[PATCH] filter-branch: add passed/remaining seconds on progress

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From: Gabor Bernat <gabor.bernat@xxxxxxxxxxxxx>

adds seconds progress and estimated seconds time if getting the current
timestamp is supported by the date +%s command

Signed-off-by: Gabor Bernat <gabor.bernat@xxxxxxxxxxxxx>
---

I've submitted this first to this list as a feature request, however
in the meantime with the help of Jeff King <peff@xxxxxxxx>, Junio C
Hamano <gitster@xxxxxxxxx>, Eric Sunshine <sunshine@xxxxxxxxxxxxxx>
and Mikael Magnusson <mikachu@xxxxxxxxx> came up with solution, so now
I submit it as a revised patch.

The current solution updates the progress for all commits until 1
second time is elapsed. Afterwards updates it at most once a second.

Ammended build up as agreed at [1].

[1] http://thread.gmane.org/gmane.comp.version-control.git/277314
---
 git-filter-branch.sh | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 5b3f63d..565144a 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -275,11 +275,41 @@ commits=$(wc -l <../revs | tr -d " ")
 test $commits -eq 0 && die "Found nothing to rewrite"
 
 # Rewrite the commits
+report_progress ()
+{
+if test -n "$progress"
+then
+	if test $git_filter_branch__commit_count -gt $next_sample_at
+	then
+		now_timestamp=$(date +%s)
+		elapsed_seconds=$(($now_timestamp - $start_timestamp))
+		remaining_second=$(( ($commits - $git_filter_branch__commit_count) * $elapsed_seconds / $git_filter_branch__commit_count ))
+		if test $elapsed_seconds -gt 0
+		then
+			next_sample_at=$(( ($elapsed_seconds + 1) * $git_filter_branch__commit_count / $elapsed_seconds ))
+		else
+			next_sample_at=$(($next_sample_at + 1))
+		fi
+		progress=" ($elapsed_seconds seconds passed, remaining $remaining_second predicted)"
+	fi
+fi
+printf "\rRewrite $commit ($git_filter_branch__commit_count/$commits)$progress"
+}
 
 git_filter_branch__commit_count=0
+
+progress= start_timestamp=
+if date '+%s' 2>/dev/null | grep -q '^[0-9][0-9]*$'
+then
+		next_sample_at=0
+		progress="dummy to ensure this is not empty"
+		start_timestamp=$(date '+%s')
+fi
+
 while read commit parents; do
 	git_filter_branch__commit_count=$(($git_filter_branch__commit_count+1))
-	printf "\rRewrite $commit ($git_filter_branch__commit_count/$commits)"
+
+	report_progress
 
 	case "$filter_subdir" in
 	"")
-- 
2.6.0.rc0.3.gb3280a4

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