function __fish_tmux_sessions -d 'available sessions'
    tmux list-sessions -F "#S	#{session_windows} windows created: #{session_created_string} [#{session_width}x#{session_height}]#{session_attached}" | sed 's/0$//;s/1$/ (attached)/' 2>/dev/null
end

function __fish_tmux_clients -d 'connected clients'
    tmux list-clients -F "#{client_tty}	#S: Created: #{client_created_string} [#{client_width}x#{client_height} #{client_termname}]" 2>/dev/null
end

function __fish_tmux_panes -d 'window panes'
    #fully qualified pane names
    tmux list-panes -F '#S:#W.#P	session:window.pane' 2>/dev/null

    #panes by themselves
    tmux list-panes -F '#P	pane' 2>/dev/null

    #windows by themselves
    tmux list-panes -F '#W	window' 2>/dev/null
end

#don't allow dirs in the completion list...
complete -c tmux -x

###############  Begin: Front  Flags ###############
#these do not require parameters
complete -c tmux -n __fish_use_subcommand -s 2 -d 'Force tmux to assume the terminal supports 256 colours'
complete -c tmux -n __fish_use_subcommand -s 8 -d 'Like -2, but indicates that the terminal supports 88 colours'
complete -c tmux -n __fish_use_subcommand -s l -d 'Behave as a login shell'
complete -c tmux -n __fish_use_subcommand -s q -d 'Set the quiet server option'
complete -c tmux -n __fish_use_subcommand -s u -d 'Flag explicitly informs tmux that UTF-8 is supported'
complete -c tmux -n __fish_use_subcommand -s v -d 'Request verbose logging'
complete -c tmux -n __fish_use_subcommand -s V -d 'Report the tmux version'

#these require parameters
complete -c tmux -n __fish_use_subcommand -xs c -d 'Execute command using the default shell'
complete -c tmux -n __fish_use_subcommand -rs f -d 'Alternate config file'
complete -c tmux -n __fish_use_subcommand -rs L -d 'Specify the name of the server socket to use'
complete -c tmux -n __fish_use_subcommand -rs S -d 'Full path to server socket. If set, -L is ignored.'
###############  End:   Front  Flags ###############

###############  Begin: Clients and Sessions ###############
set -l attach 'attach-session attach at a'
set -l detach 'detach-client detach'
set -l has 'has-session has'
set -l killserver kill-server
set -l killsession kill-session
set -l lsc 'list-clients lsc'
set -l lscm 'list-commands lscm'
set -l ls 'list-sessions ls'
set -l lockc 'lock-client lockc'
set -l locks 'lock-session locks'
set -l new 'new-session new'
set -l refresh 'refresh-client refresh'
set -l rename 'rename-session rename'
set -l showmsgs 'show-messages showmsgs'
set -l source 'source-file source'
set -l start 'start-server start'
set -l suspendc 'suspend-client suspendc'
set -l switchc 'switch-client switchc'

complete -c tmux -n __fish_use_subcommand -a $attach -d 'attach to existing session'
complete -c tmux -n "__fish_seen_subcommand_from $attach" -s d -d 'detach other clients'
complete -c tmux -n "__fish_seen_subcommand_from $attach" -s r -d 'attach in read-only mode'

complete -c tmux -n __fish_use_subcommand -a $detach -d 'detach current client'
complete -c tmux -n "__fish_seen_subcommand_from $detach" -s P -d 'SIGHUP parent process of client, likely causing it to exit'

complete -c tmux -n __fish_use_subcommand -a $has -d 'report error and exit with 1 if the session does not exist'
complete -c tmux -n __fish_use_subcommand -a $killserver -d 'kill tmux server, clients, and sessions'
complete -c tmux -n __fish_use_subcommand -a $killsession -d 'destroy session, close its windows, and detach all its clients'
complete -c tmux -n __fish_use_subcommand -a $lsc -d 'list all attached clients'
complete -c tmux -n __fish_use_subcommand -a $lscm -d 'list syntax for all tmux commands'
complete -c tmux -n __fish_use_subcommand -a $ls -d 'list all sessions'
complete -c tmux -n __fish_use_subcommand -a $lockc -d 'lock client'
complete -c tmux -n __fish_use_subcommand -a $locks -d 'lock session'

