From a123725a12e948d78badb2cb686d38548f1c633b Mon Sep 17 00:00:00 2001
From: Albert Cervin <albert@acervin.com>
Date: Thu, 6 Apr 2023 23:23:46 +0200
Subject: Implement window handling

Also implement searching.

fix undo boundaries

when it checked for other save point, it used && instead of == which
caused it to overwrite other types.

Fix bytes vs chars bug in text_get_region
---
 src/dged/keyboard.h | 145 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 src/dged/keyboard.h

(limited to 'src/dged/keyboard.h')

diff --git a/src/dged/keyboard.h b/src/dged/keyboard.h
new file mode 100644
index 0000000..e602b69
--- /dev/null
+++ b/src/dged/keyboard.h
@@ -0,0 +1,145 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * Key press modifiers
+ *
+ * Modifiers a key press can have.
+ */
+enum modifiers {
+  /** No modifier, bare key press */
+  None = 0,
+
+  /** Ctrl key */
+  Ctrl = 1 << 0,
+
+  /** Meta (Alt) key */
+  Meta = 1 << 1,
+
+  /** Special key (F keys, arrow keys, etc) */
+  Spec = 1 << 2,
+};
+
+/** Backspace key */
+#define BACKSPACE Ctrl, '?'
+/** Tab key */
+#define TAB Ctrl, 'I'
+/** Enter key */
+#define ENTER Ctrl, 'M'
+/** Delete key */
+#define DELETE Spec, '3'
+
+/** Up arrow key */
+#define UP Spec, 'A'
+/** Down arrow key */
+#define DOWN Spec, 'B'
+/** Right arrow key */
+#define RIGHT Spec, 'C'
+/** Left arrow key */
+#define LEFT Spec, 'D'
+
+/**
+ * A key press
+ */
+struct key {
+  /** The key pressed, will be 0 for a unicode char */
+  uint8_t key;
+  /** Modifier keys pressed (or-ed together) */
+  uint8_t mod;
+  /** Index where this key press starts in the raw input buffer */
+  uint8_t start;
+  /** Index where this key press ends in the raw input buffer */
+  uint8_t end;
+};
+
+/**
+ * The keyboard used to input characters.
+ */
+struct keyboard {
+  uint32_t reactor_event_id;
+  int fd;
+};
+
+/**
+ * The result of updating the keyboard
+ */
+struct keyboard_update {
+  /** The key presses */
+  struct key *keys;
+  /** Number of key presses in @ref keys */
+  uint32_t nkeys;
+
+  /** The raw input */
+  uint8_t *raw;
+  /** The number of bytes in the raw input */
+  uint32_t nbytes;
+};
+
+struct reactor;
+
+/**
+ * Create a new keyboard
+ *
+ * @param reactor @ref reactor "Reactor" to use for polling keyboard for
+ * readiness.
+ * @returns The created keyboard.
+ */
+struct keyboard keyboard_create(struct reactor *reactor);
+
+/**
+ * Create a new keyboard, reading input from fd
+ *
+ * @param reactor @ref reactor "Reactor" to use for polling keyboard for
+ * readiness.
+ * @param fd The file descriptor to get input from
+ * @returns The created keyboard.
+ */
+struct keyboard keyboard_create_fd(struct reactor *reactor, int fd);
+
+/**
+ * Update the keyboard.
+ *
+ * This will check the reactor for readiness to avoid blocking. If there is
+ * data, it will be read and converted to key presses.
+ *
+ * @param kbd The @ref keyboard to update.
+ * @param reactor The @ref reactor used when creating the @ref keyboard.
+ * @returns An instance of @ref keyboard_update representing the result of the
+ * update operation.
+ */
+struct keyboard_update keyboard_update(struct keyboard *kbd,
+                                       struct reactor *reactor,
+                                       void *(*frame_alloc)(size_t));
+
+/**
+ * Does key represent the same key press as mod and c.
+ *
+ * @param key The key to check.
+ * @param mod Modifier of a key to compare against.
+ * @param c Char of a key to compare against.
+ * @returns true if key represents the same key press as mod together with c,
+ * false otherwise
+ */
+bool key_equal_char(struct key *key, uint8_t mod, uint8_t c);
+
+/**
+ * Does key1 represent the same key press as key2?
+ *
+ * @param key1 First key to compare.
+ * @param key2 Second key to compare.
+ * @returns true if key1 and key2 represents the same key press, false
+ * otherwise.
+ */
+bool key_equal(struct key *key1, struct key *key2);
+
+/**
+ * Get a text representation of a key
+ *
+ * @param key @ref key "Key" to get text representation for.
+ * @param buf character buffer for holding the result.
+ * @param capacity The capacity of buf.
+ *
+ * @returns The number of characters written to buf.
+ */
+uint32_t key_name(struct key *key, char *buf, size_t capacity);
-- 
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