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#!/usr/bin/perl -w
#
# AutoSearch
# Copyright (c) 1996-1997 University of Southern California.
# All rights reserved.
# $Id: AutoSearch,v 1.2 2010-12-02 23:46:30 Martin Exp $
#
# Complete copyright notice follows below.

=head1 NAME

AutoSearch -- a web-search tracking application

=head1 SYNOPSIS

AutoSearch [--stats] [--verbose] -n "Query Name" -s "query string" --engine engine [--mail you@where.com] [--options "opt=val"]... [--filter "filter"] [--host host] [--port port] [--userid bbunny --password c4rr0t5] [--ignore_channels KABC,KCBS,KNBC] qid

AutoSearch --VERSION
AutoSearch --help
AutoSearch --man

=cut

use Data::Dumper;  # for debugging
use Date::Manip;
use File::Copy;
use Getopt::Long qw( :config no_ignore_case );
# use LWP::Debug qw(+ ); # -conns);
use Pod::Usage;
use POSIX qw(strftime);
use WWW::Search;

use strict;

use vars qw( $VERSION );
$VERSION = do { my @r = (q$Revision: 1.2 $ =~ /\d+/g); sprintf "%d."."%03d" x $#r, @r };

use constant DEBUG_EMAIL => 0;

my $TESTONLY = 0;

sub print_version
  {
  print STDERR "$0 version $VERSION; WWW::Search version $WWW::Search::VERSION\n";
  } # print_version

my (%opts,@query_list,$query_name,$query_string,$search_engine,$query_options,$url_filter);
# Default options:
$opts{'m'} = '';
$opts{'cleanup'} = 0;
$opts{'cmdline'} = 0;
$opts{'emailfrom'} = '';
$opts{'v'} = 0;
$opts{'help'} = 0;
$opts{'man'} = 0;
$opts{'stats'} = 0;
$opts{'debug'} = 0;
$opts{'listnewurls'} = 0;
$opts{'ignore_channels'} = ();
&GetOptions(\%opts, qw(n|qn|queryname=s s|qs|querystring=s e|engine=s m|mail=s emailfrom=s host=s p|port=s o|options=s@ f|uf|urlfilter=s listnewurls stats userid=s password=s ignore_channels=s@ cleanup=i cmdline v|verbose help man V|VERSION debug),
            'http_proxy=s',
            'http_proxy_user=s',
            'http_proxy_pwd=s',
           ) or pod2usage(2);
if ($opts{'V'})
  {
  &print_version();
  exit 0;
  } # if
&pod2usage(1) if ($opts{'help'});
&pod2usage(
           -verbose => 2,
          ) if ($opts{'man'});
&pod2usage(
           -verbose => 0,
           -exitval => 1,
           -message => 'missing argument "qid"',
          ) if ($#ARGV == -1);

my $s_dbg = $opts{'stats'};
my $v_dbg = $opts{'v'};
my $d_dbg = $opts{'debug'} || $v_dbg;
if ($v_dbg)
  {
  print STDERR "v     option: defined\n";
  print STDERR "stats option: ", ! $opts{'stats'} ? 'not ' : '', "defined\n";
  print STDERR "debug option: ", ! $opts{'debug'} ? 'not ' : '', "defined\n";
  } # if
sub module_loaded
  {
  my $sModule = shift;
  eval "use $sModule";
  return ($@ eq '');
  } # module_loaded
if ($opts{'m'} ne '')
  {
 MODULE:
  foreach my $sMod (qw( Email::MIME Email::MIME::Creator Email::Send Email::Send::Sendmail Email::Send::Qmail Email::Send::SMTP ))
    {
    if (! &module_loaded($sMod))
      {
      print STDERR " --- can not load $sMod module: ==$@==\n";
      $opts{'m'} = '';
      last MODULE;
      } # if
    else
      {
      # print STDERR " + loaded $sMod\n";
      }
    } # foreach MODULE
  } # if
print STDERR "will send email summary to: ", $opts{'m'}, "\n" if ($v_dbg && ($opts{'m'} ne ''));

# if we want a list of args:
#@query_list = split(/[,\s]+/, $opts{'n'},2) if defined($opts{'n'});

$query_name =    $opts{'n'} || '';
$query_string =  $opts{'s'} || '';
$search_engine = $opts{'e'} || '';
if (defined($opts{'o'}))
  {
  $query_options = {};
  foreach my $sPair (@{$opts{'o'}})
    {
    my ($key, $value) = $sPair =~ m/^([^=]+)=(.*)$/;
    &add_to_hash($key, &WWW::Search::escape_query($value), $query_options);
    } # foreach
  } # if
$url_filter =    $opts{'f'} if defined($opts{'f'});
my($local_filter) = 0; # shall we exclude our own old pages? (1=y,0=n)

#print STDERR "n = \"$opts{'n'}\"\n" if defined($opts{'n'});
#print STDERR "s = \"$opts{'s'}\"\n" if defined($opts{'s'});
#print STDERR "e = \"$opts{'e'}\"\n" if defined($opts{'e'});
#print STDERR "o = \"$opts{'o'}\"\n" if defined($opts{'o'});
#print STDERR "f = \"$opts{'f'}\"\n" if defined($opts{'f'});

##print STDERR "query_list   = \"$query_list[0]\" \"$query_list[1]\"\n";
#print STDERR "query_name    = \"$query_name\"\n";
#print STDERR "query_string  = \"$query_string\"\n";
#print STDERR "search_engine = \"$search_engine\"\n";
#print STDERR "url_filter    = \"$url_filter\"\n"    if defined($opts{'f'});

&main(join(" ", @ARGV));

exit 0;

