feat(prompt): multiline prompt input #33371

Problem:
Cannot enter multiline prompts in a buftype=prompt buffer.

Solution:
- Support shift+enter (`<s-enter>`) to start a new line in the prompt.
- Pasting multiline text via OS paste, clipboard, "xp, etc.
- A/I in editable region works as usual.
- i/a/A/I outside of editable region moves cursor to end of current
  prompt.
- Support undo/redo in prompt buffer.
- Support o/O in prompt buffer.
- Expose prompt location as `':` mark.

runtime/doc/channel.txt

@@ -183,22 +183,23 @@ If you want to type input for the job in a Vim window you have a few options:
 - Use a terminal window.  This works well if what you type goes directly to
   the job and the job output is directly displayed in the window.
   See |terminal|.
-- Use a window with a prompt buffer. This works well when entering a line for
+- Use a window with a prompt buffer. This works well when entering lines for
   the job in Vim while displaying (possibly filtered) output from the job.
 
 A prompt buffer is created by setting 'buftype' to "prompt". You would
 normally only do that in a newly created buffer.
 
-The user can edit and enter one line of text at the very last line of the
+The user can edit and enter text at the very last line of the buffer.  When
-buffer.  When pressing Enter in the prompt line the callback set with
+pressing Enter in the prompt line the callback set with |prompt_setcallback()|
-|prompt_setcallback()| is invoked.  It would normally send the line to a job.
+is invoked. To enter multiple lines user can use Shift+Enter that'd add a new
-Another callback would receive the output from the job and display it in the
+line. The final Enter submits the lines to  |prompt_setcallback()|. It would
-buffer, below the prompt (and above the next prompt).
+normally send the line to a job. Another callback would receive the output
+from the job and display it in the buffer, below the prompt (and above the
+next prompt).
 
-Only the text in the last line, after the prompt, is editable. The rest of the
+Only the text after the last prompt, is editable. The rest of the buffer is
-buffer is not modifiable with Normal mode commands.  It can be modified by
+not modifiable with Normal mode commands.  It can be modified by calling
-calling functions, such as |append()|.  Using other commands may mess up the
+functions, such as |append()|.  Using other commands may mess up the buffer.
-buffer.
 
 After setting 'buftype' to "prompt" Vim does not automatically start Insert
 mode, use `:startinsert` if you want to enter Insert mode, so that the user

runtime/doc/motion.txt

@@ -795,6 +795,14 @@ m<  or  m>		Set the |'<| or |'>| mark.  Useful to change what the
 			Note that the Visual mode cannot be set, only the
 			start and end position.
 
+						*m:*
+m:			Special mark for prompt buffers. It always shows the
+			line where current prompt starts. Text from this line
+			and below will be submitted when user submits.
+			Note: This mark is readonly. You can not modify it's
+			location. Also this mark is unique to prompt buffers as
+			a result not available in regular buffers.
+
 						*:ma* *:mark* *E191*
 :[range]ma[rk] {a-zA-Z'}
 			Set mark {a-zA-Z'} at last line number in [range],

runtime/doc/vim_diff.txt

@@ -472,6 +472,12 @@ Variables:
   instead of always being strings. |v:option_old| is now the old global value
   for all global-local options, instead of just string global-local options.
 
+Prompt-Buffer:
+- supports multiline inputs.
+- supports multiline paste.
+- supports undo/redo on current prompt.
+- supports normal o/O operations.
+
 Vimscript:
 - |:redir| nested in |execute()| works.
 

src/nvim/buffer.c

@@ -878,6 +878,7 @@ static void free_buffer(buf_T *buf)
   clear_fmark(&buf->b_last_cursor, 0);
   clear_fmark(&buf->b_last_insert, 0);
   clear_fmark(&buf->b_last_change, 0);
+  clear_fmark(&buf->b_prompt_start, 0);
   for (size_t i = 0; i < NMARKS; i++) {
     free_fmark(buf->b_namedm[i]);
   }
@@ -2024,6 +2025,7 @@ buf_T *buflist_new(char *ffname_arg, char *sfname_arg, linenr_T lnum, int flags)
   buf->b_prompt_callback.type = kCallbackNone;
   buf->b_prompt_interrupt.type = kCallbackNone;
   buf->b_prompt_text = NULL;
+  clear_fmark(&buf->b_prompt_start, 0);
 
   return buf;
 }

src/nvim/buffer_defs.h

@@ -699,6 +699,7 @@ struct file_buffer {
   Callback b_prompt_interrupt;  // set by prompt_setinterrupt()
   int b_prompt_insert;          // value for restart_edit when entering
                                 // a prompt buffer window.
+  fmark_T b_prompt_start;       // Start of the editable area of a prompt buffer.
 
