# $(1) = title; $(2) = color; $(3) = left, center, right
define draw_line
    @ \
    printf '%.0s-' {1..$(shell tput cols)}; \
    if test "$(1)"; then \
        cols=$(shell tput cols); \
        length=$(shell echo $(1) | awk '{print length}'); \
        case "$(3)" in \
            *right)  let indent="length + 1" ;; \
            *center) let indent="cols - (cols - length) / 2" ;; \
            *left|*) let indent="cols" ;; \
        esac; \
        tput cub $$indent; \
        test "$(2)" && printf $$(tput setaf $(2)); \
        printf '$(1)'; \
        test "$(2)" && printf $$(tput sgr0); \
    fi; \
    echo
endef