Changes to browser.go. All files

browser.go

new file mode 100644@@ -0,0 +1,57 @@+package main++import (+	"fmt"+	"net/netip"+	neturl "net/url"+	"os"+	"os/exec"+	"strings"+)++// openBrowser opens url when a display exists. Over SSH there is none, and+// the printed URL has to do.+func openBrowser(url string) {+	if os.Getenv("DISPLAY") == "" && os.Getenv("WAYLAND_DISPLAY") == "" {+		return+	}+	args := openArgs(url, os.Getenv(openEnv))+	cmd := exec.Command(args[0], args[1:]...)+	if err := cmd.Start(); err != nil {+		fmt.Fprintf(os.Stderr, "E%d: cannot open %s with %s: %v\n", errnoOf(err), url, args[0], err)+		return+	}+	go cmd.Wait()+}++// openArgs is the command that opens url. A loopback URL takes WWW_OPEN,+// split at spaces, with each %s replaced by the URL, or the URL appended+// when none holds %s; eg 'brave-browser --app=%s' opens an app window. A+// shared URL, and any URL without the variable, goes to xdg-open.+func openArgs(url, open string) []string {+	fields := strings.Fields(open)+	if len(fields) == 0 || !loopbackURL(url) {+		return []string{"xdg-open", url}+	}+	placed := false+	for i, f := range fields {+		if strings.Contains(f, "%s") {+			fields[i] = strings.ReplaceAll(f, "%s", url)+			placed = true+		}+	}+	if !placed {+		fields = append(fields, url)+	}+	return fields+}++// loopbackURL reports whether u names a loopback host.+func loopbackURL(u string) bool {+	p, err := neturl.Parse(u)+	if err != nil {+		return false+	}+	a, err := netip.ParseAddr(p.Hostname())+	return err == nil && a.IsLoopback() || p.Hostname() == "localhost"+}