git-blame-revs

git-blame-revs

#!/bin/bash

# git-blame-revs
#
# Generate a list of revisions that a file is currently composed of.
# Think of it as a high-level summary of a 'blame'.
#
# NOTE: It is currently hardcoded to work with SVN repos via git-svn.
#
# Author: justin@worksperfectly.net
#
#
# TODO
# ====
#
#  * Refactor SVN-specific features so they can be enabled via an 
#    additional command line argument (-s/--svn).


if [ $# -lt 1 ] ; then
  echo "Usage: "`basename "$0"` "FILE..." >&2
  exit 1
fi

# allow DEBUG env varialbe to trigger simple bash debugging when it is set to 
# anything but 'false'
if [ ${DEBUG:=false} != 'false' ] ; then
  set -x
fi

# create var for newline char since it's a pain to embed in strings.
NL=$'\n'

for file in "$@"; do
	# blame the file and then get the unique shas
	# 
	# the -w is due to windows line endings and core.autocrlf
	# http://stackoverflow.com/a/4653165/2284440
	shas=`git blame -w ${file} | awk '{ print $1 }' | sort | uniq`

	output=""
	for sha in $shas; do
		# get the revision info for each commit
		# output the unix timestamp for sorting purposes. we'll remove it later
		git_log=$(git --no-pager log -1 --pretty=format:"%ct %h [%ci] (%cn) %s%n" $sha)

		# get the associated SVN info
		git_svn=$(git svn find-rev $sha)

		# format it nicely
		svn_rev=$(printf "r%4s" "$git_svn")

		# assemble the line for output
		output="${output}$svn_rev / $git_log${NL}"
	done

	# remove trailing space for correct counting of lines
	output=$(echo "$output" | sed -E -e 's/\n$//')

	# count up the revs
	count=$(echo "$output" | wc -l | tr -d ' ')

	# TODO: add option to turn off count of revs
	echo "$file (${count})"

	# finally remove the unix timestamp. kind of messy. slash is part 
	# of the regexp to anchor us to ensure we get the timestamp and not
	# the SHA (as that could be all numbers).
	echo "${output}" | sort | sed -E -e 's/\/ [0-9]+ /\/ /'

	echo ""
done