feat(nav): vim-aware alt+h/j/k/l resize for smart-splits.nvim

tmux.conf

@@ -33,13 +33,14 @@ bind -N "Focus pane right" -n C-M-Right select-pane -R
 bind -N "Focus pane up" -n C-M-Up select-pane -U
 bind -N "Focus pane down" -n C-M-Down select-pane -D
 
-# ctrl+h/j/k/l: vim-aware pane navigation, the tmux half of nvim's
+# ctrl+h/j/k/l: vim-aware pane navigation, the tmux half of smart-splits.nvim
-# config.pane_nav. In an nvim/vim/fzf pane the key is forwarded so nvim moves
+# (nvim's config.pane_nav hands tmux panes to it). In an nvim/vim/fzf pane the
-# between its own splits and, at its outer edge, hands off with
+# key is forwarded so nvim moves between its own splits and, at its outer edge,
-# `tmux select-pane -t $TMUX_PANE`; elsewhere tmux moves directly. "Is vim" is
+# selects the tmux pane itself; elsewhere tmux moves directly. "Is vim" is
-# smart-splits' @pane-is-vim pane option or the pane's foreground command, read
+# smart-splits' @pane-is-vim pane option or the pane's foreground command
-# as a format (no ps fork per keypress). Ghostty passes these keys through
+# (vim without smart-splits, fzf), read as a format (no ps fork per keypress).
-# (keybind = clear); prefix + ctrl+l is the clear-screen escape hatch.
+# Ghostty passes these keys through (keybind = clear); prefix + ctrl+l is the
+# clear-screen escape hatch.
 bind -N "Focus pane left (vim-aware)" -n C-h if -F '#{||:#{@pane-is-vim},#{m/r:^(n?vim|vim|fzf)$,#{pane_current_command}}}' 'send-keys C-h' 'select-pane -L'
 bind -N "Focus pane down (vim-aware)" -n C-j if -F '#{||:#{@pane-is-vim},#{m/r:^(n?vim|vim|fzf)$,#{pane_current_command}}}' 'send-keys C-j' 'select-pane -D'
 bind -N "Focus pane up (vim-aware)" -n C-k if -F '#{||:#{@pane-is-vim},#{m/r:^(n?vim|vim|fzf)$,#{pane_current_command}}}' 'send-keys C-k' 'select-pane -U'
@@ -55,6 +56,15 @@ bind -N "Resize pane down" -n C-M-S-Down resize-pane -D 5
 bind -N "Resize pane up" -n C-M-S-Up resize-pane -U 5
 bind -N "Resize pane right" -n C-M-S-Right resize-pane -R 5
 
+# alt+h/j/k/l: vim-aware resize, smart-splits' resize keys. An @pane-is-vim
+# pane gets the key, so smart-splits resizes its split and, at its outer edge,
+# the tmux pane; elsewhere tmux resizes by 3, smart-splits' default amount.
+# Only @pane-is-vim forwards: vim/fzf without smart-splits have no resize binds.
+bind -N "Resize pane left (vim-aware)" -n M-h if -F '#{@pane-is-vim}' 'send-keys M-h' 'resize-pane -L 3'
+bind -N "Resize pane down (vim-aware)" -n M-j if -F '#{@pane-is-vim}' 'send-keys M-j' 'resize-pane -D 3'
+bind -N "Resize pane up (vim-aware)" -n M-k if -F '#{@pane-is-vim}' 'send-keys M-k' 'resize-pane -U 3'
+bind -N "Resize pane right (vim-aware)" -n M-l if -F '#{@pane-is-vim}' 'send-keys M-l' 'resize-pane -R 3'
+
 # Window navigation
 bind -N "Rename window" r command-prompt -I "#W" "rename-window -- '%%'"
 bind -N "Create window" c new-window -c "#{pane_current_path}"