chore(config): tmux config tweaks

- undercurl support
- underscore colors
- nvim split aware moving
- detach-on-destroy off
- session name display in status-right
- escape-time to zero
- default terminal to use $TERM

config/tmux/tmux.conf

@@ -25,6 +25,13 @@ bind -n M-Right select-pane -R
 bind -n M-Up    select-pane -U
 bind -n M-Down  select-pane -D
 
+# Smart pane switching with awareness of vim splits
+is_vim='echo "#{pane_current_command}" | grep -iqE "(^|\/)g?(view|n?vim?)(diff)?$"'
+bind -n C-h if-shell "$is_vim" "send-keys C-h" "select-pane -L"
+bind -n C-j if-shell "$is_vim" "send-keys C-j" "select-pane -D"
+bind -n C-k if-shell "$is_vim" "send-keys C-k" "select-pane -U"
+bind -n C-l if-shell "$is_vim" "send-keys C-l" "select-pane -R"
+
 # Reload tmux config with <prefix> + r
 bind r source-file ~/.dotfiles/config/tmux/tmux.conf \; display "tmux cfg reloaded!"
 
@@ -70,8 +77,13 @@ bind p paste-buffer
 #  │ Settings                                                 │
 #  ╰──────────────────────────────────────────────────────────╯
 
-set -g default-terminal "tmux-256color"
-set -ag terminal-overrides ",xterm-256color:RGB"
+# Undercurl
+set -g default-terminal "${TERM}"
+set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'  # undercurl support
+set -as terminal-overrides ',*:Setulc=\E[58::2::::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'  # underscore colors - needs tmux-3.0
+
+# set -g default-terminal "tmux-256color"
+# set -ag terminal-overrides ",xterm-256color:RGB"
 
 # Setting status on
 set -g status "on"
@@ -108,6 +120,12 @@ set-option -g renumber-windows on
 # set vi-mode
 set-window-option -g mode-keys vi
 
+# don't detach tmux when killing a session
+set -g detach-on-destroy off
+
+# address vim mode switching delay (http://superuser.com/a/252717/65504)
+set -s escape-time 0
+
 #  ╭──────────────────────────────────────────────────────────╮
 #  │ Theme                                                    │
 #  ╰──────────────────────────────────────────────────────────╯
@@ -121,7 +139,7 @@ set-option -g status-left ''
 set-option -g window-status-format ' #I:#W '
 set-option -g window-status-current-format ' #I:#W#{?window_zoomed_flag, ◈ ,} '
 
-set-option -g status-right "#{hostname_short}/#(tms sessions) #{tmux_mode_indicator}"
+set-option -g status-right "#S@#{hostname_short} #{tmux_mode_indicator}"
 
 set -g pane-border-style "fg=#3b4261"
 set -g pane-active-border-style "fg=#7aa2f7"