Merge pull request #19584 from bfredl/terminal_c_BSL_c_O

implement <c-\><c-o> key for terminal mode

src/nvim/edit.c

@@ -1223,10 +1223,10 @@ bool edit(int cmdchar, bool startln, long count)
       // the value of `restart_edit` before `ex_normal` returns.
       restart_edit = 'i';
       force_restart_edit = true;
+      return false;
     } else {
-      terminal_enter();
+      return terminal_enter();
     }
-    return false;
   }
 
   // Don't allow inserting in the sandbox.

src/nvim/screen.c

@@ -6026,7 +6026,11 @@ int showmode(void)
           msg_puts_attr(_(" INSERT"), attr);
         } else if (restart_edit == 'I' || restart_edit == 'i'
                    || restart_edit == 'a' || restart_edit == 'A') {
-          msg_puts_attr(_(" (insert)"), attr);
+          if (curbuf->terminal) {
+            msg_puts_attr(_(" (terminal)"), attr);
+          } else {
+            msg_puts_attr(_(" (insert)"), attr);
+          }
         } else if (restart_edit == 'R') {
           msg_puts_attr(_(" (replace)"), attr);
         } else if (restart_edit == 'V') {

src/nvim/state.c

@@ -211,12 +211,15 @@ void get_mode(char *buf)
       buf[i++] = 'o';
       // to be able to detect force-linewise/blockwise/charwise operations
       buf[i++] = (char)motion_force;
+    } else if (curbuf->terminal) {
+      buf[i++] = 't';
+      if (restart_edit == 'I') {
+        buf[i++] = 'T';
+      }
     } else if (restart_edit == 'I' || restart_edit == 'R'
                || restart_edit == 'V') {
       buf[i++] = 'i';
       buf[i++] = (char)restart_edit;
-    } else if (curbuf->terminal) {
-      buf[i++] = 't';
     }
   }
 

src/nvim/terminal.c

@@ -82,6 +82,7 @@ typedef struct terminal_state {
   int save_rd;              // saved value of RedrawingDisabled
   bool close;
   bool got_bsl;             // if the last input was <C-\>
+  bool got_bsl_o;           // if left terminal mode with <c-\><c-o>
 } TerminalState;
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
@@ -388,12 +389,11 @@ void terminal_check_size(Terminal *term)
 }
 
 /// Implements MODE_TERMINAL state. :help Terminal-mode
-void terminal_enter(void)
+bool terminal_enter(void)
 {
   buf_T *buf = curbuf;
   assert(buf->terminal);  // Should only be called when curbuf has a terminal.
-  TerminalState state, *s = &state;
-  memset(s, 0, sizeof(TerminalState));
+  TerminalState s[1] = { 0 };
   s->term = buf->terminal;
   stop_insert_mode = false;
 
@@ -443,7 +443,9 @@ void terminal_enter(void)
   s->state.check = terminal_check;
   state_enter(&s->state);
 
-  restart_edit = 0;
+  if (!s->got_bsl_o) {
+    restart_edit = 0;
+  }
   State = save_state;
   RedrawingDisabled = s->save_rd;
   apply_autocmds(EVENT_TERMLEAVE, NULL, NULL, false, curbuf);
@@ -467,7 +469,11 @@ void terminal_enter(void)
   if (curbuf->terminal == s->term && !s->close) {
     terminal_check_cursor();
   }
-  unshowmode(true);
+  if (restart_edit) {
+    showmode();
+  } else {
+    unshowmode(true);
+  }
   ui_busy_stop();
   if (s->close) {
     bool wipe = s->term->buf_handle != 0;
@@ -477,6 +483,8 @@ void terminal_enter(void)
       do_cmdline_cmd("bwipeout!");
     }
   }
+
+  return s->got_bsl_o;
 }
 
 static void terminal_check_cursor(void)
@@ -564,6 +572,14 @@ static int terminal_execute(VimState *state, int key)
     }
     FALLTHROUGH;
 
+  case Ctrl_O:
+    if (s->got_bsl) {
+      s->got_bsl_o = true;
+      restart_edit = 'I';
+      return 0;
+    }
+    FALLTHROUGH;
+
   default:
     if (key == Ctrl_BSL && !s->got_bsl) {
       s->got_bsl = true;