set -g default-terminal "tmux-256color"
set -g mouse on
set -g mode-keys vi
set -g extended-keys always

if -F "#{>=:#{version},3.3}" {
	set -g prompt-history-limit 999999
}
set -g history-file "$XDG_DATA_HOME/tmux/tmux_history"
run-shell 'mkdir -p "${XDG_DATA_HOME:-$HOME/.local/share}/tmux"'

# Better clipboard on mousedrag (https://unix.stackexchange.com/a/349020)
# Disable xterm escape sequences for setting clipboard
set -s set-clipboard off

set -g copy-command 'xclip -selection clipboard'

# https://github.com/neovim/neovim/wiki/FAQ#cursor-shape-doesnt-change-in-tmux
set -ga terminal-overrides '*:Ss=\E[%p1%d q:Se=\E[ q'

# Set C-a as new prefix
unbind C-b
set -g prefix C-a
bind C-a send-prefix

# Copy selection into primary selection (without aborting)
bind -T copy-mode-vi MouseDragEnd1Pane {
	send -X copy-pipe-no-clear "xclip -selection primary"
}

# Select word or line on double or triple click respectively (w/o aborting).
# (These are the defaults  w/o the `run -d 0.3; send -X copy-pipe-and-cancel`)

# use 'SecondClick' event instead of 'DoubleClick' for a quicker response. The
# third click would just extend the selection further so the eager execution
# does not hurt.
unbind -T copy-mode-vi DoubleClick1Pane
bind -T copy-mode-vi SecondClick1Pane {
	select-pane -t=
	send -X select-word
	send -X pipe-no-clear "xclip -selection primary"
}

bind -T copy-mode-vi TripleClick1Pane {
	select-pane -t=
	send -X select-line
	send -X pipe-no-clear "xclip -selection primary"
}

# use 'SecondClick' event instead of 'DoubleClick' (see above).
unbind -n DoubleClick1Pane
bind -n SecondClick1Pane {
	select-pane -t=
	if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" {
		send -M
	} {
		copy-mode
		send -X select-word
		send -X pipe-no-clear "xclip -selection primary"
	}
}

bind -n TripleClick1Pane {
	select-pane -t=
	if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" {
		send -M
	} {
		copy-mode
		send -X select-line
		send -X pipe-no-clear "xclip -selection primary"
	}
}

# Paste primary selection with middle mouse button
bind -n MouseDown2Pane {
	select-pane -t=
	if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" {
		send -M
	} {
		run 'tmux set-buffer -b XA_PRIMARY "$(xclip -selection p -o)"'
		paste-buffer -p -b XA_PRIMARY
	}
}
# When in copy-mode do the same but leave copy-mode first
bind -T copy-mode-vi MouseDown2Pane {
	select-pane -t=
	send -X cancel
	# TODO: Forward click to 'root' key-table to prevent code duplication
	run 'tmux set-buffer -b XA_PRIMARY "$(xclip -selection p -o)"'
	paste-buffer -p -b XA_PRIMARY
}

# Scroll up 5 lines when entering copy-mode through the mouse wheel, send 5x`up`
# when the current pane is in alternate mode and discard the `-e` flag passed to
# copy-mode from the default binding (See below)
bind -n WheelUpPane {
	if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" {
		send -M
	} {
		if -F "#{alternate_on}" {
			send -N5 up
		} {
			copy-mode
			send -N5 C-y
		}
	}
}
# Scroll without selecting the pane
bind -T copy-mode-vi WheelUpPane send -N5 C-y
# Exit copy-mode when at the bottom. This practically mimics `copy-mode -e` but
# only scrolling with the wheel (`-e` annoys me when scrolling down with `C-d`).
bind -T copy-mode-vi WheelDownPane {
	if -F "#{==:0,#{scroll_position}}" {
		send -X cancel
	} {
		send -N5 C-e
	}
}

# Make mouse wheel scroll down properly in alternate mode
bind -n WheelDownPane {
	send -M
	if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" {
		send -M
	} {
		if -F "#{alternate_on}" {
			send -N5 down
		} {
			# we're already at the bottom of the history, so nothing
			# needs to be done here
		}
	}
}

# Split panes with > and <
unbind %
bind < splitw -v -c "#{pane_current_path}"
unbind '"'
bind > splitw -h -c "#{pane_current_path}"

