tabs and tab overview

composed.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <stdint.h>
+#include <uchar.h>
+
+struct composed {
+    char32_t *chars;
+    struct composed *left;
+    struct composed *right;
+    uint32_t key;
+    uint8_t count;
+    uint8_t width;
+    uint8_t forced_width;
+};
+
+uint32_t composed_key_from_chars(const uint32_t chars[], size_t count);
+uint32_t composed_key_from_key(uint32_t prev_key, uint32_t next_char);
+
+const struct composed *composed_lookup(struct composed *root, uint32_t key);
+const struct composed *composed_lookup_without_collision(
+    struct composed *root, uint32_t *key,
+    const char32_t *prefix, size_t prefix_len, char32_t wc, int forced_width);
+void composed_insert(struct composed **root, struct composed *node);
+
+void composed_free(struct composed *root);