   synblock_T b_s;               // Info related to syntax highlighting.  w_s
                                 // normally points to this, but some windows

src/nvim/change.c

@@ -1746,7 +1746,27 @@ bool open_line(int dir, int flags, int second_line_indent, bool *did_do_comment)
 
   curbuf_splice_pending++;
   old_cursor = curwin->w_cursor;
+  int old_cmod_flags = cmdmod.cmod_flags;
+  char *prompt_moved = NULL;
   if (dir == BACKWARD) {
+    // In case of prompt buffer, when we are applying 'normal O' operation on line of prompt,
+    // we can't add a new line before the prompt. In this case, we move the prompt text one
+    // line below and create a new prompt line as current line.
+    if (bt_prompt(curbuf) && curwin->w_cursor.lnum == curbuf->b_prompt_start.mark.lnum) {
+      char *prompt_line = ml_get(curwin->w_cursor.lnum);
+      char *prompt = prompt_text();
+      size_t prompt_len = strlen(prompt);
+
+      if (strncmp(prompt_line, prompt, prompt_len) == 0) {
+        STRMOVE(prompt_line, prompt_line + prompt_len);
+        // We are moving the lines but the b_prompt_start mark needs to stay in
+        // place so freezing marks before making the move.
+        cmdmod.cmod_flags = cmdmod.cmod_flags | CMOD_LOCKMARKS;
+        ml_replace(curwin->w_cursor.lnum, prompt_line, true);
+        prompt_moved = concat_str(prompt, p_extra);
+        p_extra = prompt_moved;
+      }
+    }
     curwin->w_cursor.lnum--;
   }
   if ((State & VREPLACE_FLAG) == 0 || old_cursor.lnum >= orig_line_count) {
@@ -1936,6 +1956,8 @@ theend:
   xfree(saved_line);
   xfree(next_line);
   xfree(allocated);
+  xfree(prompt_moved);
+  cmdmod.cmod_flags = old_cmod_flags;
   return retval;
 }
 

src/nvim/edit.c

@@ -1077,7 +1077,7 @@ check_pum:
       cmdwin_result = CAR;
       return 0;
     }
-    if (bt_prompt(curbuf)) {
+    if ((mod_mask & MOD_MASK_SHIFT) == 0 && bt_prompt(curbuf)) {
       invoke_prompt_callback();
       if (!bt_prompt(curbuf)) {
         // buffer changed to a non-prompt buffer, get out of
@@ -1532,9 +1532,14 @@ static void init_prompt(int cmdchar_todo)
 {
   char *prompt = prompt_text();
 
+  if (curwin->w_cursor.lnum < curbuf->b_prompt_start.mark.lnum) {
     curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count;
+    coladvance(curwin, MAXCOL);
+  }
   char *text = get_cursor_line_ptr();
-  if (strncmp(text, prompt, strlen(prompt)) != 0) {
+  if ((curbuf->b_prompt_start.mark.lnum == curwin->w_cursor.lnum
+       && strncmp(text, prompt, strlen(prompt)) != 0)
+      || curbuf->b_prompt_start.mark.lnum > curwin->w_cursor.lnum) {
     // prompt is missing, insert it or append a line with it
     if (*text == NUL) {
       ml_replace(curbuf->b_ml.ml_line_count, prompt, true);
@@ -1547,8 +1552,9 @@ static void init_prompt(int cmdchar_todo)
   }
 
