git-fix-authors

#!/bin/sh

# Warning: this script is dangerous
# all commit IDs will change when you do this
# other people working on branches, forks, or copies
# of the repository will have significant difficult 
# merging/pushing their work

export AUTHORS_FILE=`pwd`/authors.txt

if [ ! -e "${AUTHORS_FILE}" ];
then
  echo "can't find ${AUTHORS_FILE}, aborting"
  exit 1
fi
 
git filter-branch --env-filter '
 
an="$GIT_AUTHOR_NAME"
am="$GIT_AUTHOR_EMAIL"
cn="$GIT_COMMITTER_NAME"
cm="$GIT_COMMITTER_EMAIL"
 
ENTRY=`cat "${AUTHORS_FILE}" | grep "^${an} = "`

if [ ! -z "${ENTRY}" ];
then
  full_info=`echo "${ENTRY}" | cut -f2 -d'=' | cut -b2-`
  an="`echo "${full_info}" | sed -e "s/ <.*\$//\"`"
  am="`echo "${full_info}" | sed -e "s/^.*</</\"`"
  cn="$an"
  cm="$am"
fi
 
export GIT_AUTHOR_NAME="$an"
export GIT_AUTHOR_EMAIL="$am"
export GIT_COMMITTER_NAME="$cn"
export GIT_COMMITTER_EMAIL="$cm"
'