more accurate treatment of context;
declare generated bounds for the sake of recdef, which has variables leaking from local context;
#!/usr/bin/env bash
#
# Author: Florian Haftmann, TU Muenchen
#
# DESCRIPTION: mercurial churn statistics for specified aliases file
ALIAS="${1:-$ISABELLE_HOME/Admin/user-aliases}"
shift
cd "$(dirname "$ALIAS")"
export LANG=C
export HGPLAIN=
"${HG:-hg}" churn --aliases "$ALIAS" "$@"