Testing out argument handling

args_tables.sh

#!/bin/bash
set -u

suffixes=( "-" ":-" "+" ":+" "+x" ":+x" )

function header {
  printf "%10s | " "\$#"
  printf "%10s | " "\$*"
  for predicate in "-n" "-z"; do
    for suffix in "${suffixes[@]}"; do
      header=$(printf '%s ${1%s%s}' $predicate $suffix)
      printf "%10s | " "$header"
    done
  done
  echo
}

function test {
  printf "%10s | " "\`$#\`"
  printf "%10s | " "\`$*\`"
  for predicate in "-n" "-z"; do
    for suffix in "${suffixes[@]}"; do
      str="if [[ $predicate "\${1${suffix}}" ]]; then printf '%10s | ' 'T'; else printf '%10s | ' 'F'; fi"
      eval $str
    done
  done
  echo
}

header
test
test ""
test "arg"

output

./args_table.sh
        $# |         $* |   -n ${1-} |  -n ${1:-} |   -n ${1+} |  -n ${1:+} |  -n ${1+x} | -n ${1:+x} |   -z ${1-} |  -z ${1:-} |   -z ${1+} |  -z ${1:+} |  -z ${1+x} | -z ${1:+x} |
       `0` |         `` |          F |          F |          F |          F |          F |          F |          T |          T |          T |          T |          T |          T |
       `1` |         `` |          F |          F |          F |          F |          T |          F |          T |          T |          T |          T |          F |          T |
       `1` |      `arg` |          T |          T |          F |          F |          T |          T |          F |          F |          T |          T |          F |          F |