64 lines
1.6 KiB
Markdown
64 lines
1.6 KiB
Markdown
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# winpath
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An example of getting, setting, and broadcasting PATHs on Windows.
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This requires the `unsafe` package to use a syscall with special message poitners to update `PATH` without a reboot.
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It will also build without `unsafe`.
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```bash
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go build -tags unsafe -o winpath.exe
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```
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```bash
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winpath show
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%USERPROFILE%\AppData\Local\Microsoft\WindowsApps
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C:\Users\me\AppData\Local\Programs\Microsoft VS Code\bin
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%USERPROFILE%\go\bin
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C:\Users\me\AppData\Roaming\npm
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C:\Users\me\AppData\Local\Keybase\
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```
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```bash
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winpath append C:\someplace\special
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Run the following for changes to take affect immediately:
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PATH %PATH%;C:\someplace\special
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```
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```bash
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winpath prepend C:\someplace\special
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Run the following for changes to take affect immediately:
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PATH C:\someplace\special;%PATH%
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```
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```bash
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winpath remove C:\someplace\special
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```
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# Special Considerations
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Giving away the secret sauce right here:
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* `HWND_BROADCAST`
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* `WM_SETTINGCHANGE`
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This is essentially the snippet you need to have the HKCU and HKLM Environment registry keys propagated without rebooting:
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```go
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HWND_BROADCAST := uintptr(0xffff)
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WM_SETTINGCHANGE := uintptr(0x001A)
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_, _, err := syscall.
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NewLazyDLL("user32.dll").
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NewProc("SendMessageW").
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Call(HWND_BROADCAST, WM_SETTINGCHANGE, 0, uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("ENVIRONMENT"))))
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```
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* `os.Getenv("COMSPEC")`
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* `os.Getenv("SHELL")`
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If you check `SHELL` and it isn't empty, then you're probably in MINGW or some such.
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If that's empty but `COMSPEC` isn't, you can be reasonably sure that you're in cmd.exe or Powershell.
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