user double-clicking
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// on the executable from explorer.exe
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//
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// It is conservative and returns false if any of the internal calls fail.
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// It does not guarantee that the program was run from a terminal. It only can tell you
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// whether it was launched from explorer.exe
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func StartedByExplorer() bool {
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	pe, err := getProcessEntry(syscall.Getppid())
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	if err != nil {
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		return false
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	}
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	return "explorer.exe" == syscall.UTF16ToString(pe.ExeFile[:])
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}
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