merge-kernel-configs


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#!/bin/bash

# merge-kernel-configs $out
# (reads from stdin)

rm -f "$1"
touch "$1"

while read -r line; do
  variable=$(
    printf '%s\n' "${line}" | \
      sed '
        s/^# \(\S\+\) is not set$/\1/
        t
        s/=.*$//
        t
        d
      '
  )
  if [ -z "${variable}" ] || \
    grep -q '^\(# \)\?'"${variable}"'[= ]' "$1"; then
    continue
  fi
  printf '%s\n' "${line}" >> \
    "$1"
done