   // Insert always starts after the prompt, allow editing text after it.
-  if (Insstart_orig.lnum != curwin->w_cursor.lnum || Insstart_orig.col != (colnr_T)strlen(prompt)) {
+  if (Insstart_orig.lnum != curbuf->b_prompt_start.mark.lnum
-    Insstart.lnum = curwin->w_cursor.lnum;
+      || Insstart_orig.col != (colnr_T)strlen(prompt)) {
+    Insstart.lnum = curbuf->b_prompt_start.mark.lnum;
     Insstart.col = (colnr_T)strlen(prompt);
     Insstart_orig = Insstart;
     Insstart_textlen = Insstart.col;
@@ -1559,7 +1565,9 @@ static void init_prompt(int cmdchar_todo)
   if (cmdchar_todo == 'A') {
     coladvance(curwin, MAXCOL);
   }
+  if (curbuf->b_prompt_start.mark.lnum == curwin->w_cursor.lnum) {
     curwin->w_cursor.col = MAX(curwin->w_cursor.col, (colnr_T)strlen(prompt));
+  }
   // Make sure the cursor is in a valid position.
   check_cursor(curwin);
 }
@@ -1568,8 +1576,9 @@ static void init_prompt(int cmdchar_todo)
 bool prompt_curpos_editable(void)
   FUNC_ATTR_PURE
 {
-  return curwin->w_cursor.lnum == curbuf->b_ml.ml_line_count
+  return curwin->w_cursor.lnum > curbuf->b_prompt_start.mark.lnum
-         && curwin->w_cursor.col >= (int)strlen(prompt_text());
+         || (curwin->w_cursor.lnum == curbuf->b_prompt_start.mark.lnum
+             && curwin->w_cursor.col >= (int)strlen(prompt_text()));
 }
 
 // Undo the previous edit_putchar().

src/nvim/eval.c

@@ -78,6 +78,7 @@
 #include "nvim/strings.h"
 #include "nvim/tag.h"
 #include "nvim/types_defs.h"
+#include "nvim/undo.h"
 #include "nvim/version.h"
 #include "nvim/vim_defs.h"
 #include "nvim/window.h"
@@ -8663,30 +8664,46 @@ void invoke_prompt_callback(void)
 {
   typval_T rettv;
   typval_T argv[2];
-  linenr_T lnum = curbuf->b_ml.ml_line_count;
+  linenr_T lnum_start = curbuf->b_prompt_start.mark.lnum;
+  linenr_T lnum_last = curbuf->b_ml.ml_line_count;
 
   // Add a new line for the prompt before invoking the callback, so that
   // text can always be inserted above the last line.
-  ml_append(lnum, "", 0, false);
+  ml_append(lnum_last, "", 0, false);
-  appended_lines_mark(lnum, 1);
+  appended_lines_mark(lnum_last, 1);
-  curwin->w_cursor.lnum = lnum + 1;
+  curwin->w_cursor.lnum = lnum_last + 1;
   curwin->w_cursor.col = 0;
 
   if (curbuf->b_prompt_callback.type == kCallbackNone) {
-    return;
+    goto theend;
   }
-  char *text = ml_get(lnum);
+  char *text = ml_get(lnum_start);
   char *prompt = prompt_text();
   if (strlen(text) >= strlen(prompt)) {
     text += strlen(prompt);
   }
+
+  char *full_text = xstrdup(text);
+  for (linenr_T i = lnum_start + 1; i <= lnum_last; i++) {
+    char *half_text = concat_str(full_text, "\n");
+    xfree(full_text);
+    full_text = concat_str(half_text, ml_get(i));
+    xfree(half_text);
+  }
   argv[0].v_type = VAR_STRING;
-  argv[0].vval.v_string = xstrdup(text);
+  argv[0].vval.v_string = full_text;
   argv[1].v_type = VAR_UNKNOWN;
 
   callback_call(&curbuf->b_prompt_callback, 1, argv, &rettv);
   tv_clear(&argv[0]);
   tv_clear(&rettv);
+
+theend:
+  // clear undo history on submit
+  u_clearallandblockfree(curbuf);
+
+  pos_T next_prompt = { .lnum = curbuf->b_ml.ml_line_count, .col = 1, .coladd = 0 };
+  RESET_FMARK(&curbuf->b_prompt_start, next_prompt, 0, ((fmarkv_T)INIT_FMARKV));
 }
 
