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

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'

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

# 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'

# 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)
# TODO: Do not modify selection when scolling with the wheel
bind -n WheelUpPane \
	if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" {
		send -M
	} {
		if -F "#{alternate_on}" {
			send -N5 up
		} {
			copy-mode; send -XN5 scroll-up
		}
	}
# Scroll without selecting the pane
bind -T copy-mode-vi WheelUpPane send -XN5 scroll-up
# 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 -XN5 scroll-down}

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

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

# Create new window with CWD as PWD and place it after the current one
bind c neww -a -c "#{pane_current_path}" -t #{active_window_index}

# Break off the current pane to a new window behind the current one
bind ! breakp -a -t #{active_window_index}

# Resource config
bind 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 with 1-based indices
set -g 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 PPage 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

# 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.
bind -n MouseDrag1Status swap-window -d -t=

# TODO: do nothing on drags that don't start on a window name
bind -n MouseDragEnd1StatusDefault \
	if -F "#{e|>|f|0:#{mouse_x},#{e|/|f:#{window_width},2}}" {
		run-shell "tmux move-window -at #{last_window_index}"
	} {
		move-window -t0
	}

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

# 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
# TODO: This breaks on repeatable movements (e.g. `y2e`)
bind -T copy-mode-vi y \
	if -F "#{selection_present}" {
		send -X copy-pipe
	} {
		command-prompt -k -p (operator-pending) {
			send -X begin-selection
			send "%%"
			send -X copy-pipe
		}
	}
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
# TODO: Breaks when on the beginning or end of the object
bind -T copy-mode-vi i \
	if -F "#{selection_present}" {
		command-prompt -k -p (operator-pending) {
			if -F "#{==:%1,w}" {
				# send "boe"
				send -X previous-word
				send -X other-end
				send -X next-word-end
			}{ if -F "#{==:%1,W}" {
				# send "BoE"
				send -X previous-space
				send -X other-end
				send -X next-space-end
			}{ if -F "#{==:%1,p}" {
				# send "{j0o}k$"
				send -X previous-paragraph
				send -X cursor-down
				send -X start-of-line
				send -X other-end
				send -X next-paragraph
				send -X cursor-up
				send -X end-of-line
			}{ if -F '#{==:%1,"}' {
				send -X jump-to-backward '"'
				send -X other-end
				send -X jump-to-forward '"'
			}{ if -F "#{==:%1,'}" {
				send -X jump-to-backward "'"
				send -X other-end
				send -X jump-to-forward "'"
			}}}}}
		}
	} {
		send -X cancel
	}

# 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 \
	if -F "#{e|>:#{scroll_position},0}" {
		send-keys -X scroll-down
		if -F "#{e|>:#{copy_cursor_y},#{scroll_region_upper}}" {
			send-keys -X cursor-up
		}
	}

bind -T copy-mode-vi C-y \
	if -F "#{e|<:#{scroll_position},#{history_size}}" {
		send-keys -X scroll-up
		if -F "#{e|<:#{copy_cursor_y},#{scroll_region_lower}}" {
			send-keys -X cursor-down
		}
	}

# 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 -r h selectp -L
bind -r j selectp -D
bind -r k selectp -U
bind -r l selectp -R

# 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

# 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"