The Window Contract defines how tmux windows are represented in the status bar.

Windows have states (active/inactive/etc.) and can display dynamic icons based on the running command.

PowerKit maps running commands to icons:

Current command: "nvim src/main.rs"
    ↓
Match pattern: "nvim"
    ↓
Icon:
    ↓
Window displays:  main.rs

Default window format:

{icon} {window_name}:{pane_index}

Example: src:1

# Window format
set -g @powerkit_window_format "#{window_index}:#{window_name}"

# Show window flags
set -g @powerkit_window_show_flags "true"

# Icon for current directory
set -g @powerkit_window_directory_icon ""

# Window index display style
set -g @powerkit_window_index_style "numeric"

The @powerkit_window_index_style option controls how window indices are displayed:

For indices 10+, composite icons are generated dynamically (e.g., 10 = 󰬺󰬹, 11 = 󰬺󰬺).

For text style with indices >= 100, the numeric value is displayed as-is.

Active:     1:vim      (purple background)
Inactive:   2:shell    (gray background)
Activity:   3:build #  (gray + indicator)
Zoomed:     4:logs Z   (with zoom indicator)

Add custom mappings via options:

set -g @powerkit_window_icon_myapp ""

• Session Contract - Session representation
• Pane Contract - Pane representation
• Theme Contract - Color definitions
• Configuration - Window options