mac-keyboard-meta.bash

#!/bin/bash

#
# When terminal has "use option key as meta" then opt-3 (hash or pound)
# is not accessible because readline maps it to digit-argument
#
#    bind -p | grep e3
# the see the mapping
#
# bind provides a way to remove a mapping `bind -r` but that just leaves us
# with the key doing nothing. So we have to explicitly map to the correct char,
# and that means we need to detect the layout.
#
# Because we can only detect the attatched keyboard we need to make some
# allowances for connections over ssh. If LC_KBD_LAYOUT environment variable is
# set already we don't detect again.  LC_* env vars are usually allowed through
# an ssh connection  (/etc/sshd_config) so when this shell is started via ssh
# we use the remote value
#
# this needs to be sourced in .bashrc at both ends of the ssh connection

#
# Set LC_KBD_LAYOUT if it has not already been set
#
if [[ -z ${LC_KBD_LAYOUT+x} ]] && which defaults > /dev/null ; then
    LC_KBD_LAYOUT=$( defaults read com.apple.HIToolbox.plist  AppleCurrentKeyboardLayoutInputSourceID )
    export LC_KBD_LAYOUT
fi

#
# Mapping for US kbd
#
if [[ "${LC_KBD_LAYOUT:-unknown}" = 'com.apple.keylayout.US' ]] ; then
    bind '"\e3":"£"'
fi
#
# mapping for british keyboard
#
if [[ "${LC_KBD_LAYOUT:-unknown}" = 'com.apple.keylayout.British' ]] ; then
    bind '"\e3":"#"'
fi