feat(golangci-lint): add fallback 3rd party completion loader

Author: scop

completions/Makefile.am

@@ -137,6 +137,7 @@ bashcomp_DATA = 2to3 \
 		gnokii \
 		gnome-mplayer \
 		gnome-screenshot \
+		_golangci-lint \
 		gpasswd \
 		gpg \
 		gpg2 \

completions/_golangci-lint

@@ -0,0 +1,19 @@
+# 3rd party completion loader for commands emitting        -*- shell-script -*-
+# their completion using "$cmd completion bash".
+# For example, many Go programs using https://github.com/spf13/cobra do.
+#
+# This serves as a fallback in case the completion is not installed otherwise.
+
+# shellcheck disable=SC2168 # "local" is ok, assume sourced by __load_completion
+local _comp__load_3rdparty_reset_shopt=$(shopt -po posix)
+set +o posix
+
+. <("$1" completion bash 2>/dev/null)
+
+$_comp__load_3rdparty_reset_shopt
+
+{
+    complete -p "$1" || complete -p "${1##*/}"
+} &>/dev/null
+
+# ex: filetype=sh

test/fallback/completions/Makefile.am

@@ -6,6 +6,7 @@ EXTRA_DIST = \
 	dmesg \
 	eject \
 	gh \
+	golangci-lint \
 	hexdump \
 	hwclock \
 	ionice \

test/fallback/completions/golangci-lint

@@ -0,0 +1 @@
+../../../completions/_golangci-lint