rule and rulem bash functions coverted to Fish by Jay Berringer

rule.fish

#|------------------------------------------------------------------------------
#|	Print a ruler in terminal window
#|
#|		set -l _hr..printf assigns the result of the string interpolation to the local variable “_hr”
#|		%*s waits for numeric input to define the width of the string, which in this case will be output #|			as that number of spaces
#|		(tput cols) is replaced with the number of columns in the current terminal as reported by tput
#|			(passed to the %*s)
#|		The variable is then output with sed substitution to	replace the spaces with a - (default) or the #|			desired character
#|------------------------------------------------------------------------------
function rule
	set -l _hr (printf "%*s" (tput cols))
	if test -z $argv
		printf $_hr | sed -e s/ /\-/g
	else
		printf $_hr | sed -e s/ /\$argv/g
	end
end

#|------------------------------------------------------------------------------
#|	Print a ruler in terminal window with message
#|
#|		set -l _hr..printf assigns the result of the string interpolation to the local variable “_hr”
#|		%*s waits for numeric input to define the width of the string, which in this case will be output #|			as that number of spaces
#|		(tput cols) is replaced with the number of columns in the current terminal as reported by tput
#|			(passed to the %*s)
#|		The variable is then output with sed substitution to	replace the spaces with a - (default) or the #|			desired character
#|------------------------------------------------------------------------------
function rulem
	set -l _hr (printf "%*s" (tput cols))
	if test -z $argv[1]
		echo "Usage: rulem MESSAGE [RULE_CHARACTER]"
		return
	else
		if test (count $argv) -eq 2
			printf "$_hrr33[2C$argv[1]" | sed -e s/ /\$argv[2]/g
		else
			printf "$_hrr33[2C$argv[1]" | sed -e s/ /\-/g
		end
	end
end

How to use this? (please notify me if you answer)

@BarbzYHOOL, in the fish shell, you can define custom functions from the command line. If you paste the whole contents above into fish, then you can call rule or rulem. Looks like they accept arguments too. Then if you follow up with funcsave rule for example, it'll save the function to a file called rule.fish in ~/.config/fish/functions or wherever