Avoiding setting same variables multiple times

[pauline-galea]

I am working on a bash script with functions that can print text
in colour.

As you can see from the code below, to be able to use
"secn_Rd" I have to call "ansi-colr-codes" at the beginning of the
function "section-spec".

Because I have other functions defined in the bash script, I might
have to call a function to initialise variables that may have already
been available.  Is there any neat way to set the variables but not end
up setting them multiple times?

function ansi-colr-codes()
  {
    nc="\e[0m"      # reset to normal colours
    dBk="\e[2;30m"  # black   foreground
    dRd="\e[2;31m"  # red     foreground
    dGn="\e[2;32m"  # green   foreground
    dYl="\e[2;33m"  # yellow  foreground
    dBl="\e[2;34m"  # blue    foreground
    dMg="\e[2;35m"  # magenta foreground
    dCy="\e[2;36m"  # cyan    foreground
    dWh="\e[2;37m"  # white   foreground
  }

function section-spec()
  {
    ansi-colr-codes
    secn_Nc="%s\n"
    secn_Bk="${bBk}%s${nc}\n"
    secn_Rd="${bRd}%s${nc}\n"
    secn_Gn="${bGn}%s${nc}\n"
    secn_Yl="${bYl}%s${nc}\n"
    secn_Bl="${bBl}%s${nc}\n"
    secn_Mg="${bMg}%s${nc}\n"
    secn_Cy="${bCy}%s${nc}\n"
    secn_Wh="${bWh}%s${nc}\n"
  }