Cthulhu is no longer a fork. Now it is a screen reader written in Golang.

internal/shortcutui/ui.go

@@ -0,0 +1,55 @@
+package shortcutui
+
+/*
+#cgo pkg-config: gtk+-3.0
+#include <stdlib.h>
+int shortcut_ui_open(const char *title, const char **groups, const char **labels, const char **keys, int count);
+*/
+import "C"
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"runtime"
+	"unsafe"
+)
+
+type Row struct {
+	Group string `json:"group"`
+	Label string `json:"label"`
+	Keys  string `json:"keys"`
+}
+
+type List struct {
+	Title string `json:"title"`
+	Rows  []Row  `json:"rows"`
+}
+
+// Run displays one read-only, keyboard accessible shortcut list in a child process.
+func Run(reader io.Reader) error {
+	var list List
+	if err := json.NewDecoder(io.LimitReader(reader, 1<<20)).Decode(&list); err != nil {
+		return err
+	}
+	if len(list.Rows) == 0 || len(list.Rows) > 512 {
+		return errors.New("invalid shortcut list")
+	}
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	title := C.CString(list.Title)
+	defer C.free(unsafe.Pointer(title))
+	groups := make([]*C.char, len(list.Rows))
+	labels := make([]*C.char, len(list.Rows))
+	keys := make([]*C.char, len(list.Rows))
+	for i, row := range list.Rows {
+		groups[i], labels[i], keys[i] = C.CString(row.Group), C.CString(row.Label), C.CString(row.Keys)
+		defer C.free(unsafe.Pointer(groups[i]))
+		defer C.free(unsafe.Pointer(labels[i]))
+		defer C.free(unsafe.Pointer(keys[i]))
+	}
+	if C.shortcut_ui_open(title, (**C.char)(unsafe.Pointer(&groups[0])), (**C.char)(unsafe.Pointer(&labels[0])), (**C.char)(unsafe.Pointer(&keys[0])), C.int(len(list.Rows))) == 0 {
+		return errors.New("could not open shortcut list window")
+	}
+	return nil
+}