# tmux stopped supporting format string for -t, thus run-shell is
bind -N "Create a new window behind the current one with the same CWD" \
	c run-shell \
		"tmux neww -at #{active_window_index} -c \"#{pane_current_path}\""

bind -N "Break off the current pane to a new window behind the current one" \
	! run-shell "tmux breakp -at #{active_window_index}"

bind -N "Source the config file" \
	R \
		source-file "$XDG_CONFIG_HOME/tmux/tmux.conf" \; \
		display "Sourced $XDG_CONFIG_HOME/tmux/tmux.conf"

# Fullscreen pane (toggle)
bind F resizep -Z

# Automatically renumber windows when closing one
set -g renumber-windows on
# Number windows and panes with 1-based indices
set -g base-index 1
set -g pane-base-index 1

# Enter copy-mode and scroll one page up directly with PageUp without the need
# of the prefix. (Exists already per default with prefix)
bind -n PgUp copy-mode -u

# Repeatable window-navigation bindings
bind -r   n next
bind -r C-n next
bind -r   p prev
bind -r C-p prev

# Change windows with Alt-Page{Up,Down} analog to Ctrl-Page{Up,Down} in vim
bind -n M-PgUp prev
bind -n M-PgDn next

# Jump back to last focused window
bind C-o last-window

# Swap window with previous/next one
bind -r N swap-window -d -t :+1
bind -r P swap-window -d -t :-1

# Reorder windows by dragging them in the status line.
# NOTE: Omitting the source from 3.4 on (after 8636848e6348) will do nothing, as
#       the source is then implied to be the window that the mouse is currently
#       on (i.e. also the target)
# TODO: comment on tmux issue #656
if -F "#{>=:#{version},3.4}" {
	# TODO: why does this not work <3.4?
	bind -n MouseDrag1Status swap-window -d -s"" -t=
} {
	bind -n MouseDrag1Status swap-window -d -t=
	# TODO: why does this not work >=3.4?
	# bind -n MouseDrag1Status swap-window -d -s":" -t=
}

# Move a window to the first or very last position
# TODO: do nothing on drags that don't start on a window name
# NOTE: mouse_{x,y} were not set in status line before 3.3
if -F "#{>=:#{version},3.3}" {
	bind -n MouseDragEnd1StatusDefault {
		if -F "#{e|<|f|0:#{mouse_x},#{e|/|f:#{window_width},2}}" {
			move-window -bt :^
		} {
			move-window -at :$
		}
	}
}

# Repeatable pane swapping bindings
bind -r \{ swap-pane -U
bind -r \} swap-pane -D

# Select last window if target is current
bind 1 select-window -T -t 1
bind 2 select-window -T -t 2
bind 3 select-window -T -t 3
bind 4 select-window -T -t 4
bind 5 select-window -T -t 5
bind 6 select-window -T -t 6
bind 7 select-window -T -t 7
bind 8 select-window -T -t 8
bind 9 select-window -T -t 9
# Since base-index == 1, 0 should go to window 10
bind 0 select-window -T -t 10

# Select windows with Alt-[0-9], select last window if target is current
bind -n M-1 select-window -T -t 1
bind -n M-2 select-window -T -t 2
bind -n M-3 select-window -T -t 3
bind -n M-4 select-window -T -t 4
bind -n M-5 select-window -T -t 5
bind -n M-6 select-window -T -t 6
bind -n M-7 select-window -T -t 7
bind -n M-8 select-window -T -t 8
bind -n M-9 select-window -T -t 9
bind -n M-0 select-window -T -t 10

# Vim-bindings

# Enter copy-mode with Escape
# bind Escape copy-mode

# Start selection (i.e. visual mode) with `v`, and rectangle selection (i.e.
# visual block mode) with `C-v`
# TODO: mimic vims behaviour for visual mode cycling and toggling
unbind -T copy-mode-vi v
bind -T copy-mode-vi v send -X begin-selection
unbind -T copy-mode-vi C-v
bind -T copy-mode-vi C-v {
	if -F "#{selection_active}" {} { send -X begin-selection }
	send -X rectangle-toggle
}

