Add hotkey binding for toggling the cursor mode

docs/source/hotkeys.rst

@@ -246,6 +246,9 @@ Display
    * - :kbd:`x`
      - Toggle the hiding of log message fields. The hidden fields will be
        replaced with three bullets and highlighted in yellow.
+   * - :kbd:`Ctrl` + :kbd:`x`
+     - Toggle the cursor mode. Allows moving the selected line instead of
+       keeping it fixed at the top of the current screen.
    * - :kbd:`=`
      - Pause/unpause loading of new file data.
 

src/help.md

@@ -266,6 +266,7 @@ that you can always use `q` to pop the top view off of the stack.
 | CTRL-P        | Show/hide the data preview panel that may be opened when entering commands or SQL queries.                                                                                                                                                                                                                                                                                                                                                                                                                                   |
 | CTRL-F        | Toggle the enabled/disabled state of all filters in the current view.                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
 | x             | Toggle the hiding of log message fields. The hidden fields will be replaced with three bullets and highlighted in yellow.                                                                                                                                                                                                                                                                                                                                                                                                    |
+| CTRL-X        | Toggle the cursor mode. Allows moving the selected line instead of keeping it fixed at the top of the current screen.                                                                                                                                                                                                                                                                                                                                                                                                        |
 | F2            | Toggle mouse support.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
 
 ### Query

src/help.txt

@@ -383,6 +383,10 @@ Display options
                     will be replaced with three bullets and highlighted in
                     yellow.
 
+  CTRL-X            Toggle the cursor mode. Allows moving the selected line
+                    instead of keeping it fixed at the top of the current
+                    screen.
+
   F2                Toggle mouse support.
 
 Query

src/hotkeys.cc

@@ -963,7 +963,15 @@ handle_paging_key(int ch)
             lnav_data.ld_preview_hidden = !lnav_data.ld_preview_hidden;
             break;
 
+        case KEY_CTRL_X:
+            for (int i = 0; i < LNV__MAX; ++i) {
+                lnav_data.ld_views[i].set_selectable(!lnav_data.ld_views[i].is_selectable());
+            }
+            tc->reload_data();
+            break;
+
         default:
+            log_debug("key sequence %x", ch);
             return false;
     }
     return true;

src/view_curses.hh

@@ -76,6 +76,7 @@
 #define KEY_CTRL_P 16
 #define KEY_CTRL_R 18
 #define KEY_CTRL_W 23
+#define KEY_CTRL_X 24
 
 class view_curses;
 

test/expected_help.txt

@@ -349,6 +349,9 @@ Display options
  x              Toggle the hiding of log message fields. The 
                 hidden fields will be replaced with three bullets 
                 and highlighted in yellow.
+ CTRL-X         Toggle the cursor mode. Allows moving the selected 
+                line instead of keeping it fixed at the top of the 
+                current screen.
  F2             Toggle mouse support.
 
 Query