From 6d7ff828389456a1e73b313afe2b732eb50a207c Mon Sep 17 00:00:00 2001
From: _ov4 <ov4@ov4.org>
Date: Tue, 22 Sep 2026 03:22:34 +0000
Subject: add cursor insert

---
 include/line/cursor.h    |  2 ++
 module-test/line_test.cc |  1 +
 src/line/cursor.cc       | 23 +++++++++++++++++++++--
 src/line/mode.cc         |  2 +-
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/include/line/cursor.h b/include/line/cursor.h
index 7417201..39160dc 100644
--- a/include/line/cursor.h
+++ b/include/line/cursor.h
@@ -24,5 +24,7 @@ void print_override(const std::string &s);
 
 void move_cursor(char c);
 
+void cursor_input(char c, std::string &buffer);
+
 }
 
diff --git a/module-test/line_test.cc b/module-test/line_test.cc
index a608a16..e2784d9 100644
--- a/module-test/line_test.cc
+++ b/module-test/line_test.cc
@@ -29,6 +29,7 @@ int main()
     cursor_col = pos.col;
     string s = readline();
     disable_raw();
+    cout << "\n\n\n\n" << endl;
     cout << s << endl;
     return 0;
 }
diff --git a/src/line/cursor.cc b/src/line/cursor.cc
index ce01466..9ff8bbc 100644
--- a/src/line/cursor.cc
+++ b/src/line/cursor.cc
@@ -47,12 +47,13 @@ T_position get_cursor_position()
 
 void print_override(const std::string &s)
 {
+    print("\x1b[s"); fflush(stdout);
     print("\r");
     fflush(stdout);
     print("{}", s);
     fflush(stdout);
-    cursor_col = s.size()+1;
-    line_end_pos = cursor_col;
+    //line_end_pos = s.size()+1;
+    print("\x1b[u"); fflush(stdout);
 }
 
 void move_cursor(char c)
@@ -90,4 +91,22 @@ void move_cursor(char c)
     }
 }
 
+void cursor_input(char c, std::string &buffer)
+{
+    if (c != '\b')
+    {
+        buffer.insert(cursor_col-1, 1, c);
+        print("\x1b[C"); fflush(stdout);
+        cursor_col++;
+        line_end_pos = buffer.size()+1;
+        return;
+    }
+
+    // BACKSPACE
+    buffer.erase(cursor_col-1, 1);
+    print("\x1b[D"); fflush(stdout);
+    cursor_col--;
+    line_end_pos = buffer.size()+1;
+}
+
 }
diff --git a/src/line/mode.cc b/src/line/mode.cc
index a2236e2..18c7347 100644
--- a/src/line/mode.cc
+++ b/src/line/mode.cc
@@ -105,7 +105,7 @@ string readline()
         // normal char
         else
         {
-            buffer += c;
+            cursor_input(c, buffer);
             print_override(buffer);
         }
     }
-- 
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