Command search (F3 / Ctrl+Space), pie menus (Space: tools, Shift+Space: views), keys of your own, undo history, workspaces, select similar / loops / rings; (being made: the rest)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/commands.h

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+#pragma once
+// Commands: everything the app can do, by name. Found by typing (the command search, F3 or
+// Ctrl+Space), put on keys of your own (Keys and mouse), and offered round the mouse (pie menus).
+#include "icons.h"
+
+#include <imgui.h>
+
+#include <functional>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace fry {
+
+struct Command {
+    std::string id;    // (stays the same: what keys of your own are kept against)
+    std::string name;  // what it's called ("Round edges")
+    std::string group; // where it lives ("Shape", "View")
+    std::string keys;  // its own key, as shown ("B")
+    std::function<void()> run;
+    std::function<bool()> ok; // (can it be done now; none: always)
+    std::string words;        // more to find it by ("bevel chamfer")
+    bool usable() const { return !ok || ok(); }
+};
+
+// A key with what's held with it.
+struct Chord {
+    ImGuiKey key = ImGuiKey_None;
+    bool ctrl = false, shift = false, alt = false;
+    bool operator==(const Chord&) const = default;
+    explicit operator bool() const { return key != ImGuiKey_None; }
+};
+std::string chordName(const Chord& c);
+std::optional<Chord> parseChord(const std::string& text);
+// The chord pressed this frame (a key that isn't only Ctrl / Shift / Alt), or none.
+std::optional<Chord> pressedChord();
+
+// How well `query` fits a command (0: not at all): every word of it in the name, group or
+// words; the start of a word, and the name, count most.
+int commandScore(const Command& c, const std::string& query);
+
+// The command search: a box to type in and the commands that fit, best first; Enter or a click
+// runs one. `recent`: ids run lately (first when nothing's typed yet). True while it's open.
+struct CommandSearch {
+    bool open = false;
+    char text[128] = {};
+    int at = 0;
+    bool focus = false;
+    void show() { open = true, focus = true, text[0] = 0, at = 0; }
+    // Draws it; the command to run (its index), or -1.
+    int draw(const std::vector<Command>& all, const std::vector<std::string>& recent);
+};
+
+// A pie menu: the choices round the mouse, picked by moving towards one and letting go of the
+// key (or clicking). Draws it; the index picked, -1 while choosing, -2 when let go on nothing.
+struct PieItem {
+    std::string name;
+    Icon icon = Icon::Select;
+    bool hasIcon = true;
+    bool on = false;
+};
+int pieMenu(const char* title, ImVec2 centre, const std::vector<PieItem>& items, bool released);
+
+} // namespace fry