complete -c tmux -n __fish_use_subcommand -a $new -d 'create a new session with name session-name'
complete -c tmux -n "__fish_seen_subcommand_from $new" -s d -d "don't attach to current window"
complete -c tmux -n "__fish_seen_subcommand_from $new" -s A -d "attach to existing session if session-name already exists"
complete -c tmux -n "__fish_seen_subcommand_from $new" -s D -d "if -A is specified, detach other clients attached to the session"
complete -c tmux -n "__fish_seen_subcommand_from $new" -s P -d "print information about the new session after creation"
complete -c tmux -n "__fish_seen_subcommand_from $new" -s E -d "don't apply update-environment option"
complete -c tmux -n "__fish_seen_subcommand_from $new" -xs c -d start-directory
complete -c tmux -n "__fish_seen_subcommand_from $new" -xs F -d format
complete -c tmux -n "__fish_seen_subcommand_from $new" -xs n -d window-name
complete -c tmux -n "__fish_seen_subcommand_from $new" -xs s -d session-name
complete -c tmux -n "__fish_seen_subcommand_from $new" -xs t -d group-name
complete -c tmux -n "__fish_seen_subcommand_from $new" -xs x -d width
complete -c tmux -n "__fish_seen_subcommand_from $new" -xs y -d height

complete -c tmux -n __fish_use_subcommand -a $refresh -d 'refresh client'
complete -c tmux -n "__fish_seen_subcommand_from $refresh" -s S -d 'update client status bar'

complete -c tmux -n __fish_use_subcommand -a $rename -d 'rename session'
complete -c tmux -n __fish_use_subcommand -a $showmsgs -d 'save msgs in status bar in per-client msg log'

complete -c tmux -n __fish_use_subcommand -a $source -d 'execute commands from path'
complete -c tmux -n __fish_use_subcommand -a $start -d 'start tmux server if not running; do not create a session'

complete -c tmux -n __fish_use_subcommand -a $suspendc -d 'send SIGTSTP signal to client (tty stop)'

complete -c tmux -n __fish_use_subcommand -a $switchc -d 'Switch the current session for client target-client to target-session'
complete -c tmux -n "__fish_seen_subcommand_from $switchc" -s l -d 'move client to the last session'
complete -c tmux -n "__fish_seen_subcommand_from $switchc" -s n -d 'move client to the next session'
complete -c tmux -n "__fish_seen_subcommand_from $switchc" -s p -d 'move client to the previous session'
complete -c tmux -n "__fish_seen_subcommand_from $switchc" -s r -d 'toggle if client is read-only'

#commands with a session flag
complete -c tmux -xs t -n "__fish_seen_subcommand_from $attach $new $has $killsession $lsc $locks $rename $switchc" -a '(__fish_tmux_sessions)' -d target-session
complete -c tmux -xs s -n "__fish_seen_subcommand_from $detach" -a '(__fish_tmux_sessions)' -d target-session

#commands with a client flag
complete -c tmux -xs t -n "__fish_seen_subcommand_from $detach $lockc $refresh $showmsgs $suspendc" -a '(__fish_tmux_clients)' -d target-client
complete -c tmux -xs c -n "__fish_seen_subcommand_from $switchc" -a '(__fish_tmux_clients)' -d target-client

#commands with the -F format flag
complete -c tmux -n "__fish_seen_subcommand_from $lsc $ls" -rs F -d 'format string'

###############  End: Clients and Sessions ###############

###############  Begin: Windows and Panes ###############
#TODO - these commands are not currently implemented.
#there is a section in the tmux man page that has the same title as this section
#use the "Clients and Sessions" code as an example when implementing this
###############  End:   Windows and Panes ###############

###############  Begin: Key Bindings ###############
set -l bind 'bind-key bind'
set -l lsk 'list-keys lsk'
set -l send 'send-keys send'
set -l sendprefix send-prefix
set -l unbind 'unbind-key unbind'

set -l key_table 'vi-edit emacs-edit vi-choice emacs-choice vi-copy emacs-copy'

complete -c tmux -n __fish_use_subcommand -a $bind -d 'bind key to command'
complete -c tmux -n "__fish_seen_subcommand_from $bind" -s c -d 'bind for command mode instead of normal mode'
complete -c tmux -n "__fish_seen_subcommand_from $bind" -s n -d 'make the binding work without using a prefix key'
complete -c tmux -n "__fish_seen_subcommand_from $bind" -s r -d 'key may repeat'
complete -c tmux -n "__fish_seen_subcommand_from $bind" -xs t -d 'choose key table for binding' -xa "$key_table"

