git-prompt: work under set -u

From: Elijah Newren <[email protected]>

Commit afda36dbf3 ("git-prompt: include sparsity state as well", 2020-06-21) added the use of some variables to control how to show sparsity state in the git prompt, but implicitly assumed that undefined variables would be treated as the empty string. This breaks users who run under 'set -u'; fix the code to be more explicit.

---
git-prompt: work under set -u

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1024%2Fnewren%2Ffix-git-prompt-under-set-u-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1024/newren/fix-git-prompt-under-set-u-v1
Pull-Request: https://github.com/git/git/pull/1024

 contrib/completion/git-prompt.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

index 4640a1535d15..db7c0068fb55 100644
@@ -433,8 +433,8 @@ __git_ps1 ()
 	fi
 
 	local sparse=""
-	if [ -z "${GIT_PS1_COMPRESSSPARSESTATE}" ] &&
-	   [ -z "${GIT_PS1_OMITSPARSESTATE}" ] &&
+	if [ -z "${GIT_PS1_COMPRESSSPARSESTATE-}" ] &&
+	   [ -z "${GIT_PS1_OMITSPARSESTATE-}" ] &&
 	   [ "$(git config --bool core.sparseCheckout)" = "true" ]; then
 		sparse="|SPARSE"
 	fi

@@ -543,7 +543,7 @@ __git_ps1 ()
 			u="%${ZSH_VERSION+%}"
 		fi
 
-		if [ -n "${GIT_PS1_COMPRESSSPARSESTATE}" ] &&
+		if [ -n "${GIT_PS1_COMPRESSSPARSESTATE-}" ] &&
 		   [ "$(git config --bool core.sparseCheckout)" = "true" ]; then
 			h="?"
 		fi

base-commit: df6c4f722c94641d5a9ea5496511f7043433abc2

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