 /// @return  true when the interrupt callback was invoked.

src/nvim/mark.c

@@ -469,6 +469,9 @@ fmark_T *mark_get_local(buf_T *buf, win_T *win, int name)
     // to where last change was made
   } else if (name == '.') {
     mark = &buf->b_last_change;
+    // prompt start location
+  } else if (name == ':' && bt_prompt(buf)) {
+    mark = &(buf->b_prompt_start);
     // Mark that are actually not marks but motions, e.g {, }, (, ), ...
   } else {
     mark = mark_get_motion(buf, win, name);
@@ -908,6 +911,9 @@ void ex_marks(exarg_T *eap)
   show_one_mark(']', arg, &curbuf->b_op_end, NULL, true);
   show_one_mark('^', arg, &curbuf->b_last_insert.mark, NULL, true);
   show_one_mark('.', arg, &curbuf->b_last_change.mark, NULL, true);
+  if (bt_prompt(curbuf)) {
+    show_one_mark(':', arg, &curbuf->b_prompt_start.mark, NULL, true);
+  }
 
   // Show the marks as where they will jump to.
   pos_T *startp = &curbuf->b_visual.vi_start;
@@ -1030,6 +1036,9 @@ void ex_delmarks(exarg_T *eap)
         case '^':
           clear_fmark(&curbuf->b_last_insert, timestamp);
           break;
+        case ':':
+          // Readonly mark. No deletion allowed.
+          break;
         case '.':
           clear_fmark(&curbuf->b_last_change, timestamp);
           break;
@@ -1223,6 +1232,11 @@ void mark_adjust_buf(buf_T *buf, linenr_T line1, linenr_T line2, linenr_T amount
       ONE_ADJUST(&(buf->b_last_cursor.mark.lnum));
     }
 
+    // on prompt buffer adjust the last prompt start location mark
+    if (bt_prompt(curbuf)) {
+      ONE_ADJUST_NODEL(&(buf->b_prompt_start.mark.lnum));
+    }
+
     // list of change positions
     for (int i = 0; i < buf->b_changelistlen; i++) {
       ONE_ADJUST_NODEL(&(buf->b_changelist[i].mark.lnum));
@@ -1712,6 +1726,9 @@ bool mark_set_local(const char name, buf_T *const buf, const fmark_T fm, const b
     fm_tgt = &(buf->b_last_cursor);
   } else if (name == '^') {
     fm_tgt = &(buf->b_last_insert);
+  } else if (name == ':') {
+    // Readonly mark for prompt buffer. Can't be edited on user side.
+    return false;
   } else if (name == '.') {
     fm_tgt = &(buf->b_last_change);
   } else {

src/nvim/normal.c

@@ -4458,10 +4458,6 @@ static void nv_kundo(cmdarg_T *cap)
     return;
   }
 
-  if (bt_prompt(curbuf)) {
-    clearopbeep(cap->oap);
-    return;
-  }
   u_undo(cap->count1);
   curwin->w_set_curswant = true;
 }
@@ -6481,9 +6477,16 @@ static void nv_put_opt(cmdarg_T *cap, bool fix_indent)
   }
 
   if (bt_prompt(curbuf) && !prompt_curpos_editable()) {
+    if (curwin->w_cursor.lnum == curbuf->b_prompt_start.mark.lnum) {
+      curwin->w_cursor.col = (int)strlen(prompt_text());
+      // Since we've shifted the cursor to the first editable char. We want to
+      // paste before that.
+      cap->cmdchar = 'P';
+    } else {
       clearopbeep(cap->oap);
       return;
     }
+  }
 
   if (fix_indent) {
     dir = (cap->cmdchar == ']' && cap->nchar == 'p')
@@ -6613,7 +6616,7 @@ static void nv_open(cmdarg_T *cap)
   } else if (VIsual_active) {
     // switch start and end of visual/
     v_swap_corners(cap->cmdchar);
-  } else if (bt_prompt(curbuf)) {
+  } else if (bt_prompt(curbuf) && curwin->w_cursor.lnum < curbuf->b_prompt_start.mark.lnum) {
     clearopbeep(cap->oap);
   } else {
     n_opencmd(cap);

