From 6a7af8e2dbcb768a768831d9e6355c855c215ebc Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Tue, 25 Jun 2019 21:34:26 +0200
Subject: patch 8.1.1593: filetype not detected for C++ header files without
 extension

Problem:    Filetype not detected for C++ header files without extension.
Solution:   Recognize the file by the Emacs file mode. (Dmitry Ilyin,
            closes #4593)
---
 runtime/scripts.vim           | 13 +++++++++----
 src/testdir/test_filetype.vim |  2 ++
 src/version.c                 |  2 ++
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/runtime/scripts.vim b/runtime/scripts.vim
index ab66c0c0a..8d460cd31 100644
--- a/runtime/scripts.vim
+++ b/runtime/scripts.vim
@@ -195,7 +195,7 @@ else
   if s:line1 =~# '^:$'
     call dist#ft#SetFileTypeSH(s:line1)	" defined in filetype.vim
 
-    " Z shell scripts
+  " Z shell scripts
   elseif s:line1 =~# '^#compdef\>' || s:line1 =~# '^#autoload\>' ||
         \ "\n".s:line1."\n".s:line2."\n".s:line3."\n".s:line4."\n".s:line5 =~# '\n\s*emulate\s\+\%(-[LR]\s\+\)\=[ckz]\=sh\>'
     set ft=zsh
@@ -204,15 +204,20 @@ else
   elseif s:line1 =~# '^From \([a-zA-Z][a-zA-Z_0-9\.=-]*\(@[^ ]*\)\=\|-\) .* \(19\|20\)\d\d$'
     set ft=mail
 
-    " Mason
+  " Mason
   elseif s:line1 =~# '^<[%&].*>'
     set ft=mason
 
-    " Vim scripts (must have '" vim' as the first line to trigger this)
+  " Vim scripts (must have '" vim' as the first line to trigger this)
   elseif s:line1 =~# '^" *[vV]im$'
     set ft=vim
 
-    " MOO
+  " libcxx and libstdc++ standard library headers like "iostream" do not have
+  " an extension, recognize the Emacs file mode.
+  elseif s:line1 =~? '-\*-.*C++.*-\*-'
+    set ft=cpp
+
+  " MOO
   elseif s:line1 =~# '^\*\* LambdaMOO Database, Format Version \%([1-3]\>\)\@!\d\+ \*\*$'
     set ft=moo
 
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 95fb62e71..37d8ceda9 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -586,6 +586,8 @@ let s:script_checks = {
       \ 'cfengine': [['#!/path/cfengine']],
       \ 'erlang': [['#!/path/escript']],
       \ 'haskell': [['#!/path/haskell']],
+      \ 'cpp': [['// Standard iostream objects -*- C++ -*-'],
+      \         ['// -*- C++ -*-']],
       \ }
 
 func Test_script_detection()
diff --git a/src/version.c b/src/version.c
index 5514b4b9c..c25c1ff10 100644
--- a/src/version.c
+++ b/src/version.c
@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1593,
 /**/
     1592,
 /**/
-- 
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