dot-tmux-highlight.conf

#!/usr/bin/env bash

set -e

# Place holder for status left/right
place_holder="\#{prefix_highlight}"

# Possible configurations
fg_color_config='@prefix_highlight_fg'
bg_color_config='@prefix_highlight_bg'
output_prefix='@prefix_highlight_output_prefix'
output_suffix='@prefix_highlight_output_suffix'
show_copy_config='@prefix_highlight_show_copy_mode'
show_sync_config='@prefix_highlight_show_sync_mode'
copy_attr_config='@prefix_highlight_copy_mode_attr'
sync_attr_config='@prefix_highlight_sync_mode_attr'
prefix_prompt='@prefix_highlight_prefix_prompt'
copy_prompt='@prefix_highlight_copy_prompt'
sync_prompt='@prefix_highlight_sync_prompt'
empty_prompt='@prefix_highlight_empty_prompt'
empty_attr_config='@prefix_highlight_empty_attr'
empty_has_affixes='@prefix_highlight_empty_has_affixes'

tmux_option() {
    local -r value=$(tmux show-option -gqv "$1")
    local -r default="$2"

    if [ -n "$value" ]; then
        echo "$value"
    else
        echo "$default"
    fi
}

format_style() {
    echo "#[${1}]" | sed -e 's/,/]#[/g'
}

# Defaults
default_fg='colour231'
default_bg='colour04'
default_copy_attr='fg=default,bg=yellow'
default_sync_attr='fg=default,bg=yellow'
default_empty_attr='fg=default,bg=default'
default_prefix_prompt=$(tmux_option prefix | tr "[:lower:]" "[:upper:]" | sed 's/C-/\^/')
default_copy_prompt='Copy'
default_sync_prompt='Sync'
default_empty_prompt=''

main() {
    local -r \
        fg_color=$(tmux_option "$fg_color_config" "$default_fg") \
        bg_color=$(tmux_option "$bg_color_config" "$default_bg") \
        show_copy_mode=$(tmux_option "$show_copy_config" "off") \
        show_sync_mode=$(tmux_option "$show_sync_config" "off") \
        output_prefix=$(tmux_option "$output_prefix" " ") \
        output_suffix=$(tmux_option "$output_suffix" " ") \
        copy_attr=$(tmux_option "$copy_attr_config" "$default_copy_attr") \
        sync_attr=$(tmux_option "$sync_attr_config" "$default_sync_attr") \
        prefix_prompt=$(tmux_option "$prefix_prompt" "$default_prefix_prompt") \
        copy_prompt=$(tmux_option "$copy_prompt" "$default_copy_prompt") \
        sync_prompt=$(tmux_option "$sync_prompt" "$default_sync_prompt") \
        empty_prompt=$(tmux_option "$empty_prompt" "$default_empty_prompt") \
        empty_attr=$(tmux_option "$empty_attr_config" "$default_empty_attr") \
        empty_has_affixes=$(tmux_option "$empty_has_affixes" "off")

    local -r prefix_highlight="$(format_style "fg=$fg_color,bg=$bg_color")"
    local -r prefix_mode="$prefix_highlight$output_prefix$prefix_prompt$output_suffix"

    local -r copy_highlight="$(format_style "${copy_attr:+default,$copy_attr}")"
    local -r copy_mode="$copy_highlight$output_prefix$copy_prompt$output_suffix"

    local -r sync_highlight="$(format_style "${sync_attr:+default,$sync_attr}")"
    local -r sync_mode="$sync_highlight$output_prefix$sync_prompt$output_suffix"

    local -r empty_highlight="$(format_style "${empty_attr:+default,$empty_attr}")"
    if [[ "on" = "$empty_has_affixes" ]]; then
        local -r empty_mode="$empty_highlight$output_prefix$empty_prompt$output_suffix"
    else
        local -r empty_mode="$empty_highlight$empty_prompt"
    fi

    if [[ "on" = "$show_copy_mode" ]]; then
        if [[ "on" = "$show_sync_mode" ]]; then
            local -r fallback="#{?pane_in_mode,$copy_mode,#{?synchronize-panes,$sync_mode,$empty_mode}}"
        else
            local -r fallback="#{?pane_in_mode,$copy_mode,$empty_mode}"
        fi
    elif [[ "on" = "$show_sync_mode" ]]; then
        local -r fallback="#{?synchronize-panes,$sync_mode,$empty_mode}"
    else
        local -r fallback="$empty_mode"
    fi

    local -r highlight="#{?client_prefix,$prefix_mode,$fallback}#[default]"

    local -r status_left_value="$(tmux_option "status-left")"
    tmux set-option -gq "status-left" "${status_left_value/$place_holder/$highlight}"

    local -r status_right_value="$(tmux_option "status-right")"
    tmux set-option -gq "status-right" "${status_right_value/$place_holder/$highlight}"
}

main