src/nvim/optionstr.c

@@ -28,6 +28,7 @@
 #include "nvim/indent_c.h"
 #include "nvim/insexpand.h"
 #include "nvim/macros_defs.h"
+#include "nvim/mark.h"
 #include "nvim/mbyte.h"
 #include "nvim/memline.h"
 #include "nvim/memory.h"
@@ -695,6 +696,11 @@ const char *did_set_buftype(optset_T *args)
       || opt_strings_flags(buf->b_p_bt, opt_bt_values, NULL, false) != OK) {
     return e_invarg;
   }
+  // buftype=prompt: set the prompt start position to lastline.
+  if (buf->b_p_bt[0] == 'p') {
+    pos_T next_prompt = { .lnum = buf->b_ml.ml_line_count, .col = 1, .coladd = 0 };
+    RESET_FMARK(&buf->b_prompt_start, next_prompt, 0, ((fmarkv_T)INIT_FMARKV));
+  }
   if (win->w_status_height || global_stl_height()) {
     win->w_redr_status = true;
     redraw_later(win, UPD_VALID);

test/functional/legacy/prompt_buffer_spec.lua

@@ -3,6 +3,7 @@ local n = require('test.functional.testnvim')()
 local Screen = require('test.functional.ui.screen')
 
 local feed = n.feed
+local fn = n.call
 local source = n.source
 local clear = n.clear
 local command = n.command
@@ -31,7 +32,7 @@ describe('prompt buffer', function()
           close
         else
           " Add the output above the current prompt.
-          call append(line("$") - 1, 'Command: "' . a:text . '"')
+          call append(line("$") - 1, split('Command: "' . a:text . '"', '\n'))
           " Reset &modified to allow the buffer to be closed.
           set nomodified
           call timer_start(20, {id -> TimerFunc(a:text)})
@@ -40,7 +41,7 @@ describe('prompt buffer', function()
 