########
# subs #
########
#
# all the subroutine documentation has been disabled  -- oh for a ifdef
# someday -- put all the subs in another file & tech documentation
# from there, man page from main file.  wls :) 10/18/96 :(
#
#=head1 SUBROUTINES
#
#=cut
#
# Files expected first_date.html and first_index.html in the
# 'home' directory.  These are used to build the initial
# search files.
#
# To start a new search: specify a query name (-qn) and
# query string (-qs) (and more). If either are not provided, AS will
# ask the user (STDIN) for the name and/or the string as necessary.
# The string "AutoSearch WEB Searching" is replaced by the query name
# and the string "ask user" is replaced by the query string.
#
# AS 1.x accepts the basic query sub-directory identifier
# and looks to see if qid/date.html exists.  If this file
# file does not exist, AS looks for a file first_date.html
# If the default file in the parent directory is missing, AS
# creates a default-default file named qid/date.html.
# In any case the directory 'qid' is created.
# A second file first_index.html is used to create the initial
# qid/index.html file in a like fashon.
#
# (LATER: ADD SEARCH ENGINE(S))
# There are three important items which must be defined for any
# search that AS will process.  First the query-subdirectory
# identifier (qid).  This is the handle to this query.
# Once a query session is established; only the qid need be
# specified on the command line.
# Second is the 'pretty name' that you will assign to this
# Query.  This is used at the top of the screens to help
# the user identify what the searche topic is.  Third
# is the actual search string.  This is passed directly to
# search processor, and the search engine.
#
# File date.html is used to define the format of the pages which are
# created each time (weekly) AutoSearch.pl is run.  Major sections of
# the file are identified with html comments.  The search string is
# embedded in this file too.  One method of creating a new search is
# to create the new directory manually and create a file named
# date.html in the sub-directory.  However; this requires you to
# understand the tags and build a file which is compatible with AS.
#
# A second method is to manually copy first_date.html to qid/date.html
# and edit it.  This is the John method to introduce a new search.  It
# is cumbersome and not-automated-ish.
#
# A third approach involves using command line arguments to specify
# the query name and string.  This is the wls method.  One variation
# on the wls method is the "ask user" method.  In this approach, AS
# will ask the user for the required items.  In both of these methods
# the necessary files will be created.
#
# Once the initial search has been made and the files created, then
# the simple command "AutoSearch qid" will update the search files and
# pages.
#
#=head1 NAME
#
#main -  start of actual work.
#
#
#=head1 DESCRIPTION
#
#Submit a search and build output files.
#
#=cut

# submit a search and optionally build output file(s).
#
sub main
  {
  my ($query_dir) = @_;
  my $dbg_search = $d_dbg || 0;
  my $v_dbg = $v_dbg; # shall we be verbose??
  my $sEmail = '';
  my $url_filter_count = 0;
  # get the date.
  my $now = &time_now;
  my $today = &time_today;
  print STDERR "Now = ", $now if $v_dbg;
  print STDERR ", Today = ", $today, "\n" if $v_dbg;
  # Build query directory string:
  my $qid = $query_dir;
  die ("qid is a required argument.") unless ($qid);
  die ("qid is a required argument.") unless ($qid =~ m!\S!);
  print STDERR "query directory: $qid\n" if $v_dbg;
  # Do we have the necessary infrastructure?  We require two files: 1)
  # the summary of searches and 2) weekly updates.  Look for
  # index.html, or default first_index.html, or make one from scratch.
  # index.html contains the previous search results. (aka old summary)
  &check_index_file($qid); # make qid/index.html
  $v_dbg && print STDERR " + found/created $qid/index.html\n";
  if ($opts{'cmdline'})
    {
    # Show the original cmdline and exit:
    my %hssOptions = (
                      Query => '--querystring',
                      QueryName => '--queryname',
                      SearchEngine => '--engine',
                      URLFilter => '--filter',
                      QueryOptions => '--option',
                      # IgnoreChannels => '--ignore_channels',
                     );
    my $sFile = qq{$qid/index.html};
    open(INDEX, $sFile) or die " --- can not open $sFile for read: $!";
    # Slurp entire file:
    local $/ = undef;
    my $sHTML = <INDEX>;
    close(INDEX) or warn " --- can not close $sFile after reading: $!";
    my $sCmdline = qq{$0 $qid };
    # Special case: look for QueryName inside <h1> tags:
    $sHTML =~ s#<h1>(.+?)</h1>#<!--QueryName\{$1}/QueryName-->#;
    while (my ($sTag, $sArg) = each %hssOptions)
      {
      while ($sHTML =~ m#<!--$sTag\{(.*?)}/$sTag-->#g)
        {
        my $sValue = $1 || '';
        $sCmdline .= qq{$sArg "$sValue" } if ($sValue ne '');
        } # while
      } # while
    print STDERR "\n$sCmdline\n";
    return;
    } # if --cmdline

  my $iCleanup = $opts{'cleanup'};
  if (0 < $iCleanup)
    {
    print STDERR " + doing cleanup $iCleanup in ==$qid==\n" if $opts{debug};
    # We don't care what the timezone is, we only deal with days:
    &Date_Init('TZ=US/Eastern');
    my $dateCutoff = &DateCalc('today', " - $iCleanup days");
    my $sCutoff = &UnixDate($dateCutoff, '%Y%m%d');
    print STDERR " +   cutoff date is ==$sCutoff==\n" if $opts{debug};
    opendir(DIR, $qid) or die(" --- can not read directory $qid: $!");
 CLEANUP_FILE:
    while (my $sFile = readdir(DIR))
      {
      next CLEANUP_FILE if $sFile eq '.';
      next CLEANUP_FILE if $sFile eq '..';
      print STDERR " +   found file ==$sFile==\n" if $opts{debug};
      if ($sFile lt $sCutoff)
        {
        print STDERR " +     unlink ==$sFile==\n" if $opts{debug};
        unlink qq{$qid/$sFile} or warn $!;
        } # if file is old
      } # while
    closedir DIR;
    # Now delete old lines from index.html:
    my $sFile = qq{$qid/index.html};
    my $sFileNew = qq{$sFile.new};
    open(INDEX, $sFile) or die " --- can not open $sFile for read: $!";
    open(NEW, '>'. $sFileNew) or die " --- can not open $sFileNew for write: $!";
    local $/ = "\n";
 CLEANUP_LINE:
    while (my $sLine = <INDEX>)
      {
      if ($sLine =~ m!search on ([A-Za-z]+ \d+, \d+)!)
        {
        # This line contains a date.
        my $date = &ParseDate($1);
        my $iCmp = &Date_Cmp($date, $dateCutoff);
        if ($iCmp < 0)
          {
          # This line's date is before the cutoff.
          print STDERR " + delete line $sLine" if $opts{debug};
          next CLEANUP_LINE;
          } # if
        } # if
      print NEW $sLine;
      } # while
    close INDEX;
    close NEW;
    copy($sFileNew, $sFile) or die " --- can not copy $sFileNew to $sFile: $!";
    unlink $sFileNew;  # No big deal if this fails
    # All done:
    return;
    } # if --cleanup

  $qid .= '/' unless substr($qid,-1,1) eq '/'; # we MUST have a /
  # Read index.html and break into fields.
  my ($SummaryTop, $SummaryQuery,
      $SummarySearchEngine, $SummaryURLFilter,
      $SummaryHeading, $SummaryTemplate, $Summary,
      $WeeklyHeading, $WeeklyTemplate, $Weekly,
      $SummaryBottom, @SummaryQueryOptions) = &get_summary_parts($qid);
  $v_dbg && print STDERR " + got summary parts...\n";
  # Split the old summary into a list. (later sort it)
  my ($url, $description, $title);
  my (@old_summary_url,@old_summary_title);
  my @old_summary = split(/\n/,$Summary);
  my ($line);
  my ($i, $n, $j, $m);
  # Break each hyperlink into its url and title.
  for my $i (0..$#old_summary)
    {
    # $old_summary -> $url & $title
    $line = $old_summary[$i];
    if ($line =~ m#<a href="(.*)">(.*)</a><br>#i)
      {
      $url = $1;
      $title = $2;
      push (@old_summary_url,$url);
      push (@old_summary_title,$title);
      } # if
    } # for

# For each item in weekly list:
#   If it is in old summary list remove it, else leave it.
#  Hint: note alphabetical order to reduce searching.
# Append weekly list to summary list. Sort it.
# Use summary list to build a new summary.
# Output first half of the NEW index.html page. (summary)
# Append either "no new results" (if zero unique left in weekly list)
# or the date to weekly results list.
# Output second half of NEW index.html page. (weekly results)
#
# If non-zero, use weekly list to build weekly file.

