From d819be1c8161741e1e736521d12c06749af87527 Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Mon, 18 Aug 2025 23:27:21 +0200
Subject: src: minor rearrangement:

* Move ui -> tui
* Add intermediate ui.h file for future implementation of different ui
  engines.
* Add include guards
* tui: use object oriented approach
---
 src/tui.c | 193 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 src/tui.c

(limited to 'src/tui.c')

diff --git a/src/tui.c b/src/tui.c
new file mode 100644
index 0000000..d4bc1aa
--- /dev/null
+++ b/src/tui.c
@@ -0,0 +1,193 @@
+/* parc
+ * Copyright (C) 2025 Ekaitz Zarraga <ekaitz@elenq.tech>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * XTERM escape sequence reference:
+ * https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+ * Good summary:
+ * https://en.wikipedia.org/wiki/ANSI_escape_code
+ *
+ * also:
+ *    man console_codes
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <string.h>
+#include "tui-internals.h"
+
+#define ESC '\x1b'
+
+const char CSI_LEAD[3] = { ESC, '[', '\0'};
+
+void
+tui_cursor_save (void)
+{
+  printf ("%ss", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+tui_cursor_restore (void)
+{
+  printf ("%su", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+tui_mouse_enable (void)
+{
+  printf ("%s?1000h", CSI_LEAD);
+  fflush (stdout);
+}
+void
+tui_mouse_disable (void)
+{
+  printf ("%s?1000l", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+tui_cursor_move (int x, int y)
+{
+  /*
+   * Also valid with CSI<L>;<C>f being <L> and <C> line number and column
+   * number respectively. In ttys, cursor starts at 1,1
+   */
+  printf ("%s%d;%dH", CSI_LEAD, y, x);
+  fflush (stdout);
+}
+
+void
+tui_cursor_show (void)
+{
+  printf ("%s?25h", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+tui_cursor_hide (void)
+{
+  printf ("%s?25l", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+tui_screen_erase (void)
+{
+  printf ("%s2J", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+tui_alternate_buffer_enable (void)
+{
+  printf ("%s?1049h", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+tui_alternate_buffer_disable (void)
+{
+  printf ("%s?1049l", CSI_LEAD);
+  fflush (stdout);
+}
+
+tui *
+tui_create (void)
+{
+  tui *ui = malloc (sizeof *ui);
+  /* Get interface configuration to reset it later */
+  tcgetattr (0, &ui->term_old_config);
+
+  /* Get interface configuration to edit */
+  tcgetattr (0, &ui->term_config);
+
+  /* Set the new configuration */
+  ui->term_config.c_lflag &= ~ (ECHO | ECHONL | ICANON | IEXTEN | ISIG);
+  ui->term_config.c_cc[VMIN]  = 1;   /* Wait until 1 character is in buffer */
+  ui->term_config.c_cc[VTIME] = 0;   /* Wait indefinitely */
+  /* TCSANOW makes the change occur immediately */
+  tcsetattr (0, TCSANOW, &ui->term_config);
+  tui_alternate_buffer_enable ();
+  tui_cursor_move (0, 0);
+  tui_mouse_enable ();
+  return ui;
+}
+
+void
+tui_destroy (tui *ui)
+{
+  /* Set old configuration again and exit. */
+  /* If it's not set back the normal configuration of the */
+  /* terminal will be broken later! */
+  tcsetattr (0, TCSANOW, &ui->term_old_config);
+  tui_alternate_buffer_disable ();
+  free (ui);
+}
+
+void
+tui_input_sequence_consume (void)
+{
+  int c, x, y;
+  c = getchar ();
+  if (ESC == c)
+    {
+      /* TODO: parse escape sequence */
+      c = getchar ();
+      if (c == '[')
+        {
+          c = getchar ();
+          switch (c)
+            {
+            case 'M':
+              /*https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Normal-tracking-mode*/
+              /* They add 32 to the coordinates */
+              c = getchar () - 32;
+              x = getchar () - 32;
+              y = getchar () - 32;
+              printf ("%d, %d, %d\n", c, x, y);
+              break;
+
+            case 'I':
+              /* Gained focus */
+              break;
+            case 'O':
+              /* Lost focus */
+              break;
+
+            default:
+              break;
+            }
+        }
+    }
+  else
+    ;
+    /* return key event */
+}
+
+void
+tui_loop (tui *ui)
+{
+  char input_buf [100];
+  memset (input_buf, 0, 100);
+  while (1)
+    {
+      tui_input_sequence_consume ();
+    }
+}
-- 
cgit v1.2.3