From a025219a21254c8970e19a90bf31148d351f6579 Mon Sep 17 00:00:00 2001
From: _ov4 <ov4@ov4.org>
Date: Mon, 21 Sep 2026 11:55:10 +0000
Subject: add raw input echo

---
 src/line/mode.cc | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 src/line/mode.cc

(limited to 'src/line')

diff --git a/src/line/mode.cc b/src/line/mode.cc
new file mode 100644
index 0000000..83eda67
--- /dev/null
+++ b/src/line/mode.cc
@@ -0,0 +1,130 @@
+#include "line/mode.h"
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <iostream>
+#include <print>
+
+using namespace std;
+
+namespace ov4
+{
+
+void disable_raw()
+{
+    tcsetattr(STDIN_FILENO, TCSAFLUSH, &attr);
+}
+
+void enable_raw()
+{
+    termios attr_raw;
+    tcgetattr(STDIN_FILENO, &attr);
+    tcgetattr(STDIN_FILENO, &attr_raw);
+
+    // LOCAL
+
+    // disable
+    // echo
+    // canonical
+    // signal
+    // disable post-input processing, aka control-V
+    attr_raw.c_lflag &= ~(ECHO | ICANON | ISIG | IEXTEN);
+
+    // INPUT
+
+    // disable 
+    // software flow control, aka control-S/Q
+    // \n and \r conversion
+    attr_raw.c_iflag &= ~(IXON | ICRNL);
+
+    // OUTPUT
+
+    // disable
+    // post-output processing
+    attr_raw.c_oflag &= ~(OPOST);
+
+    // misc
+    attr_raw.c_iflag &= ~(BRKINT | INPCK | ISTRIP);
+    attr_raw.c_cflag |= ~(CS8);
+
+    atexit(disable_raw);
+
+    // TCSAFLUSH
+    // the change shall occur after all output written to fildes is transmitted
+    // and all input so far received but not read shall be discarded before the change is made
+    tcsetattr(STDIN_FILENO, TCSAFLUSH, &attr_raw);
+}
+
+void clear_below()
+{
+    print("\x1b[0J");
+}
+
+string readline()
+{
+    string buffer;
+    char c;
+    while (read(STDIN_FILENO, &c, 1) == 1)
+    {
+        if (c == 'Q') break;
+        else if (c == 'C') 
+        {
+            clear_below();
+        }
+        else if (c == 'R')
+        {
+            get_cursor_position();
+        }
+        else if (iscntrl(c))
+        {
+            print("control: {}\r\n", static_cast<unsigned char>(c));
+            fflush(stdout);
+            if (c == 13) // \n
+            {
+                //print("line: {}\r\n", buffer);
+                return buffer;
+            }
+        }
+        else
+        {
+            print("{}", c);
+            buffer += c;
+            fflush(stdout);
+        }
+    }
+    return buffer;
+}
+
+T_position get_cursor_position()
+{
+    char c;
+    string buffer;
+    T_position pos;
+    int row, col;
+    tcflush(STDIN_FILENO, TCIFLUSH);
+    cout << "\x1b[6n" << flush;
+    while (read(STDIN_FILENO, &c, 1) == 1)
+    {
+        if (c == 'R') break;
+        buffer += c;
+    }
+    if (buffer.size() <= 2 || buffer[0] != '\x1b' || buffer[1] != '[')
+    {
+        pos.row = -1;
+        pos.col = -1;
+        return pos;
+    }
+    if ((sscanf(buffer.c_str(), "\x1b[%d;%d", &row, &col)) != 2)
+    {
+        pos.row = -1;
+        pos.col = -1;
+        return pos;
+    }
+    pos.row = row;
+    pos.col = col;
+    print("row {}, col {}\r\n", row, col);
+    fflush(stdout);
+    return pos;
+} 
+
+}
-- 
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