# These are the input params to autosearch:
# 1) qid, 2) query name, 3) query string, 4) search engine,
# 5) query options, and 6) url filter RE.
# Dispose of input params as follows:
# Insert the Query Name into 'Top' for  index.html & date.html,
# Insert the Query String, Search Engine, and URL Filter into
# the 'HTML fields' from index.html
# Precedence of input: Query Name (pretty name) and Query String (search engine)
# Search Engine (AltaVista), Search Options (## need example ##),
# URL Filter (to suppress display and tracking of particular URLs)
# 1) from existing file or default files (files already in place), or
# 2) from user.
#    (either a) command line or b) "ask user" (or error if we don't dare))
  my ($QueryName, $QueryString, $SearchEngine, $URLFilter);
  $QueryName = $query_name;
# did we get a Query Name/String/Engine/Options/Filter from existing files?
  if ($SummaryTop =~ m/AutoSearch WEB Searching/i)
    {
    if ($query_name eq '')
      {
      # We did not get --queryname from command line
      $QueryName = &read_query("Please enter a Query Name:");
      } # if
    $SummaryTop =~ s/AutoSearch WEB Searching/$QueryName/i;
    } # if
  print STDERR "Query Name is \"$QueryName\"\n" if $v_dbg;

  if ($SummaryQuery =~ m/ask user/i)
    {
    if ($query_string ne '')
      {
      # We did get --querystring from command line
      $QueryString = $query_string;
      }
    else
      {
      # We did NOT get --querystring, ask the user:
      $QueryString = &read_query("Please enter a Query String:");
      }
    $SummaryQuery =~ s/ask user/$QueryString/i;
    print STDERR "Query String is \"$QueryString\"\n" if $v_dbg;
    } # if
  my $sTitle = "<Title> Search results for $SummaryQuery as of $now </Title>\n";

  # This is not a required field.
  # This MUST BE 'ask user' to get AutoSearch to ask.
  if ($SummarySearchEngine =~ m/ask user/i)
    {
    if ($search_engine ne '')
      {
      # We DID get --engine on command line:
      $SearchEngine = $search_engine;
      }
    else
      {
      # We did NOT get --engine, ask user:
      $SearchEngine = &read_query("Please enter a Search Engine:");
      }
    $SummarySearchEngine =~ s/ask user/$SearchEngine/i;
    }
  else
    {
    # don't ask; try command line:
    if ($search_engine ne '')
      {
      # We DID get --engine on command line:
      $SearchEngine = $search_engine;
      }
    else
      {
      # No --engine on command line, no Search Engine in index file.
      # Use whatever was in the first_index.html file
      $SearchEngine = $SummarySearchEngine;
      }
    $SummarySearchEngine = $SearchEngine;
    }
  print STDERR "Search Engine is \"$SearchEngine\"\n" if $v_dbg;

# This is not a required field.
# This MUST BE 'ask user' to get AutoSearch to ask.
#
#  print $SummaryQueryOptions[0], " v. ask user\n";
  if ($SummaryQueryOptions[0] =~ m/ask user/i) { # either ask or use command line
#    print $SummaryQueryOptions[0], " is ask user\n";
    if (defined($opts{'o'})) { # from command line ?
#      print STDERR "defined.\n";
      # use $query_options
    } else { # no, ask 'em
#      print STDERR "not defined.\n";
      @SummaryQueryOptions = &read_query_list("Please enter Query Options:");
      $query_options = {};
      foreach (@SummaryQueryOptions) {
        next if m/^$/;
        my($key, $value) = m/^([^=]+)=(.*)$/;
#        print STDERR "option:$_ is $key=$value\n";
        &add_to_hash($key, &WWW::Search::escape_query($value), $query_options);
      }
    }
  } else { # or use what came from index.html file
    $query_options = {};
    foreach (@SummaryQueryOptions) {
      next if m/^$/;
      my($key, $value) = m/^([^=]+)=(.*)$/;
      # print STDERR "option:$_ is $key=$value\n";
      &add_to_hash($key, &WWW::Search::escape_query($value), $query_options);
    }
  }

# this is not a required field.
# this MUST BE ask user to get AutoSearch to ask.
  if ($SummaryURLFilter =~ m/ask user/i) { # no, shall we ask the user
    if (defined($url_filter)) { # from command line ?
      $URLFilter = $url_filter;
    } else { # no, ask 'em
      $URLFilter = &read_query("Please enter a URL Filter:");
    }
    $SummaryURLFilter =~ s/ask user/$URLFilter/i;
  } else { # don't ask; try command line
    if (defined($url_filter)) { # from command line ?
      $URLFilter = $url_filter; # yes
    } else { # if no comamnd line, no filter!!
      $URLFilter = $SummaryURLFilter; # use whatever was in the first_index.html file
    }
    $SummaryURLFilter = $URLFilter;
  }
  if ($s_dbg)
    {
    print STDERR qq{Query is : "$SummaryQuery"};
    print STDERR qq{ with "@SummaryQueryOptions"} if ($#SummaryQueryOptions);
    print STDERR "\n";
    } # if
  print STDERR "URL Filter is \"$URLFilter\"\n" if $v_dbg;
#
# now locate the weekly format file.
# 1) qid/date.html, or 2) first_date.html, or 3) create one.
  &check_date_file($qid,$QueryName,$QueryString); #make qid/date.html

