Add soft word wrap for input area and improve navigation

tui/input.py

@@ -7,20 +7,65 @@ import os
 from .agent import submit, log
 
 
+def _build_visual(buffer, max_chars):
+    # Build list of (logical_line_idx, start_col) for each visual line.
+    visual = []
+    for i, line in enumerate(buffer):
+        if not line:
+            visual.append((i, 0))
+        else:
+            for start in range(0, max(len(line), 1), max_chars):
+                visual.append((i, start))
+    return visual
+
+
+def _find_visual(visual, logical_line, col):
+    # Find visual line index for given logical line and column.
+    best = 0
+    for idx, (li, start) in enumerate(visual):
+        if li == logical_line:
+            best = idx
+            if start <= col:
+                break
+    return best
+
+
 def handle_key(app, stdscr, key):
+    max_chars = app.w - 6  # usable width in input box
+    visual = _build_visual(app.input_buffer, max_chars)
+    cur_visual = _find_visual(visual, app.input_line, app.input_col)
+
+    processing = app.processing
+
+    # -- Always allowed (even during processing) --
+    if key == 3:                    # Ctrl+C → exit
+        app.running = False
+    elif key == curses.KEY_PPAGE:
+        app.scroll = max(0, app.scroll - (app.h - 10) // 2)
+    elif key == curses.KEY_NPAGE:
+        app.scroll += (app.h - 10) // 2
+    elif key == curses.KEY_RESIZE:
+        pass
+
+    # -- Blocked during processing --
+    elif processing:
+        pass  # ignore all other keys while processing
+
     # -- Ctrl shortcuts --
-    if key == 4:                      # Ctrl+D → submit query ke LLM
+    elif key == 4:                      # Ctrl+D → submit query ke LLM
         submit(app, stdscr)
     elif key == 23:                   # Ctrl+W → popup ganti workspace
         workspace_popup(app, stdscr)
-    elif key == 3:                    # Ctrl+C → exit
-        app.running = False
     elif key == 12:                   # Ctrl+L → clear chat log
         app.log.clear()
 
-    # -- Enter: buat baris baru di input buffer --
+    # -- Enter: split logical line at cursor position --
     elif key in (curses.KEY_ENTER, 10, 13):
-        app.input_buffer.insert(app.input_line + 1, "")
+        line = app.input_buffer[app.input_line]
+        left = line[:app.input_col]
+        right = line[app.input_col:]
+        app.input_buffer[app.input_line] = left
+        app.input_buffer.insert(app.input_line + 1, right)
         app.input_line += 1
         app.input_col = 0
 
@@ -40,17 +85,15 @@ def handle_key(app, stdscr, key):
 
     # -- Navigation arrows --
     elif key == curses.KEY_UP:
-        if app.input_line > 0:
+        if cur_visual > 0:
-            app.input_line -= 1
+            prev_li, prev_start = visual[cur_visual - 1]
-            app.input_col = min(
+            app.input_line = prev_li
-                app.input_col, len(app.input_buffer[app.input_line])
+            app.input_col = min(app.input_col, len(app.input_buffer[prev_li]))
-            )
     elif key == curses.KEY_DOWN:
-        if app.input_line < len(app.input_buffer) - 1:
+        if cur_visual < len(visual) - 1:
-            app.input_line += 1
+            next_li, next_start = visual[cur_visual + 1]
-            app.input_col = min(
+            app.input_line = next_li
-                app.input_col, len(app.input_buffer[app.input_line])
+            app.input_col = min(app.input_col, len(app.input_buffer[next_li]))
-            )
     elif key == curses.KEY_LEFT:
         if app.input_col > 0:
             app.input_col -= 1
@@ -68,16 +111,6 @@ def handle_key(app, stdscr, key):
     elif key == curses.KEY_END:
         app.input_col = len(app.input_buffer[app.input_line])
 
-    # -- Page Up / Down: scroll chat area --
-    elif key == curses.KEY_PPAGE:
-        app.scroll = max(0, app.scroll - (app.h - 10))
-    elif key == curses.KEY_NPAGE:
-        app.scroll += app.h - 10
-
-    # -- Resize terminal: tidak perlu action, next loop akan baca ukuran baru --
-    elif key == curses.KEY_RESIZE:
-        pass
-
     # -- Tab: insert 4 spasi --
     elif key == 9:
         line = app.input_buffer[app.input_line]