Re: [PATCH v3] git-prompt: show presence of unresolved conflicts at command prompt

> From: Justin Donnelly <justinrdonnelly@gmail.com>
>
> If GIT_PS1_SHOWCONFLICTSTATE is set to "yes", show the word "CONFLICT"
> on the command prompt when there are unresolved conflicts.
>
> Example prompt: (main|CONFLICT)
>
> Signed-off-by: Justin Donnelly <justinrdonnelly@gmail.com>
> ---
>     Show 'CONFLICT' indicator at command prompt
>
>     This patch adds functionality for bash/zsh to show "CONFLICT" on the
>     prompt in cases where there are unresolved conflicts. The feature is
>     only enabled after setting an environment variable.
>
>     The conflict state is determined by running git ls-files --unmerged. In
>     my testing, the performance was very good. It took around 0.01 seconds
>     to run git ls-files --unmerged regardless of the number of conflicts, or
>     their depth, even on very large projects (Linux kernel). I got similar
>     performance running git diff --cached --quiet --diff-filter=U.
>
>     ------------------------------------------------------------------------
>
>     Changes since v2:
>
>      * There is now a single new test focused explicitly on this feature
>        instead of making copies of existing tests and modifying them.
>
>     Changes since v1:
>
>      * This feature is now disabled by default.
>      * Created new tests for conflict state (instead of modifying existing
>        tests).

>
> Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1302%2Fjustinrdonnelly%2Fconflict-indicator-v3
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1302/justinrdonnelly/conflict-indicator-v3
> Pull-Request: https://github.com/gitgitgadget/git/pull/1302
>
> Range-diff vs v2:
>
>  1:  7154d695426 ! 1:  2ea5c403924 git-prompt: show presence of unresolved conflicts at command prompt
>      @@ contrib/completion/git-prompt.sh: __git_ps1 ()
>        		if [ "${__git_printf_supports_v-}" != yes ]; then
>
>        ## t/t9903-bash-prompt.sh ##
>      -@@ t/t9903-bash-prompt.sh: test_expect_success 'prompt - rebase merge' '
>      - 	test_when_finished "git checkout main" &&
>      - 	test_must_fail git rebase --merge b1 b2 &&
>      - 	test_when_finished "git rebase --abort" &&
>      --	__git_ps1 >"$actual" &&
>      -+	(
>      -+		sane_unset GIT_PS1_SHOWCONFLICTSTATE &&
>      -+		__git_ps1 >"$actual"
>      -+	) &&
>      -+	test_cmp expected "$actual"
>      -+'
>      -+
>      -+test_expect_success 'prompt - rebase merge conflict' '
>      -+	printf " (b2|REBASE 1/3|CONFLICT)" >expected &&
>      -+	git checkout b2 &&
>      -+	test_when_finished "git checkout main" &&
>      -+	test_must_fail git rebase --merge b1 b2 &&
>      -+	test_when_finished "git rebase --abort" &&
>      -+	(
>      -+		GIT_PS1_SHOWCONFLICTSTATE="yes" &&
>      -+		__git_ps1 >"$actual"
>      -+	) &&
>      - 	test_cmp expected "$actual"
>      - '
>      -
>      -@@ t/t9903-bash-prompt.sh: test_expect_success 'prompt - rebase am' '
>      - 	test_when_finished "git checkout main" &&
>      - 	test_must_fail git rebase --apply b1 b2 &&
>      - 	test_when_finished "git rebase --abort" &&
>      --	__git_ps1 >"$actual" &&
>      -+	(
>      -+		sane_unset GIT_PS1_SHOWCONFLICTSTATE &&
>      -+		__git_ps1 >"$actual"
>      -+	) &&
>      -+	test_cmp expected "$actual"
>      -+'
>      -+
>      -+test_expect_success 'prompt - rebase am conflict' '
>      -+	printf " (b2|REBASE 1/3|CONFLICT)" >expected &&
>      -+	git checkout b2 &&
>      -+	test_when_finished "git checkout main" &&
>      -+	test_must_fail git rebase --apply b1 b2 &&
>      -+	test_when_finished "git rebase --abort" &&
>      -+	(
>      -+		GIT_PS1_SHOWCONFLICTSTATE="yes" &&
>      -+		__git_ps1 >"$actual"
>      -+	) &&
>      - 	test_cmp expected "$actual"
>      - '
>      -
>      -@@ t/t9903-bash-prompt.sh: test_expect_success 'prompt - merge' '
>      - 	test_when_finished "git checkout main" &&
>      - 	test_must_fail git merge b2 &&
>      - 	test_when_finished "git reset --hard" &&
>      --	__git_ps1 >"$actual" &&
>      -+	(
>      -+		sane_unset GIT_PS1_SHOWCONFLICTSTATE &&
>      -+		__git_ps1 >"$actual"
>      -+	) &&
>      -+	test_cmp expected "$actual"
>      -+'
>      -+
>      -+test_expect_success 'prompt - merge conflict' '
>      -+	printf " (b1|MERGING|CONFLICT)" >expected &&
>      -+	git checkout b1 &&
