pw: improve pw-pull pull request template message

Example output:

---
Subject: pull-request: bpf-next 2019-10-16

Hi David,

The following pull-request contains BPF updates for your *net-next* tree.

We've added 10 non-merge commits during the last 1 day(s) which contain
a total of 23 files changed, 413 insertions(+), 90 deletions(-).

The main changes are:

1) ..., from XYZ. Among others:

    - Blah blah sub item.

2) ..., from ABC.

Please consider pulling these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git

Thanks a lot!

Contributors in this PR are:

Andrii Nakryiko, Jakub Sitnicki, Jiri Pirko, Song Liu, Stanislav Fomichev

Thanks everyone!
---

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 10 insertions, 1 deletions

diff --git a/pw-pull b/pw-pull
index 0b4be4d..a40b926 100755
--- a/pw-pull
+++ b/pw-pull
@@ -15,6 +15,7 @@ remote=""
 since=""
 tree=""
 today=$(date +%Y-%m-%d)
+
 while true; do
   case "$1" in
     -s | --since ) since="$2"; shift 2 ;;
@@ -30,9 +31,17 @@ case $tree in
   bpf ) remote=(net git://git.kernel.org/pub/scm/linux/kernel/git/bpf/$tree.git) ;;
   * ) usage ;;
 esac
+
+old=$(git log $since -n 1 --format=%ct)
+new=$(git log HEAD   -n 1 --format=%ct)
+delta=$((($new - $old)/(60*60*24)+1))
+count=$(git rev-list --no-merges --count $since...HEAD)
+what=$(git diff --stat $since...HEAD | tail -n1)
+thanks=$(git log --no-merges $since...HEAD --format="%aN" | sort | uniq | sort -n | sed ':a;N;$!ba;s/\n/, /g' | fold -s -w73)
+
 file="pr-$tree-$today.patch"
 git request-pull $since ${remote[1]} > $file
-echo -e "Subject: pull-request: $tree $today\n\nHi David,\n\nThe following pull-request contains BPF updates for your *${remote[0]}* tree.\n\nThe main changes are:\n\n1) ..., from XYZ. Among others:\n\n    - Blah blah sub item.\n\n2) ..., from ABC.\n\nPlease consider pulling these changes from:\n\n  git://git.kernel.org/pub/scm/linux/kernel/git/bpf/$tree.git\n\nThanks a lot!\n\n----------------------------------------------------------------\n\n$(cat $file)" > $file
+echo -e "Subject: pull-request: $tree $today\n\nHi David,\n\nThe following pull-request contains BPF updates for your *${remote[0]}* tree.\n\nWe've added $count non-merge commits during the last $delta day(s) which contain\na total of$what.\n\nThe main changes are:\n\n1) ..., from XYZ. Among others:\n\n    - Blah blah sub item.\n\n2) ..., from ABC.\n\nPlease consider pulling these changes from:\n\n  git://git.kernel.org/pub/scm/linux/kernel/git/bpf/$tree.git\n\nThanks a lot!\n\nContributors in this PR are:\n\n$thanks\n\nThanks everyone!\n\n----------------------------------------------------------------\n\n$(cat $file)" > $file
 bug=$(grep -c gitolite $file)
 if [ "$bug" -gt "0" ]; then
   echo "PR not generated: using gitolite url, not public one!"