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Follow light/dark appearance in the tmux status bar

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The status bar was five hardcoded tangere-dark colours, so in light mode the
pale #fdfdd9 text landed on a white background and became unreadable. That was
the real reason Auto appearance "never worked with the terminal setup" — ghostty
was switching correctly all along.

Split the colours into tmux-light.conf and tmux-dark.conf. The dark file is
extracted byte-exact from the previous config; the light file is the same layout
with each colour swapped for the tangere-light palette entry at the same index,
so roles are preserved (text on an accent uses the theme background, which
inverts from #1a2938 to #fdfdfa).

tmux 3.6+ learns the terminal's theme over OSC 2031, so this keys off the
appearance change itself rather than a schedule, and behaves identically whether
that came from Auto at sunrise/sunset or a manual toggle. Three hooks: the two
theme hooks react to a change, and client-attached covers a client attaching
mid-way, since those two only fire on a change. Sourcing is idempotent so the
overlap is harmless.

This replaces the dark-mode-notify launchd agent removed in 59d5622, which could
not have worked: it re-sourced .zshrc inside each shell, but the status bar
belongs to the tmux server.

Verified by round trip: flipping to Light switched #{client_theme} and applied
the light palette, and returning to Dark restored it. A running nvim does not
follow a live change (docs: the TUI sets 'background' on startup); noted in the
README.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jonny Barnes 2026-08-09 12:38:16 +01:00
commit 6b3ab420ad
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5 changed files with 73 additions and 17 deletions
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@ -33,9 +33,6 @@ set -g default-terminal "$TERM"
# Allow OSC 8 links
set -ga terminal-features "*:hyperlinks"
# Tweak status bar styles
set -g status-style bg=default,fg='#fdfdd9'
# Set status bar length
set -g status-left-length 40
set -g status-right-length 60
@ -43,14 +40,16 @@ set -g status-right-length 60
# Center the window list
set -g status-justify centre
# Left side: session name with blue accent
set -g status-left "#[fg=#1a2938,bg=#8fb4cd,bold] #S #[fg=#8fb4cd,bg=default]\ue0b0"
# Status bar colours live in ~/.tmux-light.conf and ~/.tmux-dark.conf. tmux
# learns the terminal's theme over OSC 2031, so this reacts to the appearance
# change itself, whether that came from Auto at sunrise/sunset or a manual
# toggle, since nothing here knows why it changed.
set-hook -g client-light-theme 'source-file ~/.tmux-light.conf'
set-hook -g client-dark-theme 'source-file ~/.tmux-dark.conf'
# Right side: multi-segment with transitions
set -g status-right "#[fg=#6dafb5,bg=default]\ue0b2#[fg=#1a2938,bg=#6dafb5] %H:%M #[fg=#bb98d9,bg=#6dafb5]\ue0b2#[fg=#1a2938,bg=#bb98d9] %d-%b "
# Those hooks only fire on a change, so also pick the right palette whenever a
# client attaches. Sourcing is idempotent, so the overlap is harmless.
set-hook -g client-attached 'if -F "#{==:#{client_theme},light}" "source-file ~/.tmux-light.conf" "source-file ~/.tmux-dark.conf"'
# Inactive windows (no powerline symbols)
setw -g window-status-format "#[fg=#2f4656,bg=default] #I #W "
# Active window (cyan highlight, no powerline)
setw -g window-status-current-format "#[fg=#1a2938,bg=#6dafb5,bold] #I #W "
# Default before any client has attached and reported a theme.
source-file ~/.tmux-dark.conf