paste: edge-case: handle EOL at end-of-buffer

This is "readfile()-style", see also ":help channel-lines".

runtime/doc/eval.txt

@@ -4214,17 +4214,6 @@ getchar([expr])						*getchar()*
 			:  endwhile
 			:endfunction
 <
-		You may also receive synthetic characters, such as
-		|<LeftMouse>|. Often you will want to ignore this and get
-		another character: >
-			:function GetKey()
-			:  let c = getchar()
-			:  while c == "\<LeftMouse>"
-			:    let c = getchar()
-			:  endwhile
-			:  return c
-			:endfunction
-
 getcharmod()						*getcharmod()*
 		The result is a Number which is the state of the modifiers for
 		the last obtained character with getchar() or in another way.

src/nvim/api/vim.c

@@ -1210,9 +1210,13 @@ Dictionary nvim_get_namespaces(void)
 ///
 /// Compare |:put| and |p| which are always linewise.
 ///
-/// @param lines contents
+/// @param lines  |readfile()|-style list of lines. |channel-lines|
-/// @param type type ("c", "l", "b") or empty to guess from contents
+/// @param type  Edit behavior:
-/// @param direction behave like |P| instead of |p|
+///              - "b" |blockwise-visual| mode
+///              - "c" |characterwise| mode
+///              - "l" |linewise| mode
+///              - ""  guess by contents
+/// @param direction  Behave like |P| instead of |p|
 /// @param[out] err Error details, if any
 void nvim_put(ArrayOf(String) lines, String type, Boolean direction,
               Error *err)

src/nvim/tui/input.c

@@ -104,9 +104,9 @@ static Array string_to_array(const String input)
 {
   Array ret = ARRAY_DICT_INIT;
   for (size_t i = 0; i < input.size; i++) {
-    const char *const start = input.data + i;
+    const char *start = input.data + i;
-    const size_t line_len
+    const char *end = xmemscan(start, NL, input.size - i);
-      = (size_t)((char *)xmemscan(start, NL, input.size - i) - start);
+    const size_t line_len = (size_t)(end - start);
     i += line_len;
 
     String s = {
@@ -115,6 +115,11 @@ static Array string_to_array(const String input)
     };
     memchrsub(s.data, NUL, NL, line_len);
     ADD(ret, STRING_OBJ(s));
+    // If line ends at end-of-buffer, add empty final item.
+    // This is "readfile()-style", see also ":help channel-lines".
+    if (i + 1 == input.size && end[0] == NL) {
+      ADD(ret, STRING_OBJ(cchar_to_string(NUL)));
+    }
   }
 
   return ret;

test/functional/terminal/tui_spec.lua

@@ -189,20 +189,20 @@ describe('TUI', function()
   it('paste: exactly 64 bytes #10311', function()
     -- "bracketed paste"
     feed_data('i\027[200~'..string.rep('z', 64)..'\027[201~')
-    feed_data('\003')  -- CTRL-C
+    feed_data(' end')
     screen:expect([[
       zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz|
-      zzzzzzzzzzzzz{1:z}                                    |
+      zzzzzzzzzzzzzz end{1: }                               |
       {4:~                                                 }|
       {4:~                                                 }|
       {5:[No Name] [+]                                     }|
-                                                        |
+      {3:-- INSERT --}                                      |
       {3:-- TERMINAL --}                                    |
     ]])
   end)
 
   it('paste: big burst of input', function()
-    feed_command('set ruler')
+    feed_data(':set ruler\013')
     local t = {}
     for i = 1, 3000 do
       t[i] = 'item ' .. tostring(i)
@@ -210,12 +210,13 @@ describe('TUI', function()
     local expected = table.concat(t, '\n')
     -- "bracketed paste"
     feed_data('i\027[200~'..expected..'\027[201~')
+    feed_data(' end')
     screen:expect([[
       item 2997                                         |
       item 2998                                         |
       item 2999                                         |
-      item 3000{1: }                                        |
+      item 3000 end{1: }                                    |
-      {5:[No Name] [+]                   3000,10        Bot}|
+      {5:[No Name] [+]                   3000,14        Bot}|
       {3:-- INSERT --}                                      |
       {3:-- TERMINAL --}                                    |
     ]])