# read date.html and break into fields.
# make the search results into a list of urls, title, & descr).
# (later sort it)
# note: Top & Bottom CAN BE different from index.html.
  my($WeeklyTop,
     $AppendedHeading,$AppendedTemplate,$Appended,
     $SuspendedHeading,$SuspendedTemplate,$Suspended,
     $WeeklyBottom)
   = &get_weekly_parts($qid);
# insert queryname into html Top from date.html
# usually this is not set up, because when we created the file we didn't
# have the data.  Do we have the Query Name?
  $WeeklyTop =~ s/>AutoSearch WEB Searching</$QueryName/;
  $v_dbg && print STDERR " + got weekly parts...\n";

  my $hits = 0; # actual no. of hits.
  my $saved = 0; # actual no. saved.
  my $search;
  # Search AltaVista, or whatever the user has specified.
  if($SummarySearchEngine) {
    $search = new WWW::Search($SummarySearchEngine);
  } else {
    $search = new WWW::Search(undef()); # must be undef to get default.
  }
  $search->{_host} = $opts{'h'} if defined($opts{'h'});
  $search->{_port} = $opts{'p'} if defined($opts{'p'});
  if (defined($opts{'http_proxy'}) && ($opts{'http_proxy'} ne ''))
    {
    print STDERR qq{ + applying http_proxy }, Dumper(\$opts{http_proxy}) if $opts{'debug'};
    $search->http_proxy(['http', ] => $opts{'http_proxy'});
    if (defined($opts{'http_proxy_user'}) && ($opts{'http_proxy_user'} ne ''))
      {
      print STDERR qq{ + applying $opts{http_proxy_user}...\n} if $opts{'debug'};
      $search->http_proxy_user($opts{'http_proxy_user'});
      $search->http_proxy_pwd($opts{'http_proxy_pwd'});
      } # if
    } # if
  elsif ($opts{'env_proxy'})
    {
    $search->env_proxy($opts{'env_proxy'});
    }
  elsif (0)
    {
    # This is the OLD code:
    $search->http_proxy($ENV{'HTTP_PROXY'}) if ($ENV{'HTTP_PROXY'});
    $search->http_proxy($ENV{'http_proxy'}) if ($ENV{'http_proxy'});
    } # if
  # submit search w/options.
  $search->native_query(WWW::Search::escape_query($SummaryQuery), $query_options);
  $search->login($opts{'userid'}, $opts{'password'});
  # Process the --ignore_channels argument(s):
  my @asChannel;
  foreach my $sChannel (@{$opts{'ignore_channels'}})
    {
    push @asChannel, split(/,/, $sChannel);
    } # foreach
  if ($search->can('ignore_channels')
      &&
      scalar(@asChannel)
     )
    {
    $search->ignore_channels(@asChannel);
    } # if
  # examine search results
  my($next_result);
  my(@new_weekly_url,@new_weekly_title,@new_weekly_description);
  my @aoResult;  # Parallel array to new_weekly_url
  my(@weekly_url,@weekly_title);

# care to see the old summary list?
#  print STDERR "old summary:\n";
#  foreach $line (@old_summary_url) {
#    print STDERR "$line\n";
#  }

  # how many hits?
  # convert latest search results to a list of urls (descriptions & titles)
  # filtered by $SummaryURLFilter called new_weekly_*
 NEXT_URL:
  while ($next_result = $search->next_result()) { # page-by-page
    $url = $next_result->url;
    $hits++; # how many were returned?
    if ($local_filter) { # exclude old pages from prev. version?
      # let's not display references to our own pages.
      next if $url =~ m,www\.isi\.edu/div7/ib/(.+)/(\d+)\.html$,o;
      # let's not display references to our old pages.
      next if $url =~ m,www\.isi\.edu/div7/ib/jog,o;
    }
    # let the user filter out URLs.
    if ( ($SummaryURLFilter) && ($url =~ m,$SummaryURLFilter,oi) ) {
#      print STDERR "filter out $url \n with filter: $SummaryURLFilter\n";
      $url_filter_count++;
      next;
    }
    $saved++; # how many were saved?
    push(@weekly_url,$url); # the complete set of hits
    $title = $next_result->title;
    push(@weekly_title,$title);
    # Was it in the old summary?  If so, don't save it.
    # If not, it is a new search results for this week.
    foreach $line (@old_summary_url)
      {
      # See if this url is in the summary; skip this url if it's in
      # the summary:
      next NEXT_URL if ($url eq $line);
      } # foreach
    print STDERR "url:$url ** new result **\n" if $dbg_search;
    print "$url\n" if $opts{'listnewurls'};
    $description = $next_result->description;
    print STDERR "description: ", $description, "\n" if $dbg_search;
    print STDERR "title: ", $title, "\n" if $dbg_search;
    push(@new_weekly_url,$url); # the newest set of hits (added)
    push(@new_weekly_description,$description);
    push(@new_weekly_title,$title);
    push @aoResult, $next_result;
  } # while NEXT_URL
  # Report errors, if any:
  my $response = $search->response();
  if ($response->is_success)
    {
    if ($hits == 0)
      {
      print STDERR "Warning:  Empty results set.\n" if ($v_dbg);
      } # if no hits
    } # if HTTP success
  else
    {
    my $sMsg = "Error: " . http_error_as_nice_string($response);
    print STDERR "$sMsg\n";
    $sEmail .= "$sMsg\n";
    } # else HTTP error

  # Only save the ones that don't show up in the current query list.
  # Those we shall call suspended_*
  my (@suspended_url,@suspended_title);
  # We must use a for loop, to get the urls to match their descr &
  # title.
  OLD_URL:
  for my $i (0..$#old_summary_url)
    {
    $url = $old_summary_url[$i];
    for my $j (0..$#weekly_url)
      {
      $line = $weekly_url[$j];
      # if we match the weekly (active search) hits, skip it.
      next OLD_URL if $url eq $line;
      } # for $j
    printf STDERR "suspend: [%02d]%s\n",$i,$url if $dbg_search;
    # not found? save it, it's been suspended
    push(@suspended_url,$url);
    $title = $old_summary_title[$i];
    push(@suspended_title,$title);
    } # for $i
  # stats?? (to see 'em use -stats)
  print STDERR "old summary count: ",$#old_summary_url + 1,"\n" if ($s_dbg);
  print STDERR "new raw hits     : ",$hits,"\n" if ($s_dbg);
  print STDERR "urls filtered    : ",$url_filter_count,", filter \"",$URLFilter,"\"\n" if ($s_dbg);
  print STDERR "not filtered     : ",$saved,"\n" if ($s_dbg);
  print STDERR "results set count: ",$#new_weekly_url + 1,"\n" if ($s_dbg);
  print STDERR "suspended count  : ",$#suspended_url + 1,"\n" if ($s_dbg);
  print STDERR "final count      : ",$#weekly_url + 1,"\n" if ($s_dbg);
  my $changes = (($#new_weekly_url != -1) || ($#suspended_url != -1));
#  printf STDERR "changes is %d\n",$changes if ($v_dbg);

