tools/git/graph.sh

   1 #!/bin/bash
   2 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 about="Given a grep expression, creates a graph of occurrences of that
   7 expression in the recent history of the tree.
   8
   9 Prerequisites: git and GNU R (apt-get install r-base).
  10 "
  11
  12 set -e
  13
  14 target="$1"
  15
  16 if [ -z $target ]; then
  17     echo "usage: $0 <grep-compatible expression>"
  18     echo
  19     echo "$about"
  20     exit 1
  21 fi
  22
  23 datafile=$(mktemp -t tmp.XXXXXXXXXX)
  24 trap "rm -f $datafile" EXIT
  25
  26 echo 'ago count' > $datafile
  27 for ago in {90..0}; do
  28     commit=$(git rev-list -1 --until="$ago days ago" origin/trunk)
  29     git checkout -q -f $commit
  30     count=$(git grep -E "$target" -- '*.cc' '*.h' '*.m' '*.mm' | wc -l)
  31     echo "-$ago $count" >> $datafile
  32     echo -n '.'
  33 done
  34
  35 R CMD BATCH <(cat <<EOF
  36 data = read.delim("$datafile", sep=' ')
  37 png(width=600, height=300)
  38 plot(count ~ ago, type="l", main="$target", xlab='days ago', data=data)
  39 EOF
  40 ) /dev/null
  41
  42 echo done.  # Primarily to add a newline after all the dots.