I really can never remember if the project I'm in uses svn or cvs or if it's my own local svk mirror, etc. etc. Thus was born 'sup'!

Save and drop into a location that's in your PATH (I use ~/bin, YMMV)

#!/bin/bash
# sup -- a quick bash script to sync w/ various SCM tools
# @author   Jamie Wilkinson 

HERE=$(pwd)

## subversion
if [ -e ".svn" ]; then
        svn up
## cvs
elif [ -e "CVS" ]; then
        cvs up -dP
## darcs
elif [ -e "_darcs" ]; then
        darcs pull --all
## svk
elif [ -n "`grep $HERE ~/.svk/config`" ]; then
    svk up
## git
elif [ -e ".git" ]; then
    git pull
## perforce
#   todo
## arch
#   todo
## bzr
#   todo

fi

./thisscript.rb 10
will add up the patch stats for the last 10 commits
to the current darcs repo. this differs from the results
for a simple `diff -u --last` as this is the minimal patch
set whereas the script below stats the "edits patch"

#!/usr/bin/ruby
hashes=[]
changelist=`darcs changes --last #{ARGV.first} --xml`
changelist.each_line {
   |line|
   next unless line =~ /hash='(.*?).gz'/
   hashes << $1
}
added, removed = 0, 0
hashes.each {
   |hash|
   diff=`darcs annotate --match "hash #{hash}"`
   diff.each_line {
      |l|
      added   += 1 if l =~ /^[-]/
      removed += 1 if l =~ /^[+]/
   }
}
puts "+#{added} -#{removed}"