# For every search, AutoSearch (aka AS) will make a 'weekly' file.
# Usually AutoSearch is run as a 'cron' job; but can be run manually.
# AS will attempt to handle multiple (non-concurrent) runs per day.
  my $file = (&time_file_of_the_day_numeric).'.html';
  my $section;
  my $junk;
# to test this 'diff' code 1) rm -r qid/* 2) run AS -stats qid -qn -qs
# 3) edit qid/index.html remove some, add some (new urls)
# 4) run AS -stats qid; look at <today>.html
# you will see 'deleted' (from above) as 'recently added' &
# 'added' (from above) as 'recently suspended'
# reason: the changes were forced in 'old summary',
# usually (normal, non-testing cases) the changes will appear in new_weekly_*
# now if this is a run that adds information (re) write the file.
#
# do we have a reason to care? New Results, Appensions, Suspensions???
  my $iNewResultCount = 0;
  if ($changes)
    {
    # print STDERR "test file: $qid$file\n";
    if (-e $qid.$file)
      {
      # File already exists; modify it.
      print STDERR "modify existing weekly file.\n" if ($v_dbg);
      # Copy in previous file from today:
      open (PARTS,'<'.$qid.$file) || die "Can't open weekly input file.\nReason: $!\n";
      my($part) = <PARTS>;
      close (PARTS);
      #      print STDERR "Part:\"$part\"\n";
      # break into parts to insert modifications
      my($part1,$part2) = split (/<!--\/Appended-->/,$part,2);
      my($part3,$part4) = split (/<!--\/Suspended-->/,$part2,2);
      # write back out w/ changes.
      open (HTML,'>'.$qid.$file) || die "Can't open weekly output file.\nReason: $!\n";
      print HTML $part1;
      $n = $#new_weekly_url + 1;
      if ($n) {
        print HTML "<!--more...-->\n";
        print HTML "<h4>Recently Added:</h4><p>\n";
        }
      # format each unique result.
      for ($i=0; $i < $n; $i++) {
        $url = $new_weekly_url[$i];
        $title = $new_weekly_title[$i];
        $description = $new_weekly_description[$i];
        my $sHTMLlink = &make_link($AppendedTemplate, $url, $title, $description);
        print HTML "$sHTMLlink\n";
        # print STDERR " DDD search is $search\n";
        $sEmail .= q{<P>}. $search->result_as_HTML($aoResult[$i], '%Y-%m-%d %H:%M %Z');
        } # for
      print HTML "<!--/Appended-->"; # replace due to split
      print HTML $part3;
      $n = $#suspended_url + 1;
      if ($n) {
        print HTML "<!--less...-->\n";
        print HTML "<h4>Recently Suspended:</h4><p>\n";
        }
      # format each suspended result.
      for ($i=0; $i < $n; $i++) {
        $url = $suspended_url[$i];
        $title = $suspended_title[$i];
        print HTML &make_link($SuspendedTemplate,$url,$title,""),"\n";
        }
      print HTML "<!--/Suspended-->"; # replace due to split
      print HTML $part4;
      close (HTML);
      }
    else
      { # create the file
      #      print STDERR "make new weekly file.\n" if ($v_dbg);
      open (HTML,'>'.$qid.$file) || die "Can't open weekly output file.\nReason: $!\n";
      print HTML $sTitle;
      print HTML "<!-- created by AutoSearch.pl by wls -->\n";
      print HTML "<!--Top-->\n$WeeklyTop<!--/Top-->\n";
      DEBUG_EMAIL && print STDERR " + start creating email, new_weekly_url is ", Dumper(\@new_weekly_url);
      # Output weekly search status: appended
      $iNewResultCount = $#new_weekly_url + 1;
      # Always do the header:
      print HTML "<!--AppendedHeading\n$AppendedHeading/AppendedHeading-->\n";
      print HTML &format_link($AppendedHeading,"DATE", $now) if $iNewResultCount;
      print HTML "<!--AppendedTemplate\n$AppendedTemplate/AppendedTemplate-->\n";
      $section = "Appended"; # the section of the file/output.
      print HTML "<!--$section-->\n";
      # Format each unique result:
      for my $i (0..$iNewResultCount-1)
        {
        $url = $new_weekly_url[$i];
        $title = $new_weekly_title[$i];
        $description = $new_weekly_description[$i];
        my $sHTMLlink = &make_link($AppendedTemplate, $url, $title, $description);
        print HTML "$sHTMLlink\n";
        $sEmail .= q{<P>}. $search->result_as_HTML($aoResult[$i], '%Y-%m-%d %H:%M %Z');
        } # for $i
      print HTML $Appended;
      print HTML "<!--/$section-->\n\n";

      # output weekly search status: suspended
      $n = $#suspended_url + 1;
      # always do the heading
      print HTML "<!--SuspendedHeading\n$SuspendedHeading/SuspendedHeading-->\n";
      print HTML &format_link($SuspendedHeading,"DATE","$now") if $n;
      print HTML "<!--SuspendedTemplate\n$SuspendedTemplate/SuspendedTemplate-->\n";
      $section = "Suspended"; # the section of the file/output.
      print HTML "<!--$section-->\n";
      for ($i=0; $i < $n; $i++) {
        $url = $suspended_url[$i];
        $title = $suspended_title[$i];
        print HTML &make_link($SuspendedTemplate,$url,$title,""),"\n";
      } # for $i
      print HTML $Suspended;
      print HTML "<!--/$section-->\n\n";
      print HTML "<!--Bottom-->\n$WeeklyBottom<!--/Bottom-->\n";
      close (HTML);
    } # else daily file doesn't exist
  } # if any new hits
  else
    {
    print STDERR "no weekly changes required.\n" if ($v_dbg);
  }
  $QueryName = $SummaryQuery if ($QueryName eq '');
  # Now write the new index file.
  # Create the index.html output file:
  open (HTML,'>'.$qid.'index.html') || die "Can't open summary output file.\nReason: $!\n";
  print HTML "<Title> Summary of Search results for $SummaryQuery</Title>\n";
  print HTML "<!-- created by AutoSearch.pl by wls -->\n";
  print HTML "<!--Top-->\n$SummaryTop<!--/Top-->\n";
  print HTML "<!--Query{$SummaryQuery}/Query-->\n";
  print HTML "<!--QueryName{$QueryName}/QueryName-->\n";
  print HTML "<!--SearchEngine{$SummarySearchEngine}/SearchEngine-->\n" if ($SummarySearchEngine);
  print HTML "<!--URLFilter{$SummaryURLFilter}/URLFilter-->\n" if ($SummaryURLFilter);
  foreach my $key (keys (%{$query_options})) {
#    print STDERR "option::$key=$query_options->{$key}\n";
    print HTML "<!--QueryOptions{$key\=$query_options->{$key}\}QueryOptions-->\n";
  }
# output summary of updated unique findings
  print HTML "<!--SummaryHeading\n$SummaryHeading/SummaryHeading-->\n";
  print HTML &format_link($SummaryHeading, "DATE", $now);
  print HTML "<!--SummaryTemplate\n$SummaryTemplate/SummaryTemplate-->\n";
  $section = "Summary"; # the section of the file/output.
  print HTML "<!--$section-->\n";
  if ($#new_weekly_url < 0) { # it has't changed; just re-cycle it.
    print HTML $Summary;
  } else {
#   format each unique result.
#    $description = "";
    $n = $#weekly_url + 1;
    for ($i=0; $i < $n; $i++) {
      $url = $weekly_url[$i];
      $title = $weekly_title[$i];
      print HTML &make_link($SummaryTemplate,$url,$title,""),"\n";
    }
  }
  # Output daily results status (none or ptr to new file).
  print HTML "<!--/$section-->\n\n";
  print HTML "<!--WeeklyHeading\n$WeeklyHeading/WeeklyHeading-->\n";
  print HTML &format_link($WeeklyHeading,"DATE", $now);
  print HTML "<!--WeeklyTemplate\n$WeeklyTemplate/WeeklyTemplate-->\n";
  $section = "Weekly"; # the section of the file/output.
  print HTML "<!--$section-->\n";
  # report errors FIRST.
  if ($hits == 0)
    {
    my($response) = $search->response();
    if ($response->is_success)
      { # dbg message, normally we're quiet
      #      print HTML "AutoSearch Warning: Empty Results Set. <br>\n";
      }
    else
      { # SearchEngine error message:
      my $sMsg = "AutoSearch Error during search on $today: " . http_error_as_nice_string($response);
      print HTML "$sMsg<br>\n";
      $sEmail .= "$sMsg\n";
      }
    } # if no hits
  # Let's use reverse chronological order.
  # Update the 'weekly' status:
  if ($changes)
    { # there were changes.
    # second run today?
    if ($Weekly =~ m/^No unique results found for(.*)$today/i)
      {
      #      print STDERR "change 'No' to 'Yes'\n";
      # The first line SHOULD be today's, assume so.
      # Delete first line of $Weekly and write new link:
      ($junk, $Weekly) = split (/\n/,$Weekly,2); # split off first line
      print HTML "Web search results for <a href=\"$file\">search on ",$today,"</a><br>\n";
      }
    elsif ($Weekly =~ m/^AutoSearch Error during search on $today/i)
      {
      #      print STDERR "change 'Error' to 'Yes'\n";
      # The first line SHOULD be today's, assume so.
      # Delete first line of $Weekly and write new link:
      ($junk, $Weekly) = split(/\n/, $Weekly, 2); # split off first line
      print HTML "Web search results for <a href=\"$file\">search on ",$today,"</a><br>\n";
      }
    elsif ($Weekly =~ m/^Web search results for(.*)$today/)
      { # yes we already have a link, leave it.
      #      print STDERR "leave 'Yes'\n";
      }
    else
      { # no link for today of any kind. add one.
      #      print STDERR "insert 'Yes'\n";
      print HTML "Web search results for <a href=\"$file\">search on ",$today,"</a><br>\n"; 
      }
    } # there were any $changes
  else
    {
    # second run today?
    if ($Weekly =~ m/^No unique results found for(.*)$today/i)
      {
      # print STDERR "leave 'No'\n";
      }
    elsif ($Weekly =~ m/^AutoSearch Error during search on $today/i)
      {
      #      print STDERR "change 'Error' to 'No'\n";
      # The first line SHOULD be today's, assume so.
      # Delete first line of $Weekly and write new link:
      ($junk, $Weekly) = split(/\n/, $Weekly, 2); # split off first line
      print HTML "No unique results found for search on ",$today,"<br>\n";
      }
    elsif ($Weekly =~ m/^Web search results for(.*)$today/)
      { # We found results earlier today, leave them.
      # print STDERR "leave 'Yes'\n";
      }
    else
      {
      # print STDERR "insert 'No'\n";
      print HTML "No unique results found for search on ",$today,"<br>\n";
      }
    } # there were no $changes
  print HTML $Weekly;
  print HTML "<!--/$section-->\n\n";

  print HTML "<!--Bottom-->\n$SummaryBottom<!--/Bottom-->\n";
  close (HTML);

  # DEBUG_EMAIL && print STDERR " +   opts{m} =$opts{m}=\n";
  # DEBUG_EMAIL && print " +   raw sEmail =====$sEmail=====\n";
  if (($opts{'m'} ne '') && ($sEmail ne ''))
    {
    $sEmail = <<"EMAILEND";
<HTML>
<HEAD>$sTitle</HEAD>
<BODY>
<h2>The following $iNewResultCount URLs are new matches for your $SummarySearchEngine query '$SummaryQuery':</h2>
$sEmail
</BODY></HTML>
EMAILEND
    # DEBUG_EMAIL && print STDERR " +   cooked sEmail =====$sEmail=====\n";
    # DEBUG_EMAIL && exit 88;
    my $sSubject = "Results of AutoSearch query '$SummaryQuery'";
    my $sFrom = 'AutoSearch@localhost';
    $sFrom = $opts{emailfrom} if ($opts{emailfrom} ne '');
    my $oMsg = Email::MIME->create(
                                   header => [
                                              To => $opts{'m'},
                                              Subject => $sSubject,
                                              From => $sFrom,
                                             ],
                                   attributes => {
                                                 'content_type' => 'text/html',
                                                },
                                   body => $sEmail,
                                  );
    DEBUG_EMAIL && print STDERR " + oMsg is ", Dumper($oMsg);
    if (ref($oMsg))
      {
      DEBUG_EMAIL && print STDERR " + oMsg in sendable format is:\n";
      DEBUG_EMAIL && Email::Send::send(IO => $oMsg);
      my $sRes = &send_email($oMsg);
      print STDERR "result of send_email() is ==$sRes=\n" if ($v_dbg || ($sRes ne '1'));
      # print STDERR $sRes if ($v_dbg || ($sRes ne '1'));
      }
    else
      {
      print STDERR " --- could not create Email::MIME object\n";
      }
    } # if
  } # main

sub send_email
  {
  my $oMessage = shift;
  my $sSMTPserver = $ENV{SMTPSERVER} || shift || '';
  if ($sSMTPserver ne '')
    {
    my $sUsername = $ENV{SMTPUSERNAME} || shift || '';
    my $sPassword = $ENV{SMTPPASSWORD} || shift || '';
    if ($TESTONLY)
      {
      $sUsername = '<empty>' if ($sUsername eq '');
      $sPassword = ($sPassword eq '') ? '<empty>' : '<hidden>';
      return qq{$0 chose method SMTP::Auth with server=$sSMTPserver, username=$sUsername, password=$sPassword};
      } # if
    return Email::Send::SMTP->send($oMessage,
                                   Host => $sSMTPserver,
                                   username => $sUsername,
                                   password => $sPassword,
                                  );
    } # if SMTP
  if (
      # User has customized the pointer to the qmail program:
      ($Email::Send::Qmail::QMAIL ne 'qmail-inject')
      ||
      # I hate that "used only once" warning:
      ($Email::Send::Qmail::QMAIL ne 'qmail-inject')
      # HOW else do we indicate in the environment that we want to use
      # Qmail?
     )
    {
    if ($TESTONLY)
      {
      return qq{$0 chose method Qmail};
      } # if
    return Email::Send::Qmail::send($oMessage, @_);
    } # if qmail
  # For undef warnings:
  $ENV{SENDMAIL} ||= '';
  if (
      ($^O =~ m!solaris!i)  # A fair assumption?
      ||
      ($^O =~ m!linux!i)  # A fair assumption?
     )
    {
    # User has customized the pointer to the sendmail program:
    if ($ENV{SENDMAIL} ne '')
      {
      $Email::Send::Sendmail::SENDMAIL = $Email::Send::Sendmail::SENDMAIL = $ENV{SENDMAIL};
      } # if
    if ($TESTONLY)
      {
      return qq{$0 chose method Sendmail};
      } # if
    return Email::Send::Sendmail::send($oMessage, @_);
    } # if solaris or linux
  return "Error: can not determine email send method\n";
  } # send_email


#=head1 NAME
#
#check_index_file($qid) -  insure the index.html file exists.
#
#
#=head1 DESCRIPTION
#
#If qid/index.html exists just return.
#Else create qid/ if necessary and call make_index
#to make the F<index.html> file.
#
#=cut

sub check_index_file {
  my ($qid) = @_;
  # do we have the necessary infrastructure?
  if (open (FIRST,"<$qid/index.html") ) { # yes
    # OK, close it.
    close (FIRST);
  } else { # no, make dir.
    if (mkdir ($qid, 0755) ) {
      if ($! =~ m/file exists/i) { # already done
        die "Can't create directory $qid.\nReason $!";
      }
    }
    chmod 0755, $qid || die "Can't chmod directory $qid.\nReason $!";
    &make_index($qid);
  }
  print STDERR "index.html exists, " if $main::v_dbg;
} # check_index_file

#=head1 NAME
#
#check_date_file($qid) -  insure the date.html file exists.
#
#=head1 DESCRIPTION
#
#If qid/date.html exists just return.
#Else create qid/ if necessary and call make_date
#to make the F<date.html> file.
#
#=cut

sub check_date_file {
  my($qid,$qn,$qs) = @_;
  # do we have the necessary infrastructure?
  if (open (FIRST,'<'.$qid."date.html") ) { # yes
    # OK, close it.
    close (FIRST);
  } else { # no, make dir.
    if (mkdir ($qid, 0755) ) {
      if ($! =~ m/file exists/i) { # already done
        die "Can't create directory $qid.\nReason $!";
      }
    }
    chmod 0755, $qid || die "Can't chmod directory $qid.\nReason $!";
    &make_date($qid,$qn,$qs);
  }
  print STDERR "date exists, " if $main::v_dbg;
}

#=head1 NAME
#
#read_query($prompt) -  read a string from STDIN.
#
#=head1 DESCRIPTION
#
#read STDIN, with a prompt and backspace editing, until <return>
#
#=cut

sub read_query {
 my($prompt) = @_;
 my($query) = '';
 my($c) = '';
 my($oldfh) = select(STDOUT); $| =1; select ($oldfh);
 print $prompt;
 while (read(STDIN,$c,1)) { # get a byte.
#   printf STDERR "%02x",ord($c);
   last if $c eq "\x0a";
   if ($c eq "\x08") {
     chop ($query);
     next;
   } else {
     $query .= $c;
   }
 }
# print STDERR "\ni see $query\n";
 return ($query);
}

#=head1 NAME
#
#read_query_list($prompt) -  read a list from STDIN.
#
#=head1 DESCRIPTION
#
#read STDIN, with a prompt and backspace editing, until <blank-line>
#
#=cut

sub read_query_list {
 my($prompt) = @_;
 my(@query_list);
 my($s);
 while (1) {
   $s = &read_query($prompt);
   last unless ($s);
   push(@query_list,$s);
 }
# print STDERR "\ni see $query_list\n";
 return (@query_list);
}

#=head1 NAME
#
#C<format_link($template,$field,$data)> -  create hyper links from a template.
#
#=head1 DESCRIPTION
#
#Replace the $field with $data in the $template given.
#For example:
#	print C<&format_link("Hello place.\n","place","world");>
#produces
#	Hello world.
#
#Used to replace default strings in the default documents with
#user supplied information.
#
#=cut

# format by text replacement.
sub format_link {
  my ($unformated,$field,$data) = @_;
  my ($temp) = $unformated; # start with unformated string.
  $temp =~ s/$field/$data/; # make the replacement.
  return ($temp);
}

#=head1 NAME
#
#C<make_link($template,$url,$title,$description)> -  create url.
#
#=head1 DESCRIPTION
#
#Replace the URL, TITLE, and DESCRIPTION  with $url, $title, and
#$description (respectively) in the $template given.
#
#Used to convert a url template to a hyper-link with title and description.
#
#=cut

sub make_link {
  my ($template,$url,$title,$description) = @_;
  my ($link) = $template;
  $link =~ s/URL/$url/ if defined($url);
  $link =~ s/TITLE/$title/ if defined($title);
  $link =~ s/DESCRIPTION/$description/ if defined($description);
  return ($link);
}

#=head1 NAME
#
#C<make_no_link($template,$url,$title,$description)> -  create url.
#
#=head1 DESCRIPTION
#
#Replace the URL, TITLE, and DESCRIPTION  with $url, $title, and
#$description (respectively) in the $template given.
#
#Used to convert a url template to a url with title and description.
#
#=cut

sub make_no_link {
  my ($template,$url,$title,$description) = @_;
  my ($link) = $template;
  $link =~ s/URL/$url/ if defined($url);
  $link =~ s/TITLE/$title/ if defined($title);
  $link =~ s/DESCRIPTION/$description/ if defined($description);
  return ($link);
}

#=head1 NAME
#
#C<get_weekly_parts($qid)> -  break input file into sub-fields.
#
#=head1 DESCRIPTION
#
#Used to convert an input file into the data elements, template and headings
#required to build nice looking web pages.
#
#=cut