complete -c tmux -n __fish_use_subcommand -a $lsk -d 'list all key bindings'
complete -c tmux -n "__fish_seen_subcommand_from $lsk" -s t -d 'key table' -xa "$key_table"

complete -c tmux -n __fish_use_subcommand -a $send -d 'list all key bindings'
complete -c tmux -n "__fish_seen_subcommand_from $send" -s R -d 'reset terminal state'
complete -c tmux -n "__fish_seen_subcommand_from $send" -xs t -a '(__fish_tmux_panes)' -d 'target pane'

complete -c tmux -n __fish_use_subcommand -a $sendprefix -d 'send the prefix key'
complete -c tmux -n "__fish_seen_subcommand_from $sendprefix" -s 2 -d 'use secondary prefix'
complete -c tmux -n "__fish_seen_subcommand_from $sendprefix" -xs t -a '(__fish_tmux_panes)' -d 'target pane'

complete -c tmux -n __fish_use_subcommand -a $unbind -d 'unbind the command bound to key'
complete -c tmux -n "__fish_seen_subcommand_from $unbind" -s a -d 'remove all key bindings'
complete -c tmux -n "__fish_seen_subcommand_from $unbind" -s c -d 'binding for command mode'
complete -c tmux -n "__fish_seen_subcommand_from $unbind" -s n -d 'command bound to key without a prefix (if any) removed'
complete -c tmux -n "__fish_seen_subcommand_from $unbind" -xs t -d 'key table' -xa "$key_table"

###############  End:   Key Bindings ###############

###############  Begin: Options ###############
#TODO - these commands are not currently implemented.
#there is a section in the tmux man page that has the same title as this section
#use the "Clients and Sessions" code as an example when implementing this
###############  End:   Options ###############

###############  Begin: Environment ###############
set -l setenv 'set-environment setenv'
set -l showenv 'show-environment showenv'

complete -c tmux -n __fish_use_subcommand -a $setenv -d 'Set or unset an environment variable'
complete -c tmux -n "__fish_seen_subcommand_from $setenv" -s g -d 'global environment'
complete -c tmux -n "__fish_seen_subcommand_from $setenv" -s r -d 'remove from environment before starting a new process'
complete -c tmux -n "__fish_seen_subcommand_from $setenv" -s u -d 'unset variable'
complete -c tmux -xs t -n "__fish_seen_subcommand_from $setenv" -a '(__fish_tmux_sessions)' -d target-session

complete -c tmux -n __fish_use_subcommand -a $showenv -d 'bind key to command'
complete -c tmux -n "__fish_seen_subcommand_from $showenv" -s g -d 'global environment'
complete -c tmux -xs t -n "__fish_seen_subcommand_from $showenv" -a '(__fish_tmux_sessions)' -d target-session

###############  End:   Environment ###############

###############  Begin: Status Line ###############
set -l commandprompt command-prompt
set -l display 'display-message display'

complete -c tmux -n __fish_use_subcommand -a $commandprompt -d 'Open the command prompt in a client'
complete -c tmux -n "__fish_seen_subcommand_from $commandprompt" -s I -x -d 'Comma-separated list of initial text for each prompt'
complete -c tmux -n "__fish_seen_subcommand_from $commandprompt" -s p -x -d 'Comma-separated list of prompts'
complete -c tmux -n "__fish_seen_subcommand_from $commandprompt" -s t -xa '(__fish_tmux_clients)' -d target-client

complete -c tmux -n __fish_use_subcommand -a $display -d 'Display a message'
complete -c tmux -n "__fish_seen_subcommand_from $display" -s p -d 'print to stdout'
complete -c tmux -n "__fish_seen_subcommand_from $display" -s t -xa '(__fish_tmux_panes)' -d target-pane
complete -c tmux -n "__fish_seen_subcommand_from $display" -s c -xa '(__fish_tmux_clients)' -d target-client

###############  End:   Status Line ###############

###############  Begin: Buffers ###############
#TODO - these commands are not currently implemented.
#there is a section in the tmux man page that has the same title as this section
#use the "Clients and Sessions" code as an example when implementing this
###############  End:   Buffers ###############

###############  Begin: Miscellaneous ###############
#TODO - these commands are not currently implemented.
#there is a section in the tmux man page that has the same title as this section
#use the "Clients and Sessions" code as an example when implementing this
###############  End:   Miscellaneous ###############
