On July 16, 2018 6:20:30 AM EDT, Antony Lee <anntzer.lee@gmail.com> wrote:
From 05c11d3e1a7fc0079fca4ccf3694a88a9d2d0146 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Mon, 16 Jul 2018 12:02:56 +0200
Subject: [PATCH] Set vim 'commentstring' option in ftplugin/PKGBUILD.vim.

This option enables, in particular, commenting plugings (e.g.
https://github.com/tomtom/tcomment_vim) to know how toggle comments on
PKGBUILDs. See FS#59321.

Signed-off-by: Antony Lee <anntzer.lee@gmail.com>
---
src/Makefile.am | 7 ++++++-
src/vim/ftplugin/PKGBUILD.vim | 4 ++++
2 files changed, 10 insertions(+), 1 deletion(-)
create mode 100644 src/vim/ftplugin/PKGBUILD.vim

diff --git a/src/Makefile.am b/src/Makefile.am
index 792da70..e756899 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -14,11 +14,15 @@ bin_SCRIPTS = \
bin_PROGRAMS = pacsort pactree

vim_ftdetect_dir = $(vim_dir)/ftdetect
+vim_ftplugin_dir = $(vim_dir)/ftplugin
vim_syntax_dir = $(vim_dir)/syntax

vim_ftdetect__DATA = \
vim/ftdetect/PKGBUILD.vim

+vim_ftplugin__DATA = \
+ vim/ftplugin/PKGBUILD.vim
+
vim_syntax__DATA = \
vim/syntax/PKGBUILD.vim

@@ -62,7 +66,8 @@ EXTRA_DIST = \
rankmirrors.sh.in \
updpkgsums.sh.in \
vim/syntax/PKGBUILD.vim \
- vim/ftdetect/PKGBUILD.vim
+ vim/ftdetect/PKGBUILD.vim \
+ vim/ftplugin/PKGBUILD.vim

# Files that should be removed, but which Automake does not know.
MOSTLYCLEANFILES = $(OURSCRIPTS) $(OURFILES) *.tmp
diff --git a/src/vim/ftplugin/PKGBUILD.vim b/src/vim/ftplugin/PKGBUILD.vim
new file mode 100644
index 0000000..cbb46a9
--- /dev/null
+++ b/src/vim/ftplugin/PKGBUILD.vim
@@ -0,0 +1,4 @@
+if exists("b:did_ftplugin") | finish | endif
+let b:did_ftplugin = 1
+
+setlocal commentstring=#\ %s

Did you send this patch using `git send-email`? Can't seem to apply it.
--
Best,
polyzen