Merge #5975 from jamessan/execute-with-attrs

execute: Correctly capture output with highlight attributes

src/nvim/message.c

@@ -2455,15 +2455,6 @@ static void redir_write(char_u *str, int maxlen)
     return;
   }
 
-  // Append output for execute().
-  if (capture_ga) {
-    size_t len = 0;
-    while (str[len] && (maxlen < 0 ? 1 : (len < (size_t)maxlen))) {
-      len++;
-    }
-    ga_concat_len(capture_ga, (const char *)str, len);
-  }
-
   /* Don't do anything for displaying prompts and the like. */
   if (redir_off)
     return;
@@ -2476,6 +2467,9 @@ static void redir_write(char_u *str, int maxlen)
     /* If the string doesn't start with CR or NL, go to msg_col */
     if (*s != '\n' && *s != '\r') {
       while (cur_col < msg_col) {
+        if (capture_ga) {
+          ga_concat_len(capture_ga, " ", 1);
+        }
         if (redir_reg) {
           write_reg_contents(redir_reg, (char_u *)" ", 1, true);
         } else if (redir_vname) {
@@ -2490,8 +2484,11 @@ static void redir_write(char_u *str, int maxlen)
       }
     }
 
+    size_t len = maxlen == -1 ? STRLEN(s) : (size_t)maxlen;
+    if (capture_ga) {
+      ga_concat_len(capture_ga, (const char *)str, len);
+    }
     if (redir_reg) {
-      size_t len = maxlen == -1 ? STRLEN(s) : (size_t)maxlen;
       write_reg_contents(redir_reg, s, len, true);
     }
     if (redir_vname) {
@@ -2500,7 +2497,7 @@ static void redir_write(char_u *str, int maxlen)
 
     /* Write and adjust the current column. */
     while (*s != NUL && (maxlen < 0 || (int)(s - str) < maxlen)) {
-      if (!redir_reg && !redir_vname)
+      if (!redir_reg && !redir_vname && !capture_ga)
         if (redir_fd != NULL)
           putc(*s, redir_fd);
       if (verbose_fd != NULL)

test/functional/eval/execute_spec.lua

@@ -8,6 +8,7 @@ local exc_exec = helpers.exc_exec
 local funcs = helpers.funcs
 local Screen = require('test.functional.ui.screen')
 local command = helpers.command
+local feed = helpers.feed
 
 describe('execute()', function()
   before_each(clear)
@@ -21,7 +22,11 @@ describe('execute()', function()
     eq("\nfoo\nbar", funcs.execute({'echo "foo"', 'echo "bar"'}))
   end)
 
-  it('supports nested redirection', function()
+  it('supports nested execute("execute(...)")', function()
+    eq('42', funcs.execute([[echon execute("echon execute('echon 42')")]]))
+  end)
+
+  it('supports nested :redir to a variable', function()
     source([[
     function! g:Foo()
       let a = ''
@@ -33,14 +38,39 @@ describe('execute()', function()
     function! g:Bar()
       let a = ''
       redir => a
+      silent echon "bar1"
       call g:Foo()
+      silent echon "bar2"
       redir END
+      silent echon "bar3"
       return a
     endfunction
     ]])
-    eq('foo', funcs.execute('call g:Bar()'))
+    eq('top1bar1foobar2bar3', funcs.execute('echon "top1"|call g:Bar()'))
+  end)
 
-    eq('42', funcs.execute([[echon execute("echon execute('echon 42')")]]))
+  it('supports nested :redir to a register', function()
+    source([[
+    let @a = ''
+    function! g:Foo()
+      redir @a>>
+      silent echon "foo"
+      redir END
+      return @a
+    endfunction
+    function! g:Bar()
+      redir @a>>
+      silent echon "bar1"
+      call g:Foo()
+      silent echon "bar2"
+      redir END
+      silent echon "bar3"
+      return @a
+    endfunction
+    ]])
+    eq('top1bar1foobar2bar3', funcs.execute('echon "top1"|call g:Bar()'))
+    -- :redir itself doesn't nest, so the redirection ends in g:Foo
+    eq('bar1foo', eval('@a'))
   end)
 
   it('captures a transformed string', function()
@@ -69,6 +99,25 @@ describe('execute()', function()
     eq('Vim:E729: using Funcref as a String', ret)
   end)
 
+  it('captures output with highlights', function()
+    eq('\nErrorMsg       xxx ctermfg=15 ctermbg=1 guifg=White guibg=Red',
+       eval('execute("hi ErrorMsg")'))
+  end)
+
+  it('does not corrupt the command display #5422', function()
+    local screen = Screen.new(70, 5)
+    screen:attach()
+    feed(':echo execute("hi ErrorMsg")<CR>')
+    screen:expect([[
+      ~                                                                     |
+      ~                                                                     |
+      :echo execute("hi ErrorMsg")                                          |
+      ErrorMsg       xxx ctermfg=15 ctermbg=1 guifg=White guibg=Red         |
+      Press ENTER or type command to continue^                               |
+    ]])
+    feed('<CR>')
+  end)
+
   -- This matches Vim behavior.
   it('does not capture shell-command output', function()
     eq('\n:!echo "foo"\13\n', funcs.execute('!echo "foo"'))