rwxrob-dot/scripts/htitle

#!/usr/bin/env bash

# Produces a centered title in the middle of a horizontal rule of text.

pre='//'

_filter(){
  [[ -n "$1" ]] && return 1
  while IFS= read -ra args; do
    "${FUNCNAME[1]}" "${args[@]}"
  done
}

htitle() {
  _filter "$@" && return $?
  local str="$1" char="${2:--}"
  local -i len=${#str}
  local -i side=$((((HRULEWIDTH / 2) - len / 2) - 3))
  local -i left=$side
  local -i right=$side
  (( len % 2 == 1 )) && ((right -= 1))
  echo "$pre $(echon "$char" "$left") "$str" $(echon "$char" "$right")"
}

htitle "$@"