Re: [PATCH] commit: replace rebase/sequence booleans with single pick_state enum

[Phillip Wood <phillip.wood123@gmail.com>]

Hi Ben

On 17/01/2020 13:45, Ben Curtis via GitGitGadget wrote:
> From: Ben Curtis <nospam@nowsci.com>
> 
> In 116a408,

That commit is no longer in pu, it has been replaced by 430b75f720 
("commit: give correct advice for empty commit during a rebase", 
2019-12-06). There is now a preparatory commit 8d57f75749 ("commit: use 
enum value for multiple cherry-picks", 2019-12-06) which replaces the 
booleans with an enum. I need to reroll the series 
(pw/advise-rebase-skip) that contains them, if you've got any comments 
please let me know.

Best Wishes

Phillip

  the boolean `rebase_in_progress` was introduced by dscho to
> handle instances when cherry-pick and rebase were occuring at the same time.
> This created a situation where two independent booleans were being used
> to define the state of git at a point in time.
> 
> Under his recommendation to follow guidance from Junio, specifically
> `https://public-inbox.org/git/xmqqr234i2q0.fsf@gitster-ct.c.googlers.com/`,
> it was decided that an `enum` that defines the state of git would be a
> more effective path forward.
> 
> Tasks completed:
>    - Remove multiple booleans `rebase_in_progress` and `sequencer_in_use` and
> replaced with a single `pick_state` enum that determines if, when
> cherry-picking, we are in a rebase, multi-pick, or single-pick state
>    - Converted double `if` statement to `if/else if` prioritizing `REBASE` to
> continue to disallow cherry pick in rebase.
> 
> Signed-off-by: Ben Curtis <nospam@nowsci.com>
> ---
>      commit: replaced rebase/sequence booleans with single pick_state enum
>      
>      Addresses https://github.com/gitgitgadget/git/issues/426
>      
>      Previous discussions from @dscho and Junio led to the decision to merge
>      two independent booleans into a single enum to track the state of git
>      during a cherry-pick leading to this PR/patch.
> 
> Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-531%2FFmstrat%2Fjs%2Fadvise-rebase-skip-v1
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-531/Fmstrat/js/advise-rebase-skip-v1
> Pull-Request: https://github.com/gitgitgadget/git/pull/531
> 
>   builtin/commit.c | 24 +++++++++++++++---------
>   1 file changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/builtin/commit.c b/builtin/commit.c
> index 2beae13620..84f7e69cb1 100644
> --- a/builtin/commit.c
> +++ b/builtin/commit.c
> @@ -125,7 +125,11 @@ static enum commit_msg_cleanup_mode cleanup_mode;
>   static const char *cleanup_arg;
>   
>   static enum commit_whence whence;
> -static int sequencer_in_use, rebase_in_progress;
> +static enum {
> +	SINGLE_PICK,
> +	MULTI_PICK,
> +	REBASE
> +} pick_state;
>   static int use_editor = 1, include_status = 1;
>   static int have_option_m;
>   static struct strbuf message = STRBUF_INIT;
> @@ -184,10 +188,12 @@ static void determine_whence(struct wt_status *s)
>   		whence = FROM_MERGE;
>   	else if (file_exists(git_path_cherry_pick_head(the_repository))) {
>   		whence = FROM_CHERRY_PICK;
> -		if (file_exists(git_path_seq_dir()))
> -			sequencer_in_use = 1;
>   		if (file_exists(git_path_rebase_merge_dir()))
> -			rebase_in_progress = 1;
> +			pick_state = REBASE;
> +		else if (file_exists(git_path_seq_dir()))
> +			pick_state = MULTI_PICK;
> +		else
> +			pick_state = SINGLE_PICK;
>   	}
>   	else
>   		whence = FROM_COMMIT;
> @@ -459,7 +465,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
>   		if (whence == FROM_MERGE)
>   			die(_("cannot do a partial commit during a merge."));
>   		else if (whence == FROM_CHERRY_PICK) {
> -			if (rebase_in_progress && !sequencer_in_use)
> +			if (pick_state == REBASE)
>   				die(_("cannot do a partial commit during a rebase."));
>   			die(_("cannot do a partial commit during a cherry-pick."));
>   		}
> @@ -958,9 +964,9 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
>   			fputs(_(empty_amend_advice), stderr);
>   		else if (whence == FROM_CHERRY_PICK) {
>   			fputs(_(empty_cherry_pick_advice), stderr);
> -			if (sequencer_in_use)
> +			if (pick_state == MULTI_PICK)
>   				fputs(_(empty_cherry_pick_advice_multi), stderr);
> -			else if (rebase_in_progress)
> +			else if (pick_state == REBASE)
>   				fputs(_(empty_rebase_advice), stderr);
>   			else
>   				fputs(_(empty_cherry_pick_advice_single), stderr);
> @@ -1167,7 +1173,7 @@ static int parse_and_validate_options(int argc, const char *argv[],
>   		if (whence == FROM_MERGE)
>   			die(_("You are in the middle of a merge -- cannot amend."));
>   		else if (whence == FROM_CHERRY_PICK) {
> -			if (rebase_in_progress && !sequencer_in_use)
> +			if (pick_state == REBASE)
>   				die(_("You are in the middle of a rebase -- cannot amend."));
>   			die(_("You are in the middle of a cherry-pick -- cannot amend."));
>   		}
> @@ -1643,7 +1649,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
>   		if (!reflog_msg)
>   			reflog_msg = (whence != FROM_CHERRY_PICK)
>   					? "commit"
> -					: rebase_in_progress && !sequencer_in_use
> +					: pick_state == REBASE
>   					? "commit (rebase)"
>   					: "commit (cherry-pick)";
>   		commit_list_insert(current_head, &parents);
> 
> base-commit: 116a408b6ffcb2496ebf10dfce1364a42e8f0b32
>