#! /usr/bin/env bash

# file      : etc/lowercase-headers
# license   : MIT; see accompanying LICENSE file

# Create all-lowercase symlinks for .h headers in <dir> (recursively) that
# contain capital letters in their names.
#
usage="usage: $0 <dir>"

trap "{ exit 1; }" ERR
set -o errtrace # Trap in functions.

function error () { echo "$*" 1>&2; exit 1; }

if [ $# -eq 0 ]; then
  error "$usage"
fi

for d in "$@"; do
  find "$d" -type f -name '*[[:upper:]]*.h' |
    while read f; do
      b="$(basename "$f")"
      d="$(dirname "$f")"
      ln -s "$b" "$d/${b,,}"
    done
done