ini_edit

#!/bin/bash

set -euo pipefail

usage() {
  printf -- "%s : usage : %s source-ini key1 key2 -p regex-key key 3" "$0" "$0"
}

regexs=()
args=()
list=()
dryRun=false
while (("$#")); do
  case "$1" in
  -p | --regex | --perl-regex)
    shift
    regexs+=("$1")
    ;;
  -n | --dry-run)
    dryRun=true
    ;;
  --help | -h)
    usage
    exit 0
    ;;
  --)
    shift
    args+=("$@")
    ;;
  *)
    args+=("$1")
    ;;
  esac
  shift
done

set -- "${args[@]}"

source=$1
shift
dest=$1
shift

if test "$#" -gt 0; then
  list+=("$@")
fi

for regex in "${regexs[@]}"; do
  mapfile -t newKeys < <(grep -Po -- "[^=]*${regex}[^=]*=" "$dest")
  for newKey in "${newKeys[@]}"; do
    list+=("${newKey%=}")
  done
done


if $dryRun; then
  useSed="echo sed"
else
  useSed="sed"
fi

for seditem in "${list[@]}"; do
  $useSed -r "s#${seditem}=.*#$(grep -E -- "${seditem}=" "$source" | sed 's/#/\#/')#" -i "$dest"
done