From 391c36279415d0b8c5dba1ba11b668add04be963 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Tue, 29 Sep 2020 20:59:17 +0200
Subject: patch 8.2.1771: synIDattr() cannot get the value of ctermul

Problem:    synIDattr() cannot get the value of ctermul.
Solution:   Add the "ul" value for "what". (closes #7037)
---
 runtime/doc/eval.txt           | 4 +++-
 src/evalfunc.c                 | 4 +++-
 src/highlight.c                | 7 ++++++-
 src/testdir/test_highlight.vim | 1 +
 src/version.c                  | 2 ++
 5 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 58c390ebb..6bf205d4e 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -10348,7 +10348,9 @@ synIDattr({synID}, {what} [, {mode}])			*synIDattr()*
 		"bg"		background color (as with "fg")
 		"font"		font name (only available in the GUI)
 				|highlight-font|
-		"sp"		special color (as with "fg") |highlight-guisp|
+		"sp"		special color for the GUI (as with "fg")
+				|highlight-guisp|
+		"ul"		underline color for cterm: number as a string
 		"fg#"		like "fg", but for the GUI and the GUI is
 				running the name in "#RRGGBB" form
 		"bg#"		like "fg#" for "bg"
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 2af4bc00d..cf1e26533 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -8604,7 +8604,9 @@ f_synIDattr(typval_T *argvars UNUSED, typval_T *rettv)
 		break;
 
 	case 'u':
-		if (STRLEN(what) <= 5 || TOLOWER_ASC(what[5]) != 'c')
+		if (TOLOWER_ASC(what[1]) == 'l')	// ul
+		    p = highlight_color(id, what, modec);
+		else if (STRLEN(what) <= 5 || TOLOWER_ASC(what[5]) != 'c')
 							// underline
 		    p = highlight_has_attr(id, HL_UNDERLINE, modec);
 		else
diff --git a/src/highlight.c b/src/highlight.c
index 0a014473b..56b198883 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -2684,13 +2684,14 @@ highlight_has_attr(
     char_u *
 highlight_color(
     int		id,
-    char_u	*what,	// "font", "fg", "bg", "sp", "fg#", "bg#" or "sp#"
+    char_u	*what,	// "font", "fg", "bg", "sp", "ul", "fg#", "bg#" or "sp#"
     int		modec)	// 'g' for GUI, 'c' for cterm, 't' for term
 {
     static char_u	name[20];
     int			n;
     int			fg = FALSE;
     int			sp = FALSE;
+    int			ul = FALSE;
     int			font = FALSE;
 
     if (id <= 0 || id > highlight_ga.ga_len)
@@ -2703,6 +2704,8 @@ highlight_color(
 	font = TRUE;
     else if (TOLOWER_ASC(what[0]) == 's' && TOLOWER_ASC(what[1]) == 'p')
 	sp = TRUE;
+    else if (TOLOWER_ASC(what[0]) == 'u' && TOLOWER_ASC(what[1]) == 'l')
+	ul = TRUE;
     else if (!(TOLOWER_ASC(what[0]) == 'b' && TOLOWER_ASC(what[1]) == 'g'))
 	return NULL;
     if (modec == 'g')
@@ -2749,6 +2752,8 @@ highlight_color(
     {
 	if (fg)
 	    n = HL_TABLE()[id - 1].sg_cterm_fg - 1;
+	else if (ul)
+	    n = HL_TABLE()[id - 1].sg_cterm_ul - 1;
 	else
 	    n = HL_TABLE()[id - 1].sg_cterm_bg - 1;
 	if (n < 0)
diff --git a/src/testdir/test_highlight.vim b/src/testdir/test_highlight.vim
index 05f215ae3..8bd03e2da 100644
--- a/src/testdir/test_highlight.vim
+++ b/src/testdir/test_highlight.vim
@@ -808,6 +808,7 @@ func Test_highlight_ctermul()
   call assert_notmatch('ctermul=', HighlightArgs('Normal'))
   highlight Normal ctermul=3
   call assert_match('ctermul=3', HighlightArgs('Normal'))
+  call assert_equal('3', synIDattr(synIDtrans(hlID('Normal')), 'ul'))
   highlight Normal ctermul=NONE
 endfunc
 
diff --git a/src/version.c b/src/version.c
index 26e63c2bd..d390212d8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1771,
 /**/
     1770,
 /**/
-- 
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