63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
package update
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import (
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"fmt"
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"os"
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"path/filepath"
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ptr "unsafe"
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"golang.org/x/sys/windows"
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"golang.org/x/sys/windows/registry"
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)
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// installedShells are PowerShell and cmd, which both take the registry's
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// PATH (proc.ShellPath).
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func installedShells() []cliShell {
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return []cliShell{{Name: "PowerShell", Default: true}, {Name: "cmd"}}
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}
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// cliDir is the app's own folder, put first in the user's PATH: a link
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// needs Developer Mode or an administrator, and a copy wouldn't follow
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// the app's updates.
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func cliDir(exe string, _ []string, _ string) string { return filepath.Dir(exe) }
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// cliPlace puts dir first in the user's PATH in the registry, where a
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// terminal opened from now on takes it up, and tells Explorer.
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func cliPlace(_, dir string) error {
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k, err := registry.OpenKey(registry.CURRENT_USER, `Environment`, registry.QUERY_VALUE|registry.SET_VALUE)
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if err != nil {
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return err
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}
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defer k.Close()
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v, typ, err := k.GetStringValue("Path")
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if err != nil && err != registry.ErrNotExist {
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return err
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}
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nv := pathFirst(v, dir)
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if nv == v {
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return nil
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}
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// kept REG_EXPAND_SZ, as Windows has it, so %USERPROFILE% in it still works
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if err == registry.ErrNotExist || typ == registry.EXPAND_SZ {
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err = k.SetExpandStringValue("Path", nv)
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} else {
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err = k.SetStringValue("Path", nv)
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}
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if err != nil {
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return fmt.Errorf("adding %s to your PATH: %w", dir, err)
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}
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os.Setenv("PATH", dir+";"+os.Getenv("PATH"))
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settingChanged()
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return nil
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}
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// settingChanged tells Explorer the environment changed, so what it starts
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// next — a terminal from the Start menu — has the new PATH.
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func settingChanged() {
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const hwndBroadcast, wmSettingChange, smtoAbortIfHung = 0xffff, 0x001A, 0x0002
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env, _ := windows.UTF16PtrFromString("Environment")
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var res uintptr
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windows.NewLazySystemDLL("user32.dll").NewProc("SendMessageTimeoutW").Call(
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hwndBroadcast, wmSettingChange, 0, uintptr(ptr.Pointer(env)), smtoAbortIfHung, 5000, uintptr(ptr.Pointer(&res)))
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}
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