>      -+	test_when_finished "git checkout main" &&
>      -+	test_must_fail git merge b2 &&
>      -+	test_when_finished "git reset --hard" &&
>      -+	(
>      -+		GIT_PS1_SHOWCONFLICTSTATE="yes" &&
>      -+		__git_ps1 >"$actual"
>      -+	) &&
>      - 	test_cmp expected "$actual"
>      - '
>      -
>      -@@ t/t9903-bash-prompt.sh: test_expect_success 'prompt - cherry-pick' '
>      - 	printf " (main|CHERRY-PICKING)" >expected &&
>      - 	test_must_fail git cherry-pick b1 b1^ &&
>      - 	test_when_finished "git cherry-pick --abort" &&
>      --	__git_ps1 >"$actual" &&
>      -+	(
>      -+		sane_unset GIT_PS1_SHOWCONFLICTSTATE &&
>      -+		__git_ps1 >"$actual"
>      -+	) &&
>      - 	test_cmp expected "$actual" &&
>      - 	git reset --merge &&
>      - 	test_must_fail git rev-parse CHERRY_PICK_HEAD &&
>      -@@ t/t9903-bash-prompt.sh: test_expect_success 'prompt - cherry-pick' '
>      +@@ t/t9903-bash-prompt.sh: test_expect_success 'prompt - hide if pwd ignored - inside gitdir' '
>        	test_cmp expected "$actual"
>        '
>
>      -+test_expect_success 'prompt - cherry-pick conflict' '
>      -+	printf " (main|CHERRY-PICKING|CONFLICT)" >expected &&
>      -+	test_must_fail git cherry-pick b1 b1^ &&
>      -+	test_when_finished "git cherry-pick --abort" &&
>      ++test_expect_success 'prompt - conflict indicator' '
>      ++	printf " (main|CONFLICT)" >expected &&
>      ++	echo "stash" >file &&
>      ++	git stash &&
>      ++	test_when_finished "git stash drop" &&
>      ++	echo "commit" >file &&
>      ++	git commit -m "commit" file &&
>      ++	test_when_finished "git reset --hard HEAD~" &&
>      ++	test_must_fail git stash apply &&
>       +	(
>       +		GIT_PS1_SHOWCONFLICTSTATE="yes" &&
>       +		__git_ps1 >"$actual"
>      @@ t/t9903-bash-prompt.sh: test_expect_success 'prompt - cherry-pick' '
>       +	test_cmp expected "$actual"
>       +'
>       +
>      - test_expect_success 'prompt - revert' '
>      - 	printf " (main|REVERTING)" >expected &&
>      - 	test_must_fail git revert b1^ b1 &&
>      + test_done
>
>
>  contrib/completion/git-prompt.sh | 12 +++++++++++-
>  t/t9903-bash-prompt.sh           | 16 ++++++++++++++++
>  2 files changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
> index 1435548e004..57972c2845c 100644
> --- a/contrib/completion/git-prompt.sh
> +++ b/contrib/completion/git-prompt.sh
> @@ -84,6 +84,10 @@
>  # single '?' character by setting GIT_PS1_COMPRESSSPARSESTATE, or omitted
>  # by setting GIT_PS1_OMITSPARSESTATE.
>  #
> +# If you would like to see a notification on the prompt when there are
> +# unresolved conflicts, set GIT_PS1_SHOWCONFLICTSTATE to "yes". The
> +# prompt will include "|CONFLICT".
> +#
>  # If you would like to see more information about the identity of
>  # commits checked out as a detached HEAD, set GIT_PS1_DESCRIBE_STYLE
>  # to one of these values:
> @@ -508,6 +512,12 @@ __git_ps1 ()
>  		r="$r $step/$total"
>  	fi
>
> +	local conflict="" # state indicator for unresolved conflicts
> +	if [[ "${GIT_PS1_SHOWCONFLICTSTATE}" == "yes" ]] &&
> +	   [[ $(git ls-files --unmerged 2>/dev/null) ]]; then
> +		conflict="|CONFLICT"
> +	fi
> +
>  	local w=""
>  	local i=""
>  	local s=""
> @@ -572,7 +582,7 @@ __git_ps1 ()
>  	fi
>
>  	local f="$h$w$i$s$u$p"
> -	local gitstring="$c$b${f:+$z$f}${sparse}$r${upstream}"
> +	local gitstring="$c$b${f:+$z$f}${sparse}$r${upstream}${conflict}"
>
>  	if [ $pcmode = yes ]; then
>  		if [ "${__git_printf_supports_v-}" != yes ]; then
> diff --git a/t/t9903-bash-prompt.sh b/t/t9903-bash-prompt.sh
> index 6a30f5719c3..d459fae6551 100755
> --- a/t/t9903-bash-prompt.sh
> +++ b/t/t9903-bash-prompt.sh
> @@ -759,4 +759,20 @@ test_expect_success 'prompt - hide if pwd ignored - inside gitdir' '
>  	test_cmp expected "$actual"
>  '
>
> +test_expect_success 'prompt - conflict indicator' '
> +	printf " (main|CONFLICT)" >expected &&
> +	echo "stash" >file &&
> +	git stash &&
> +	test_when_finished "git stash drop" &&
> +	echo "commit" >file &&
> +	git commit -m "commit" file &&
> +	test_when_finished "git reset --hard HEAD~" &&
> +	test_must_fail git stash apply &&
> +	(
> +		GIT_PS1_SHOWCONFLICTSTATE="yes" &&
> +		__git_ps1 >"$actual"
> +	) &&
> +	test_cmp expected "$actual"
> +'
> +
>  test_done
>
> base-commit: 9bf691b78cf906751e65d65ba0c6ffdcd9a5a12c
> --
> gitgitgadget
>