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# Add a colon prompt to ed when a command is expected rather than text; makes
# it feel a lot more like using ex. Only do this when stdin is a terminal,
# however. Also try and use -v for more verbose error output, and rlwrap(1) if
# it's available.
ed() {
# We're only adding options if input is from a terminal
if [ -t 0 ] ; then
# Colon prompt (POSIX)
set -- -p : "$@"
# Verbose if available (not POSIX)
if ed -sv - </dev/null >&0 2>&0 ; then
set -- -v "$@"
fi
fi
# Execute the ed(1) call, in a wrapper if appropriate and with the
# concluded options
if [ -t 0 ] && command -v rlwrap >/dev/null 2>&1 ; then
command rlwrap ed "$@"
else
command ed "$@"
fi
}
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