From: Gabor Bernat <gabor.ber...@gravityrd.com>

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.ber...@gravityrd.com>
---

I've submitted this first to this list as a feature request, however
in the meantime with the help of Jeff King <p...@peff.net>, Junio C
Hamano <gits...@pobox.com>, Eric Sunshine <sunsh...@sunshineco.com>
and Mikael Magnusson <mika...@gmail.com> 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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