From 3c49ed1e96df6513528729feee6e61fd101dfef8 Mon Sep 17 00:00:00 2001
From: Foo <kp-pav@yandex.ru>
Date: Fri, 2 Jun 2017 21:12:05 +0300
Subject: [PATCH 1/2] Check that bash has (no) $PIPESTATUS support before using
 it

Ref #1782
---
 powerline/bindings/bash/powerline.sh | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/powerline/bindings/bash/powerline.sh b/powerline/bindings/bash/powerline.sh
index 4ec0d72c..618cb0d0 100644
--- a/powerline/bindings/bash/powerline.sh
+++ b/powerline/bindings/bash/powerline.sh
@@ -31,10 +31,26 @@ _powerline_return() {
 	return $1
 }
 
+_POWERLINE_HAS_PIPESTATUS=
+
+_powerline_has_pipestatus() {
+	if test -z "$_POWERLINE_HAS_PIPESTATUS" ; then
+		_powerline_return 0 | _powerline_return 43
+		if test "${PIPESTATUS[*]}" = "0 43" ; then
+			_POWERLINE_HAS_PIPESTATUS=0
+		else
+			_POWERLINE_HAS_PIPESTATUS=1
+		fi
+	fi
+	return $_POWERLINE_HAS_PIPESTATUS
+}
+
 _powerline_status_wrapper() {
 	local last_exit_code=$? last_pipe_status=( "${PIPESTATUS[@]}" )
 
-	if test "$last_exit_code" != "${last_pipe_status[-1]}" ; then
+	if ! _powerline_has_pipestatus \
+	   || test "${#last_pipe_status[@]}" -eq "0" \
+	   || test "$last_exit_code" != "${last_pipe_status[-1]}" ; then
 		last_pipe_status=()
 	fi
 	"$@" $last_exit_code "${last_pipe_status[*]}"

From d3e5d99a20305d5f71e3d383d1005d232d3efcc9 Mon Sep 17 00:00:00 2001
From: Foo <kp-pav@yandex.ru>
Date: Fri, 2 Jun 2017 21:23:03 +0300
Subject: [PATCH 2/2] Do not spawn jobs

With previous variant of code first call has spawned a job which was perfectly
reproducibly visible in prompt at bash startup. In subsequent prompts job number
segment disappeared because result was cached, but it still was not good.
---
 powerline/bindings/bash/powerline.sh | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/powerline/bindings/bash/powerline.sh b/powerline/bindings/bash/powerline.sh
index 618cb0d0..db831fd5 100644
--- a/powerline/bindings/bash/powerline.sh
+++ b/powerline/bindings/bash/powerline.sh
@@ -31,17 +31,13 @@ _powerline_return() {
 	return $1
 }
 
-_POWERLINE_HAS_PIPESTATUS=
+_POWERLINE_HAS_PIPESTATUS="$(
+	_powerline_return 0 | _powerline_return 43
+	test "${PIPESTATUS[*]}" = "0 43"
+	echo "$?"
+)"
 
 _powerline_has_pipestatus() {
-	if test -z "$_POWERLINE_HAS_PIPESTATUS" ; then
-		_powerline_return 0 | _powerline_return 43
-		if test "${PIPESTATUS[*]}" = "0 43" ; then
-			_POWERLINE_HAS_PIPESTATUS=0
-		else
-			_POWERLINE_HAS_PIPESTATUS=1
-		fi
-	fi
 	return $_POWERLINE_HAS_PIPESTATUS
 }