       func TimerFunc(text)
         " Add the output above the current prompt.
-        call append(line("$") - 1, 'Result: "' . a:text .'"')
+        call append(line("$") - 1, split('Result: "' . a:text .'"', '\n'))
         " Reset &modified to allow the buffer to be closed.
         set nomodified
       endfunc
@@ -245,4 +246,280 @@ describe('prompt buffer', function()
       Leave
       Close]])
   end)
+
+  it('can insert mutli line text', function()
+    source_script()
+    feed('line 1<s-cr>line 2<s-cr>line 3')
+    screen:expect([[
+      cmd: line 1              |
+      line 2                   |
+      line 3^                   |
+      {1:~                        }|
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('<cr>')
+    -- submiting multiline text works
+    screen:expect([[
+      Result: "line 1          |
+      line 2                   |
+      line 3"                  |
+      cmd: ^                    |
+      {3:[Prompt]                 }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+  end)
+
+  it('can paste multiline text', function()
+    source_script()
+    fn('setreg', 'a', 'line 1\nline 2\nline 3')
+    feed('<esc>"ap')
+    screen:expect([[
+      cmd: ^line 1              |
+      line 2                   |
+      line 3                   |
+      {1:~                        }|
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+                               |
+    ]])
+    feed('i<cr>')
+    screen:expect([[
+      Result: "line 1          |
+      line 2                   |
+      line 3"                  |
+      cmd: ^                    |
+      {3:[Prompt]                 }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+  end)
+
+  it('undo works for current prompt', function()
+    source_script()
+    -- text editiing alowed in current prompt
+    feed('tests-initial<esc>')
+    feed('bimiddle-<esc>')
+    screen:expect([[
+      cmd: tests-middle^-initial|
+      {1:~                        }|*3
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+                               |
+    ]])
+
+    feed('Fdx')
+    screen:expect([[
+      cmd: tests-mid^le-initial |
+      {1:~                        }|*3
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+                               |
+    ]])
+
+    -- can undo edits until prompt has been submitted
+    feed('u')
+    screen:expect([[
+      cmd: tests-mid^dle-initial|
+      {1:~                        }|*3
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      1 change; {MATCH:.*} |
+    ]])
+
+    feed('u')
+    screen:expect([[
+      cmd: tests-^initial       |
+      {1:~                        }|*3
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      1 change; {MATCH:.*} |
+    ]])
+
+    feed('i<cr><esc>')
+    screen:expect([[
+      cmd: tests-initial       |
+      Command: "tests-initial" |
+      Result: "tests-initial"  |
+      cmd:^                     |
+      {3:[Prompt]                 }|
+      other buffer             |
+      {1:~                        }|*3
+                               |
+    ]])
+
+    -- after submit undo does nothing
+    feed('u')
+    screen:expect([[
+      cmd: tests-initial       |
+      Command: "tests-initial" |
+      cmd:^                     |
+      {1:~                        }|
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      1 line {MATCH:.*} |
+    ]])
+  end)
+
+  it('o/O can create new lines', function()
+    source_script()
+    feed('line 1<s-cr>line 2<s-cr>line 3')
+    screen:expect([[
+      cmd: line 1              |
+      line 2                   |
+      line 3^                   |
+      {1:~                        }|
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('<esc>koafter')
+
+    screen:expect([[
+      cmd: line 1              |
+      line 2                   |
+      after^                    |
+      line 3                   |
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('<esc>kObefore')
+
+    screen:expect([[
+      cmd: line 1              |
+      before^                   |
+      line 2                   |
+      after                    |
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('<cr>')
+    screen:expect([[
+      line 2                   |
+      after                    |
+      line 3"                  |
+      cmd: ^                    |
+      {3:[Prompt]                 }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('line 4<s-cr>line 5')
+
+    feed('<esc>k0oafter prompt')
+    screen:expect([[
+      after                    |
+      line 3"                  |
+      cmd: line 4              |
+      after prompt^             |
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('<esc>k0Oat prompt')
+    screen:expect([[
+      after                    |
+      line 3"                  |
+      cmd: at prompt^           |
+      line 4                   |
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('<cr>')
+    screen:expect([[
+      line 4                   |
+      after prompt             |
+      line 5"                  |
+      cmd: ^                    |
+      {3:[Prompt]                 }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+  end)
+
+  it('deleting prompt adds it back on insert', function()
+    source_script()
+    feed('asdf')
+    screen:expect([[
+      cmd: asdf^                |
+      {1:~                        }|*3
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('<esc>ddi')
+    screen:expect([[
+      cmd: ^                    |
+      {1:~                        }|*3
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('asdf')
+    screen:expect([[
+      cmd: asdf^                |
+      {1:~                        }|*3
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+
+    feed('<esc>cc')
+    screen:expect([[
+      cmd: ^                    |
+      {1:~                        }|*3
+      {3:[Prompt] [+]             }|
+      other buffer             |
+      {1:~                        }|*3
+      {5:-- INSERT --}             |
+    ]])
+  end)
+
+  it(': mark follows current prompt', function()
+    source_script()
+    feed('asdf')
+    eq({ 1, 1 }, api.nvim_buf_get_mark(0, ':'))
+    feed('<cr>')
+    eq({ 3, 1 }, api.nvim_buf_get_mark(0, ':'))
+  end)
+
+  it(': mark only available in prompt buffer', function()
+    source_script()
+    feed('asdf')
+    eq({ 1, 1 }, api.nvim_buf_get_mark(0, ':'))
+    source('set buftype=')
+    eq(false, pcall(api.nvim_buf_get_mark, 0, ':'))
+  end)
 end)

test/old/testdir/test_prompt_buffer.vim

@@ -166,11 +166,12 @@ func Test_prompt_buffer_edit()
   normal! i
   call assert_beeps('normal! dd')
   call assert_beeps('normal! ~')
-  call assert_beeps('normal! o')
+  " Nvim: these operations are supported
-  call assert_beeps('normal! O')
+  " call assert_beeps('normal! o')
-  call assert_beeps('normal! p')
+  " call assert_beeps('normal! O')
-  call assert_beeps('normal! P')
+  " call assert_beeps('normal! p')
-  call assert_beeps('normal! u')
+  " call assert_beeps('normal! P')
+  " call assert_beeps('normal! u')
   call assert_beeps('normal! ra')
   call assert_beeps('normal! s')
   call assert_beeps('normal! S')