added brew_filter_in_setup.sh

brew_filter_in_setup.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+#  vim:ts=4:sts=4:sw=4:et
+#  args: vim bash git
+#
+#  Author: Hari Sekhon
+#  Date: 2020-08-24 12:12:43 +0100 (Mon, 24 Aug 2020)
+#
+#  https://github.com/harisekhon/bash-tools
+#
+#  License: see accompanying Hari Sekhon LICENSE file
+#
+#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
+#
+#  https://www.linkedin.com/in/harisekhon
+#
+
+set -euo pipefail
+[ -n "${DEBUG:-}" ] && set -x
+srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# shellcheck disable=SC1090
+. "$srcdir/lib/utils.sh"
+
+# shellcheck disable=SC1090
+. "$srcdir/lib/packages.sh"
+
+# shellcheck disable=SC2034,SC2154
+usage_description="
+Checks a given list of Mac Homebrew packages and returns those that are already recorded in setup/brew-packages-*.txt
+
+$package_args_description
+
+Supports TAP=1 environment variables for checking taps list instead
+
+Tested on Mac Homebrew
+"
+
+# used by usage() in lib/utils.sh
+# shellcheck disable=SC2034
+usage_args="<packages>"
+
+help_usage "$@"
+
+# process_package_args requires much more specific env var to disambiguate
+HOMEBREW_PACKAGES_TAP="${TAP:-}"
+
+process_package_args "$@" |
+if [ -n "${HOMEBREW_PACKAGES_TAP:-}" ]; then
+    while read -r tap package; do
+        grep -Eq "^${tap}[[:space:]]+$package$" <(sed 's/#.*//; /^[[:digit:]]*$/d' "$srcdir/setup/"brew-packages*taps.txt) &&
+        echo "$tap $package"
+    done
+else
+    # do not quote cask, blank quotes break shells and there will never be any token splitting anyway
+    # shellcheck disable=SC2046
+    tr ' ' '\n' |
+    grep -Fx -f <(sed 's/#.*//; s/^[[:space:]]*//; s/[[:space:]]*$//; /^[[:digit:]]*$/d' "$srcdir/setup/"brew-packages*.txt)
+fi