antidrift/internal/winapi/class.go

// Package winapi is the Windows Win32 binding layer for Keel's OS ports.
// The syscall-bound code lives in windows-tagged files; this untagged file
// holds the pure path logic so it builds and is tested on every platform.
package winapi

import "strings"

// ClassFromImagePath derives the on-task class identity from a process image
// path: the base file name with any trailing ".exe" removed (case-insensitive),
// lowercased. It is the Windows analog of an X11 WM_CLASS. It parses both `\`
// and `/` separators so it is correct regardless of the host OS running the
// test. Returns "" for an empty path.
func ClassFromImagePath(p string) string {
	if i := strings.LastIndexAny(p, `\/`); i >= 0 {
		p = p[i+1:]
	}
	const exeSuffix = ".exe"
	if len(p) >= len(exeSuffix) && strings.EqualFold(p[len(p)-len(exeSuffix):], exeSuffix) {
		p = p[:len(p)-len(exeSuffix)]
	}
	return strings.ToLower(p)
}