# Yank into system clipboard with vim-like bindings
bind -T copy-mode-vi y run-shell '${XDG_CONFIG_HOME:-$HOME/.config}/tmux/yank.sh'
bind -T copy-mode-vi Y {
	if -F "#{selection_present}" {
		send -X copy-pipe-line
	} {
		send -X copy-pipe-end-of-line
	}
}

# Clear selection or cancel copy-mode when nothing is selected
bind -T copy-mode-vi Escape {
	if -F "#{selection_present}" {
		send -X clear-selection
	} {
		send -X cancel
	}
}

# Use insert-mode-like bindings to cancel copy-mode
bind -T copy-mode-vi A send -X cancel
bind -T copy-mode-vi I send -X cancel
bind -T copy-mode-vi a send -X cancel

# Rudimentary text object simulation
bind -T copy-mode-vi i run-shell '${XDG_CONFIG_HOME:-$HOME/.config}/tmux/textobjs.sh'

# Simulate vim's C-e & C-y (Keep cursor position while scrolling). As tmux
# cannot scroll past the first and last history line, both bindings stop
# scrolling when the respective line is visible. This mimics the behaviour of
# vim's C-y at the top of the file.
bind -T copy-mode-vi C-e {
	# check that there is still history beneath to scroll to.
	if -F "#{e|>:#{scroll_position},0}" {
		send-keys -X scroll-down
		# check that the cursor is not at the top of the pane
		if -F "#{e|>:#{copy_cursor_y},#{scroll_region_upper}}" {
			send-keys -X cursor-up
		}
	}
}

bind -T copy-mode-vi C-y {
	# check that there is still history above to scroll to.
	if -F "#{e|<:#{scroll_position},#{history_size}}" {
		send-keys -X scroll-up
		# check that the cursor is not at the bottom of the pane
		if -F "#{e|<:#{copy_cursor_y},#{scroll_region_lower}}" {
			send-keys -X cursor-down
		}
	}
}

# Scroll so that the current line becomes the middle one (vim's zz)
if -F "#{<:#{version},3.4}" {
	# Simulate when scroll-middle does not exist yet
	# TODO: do the scroll_position and cursor_y calculations only once here
	bind -T copy-mode-vi z {
		set -F @middle_line "#{e|/:#{e|-:#{pane_height},1},2}"
		set -F @scroll_to_middle "#{e|-:#{copy_cursor_y},#{@middle_line}}"
		if -F "#{e|<:#{@scroll_to_middle},0}" {
			run "tmux send -N #{e|*:-1,#{@scroll_to_middle}} C-y"
		} { if -F "#{e|>:#{@scroll_to_middle},0}" {
			run "tmux send -N #{@scroll_to_middle} C-e"
		} }
	}
} {
	# should be the default, but here for verboseness
	bind -T copy-mode-vi z send -X scroll-middle
}

# Navigate panes with <prefix>-[hjkl]
# NOTE: C-[hjkl] (w/o prefix) moves through vim splits and tmux panes
#       See vim-tmux-navigator
unbind l
bind h selectp -L
bind j selectp -D
bind k selectp -U
bind l selectp -R
unbind -T prefix Left
unbind -T prefix Up
unbind -T prefix Down
unbind -T prefix Right

# Resize mode similar to my i3 config
bind -T resize h resizep -L \; switchc -T resize
bind -T resize j resizep -D \; switchc -T resize
bind -T resize k resizep -U \; switchc -T resize
bind -T resize l resizep -R \; switchc -T resize
bind -T resize 1 selectl even-horizontal \; switchc -T resize
bind -T resize 2 selectl even-vertical   \; switchc -T resize
bind -T resize 3 selectl main-horizontal \; switchc -T resize
bind -T resize 4 selectl main-vertical   \; switchc -T resize
bind -T resize 5 selectl tiled           \; switchc -T resize
bind r switchc -T resize

# Make it possible to send keys that are bound in the root key table. (C-h for
# example is sometimes needed as backspace sequence)
# TODO: Make repeatable without C-v
bind -r C-v command-prompt -k -p (selfinsert) { send "%%" }

# Synchronize the panes in the current window with `<prefix>S`
bind S set -w synchronize-panes

# Require confirmation before killing a pane
set -g remain-on-exit on
if -F "#{>=:#{version},3.3}" {
	bind -n C-d if -F "#{pane_dead}" { kill-pane } { send }
	bind -n Enter if -F "#{pane_dead}" { respawn-pane } { send }
} {
	# omitting the key argument was introduced in 3.3
	bind -n C-d if -F "#{pane_dead}" { kill-pane } { send C-d }
	bind -n Enter if -F "#{pane_dead}" { respawn-pane } { send Enter }
}

