From c24320b65ab02061223a7460a01360bd997f9e18 Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Sun, 17 Aug 2025 00:13:56 +0200
Subject: ui: Start with some CSI commands (xterm compat)

---
 src/ui.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/ui.h | 20 ++++++++++++++++++
 2 files changed, 94 insertions(+)
 create mode 100644 src/ui.c
 create mode 100644 src/ui.h

(limited to 'src')

diff --git a/src/ui.c b/src/ui.c
new file mode 100644
index 0000000..e4fc35b
--- /dev/null
+++ b/src/ui.c
@@ -0,0 +1,74 @@
+/* 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
+ */
+
+#include <stdio.h>
+
+#define ESC '\x1b'
+
+const char CSI_LEAD[3] = { ESC, '[', '\0'};
+
+void
+ui_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
+ui_cursor_show (void)
+{
+  printf ("%s?25h", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+ui_cursor_hide (void)
+{
+  printf ("%s?25l", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+ui_screen_erase (void)
+{
+  printf ("%s2J", CSI_LEAD);
+  fflush (stdout);
+}
+
+
+void
+ui_alternate_buffer_enable (void)
+{
+  printf ("%s?1049h", CSI_LEAD);
+  fflush (stdout);
+}
+
+void
+ui_alternate_buffer_disable (void)
+{
+  printf ("%s?1049l", CSI_LEAD);
+  fflush (stdout);
+}
diff --git a/src/ui.h b/src/ui.h
new file mode 100644
index 0000000..3e2bd00
--- /dev/null
+++ b/src/ui.h
@@ -0,0 +1,20 @@
+/* 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/>.
+ */
+void ui_cursor_move (int x, int y);
+
+void ui_alternate_buffer_enable (void);
+void ui_alternate_buffer_disable (void);
-- 
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