vim-patch:9.1.0573: ex: no implicit print for single addresses

Problem:  ex: no implicit print for single addresses
Solution: explicitly print even during single addresses,
          as requested by POSIX (Mohamed Akram)

See the POSIX behaviour here:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ex.html#tag_20_40_13_03
Section 6b

closes: vim/vim#15230

c25a7084e9

Co-authored-by: Mohamed Akram <mohd.akram@outlook.com>

runtime/doc/motion.txt

@@ -342,6 +342,7 @@ gg			Goto line [count], default first line, on the first
 
 							*:[range]*
 :[range]		Set the cursor on the last line number in [range].
+			In Ex mode, print the lines in [range].
 			[range] can also be just one line number, e.g., ":1"
 			or ":'m".
 			In contrast with |G| this command does not modify the

src/nvim/ex_docmd.c

@@ -2079,6 +2079,7 @@ static char *do_one_cmd(char **cmdlinep, int flags, cstack_T *cstack, LineGetter
     if (ea.skip) {  // skip this if inside :if
       goto doend;
     }
+    assert(errormsg == NULL);
     errormsg = ex_range_without_command(&ea);
     goto doend;
   }
@@ -2431,7 +2432,7 @@ static char *ex_range_without_command(exarg_T *eap)
 {
   char *errormsg = NULL;
 
-  if (*eap->cmd == '|' || (exmode_active && eap->line1 != eap->line2)) {
+  if (*eap->cmd == '|' || exmode_active) {
     eap->cmdidx = CMD_print;
     eap->argt = EX_RANGE | EX_COUNT | EX_TRLBAR;
     if ((errormsg = invalid_range(eap)) == NULL) {

src/nvim/getchar.c

@@ -2729,7 +2729,7 @@ static int vgetorpeek(bool advance)
             timedout = true;
             continue;
           }
-          // In Ex-mode \n is compatible with original Vim behaviour.
+
           // For the command line only CTRL-C always breaks it.
           // For the cmdline window: Alternate between ESC and
           // CTRL-C: ESC for most situations and CTRL-C to close the

test/old/testdir/setup.vim

@@ -32,8 +32,8 @@ if exists('s:did_load')
   endif
   if g:testname !~ 'test_mapping.vim$'
     " Make "Q" switch to Ex mode.
-    " This does not work for all tests.
+    " This does not work for all tests as Nvim only supports Vim Ex mode.
-    nnoremap Q gQ
+    nnoremap Q gQ<Cmd>call<SID>ExStart()<CR>
   endif
 endif
 
@@ -45,6 +45,21 @@ if exists('s:did_load')
 endif
 let s:did_load = 1
 
+func s:ExStart()
+  call feedkeys($"\<Cmd>call{expand('<SID>')}ExMayEnd()\<CR>")
+endfunc
+
+func s:ExMayEnd()
+  " When :normal runs out of characters in Vim, the behavior is different in
+  " normal Ex mode vs. Vim Ex mode.
+  " - In normal Ex mode, "\n" is used.
+  " - In Vim Ex mode, Ctrl-C is used.
+  " Nvim only supports Vim Ex mode, so emulate the normal Ex mode behavior.
+  if state('m') == '' && mode(1) == 'cv' && getcharstr(1) == "\<C-C>"
+    call feedkeys("\n")
+  endif
+endfunc
+
 " Clear Nvim default user commands, mappings and menus.
 comclear
 mapclear

test/old/testdir/test_ex_mode.vim

@@ -282,4 +282,15 @@ func Test_ex_mode_large_indent()
 endfunc
 
 
+" Testing implicit print command
+func Test_implicit_print()
+  new
+  call setline(1, ['one', 'two', 'three'])
+  call feedkeys('Q:let a=execute(":1,2")', 'xt')
+  call feedkeys('Q:let b=execute(":3")', 'xt')
+  call assert_equal('one two', a->split('\n')->join(' '))
+  call assert_equal('three', b->split('\n')->join(' '))
+  bw!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab