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+#!/usr/bin/perl -w
+#
+# mutt-notmuch - notmuch (of a) helper for Mutt
+#
+# Copyright: © 2011 Stefano Zacchiroli <zack@upsilon.cc> 
+# License: GNU General Public License (GPL), version 3 or above
+#
+# See the bottom of this file for more documentation.
+# A manpage can be obtained by running "pod2man mutt-notmuch > mutt-notmuch.1"
+
+use strict;
+use warnings;
+
+use File::Path;
+use Getopt::Long;
+use Mail::Internet;
+use Mail::Box::Maildir;
+use Pod::Usage;
+
+
+# create an empty maildir (if missing) or empty an existing maildir"
+sub empty_maildir($) {
+    my ($maildir) = (@_);
+    rmtree($maildir) if (-d $maildir);
+    my $folder = new Mail::Box::Maildir(folder => $maildir,
+					create => 1);
+    $folder->close();
+}
+
+# search($maildir, $query)
+# search mails according to $query with notmuch; store results in $maildir
+sub search($$) {
+    my ($maildir, $query) = @_;
+
+    empty_maildir($maildir);
+    system("notmuch search --output=files $query"
+	   . " | sed -e 's: :\\\\ :g'"
+	   . " | xargs --no-run-if-empty ln -s -t $maildir/cur/");
+}
+
+sub search_action($$@) {
+    my ($interactive, $results_dir, @params) = @_;
+
+    if (! $interactive) {
+	search($results_dir, join(' ', @params));
+    } else {
+	my $query = "";
+	my $done = 0;
+	while (! $done) {
+	    print "search ('?' for man): ";
+	    chomp($query = <STDIN>);
+	    if ($query eq "?") {
+		system("man notmuch");
+	    } elsif ($query eq "") {
+		$done = 1;	# quit doing nothing
+	    } else {
+		search($results_dir, $query);
+		$done = 1;
+	    }
+	}
+    }
+}
+
+sub thread_action(@) {
+    my ($results_dir, @params) = @_;
+
+    my $mail = Mail::Internet->new(\*STDIN);
+    $mail->head->get('message-id') =~ /^<(.*)>$/;	# get message-id
+    my $mid = $1;
+    my $tid = `notmuch search --output=threads id:$mid`;# get thread id
+    chomp($tid);
+
+    search($results_dir, $tid);
+}
+
+sub die_usage() {
+    my %podflags = ( "verbose" => 1,
+		    "exitval" => 2 );
+    pod2usage(%podflags);
+}
+
+sub main() {
+    my $results_dir = "$ENV{HOME}/.cache/mutt_results";
+    my $interactive = 0;
+    my $help_needed = 0;
+
+    my $getopt = GetOptions(
+	"h|help" => \$help_needed,
+	"o|output-dir=s" => \$results_dir,
+	"p|prompt" => \$interactive);
+    if (! $getopt || $#ARGV < 0) { die_usage() };
+    my ($action, @params) = ($ARGV[0], @ARGV[1..$#ARGV]);
+
+    if ($help_needed) {
+	die_usage();
+    } elsif ($action eq "search" && $#ARGV == 0 && ! $interactive) {
+	print STDERR "Error: no search term provided\n\n";
+	die_usage();
+    } elsif ($action eq "search") {
+	search_action($interactive, $results_dir, @params);
+    } elsif ($action eq "thread") {
+	thread_action($results_dir, @params);
+    } else {
+	die_usage();
+    }
+}
+
+main();
+
+__END__
+
+=head1 NAME
+
+mutt-notmuch - notmuch (of a) helper for Mutt
+
+=head1 SYNOPSIS
+
+=over
+
+=item B<mutt-notmuch> [I<OPTION>]... search [I<SEARCH-TERM>]...
+
+=item B<mutt-notmuch> [I<OPTION>]... thread < I<MAIL>
+
+=back
+
+=head1 DESCRIPTION
+
+mutt-notmuch is a frontend to the notmuch mail indexer capable of populating
+maildir with search results.
+
+=head1 OPTIONS
+
+=over 4
+
+=item -o DIR
+
+=item --output-dir DIR
+
+Store search results as (symlink) messages under maildir DIR. Beware: DIR will
+be overwritten. (Default: F<~/.cache/mutt_results/>)
+
+=item -p
+
+=item --prompt
+
+Instead of using command line search terms, prompt the user for them (only for
+"search").
+
+=item -h
+
+=item --help
+
+Show usage information and exit.
+
+=back
+
+=head1 INTEGRATION WITH MUTT
+
+mutt-notmuch can be used to integrate notmuch with the Mutt mail user agent
+(unsurprisingly, given the name). To that end, you should define the following
+macros in your F<~/.muttrc> (replacing F<~/bin/mutt-notmuch> for the actual
+location of mutt-notmuch on your system):
+
+    macro index <F8> \
+          "<enter-command>unset wait_key<enter><shell-escape>~/bin/mutt-notmuch --prompt search<enter><change-folder-readonly>~/.cache/mutt_results<enter>" \
+          "search mail (using notmuch)"
+    macro index <F9> \
+          "<enter-command>unset wait_key<enter><pipe-message>~/bin/mutt-notmuch thread<enter><change-folder-readonly>~/.cache/mutt_results<enter><enter-command>set wait_key<enter>" \
+          "search and reconstruct owning thread (using notmuch)"
+
+The first macro (activated by <F8>) will prompt the user for notmuch search
+terms and then jump to a temporary maildir showing search results. The second
+macro (activated by <F9>) will reconstruct the thread corresponding to the
+current mail and show it as search results.
+
+To keep notmuch index current you should then periodically run C<notmuch
+new>. Depending on your local mail setup, you might want to do that via cron,
+as a hook triggered by mail retrieval, etc.
+
+=head1 SEE ALSO
+
+mutt(1), notmuch(1)
+
+=head1 AUTHOR
+
+Copyright: (C) 2011 Stefano Zacchiroli <zack@upsilon.cc>
+
+License: GNU General Public License (GPL), version 3 or higher
+
+=cut