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.c | 159 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 src/dged/keyboard.c

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

diff --git a/src/dged/keyboard.c b/src/dged/keyboard.c
new file mode 100644
index 0000000..4b142ee
--- /dev/null
+++ b/src/dged/keyboard.c
@@ -0,0 +1,159 @@
+#define _DEFAULT_SOURCE
+#include "keyboard.h"
+#include "reactor.h"
+#include "stdio.h"
+#include "utf8.h"
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+
+struct keyboard keyboard_create(struct reactor *reactor) {
+  struct termios term;
+  tcgetattr(0, &term);
+
+  // set input to non-blocking
+  term.c_cc[VMIN] = 0;
+  term.c_cc[VTIME] = 0;
+  tcsetattr(0, TCSADRAIN, &term);
+  return keyboard_create_fd(reactor, STDIN_FILENO);
+}
+
+struct keyboard keyboard_create_fd(struct reactor *reactor, int fd) {
+  return (struct keyboard){
+      .fd = fd,
+      .reactor_event_id = reactor_register_interest(reactor, fd, ReadInterest),
+  };
+}
+
+void parse_keys(uint8_t *bytes, uint32_t nbytes, struct key *out_keys,
+                uint32_t *out_nkeys) {
+  // TODO: can be optimized if "bytes" contains no special chars
+  uint32_t nkps = 0;
+  for (uint32_t bytei = 0; bytei < nbytes; ++bytei) {
+    uint8_t b = bytes[bytei];
+    bool has_more = bytei + 1 < nbytes;
+    uint8_t next = has_more ? bytes[bytei + 1] : 0;
+
+    struct key *kp = &out_keys[nkps];
+    if (b == 0x1b) { // meta
+      kp->start = bytei;
+      kp->mod = Meta;
+    } else if (has_more && isalnum(next) && kp->mod & Meta &&
+               (b == '[' ||
+                b == '0')) { // special char (function keys, pgdn, etc)
+      kp->mod = Spec;
+    } else if (b == 0x7f) { // ?
+      kp->mod |= Ctrl;
+      kp->key = '?';
+      kp->start = bytei;
+      kp->end = bytei + 1;
+      ++nkps;
+    } else if (iscntrl(b)) { // ctrl char
+      kp->mod |= Ctrl;
+      kp->key = b | 0x40;
+      kp->start = bytei;
+      kp->end = bytei + 1;
+      ++nkps;
+    } else {
+      if (kp->mod & Spec && b == '~') {
+        // skip tilde in special chars
+        kp->end = bytei + 1;
+        ++nkps;
+      } else if (kp->mod & Meta || kp->mod & Spec) {
+        kp->key = b;
+        kp->end = bytei + 1;
+
+        if (kp->mod & Meta || (kp->mod & Spec && next != '~')) {
+          ++nkps;
+        }
+      } else if (utf8_byte_is_unicode_continuation(b)) {
+        // do nothing for these
+      } else if (utf8_byte_is_unicode_start(b)) { // unicode char
+        kp->mod = None;
+        kp->key = 0;
+        kp->start = bytei;
+        kp->end = bytei + utf8_nbytes(bytes + bytei, nbytes - bytei, 1);
+        ++nkps;
+      } else { // normal ASCII char
+        kp->mod = None;
+        kp->key = b;
+        kp->start = bytei;
+        kp->end = bytei + 1;
+        ++nkps;
+      }
+    }
+  }
+
+  *out_nkeys = nkps;
+}
+
+struct keyboard_update keyboard_update(struct keyboard *kbd,
+                                       struct reactor *reactor,
+                                       void *(*frame_alloc)(size_t)) {
+
+  struct keyboard_update upd = (struct keyboard_update){
+      .keys = NULL,
+      .nkeys = 0,
+      .nbytes = 0,
+      .raw = NULL,
+  };
+
+  // check if there is anything to do
+  if (!reactor_poll_event(reactor, kbd->reactor_event_id)) {
+    return upd;
+  }
+
+  // read all input in chunks of `bufsize` bytes
+  const uint32_t bufsize = 128;
+  uint8_t *buf = malloc(bufsize), *writepos = buf;
+  int nbytes = 0, nread = 0;
+  while ((nread = read(kbd->fd, writepos, bufsize)) == bufsize) {
+    nbytes += bufsize;
+    buf = realloc(buf, nbytes + bufsize);
+    writepos = buf + nbytes;
+  }
+
+  nbytes += nread;
+
+  if (nbytes > 0) {
+    upd.nbytes = nbytes;
+    upd.raw = frame_alloc(nbytes);
+    memcpy(upd.raw, buf, nbytes);
+    upd.keys = frame_alloc(sizeof(struct key) * nbytes);
+    memset(upd.keys, 0, sizeof(struct key) * nbytes);
+
+    parse_keys(upd.raw, upd.nbytes, upd.keys, &upd.nkeys);
+  }
+
+  free(buf);
+  return upd;
+}
+
+bool key_equal_char(struct key *key, uint8_t mod, uint8_t c) {
+  return key->key == c && key->mod == mod;
+}
+
+bool key_equal(struct key *key1, struct key *key2) {
+  return key_equal_char(key1, key2->mod, key2->key);
+}
+
+uint32_t key_name(struct key *key, char *buf, size_t capacity) {
+  const char *mod = "";
+  switch (key->mod) {
+  case Ctrl:
+    mod = "c-";
+    break;
+  case Meta:
+    mod = "m-";
+    break;
+  case Spec:
+    mod = "special-";
+    break;
+  }
+
+  snprintf(buf, capacity, "%s%c", mod, tolower(key->key));
+}
-- 
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