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#
# An almost ksh-compatible `autoload'. A function declared as `autoload' will
# be read in from a file the same name as the function found by searching the
# $FPATH (which works the same as $PATH), then that definition will be run.
#
# To do this without source support, we define a dummy function that, when
# executed, will load the file (thereby re-defining the function), then
# execute that newly-redefined function with the original arguments.
#
# It's not identical to ksh because ksh apparently does lazy evaluation
# and looks for the file to load from only when the function is referenced.
# This one requires that the file exist when the function is declared as
# `autoload'.
#
# usage: autoload [-pu] [func ...]
#
# options:
# -p print in a format that can be reused as input
# -u unset each function and remove it from the autoload list
#
# The first cut of this was by Bill Trost, trost@reed.edu
#
# Chet Ramey
# chet@ins.CWRU.Edu
unset _AUTOLOADS
_aindex=0
#
# Declare a function ($1) to be autoloaded from a file ($2) when it is first
# called. This defines a `temporary' function that will `.' the file
# containg the real function definition, then execute that new definition with
# the arguments given to this `fake' function. The autoload function defined
# by the file and the file itself *must* be named identically.
#
_aload()
{
eval $1 '() { . '$2' ; '$1' "$@" ; return $? ; }'
_autoload_addlist "$1"
}
_autoload_addlist()
{
local i=0
while (( i < $_aindex )); do
case "${_AUTOLOADS[i]}" in
"$1") return 1 ;;
esac
(( i += 1 ))
done
_AUTOLOADS[_aindex]="$1"
(( _aindex += 1 ))
return 0
}
_autoload_dump()
{
local func
for func in ${_AUTOLOADS[@]}; do
[ -n "$1" ] && echo -n "autoload "
echo "$func"
done
}
# Remove $1 from the list of autoloaded functions
_autoload_remove_one()
{
local i=0 nnl=0
local -a nlist
while (( i < _aindex )); do
case "${_AUTOLOADS[i]}" in
"$1") ;;
*) nlist[nnl]="${_AUTOLOADS[i]}" ; (( nnl += 1 ));;
esac
(( i += 1 ))
done
unset _AUTOLOADS _aindex
eval _AUTOLOADS=( ${nlist[@]} )
_aindex=$nnl
}
# Remove all function arguments from the list of autoloaded functions
_autoload_remove()
{
local func i es=0
# first unset the autoloaded functions
for func; do
i=0
while (( i < _aindex )); do
case "${_AUTOLOADS[i]}" in
"$func") unset -f $func ; break ;;
esac
(( i += 1 ))
done
if (( i == _aindex )); then
echo "autoload: $func: not an autoloaded function" >&2
es=1
fi
done
# then rebuild the list of autoloaded functions
for func ; do
_autoload_remove_one "$func"
done
return $es
}
#
# Search $FPATH for a file the same name as the function given as $1, and
# autoload the function from that file. There is no default $FPATH.
#
autoload()
{
local -a fp
local _autoload_unset nfp i
if (( $# == 0 )) ; then
_autoload_dump
return 0
fi
OPTIND=1
while getopts pu opt
do
case "$opt" in
p) _autoload_dump printable; return 0;;
u) _autoload_unset=y ;;
*) echo "autoload: usage: autoload [-pu] [function ...]" >&2
return 1 ;;
esac
done
shift $(( $OPTIND - 1 ))
if [ -n "$_autoload_unset" ]; then
_autoload_remove "$@"
return $?
fi
#
# If there is no $FPATH, there is no work to be done
#
if [ -z "$FPATH" ] ; then
echo "autoload: FPATH not set or null" >&2
return 1
fi
#
# This treats FPATH exactly like PATH: a null field anywhere in the
# FPATH is treated the same as the current directory.
#
# This turns $FPATH into an array, substituting `.' for `'
#
eval fp=( $(
IFS=':'
set -- ${FPATH}
for p in "$@" ; do echo -n "${p:-.} "; done
)
)
nfp=${#fp[@]}
for FUNC ; do
i=0;
while (( i < nfp )) ; do
if [ -f ${fp[i]}/$FUNC ] ; then
break # found it!
fi
(( i += 1 ))
done
if (( i == nfp )) ; then
echo "autoload: $FUNC: autoload function not found" >&2
es=1
continue
fi
# echo auto-loading $FUNC from ${fp[i]}/$FUNC
_aload $FUNC ${fp[i]}/$FUNC
es=0
done
return $es
}
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