Make tmux.conf work on different versions

assets/default/dotfiles/tmux.conf

@@ -12,16 +12,11 @@ set -g default-terminal "screen-256color"
 unbind C-b
 set -g prefix C-q
 
-# Enable mouse mode 2.1+
-set-option -g mouse on
-
 # easy splitting
 bind | split-window -h -c "#{pane_current_path}"
 bind - split-window -c "#{pane_current_path}"
 bind _ split-window -c "#{pane_current_path}"
 
-# act like vim
-setw -g mode-keys vi
 # move between panes
 bind C-q select-pane -t :.+
 bind h select-pane -L
@@ -35,18 +30,51 @@ bind -r K swap-pane -U
 bind C-j command-prompt -p "Join pane from:"  "join-pane -s '%%'"
 bind C-s command-prompt -p "Send pane to:"  "join-pane -t '%%'"
 bind C-b break-pane
-# use vim style copy mode
-unbind [
-bind ` copy-mode
-bind -t vi-copy v begin-selection
-bind -t vi-copy V rectangle-toggle
-bind -t vi-copy y copy-selection
+
+# based on https://stackoverflow.com/a/40902312/1046584
+run-shell "tmux setenv -g TMUX_VERSION $(tmux -V | cut -c 6-)"
+
+# In version 2.1 "mouse" replaced the previous 4 mouse options
+if-shell -b '[ "$(echo "$TMUX_VERSION >= 2.1" | bc)" = 1 ]' \
+  "set -g mouse on"
+
+# UTF8 is autodetected in 2.2 onwards, but errors if explicitly set
+if-shell -b '[ "$(echo "$TMUX_VERSION < 2.2" | bc)" = 1 ]' \
+  "set -g utf8 on; set -g status-utf8 on; set -g mouse-utf8 on"
+
+# New keybindings for vi-mode
+# https://github.com/tmux/tmux/issues/754
+setw -g mode-keys vi
+if-shell -b '[ "$(echo "$TMUX_VERSION >= 2.4" | bc)" = 1 ]' \
+   'bind -T copy-mode-vi v send-keys -X begin-selection ; \
+      bind -T copy-mode-vi C-v send-keys -X rectangle-toggle ; \
+   bind -T copy-mode-vi y send-keys -X copy-selection ; \
+   bind -T copy-mode-vi H send-keys -X start-of-line ; \
+   bind -T copy-mode-vi L send-keys -X end-of-line ; \
+   bind -T choice-mode-vi h send-keys -X tree-collapse ; \
+   bind -T choice-mode-vi l send-keys -X tree-expand ; \
+   bind -T choice-mode-vi H send-keys -X tree-collapse-all ; \
+   bind -T choice-mode-vi L send-keys -X tree-expand-all ; \
+   bind -T copy-mode-emacs MouseDragEnd1Pane send-keys -X copy-pipe "pbcopy"; \
+   bind -T copy-mode-vi MouseDragEnd1Pane send-keys -X copy-pipe "pbcopy"; ' \
+      'bind -t vi-copy v begin-selection; \
+         bind -t vi-copy C-v rectangle-toggle; \
+   bind -t vi-copy y copy-selection; \
+   bind -t vi-choice h tree-collapse; \
+   bind -t vi-choice l tree-expand; \
+   bind -t vi-choice H tree-collapse-all; \
+   bind -t vi-choice L tree-expand-all; \
+   bind -t emacs-copy MouseDragEnd1Pane copy-pipe "pbcopy"; \
+   bind -t vi-copy MouseDragEnd1Pane copy-pipe "pbcopy"; '
+
+# bind p for put
 unbind p
 bind p paste-buffer
 # rebind previous-window
 bind b previous-window
 
 # after copying to a tmux buffer, hit y again to copy to clipboard
+unbind y
 if-shell 'test "$(uname -s)" = "Darwin"' 'bind y run "tmux show-buffer | pbcopy"'
 if-shell 'test "$(uname -s)" = "Linux"' 'bind y run "tmux show-buffer | xclip -sel clip -i"'