fish-shell/share/completions/ssh.fish

#
# Load completions shared by ssh and scp.
#
__fish_complete_ssh ssh

#
# ssh specific completions
#
complete -x -c ssh -d "Remote" -a "(__fish_complete_user_at_hosts)"

# Disable as username completion is not very useful.
# complete -x -c ssh -d User -a "
# (__fish_print_users | string match -r -v '^_')@
# "

complete -c ssh -n 'test (__fish_number_of_cmd_args_wo_opts) -ge 2' -d "Command to run" -x -a '(__fish_complete_subcommand --fcs-skip=2)'

complete -c ssh -s a -d "Disables forwarding of the authentication agent"
complete -c ssh -s A -d "Enables forwarding of the authentication agent"


function __ssh_print_local_addresses_with_labels
    if command -sq ip
        command ip --oneline address | string replace -r '\d+:\s+(\S+)\s+\S+\s+(.+)/.*' '$2\t$1'
    else if command -sq ifconfig
        # This is for OSX/BSD/anything else that doesn't have `ip` installed.
        # Since ifconfig output is not guaranteed to be the same on these systems,
        # for now we will limit the completions to just the IP address.
        # TODO: check ifconfig output on each system and rework below to include label.
        ifconfig | awk '/^\tinet/ { print $2 } '
    end
end
complete -x -c ssh -s b -d "Local address to bind to" -a '(__ssh_print_local_addresses_with_labels)'

complete -x -c ssh -s e -d "Escape character" -a "\^ none"
complete -c ssh -s f -d "Go to background"
complete -c ssh -s g -d "Allow remote host to connect to local forwarded ports"
complete -c ssh -s I -d "Smartcard device"
complete -c ssh -s k -d "Disable forwarding of Kerberos tickets"
complete -c ssh -s l -x -a "(__fish_complete_users)" -d "User"
complete -c ssh -s m -d "MAC algorithm"
complete -c ssh -s n -d "Prevent reading from stdin"
complete -c ssh -s N -d "Do not execute remote command"
complete -c ssh -s p -x -d "Port"
complete -c ssh -s q -d "Quiet mode"
complete -c ssh -s s -d "Subsystem"
complete -c ssh -s t -d "Force pseudo-tty allocation"
complete -c ssh -s T -d "Disable pseudo-tty allocation"
complete -c ssh -s x -d "Disable X11 forwarding"
complete -c ssh -s X -d "Enable X11 forwarding"
complete -c ssh -s L -d "Locally forwarded ports"
complete -c ssh -s R -d "Remotely forwarded ports"
complete -c ssh -s D -d "Dynamic port forwarding"
complete -c ssh -s c -d "Encryption cipher" -xa "(ssh -Q cipher)"

# Also retrieve `user@host` entries from history
function __ssh_history_completions --argument limit
    if string match -q ""
        set limit 100
    end

    history --prefix ssh | string replace -rf '.* ([A-Za-z0-9._:-]+@[A-Za-z0-9._:-]+).*' '$1' | head -n $limit
end

complete -k -c ssh -a '(__ssh_history_completions 100)' -f -d "Remote"