.tmux.conf

# Tim's tmux configuration
# Set zsh as default shell (auto-detect path)
set-option -g default-shell /bin/zsh
set-option -g default-command /bin/zsh

# Mouse support
set -g mouse on

# Colors and terminal compatibility
set -g default-terminal "tmux-256color"
set -g allow-passthrough all

# Terminal overrides for Ghostty and modern terminals
# Include xterm:Tc for SSH sessions where TERM gets downgraded
set -ga terminal-overrides ",xterm-ghostty:Tc,xterm-256color:Tc,tmux-256color:Tc,xterm:Tc"

# Enable hyperlinks (OSC 8) - allows Cmd+click on URLs in Ghostty
set -ga terminal-features ",xterm-ghostty:hyperlinks"

# Forward modified keys (e.g. Shift+Enter) to terminal apps
set -g extended-keys on
set -ga terminal-features ",xterm-ghostty:extkeys"

# Cursor settings - enable blinking
set -ga terminal-overrides '*:Ss=\E[%p1%d q:Se=\E[2 q'
set -g cursor-style blinking-block

# Start numbering at 1
set -g base-index 1
setw -g pane-base-index 1

# Prefix key: Ctrl-Space
unbind C-b
set -g prefix C-Space
bind C-Space send-prefix

# Reload config
bind r source-file ~/.tmux.conf \; display-message "Config reloaded!"

# Better splits
bind \\ split-window -h
bind - split-window -v

# Smart pane switching with Alt+arrow (no prefix needed)
bind -n M-Left select-pane -L
bind -n M-Right select-pane -R
bind -n M-Up select-pane -U
bind -n M-Down select-pane -D

# Alternative: Ctrl+h/j/k/l for vim-style navigation (no prefix needed)
# C-h and C-l wrap across windows and land on the edge-most pane in that direction
bind -n C-h if-shell -F "#{pane_at_left}" \
  'run-shell "~/.tmux/wrap-nav.sh left"' \
  'select-pane -L'
bind -n C-j select-pane -D
bind -n C-k select-pane -U
bind -n C-l if-shell -F "#{pane_at_right}" \
  'run-shell "~/.tmux/wrap-nav.sh right"' \
  'select-pane -R'

# Pane navigation in copy mode (stay in copy mode on the original pane)
bind -T copy-mode-vi C-h select-pane -L
bind -T copy-mode-vi C-j select-pane -D
bind -T copy-mode-vi C-k select-pane -U
bind -T copy-mode-vi C-l select-pane -R

# Vi mode
setw -g mode-keys vi

# Increase scrollback
set -g history-limit 10000

# Reduce escape delay
set -sg escape-time 0

# Dim inactive panes (foreground only)
# NOTE: Requires fresh tmux server start to take effect reliably
set -g window-style 'fg=colour247'
set -g window-active-style 'fg=colour255'

# Layout philosophy:
#   Status bar  = per-window info (tabs, session, machine identity, clock)
#   Pane border = per-pane info (cwd — each pane can be in a different directory)
#   Left side   = interactive (tabs you click/switch between)
#   Right side  = reference (glance-at info that rarely changes)
#   Uniform dark grey for everything except the active tab (white).
#   Keeps the UI quiet — only what matters right now draws the eye.

# Pane borders - per-pane working directory
set -g pane-border-style 'bg=default,fg=colour240'
set -g pane-active-border-style 'bg=default,fg=colour240'
set -g pane-border-lines single
setw -g pane-border-status top
setw -g pane-border-format "  #[fg=colour239]#{pane_current_path}  "

# Status bar - single row, left-aligned tabs
set -g status on
set -g status-position top
set -g status-justify left
set -g status-style 'bg=default,fg=colour250'
set -g status-interval 60
set -g status-left-length 10
set -g status-right-length 100

# Left: tabs start immediately (no session prefix cluttering the interactive side)
set -g status-left " "

# Right: session │ clock (PST)
set -g status-right "#[fg=colour239] #S │ #(TZ=America/Los_Angeles date '+%%b %%d %%H:%%M') "

# Window tabs - active is white, inactive is mid-grey (readable but distinct)
# When @renaming is set (prefix+R), show "..." briefly while generating a name
set -g window-status-format " #W "
set -g window-status-style "bg=default,fg=colour245"
set -g window-status-current-format "#{?@renaming, ... , #W }"
set -g window-status-current-style "bg=default,fg=colour255"
set -g window-status-separator "#[bg=default,fg=colour245]│"

# Window naming
set -g automatic-rename off
set -g renumber-windows on

# Pass window name to terminal (Ghostty/terminal tab title)
# Uses BOX_PROVIDER env var if set (gcp, pi, neb, aws), otherwise just window name
set -g set-titles on
set -g set-titles-string "#{?BOX_PROVIDER,#{BOX_PROVIDER}: ,}#W"

# Force AI rename with prefix + R (bypasses debounce, renames ALL windows)
bind R set -g @renaming 1 \; run-shell "~/.tmux/ai-describe-pane.sh --force --all 2>/dev/null || true"

# Keep prefix+d for the standard detach behavior; avoid binding rename helpers to prefix keys.
bind d detach

# Auto-update window names (AI summarizes all panes in window)
# Note: '|| true' suppresses errors if llm CLI is not installed
set-hook -g after-select-pane "run-shell -b '~/.tmux/ai-describe-pane.sh 2>/dev/null || true'"
set-hook -g after-split-window "run-shell -b '~/.tmux/ai-describe-pane.sh 2>/dev/null || true'"
set-hook -g after-new-window "run-shell -b '~/.tmux/ai-describe-pane.sh 2>/dev/null || true'"
set-hook -g pane-exited "run-shell -b '~/.tmux/ai-describe-pane.sh 2>/dev/null || true'"

# Activity monitoring
setw -g monitor-activity on
set -g visual-activity off
set -g window-status-activity-style 'fg=colour246'