Small wrapper for fast address lookup in mutt/alot/... of the addresses in khard and gpg keyring,

lbdb.mk

#!/usr/bin/make -f

# A rewimplementation of the idea of lbdb in as a make file.

CACHE = ~/.cache/lbdb
SHARE = \
	/usr/share       \
	/usr/local/share \
	~/.local/share

# This names all the methods used and also their priority.  The first an email
# address is found in several sources only the first one will be used.
LISTS = \
	khard \
	gpg \
	inmail \

DONTBUILD = \
	    $(GNUPGHOME)/pubring.kbx    \
	    ~/.local/share/khard/main/*.vcf \
	    $(MAILS)

SORT = sort --uniq --field-separator='	' --key=1,1

$(CACHE)/lbdb: $(patsubst %,$(CACHE)/%.sorted,$(LISTS))
	$(SORT) $^ > $@

$(CACHE)/inmail.list: ~/.config/lbdb/m_inmail.list
	cp -f $< $@

$(CACHE)/khard.list: ~/.local/share/khard/main/????????????????????????????????????.vcf
	khard email --parsable --display first_name --remove-first-line \
	| sed 's/\t[^\t]*$$/\t@/'                                       \
	> $@

ifndef GNUPGHOME
  GNUPGHOME = ~/.gnupg
endif
$(CACHE)/gpg.list: $(GNUPGHOME)/pubring.kbx
	gpg --list-keys --with-colons 2>/dev/null \
	| sed -n -e '/^\(pub\|uid\):[^re]:\([^:]*:\)\{7,7\}[^<>:]* <[^<>@: ]*@[^<>@: ]*>[^<>@:]*:/ {' \
		 -e '  s/^\([^:]*:\)\{9,9\}\([^<:]*\) <\([^>:]*\)>.*:.*$$/\3	\2	(GnuPG)/'     \
		 -e '  s/	\([^	]\{27,27\}\)[^	]*	/	\1...	/'                    \
		 -e '  p'                                                                             \
		 -e '}'                                                                               \
	> $@

# The *.list files depend on the cache directory.
$(foreach target,$(LISTS),$(eval $(CACHE)/$(target).list: $(CACHE)/.dir))
# Some entries need to be normalized.
$(CACHE)%.normalized: $(CACHE)/%.list
	cat $< > $@
# Sort each source individually, just in case we might need it.
$(CACHE)/%.sorted: $(CACHE)/%.normalized
	$(SORT) < $< > $@
%/.dir:
	mkdir -p $*
	touch $@
$(DONTBUILD):;

clear-cache:
	$(RM) -fr $(CACHE)

cache-statistics: $(CACHE)/lbdb
	wc $(patsubst %,$(CACHE)/%.sorted,$(LISTS))
	wc $(CACHE)/lbdb

lbdb.sh

#!/bin/bash

# Wrapper (command line interface) for the lbdb.mk file.

prog=${0##*/}
makefile=${0%.sh}.mk
version=0.2
grep_options=( -i -a )

usage () {
  echo "$prog [-x] search terms"
  echo "$prog -h"
  echo "$prog -v"
}
help () {
  echo "Search the little brothers data base for a matching email address."
  echo "Options: -x for debugging, -h for help, -v for version."
  echo "Search terms are used by grep(1) in case insensitive mode."
}
grep_chain () {
  if [[ $# -eq 1 ]]; then
    grep "${grep_options[@]}" "$1"
  else
    local pattern=$1
    shift
    grep "${grep_options[@]}" "$pattern" | grep_chain "$@"
  fi
}

while getopts hvx FLAG; do
  case $FLAG in
    h) usage; echo; help; exit;;
    v) echo "$prog $version"; echo "Using $(grep --version|head -n 1)"; exit;;
    x) set -x;;
    *) usage >&2; exit 2;;
  esac
done

shift $((OPTIND - 1))

if [ $# -lt 1 ]; then
  usage >&2
  exit 2
fi

make --file "$makefile" --quiet
grep_chain "$@" < ~/.cache/lbdb/lbdb

I have since created a full blown repository: https://github.com/lucc/abq