prepare-commit-msg

#!/usr/local/bin/fish

set -l new_commit_message_file "/tmp/gishtank_temporary_commit_message"
echo " " | tr -d " " > $new_commit_message_file

if test (count (cat $argv[1] | tail -n +2 | /usr/bin/grep "^[^#]")) -le 21 -a (count (cat $argv[1])) -lt 51
  if test (count (cat $argv[1] | tail -n +2 | /usr/bin/grep "^[^#]")) -gt 0
    echo "#" >> $new_commit_message_file
    echo "# Commit diff (Status at EOF)" >> $new_commit_message_file
    echo "#" >> $new_commit_message_file
    cat $argv[1] | tail -n +2 | /usr/bin/grep "^[^#]" >> $new_commit_message_file
    echo " " | tr -d " " >> $new_commit_message_file
  end
  /usr/bin/grep "^#" $argv[1] |tail -n +3 >> $new_commit_message_file
else
  /usr/bin/grep "^#" $argv[1] |tail -n +3 >> $new_commit_message_file
  if test (count (cat $argv[1] | tail -n +2 | /usr/bin/grep "^[^#]")) -gt 0
    echo " " | tr -d " " >> $new_commit_message_file
    echo "#" >> $new_commit_message_file
    echo "# Commit diff" >> $new_commit_message_file
    echo "#" >> $new_commit_message_file
    cat $argv[1] | tail -n +2 | /usr/bin/grep "^[^#]" >> $new_commit_message_file
  end
end

cat $new_commit_message_file > $argv[1]
rm -f $new_commit_message_file > /dev/null ^/dev/null