# Change installation location of plugins
setenv -g TMUX_PLUGIN_MANAGER_PATH "$XDG_CONFIG_HOME/tmux/plugins/"

## Plugins
set -g @plugin 'tmux-plugins/tmux-continuum'
set -g @plugin 'tmux-plugins/tmux-prefix-highlight'
set -g @plugin 'tmux-plugins/tmux-resurrect'
set -g @plugin 'tmux-plugins/tmux-sensible'
set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'vim-tmux-navigator'

# Capture pane content
set -g @resurrect-capture-pane-contents 'on'
# Change keybindings
set -g @resurrect-save 'C-s'
set -g @resurrect-restore 'C-r'
# Save session every 5 min
set -g @continuum-save-interval '5'
# Last saved environment is automatically restored when tmux is started.
set -g @continuum-restore 'on'
# Restore {,neo}vim sessions with the help of vim-obsession
# https://github.com/tpope/vim-obsession
set -g @resurrect-strategy-vim 'session'
set -g @resurrect-strategy-nvim 'session'
# Save sessions before detaching
unbind d
bind d {
	run -b "$XDG_CONFIG_HOME/tmux/plugins/tmux-resurrect/scripts/save.sh"
	detach
}

## Theming
set -g @accent_color '#fce94f' # brightyellow
set -g @ui_color '#757773' # brightblack
set -g @sync_color '#ef2929' # brightred
set -g @text_fg '#5e6466' # black

set -g status-style bg=default,fg='#d3d7cf' # white
set -g message-command-style 'bg=default,fg=#{@accent_color}'
set -g message-style 'bg=#{@accent_color},fg=#{@text_fg}'
set -g mode-style 'bg=#{@accent_color},fg=#{@text_fg}'

# Visually display when a pane is in copy-mode or 'synchronize-panes' is on.
# Use the pane-borders for tmux >= 3.2 and the "prefix_highlight" plugin
# otherwise.
#
# NOTE: `<` does string comparison with `strcmp()`. This means that the
#       condition will break from a double digit major version (e.g. `10.0`) on.
# TODO: Use #{e|<|f:, but cut off trailing non-numbers and convert the result
#       (i.e. 1.00 or 0.00) back into an int.
if -F "#{<:#{version},3.2}" {
	set -g pane-border-style 'bg=default,fg=#{@ui_color}'
	set -g pane-active-border-style 'bg=default,fg=#{@accent_color}'

	set -g @prefix_highlight_show_copy_mode 'on'
	set -g @prefix_highlight_show_sync_mode 'on'
	set -g @prefix_highlight_copy_mode_attr 'fg=#{@text_fg},bg=#{@accent_color}'
	set -g @prefix_highlight_sync_mode_attr 'fg=#{@text_fg},bg=#{@sync_color}'
} {
	# From 3.2 on, we can use formats in styles, so that all indicators can be
	# done by the borders.
	set -g pane-border-style "#{?synchronize-panes,fg=#{@sync_color},fg=#{@ui_color}}"
	set -g pane-active-border-style "#{?pane_in_mode,bg=#{@accent_color}#,fg=#{@ui_color},#{?synchronize-panes,fg=#{@sync_color},fg=#{@accent_color}}}"
}

set -g @prefix_highlight_fg '#{@accent_color}'
set -g @prefix_highlight_bg 'default'
set -g status-right "#{prefix_highlight}"
set -g status-left "#{prefix_highlight}"

set -g status-justify centre

# Display window_index and window_name as status and highlight it when the
# active pane is zoomed.
set -g window-status-current-format \
	"#{?window_zoomed_flag,#[fg=#{@text_fg} bg=#{@accent_color} underscore],#[fg=#{@accent_color} bold]}#I #W"
set -g window-status-format \
	"#[fg=#{@ui_color}]#{?window_zoomed_flag,#[underscore],}#I #W"

# Initialize TMUX plugin manager. Keep this line at the very bottom.
run -b "$XDG_CONFIG_HOME/tmux/plugins/tpm/tpm"