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#pragma once
#include <functional>
#include <vector>
#include <variant>
#include <unordered_map>
#include <memory>
#include "xutil.h"
class SeqMatcher {
public:
using Callback = std::function<void()>;
struct SymSequence {
std::vector<x::Keysym> syms;
Callback callback;
};
SeqMatcher(Display *dpy);
// Initialise with an initial list of sequences.
SeqMatcher(Display *dpy, std::vector<SymSequence> seqs);
// Register a key sequence
void addSequence(const std::vector<x::Keysym> &syms, Callback callback);
// Returns bel()-running callback if unrecognised sequence is given
std::optional<Callback> observe(const XKeyEvent &ev);
// Cancel any running sequence and restart from the beginning
void reset();
private:
struct Node;
using NodeMap = std::unordered_map<x::Keycode, std::unique_ptr<Node>>;
struct Node {
std::variant<NodeMap, Callback> v;
};
Display *const dpy;
Node rootNode;
Node *curNode = &rootNode;
};
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