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|
#!/usr/bin/env bash
init_variables() {
COMMAND=${0#*-}
CONFIG=false
ALL=false
unset OLD_EMAIL
unset CORRECT_EMAIL
unset CORRECT_NAME
TYPE='both'
}
usage() {
cat << EOF
usage: git ${COMMAND} [<options>]
Options
-a, --all rewrite all identities in commits and tags
-c, --use-config define correct values from user Git config
-e, --correct-email <email> define the correct email to set
-n, --correct-name <name> define the correct name to set
-o, --old-email <email> rewrite identities matching old email in commits and tags
-t, --type <id> define the type of identities affected by the rewrite
author, committer, both (default)
EOF
}
error() {
if [[ -n "$1" ]]; then
local msg=$( echo "error: $1" | sed 's/\\n/\\n /g' )
echo -e "${msg}" >&2
fi
usage
exit 1
}
reauthor() {
local author='
if ${ALL} || [ "${GIT_AUTHOR_EMAIL}" = "${OLD_EMAIL}" ]; then
[ -z "${CORRECT_EMAIL+x}" ] || export GIT_AUTHOR_EMAIL="${CORRECT_EMAIL}"
[ -z "${CORRECT_NAME+x}" ] || export GIT_AUTHOR_NAME="${CORRECT_NAME}"
fi
'
local committer='
if ${ALL} || [ "${GIT_COMMITTER_EMAIL}" = "${OLD_EMAIL}" ]; then
[ -z "${CORRECT_EMAIL+x}" ] || export GIT_COMMITTER_EMAIL="${CORRECT_EMAIL}"
[ -z "${CORRECT_NAME+x}" ] || export GIT_COMMITTER_NAME="${CORRECT_NAME}"
fi
'
local filter
case "${TYPE}" in
author) filter="${author}" ;;
committer) filter="${committer}" ;;
both) filter="${author} ${committer}" ;;
esac
export ALL
export OLD_EMAIL
export CORRECT_EMAIL
export CORRECT_NAME
git filter-branch --force --env-filter "${filter}" \
--tag-name-filter cat -- --branches --tags
}
parse_options() {
while [[ "$#" -gt 0 ]]; do
case "$1" in
--all|-a)
ALL=true
shift
;;
--correct-email|-e)
[[ -n "${2+x}" ]] || error 'Missing correct-email value'
CORRECT_EMAIL="$2"
shift 2
;;
-h)
usage
exit 0
;;
--correct-name|-n)
[[ -n "${2+x}" ]] || error 'Missing correct-name value'
CORRECT_NAME="$2"
shift 2
;;
--old-email|-o)
[[ -n "${2+x}" ]] || error 'Missing old-email value'
OLD_EMAIL="$2"
shift 2
;;
--type|-t)
[[ -n "${2+x}" ]] || error 'Missing type value'
TYPE="$2"
shift 2
;;
--use-config|-c)
CONFIG=true
shift
;;
*)
error "invalid option '$1'"
;;
esac
done
if ${CONFIG}; then
# use config values if not explicitly already defined
[[ -n "${CORRECT_EMAIL+x}" ]] || CORRECT_EMAIL=$( git config user.email )
[[ -n "${CORRECT_NAME+x}" ]] || CORRECT_NAME=$( git config user.name )
fi
}
validate_options() {
# Either OLD_EMAIL should be set or ALL should be true
if [[ -z "${OLD_EMAIL+x}" ]] && ! ${ALL}; then
msg="missing target of the rewrite"
msg="${msg}\nuse either --old-email option or --all flag"
error "${msg}"
fi
# OLD_EMAIL shouldn't be set if ALL is true as well to prevent misuse
if [[ -n "${OLD_EMAIL+x}" ]] && ${ALL}; then
msg="ambiguous target of the rewrite"
msg="${msg}\nuse either --old-email option or --all flag"
error "${msg}"
fi
# CORRECT_NAME should be either unset or set to non-empty string
[[ -n "${CORRECT_NAME-x}" ]] || error "empty name is not allowed"
# Either CORRECT_EMAIL or CORRECT_NAME should be set
if [[ -z "${CORRECT_EMAIL+x}" ]] && [[ -z "${CORRECT_NAME+x}" ]]; then
msg="missing correct email and/or name to set"
msg="${msg}\nuse --correct-email and/or --correct-name options"
msg="${msg}\nor --use-config flag with user values set in Git config"
error "${msg}"
fi
# TYPE should be a valid identifier
if [[ "${TYPE}" != 'both' ]] \
&& [[ "${TYPE}" != 'author' ]] \
&& [[ "${TYPE}" != 'committer' ]]; then
error "invalid type '${TYPE}'"
fi
}
init_variables
parse_options "$@"
validate_options
reauthor
|
