From c2336a8a22a5ddf26b33a53f914bf0d5397a6553 Mon Sep 17 00:00:00 2001
From: _ov4 <ov4@ov4.org>
Date: Tue, 22 Sep 2026 02:52:22 +0000
Subject: add cursor moving limit pos

---
 src/line/cursor.cc | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/line/cursor.cc

(limited to 'src/line/cursor.cc')

diff --git a/src/line/cursor.cc b/src/line/cursor.cc
new file mode 100644
index 0000000..ce01466
--- /dev/null
+++ b/src/line/cursor.cc
@@ -0,0 +1,93 @@
+#include "line/cursor.h"
+
+#include <print>
+#include <iostream>
+#include <string>
+#include <unistd.h>
+#include <cstdio>
+#include <cstdlib>
+#include <termios.h>
+
+using namespace std;
+
+namespace ov4
+{
+
+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;
+} 
+
+void print_override(const std::string &s)
+{
+    print("\r");
+    fflush(stdout);
+    print("{}", s);
+    fflush(stdout);
+    cursor_col = s.size()+1;
+    line_end_pos = cursor_col;
+}
+
+void move_cursor(char c)
+{
+    switch (c)
+    {
+        // case 'A':
+        //     print("\x1b[A");
+        //     fflush(stdout);
+        //     cursor_row--;
+        //     break;
+        // case 'B':
+        //     print("\x1b[B");
+        //     fflush(stdout);
+        //     cursor_row++;
+        //     break;
+        case 'C':
+            if (cursor_col < line_end_pos)
+            {
+                print("\x1b[C");
+                fflush(stdout);
+                cursor_col++;
+            }
+            break;
+        case 'D':
+            if (cursor_col > 1)
+            {
+                print("\x1b[D");
+                fflush(stdout);
+                cursor_col--;
+            }
+            break;
+        default:
+            return;
+    }
+}
+
+}
-- 
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