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# utility functions for all shells
# these should be POSIX-compatible.
# add a path to PATH, but only if it's not already there
path_add_to_PATH() { # path_add [-a] PATH...
# -a appends (default is prepend)
APPEND=false
if [ "x$1" = "x-a" ]; then
APPEND=true
shift
fi
for p; do
case ":$PATH:" in
*:"$p":*) ;;
*)
if $APPEND; then
PATH="$PATH:$p"
else
PATH="$p:$PATH"
fi
;;
esac
done
unset APPEND
}
# Generalization of `path_add_to_PATH' for any variable.
path_add_unsafe() { #path_add_unsafe [-a] [-d DELIM] VAR PATH...
## Add PATH... to VAR, delimiting with DELIM (default :).
# By default, the VAR will be prepended to; passing -a will append the
# variable. -d DELIM defines the delimiter.
#
# This function has the _unsafe suffix because it uses `eval' to set
# variables.
APPEND=false; DELIM=:
while getopts ad: opt; do
case "$opt" in
a) APPEND=true ;;
d) DELIM="$OPTARG" ;;
*) return 1 ;;
esac
done
shift $(expr $OPTIND - 1)
var="$1"; shift
for path; do
case ":$(eval "echo \$$var"):" in
*:"$path":*) ;;
*)
if $APPEND; then
eval "$var=\$$var${var:+$DELIM}$path"
else
eval "$var=$path${var:+$DELIM}\$$var"
fi
;;
esac
done
unset -v APPEND DELIM var
}
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