Re: [PATCH 22/25] progress.c: add a stop_progress_early() function

> In cases where we error out during processing or otherwise miss
> initial "total" estimate we'll still want to show a "done" message and
> end our trace2 region, but it won't be true that our total ==
> last_update at the end.
> 
> So let's add a "last_update" and this stop_progress_early() function
> to handle that edge case, this will be used in a subsequent commit.
> 
> We could also use a total=0 in such cases, but that would make the
> progress output worse for the common non-erroring case. Let's instead
> note that we didn't reach the total count, and snap the progress bar
> to "100%, done" at the end.
> 
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> ---
>   progress.c | 20 ++++++++++++++++++++
>   progress.h |  2 ++
>   2 files changed, 22 insertions(+)
> 
> diff --git a/progress.c b/progress.c
> index 35847d3a7f2..c1cb01ba975 100644
> --- a/progress.c
> +++ b/progress.c
> @@ -40,6 +40,8 @@ static void display(struct progress *progress, uint64_t n,
>   	const char *tp;
>   	int show_update = 0;
>   
> +	progress->last_update = n;
> +
>   	if (progress->delay && (!progress_update || --progress->delay))
>   		return;
>   
> @@ -413,3 +415,21 @@ void stop_progress_msg(struct progress **p_progress, const char *msg)
>   	free(progress->throughput);
>   	free(progress);
>   }
> +
> +void stop_progress_early(struct progress **p_progress)
> +{
> +	struct progress *progress;
> +	struct strbuf sb = STRBUF_INIT;
> +
> +	if (!p_progress)
> +		BUG("don't provide NULL to stop_progress_early");
> +	progress = *p_progress;
> +	if (!progress)
> +		return;
> +
> +	strbuf_addf(&sb, _(", done at %"PRIuMAX" items, expected %"PRIuMAX"."),
> +		    progress->total, progress->last_update);

> +	progress->total = progress->last_update;
> +	stop_progress_msg(p_progress, sb.buf);
> +	strbuf_release(&sb);
> +}
> diff --git a/progress.h b/progress.h
> index ba38447d104..5c5d027d1a0 100644
> --- a/progress.h
> +++ b/progress.h
> @@ -23,6 +23,7 @@ struct progress {
>   	struct strbuf status;
>   	size_t status_len_utf8;
>   
> +	uint64_t last_update;
>   	uint64_t last_value;
>   	uint64_t total;
>   	unsigned last_percent;
> @@ -56,5 +57,6 @@ struct progress *start_delayed_sparse_progress(const char *title,
>   					       uint64_t total);
>   void stop_progress(struct progress **progress);
>   void stop_progress_msg(struct progress **progress, const char *msg);
> +void stop_progress_early(struct progress **p_progress);
>   
>   #endif
>