#
# read top.html to get the basic format of the web pages.
# parts include Top, Topic, Appended, Suspended, Bottom
# sub-parts include Heading, Template, actual contents.
# these objects are identified and extracted from the
# complete file.  The format for all derived documents
# is determined by this file.  How the objects are combined
# to created dervied pages is determined by the software
# enclosed here-in.
#
sub get_weekly_parts {
  my($qid) = @_;
  $/ = undef(); # enable paragraph mode.
  my($Top,$Bottom);
  my($AppendedHeading,$AppendedTemplate,$Appended);
  my($SuspendedHeading,$SuspendedTemplate,$Suspended);
  open (PARTS,'<'.$qid.'date.html') || die "Can't open first date input file.\nReason: $!\n";
  my($part) = <PARTS>;
  close (PARTS);
#  print STDERR "Part:\"$part\"\n";

  $Top = &get_pair_part($part,"Top");

  $AppendedHeading = &get_part($part,"AppendedHeading");
  $AppendedTemplate = &get_part($part,"AppendedTemplate");
  $Appended = &get_pair_part($part,"Appended");

  $SuspendedHeading = &get_part($part,"SuspendedHeading");
  $SuspendedTemplate = &get_part($part,"SuspendedTemplate");
  $Suspended = &get_pair_part($part,"Suspended");

  $Bottom = &get_pair_part($part,"Bottom");
  return($Top,
         $AppendedHeading,$AppendedTemplate,$Appended,
         $SuspendedHeading,$SuspendedTemplate,$Suspended,
	 $Bottom);
}

#=head1 NAME
#
#C<get_summary_parts($qid)> -  break input file into sub-fields.
#
#=head1 DESCRIPTION
#
#Used to convert an input file into the data elements, template and headings
#required to build nice looking web pages.
#
#=cut

sub get_summary_parts {
  my($qid) = @_;
  $/ = undef(); # enable paragraph mode.
  my($Top,$Query,$SearchEngine,@QueryOptions,$URLFilter,$Bottom);
  my($SummaryHeading,$SummaryTemplate,$Summary);
  my($WeeklyHeading,$WeeklyTemplate,$Weekly);
  open (PARTS,'<'.$qid.'index.html') || die "Can't open index.html input file.\nReason: $!\n";
  my($part) = <PARTS>;
  close (PARTS);
#  print STDERR "Part:\"$part\"\n";

  $Top = &get_pair_part($part,"Top");
  $Query = &get_inline_part($part,"Query");
  $SearchEngine = &get_inline_part($part,"SearchEngine");
  # get array of key=value pairs
  @QueryOptions = &get_inline_list($part,"QueryOptions");
  $URLFilter = &get_inline_part($part,"URLFilter");

  $SummaryHeading = &get_part($part,"SummaryHeading");
  $SummaryTemplate = &get_part($part,"SummaryTemplate");
  $Summary = &get_pair_part($part,"Summary");

  $WeeklyHeading = &get_part($part,"WeeklyHeading");
  $WeeklyTemplate = &get_part($part,"WeeklyTemplate");
  $Weekly = &get_pair_part($part,"Weekly");

  $Bottom = &get_pair_part($part,"Bottom");
  return($Top,$Query,$SearchEngine,$URLFilter,
         $SummaryHeading,$SummaryTemplate,$Summary,
         $WeeklyHeading,$WeeklyTemplate,$Weekly,
	 $Bottom,@QueryOptions);
}

#=head1 NAME
#
#C<get_pair_part($part,$mark)> -  locate and return sub-fields.
#
#=head1 DESCRIPTION
#
#Use regular expressions to locate <!--$mark--> and <!--/$mark--> and
#return everything in between (including <return>s).
#
#=cut

# these objects are surrounded by <!--x--> <!--/x--> comments
# to be easily recognized; but always display..
sub get_pair_part {
  my($part,$mark) = @_;
  if ($part =~ m,<!--$mark-->\n(.*)<!--/$mark-->,s) {
#    print STDERR "$mark: \"$1\"\n";
    return ($1);
  }
  # print STDERR "Warning: can't find <!--$mark--> ... <--/$mark-->\n" if ($v_dbg);
  return ("");
}

#=head1 NAME
#
#C<get_part($part,$mark)> -  locate and return sub-fields.
#
#=head1 DESCRIPTION
#
#Use regular expressions to locate <!--$mark\n and /$mark--> and
#return everything in between (including <return>s).
#
#=cut

# these objects are surrounded by similiar matching x /x marks.
# these objects are actually comments and won't be seen unless
# modified.
sub get_part {
  my($part,$mark) = @_;
  if ($part =~ m,<!--$mark\n(.*)/$mark-->,s) {
#    print STDERR "$mark: \"$1\"\n";
    return ($1);
  }
  # print STDERR "Warning: can't find <!--$mark\\n ... /$mark-->\n" if ($v_dbg);
  return ("");
}

#=head1 NAME
#
#C<get_inline_part($part,$mark)> -  locate and return sub-fields.
#
#=head1 DESCRIPTION
#
#Use regular expressions to locate <!--$mark{ and }/$mark--> and
#return everything in between.
#
#=cut

# these objects are surrounded by similiar matching x /x marks.
# these objects are actually comments and won't be seen unless
# modified.
sub get_inline_part {
  my($part,$mark) = @_;
  if ($part =~ m,<!--$mark\{(.*)\}/$mark-->,s) {
#    print STDERR "inline $mark: \{$1\}\n";
    return ($1);
  }
  # print STDERR "Warning: can't find <!--$mark\{ ... \}/$mark-->\n" if ($v_dbg);
  return ("");
}


#=head1 NAME
#
#C<get_inline_list($part,$mark)> -  locate and return sub-fields.
#
#=head1 DESCRIPTION
#
#Use regular expressions to locate multiple occurrences of
#<!--$mark{ and }/$mark--> and return them as a list.
#
#=cut

# these objects are surrounded by similiar matching x /x marks.
# these objects are actually comments and won't be seen unless
# modified.
sub get_inline_list {
  my($part,$mark) = @_;
  if ($part =~ m,<!--$mark\{(.*)\}/$mark-->,s) {
    my(@PARTS) = split(/\n/, $part);
    my(@LINES) = grep(m,<!--$mark\{(.*)\}/$mark-->,s, @PARTS);
    my(@LIST,$is);
    foreach (@LINES) {
      next unless ($_ =~ m,<!--$mark\{(.*)\}/$mark-->,s);
#      print STDERR "inline $mark: \{$1\}\n";
      push (@LIST,$1);
    }
    return (@LIST);
  }
  # print STDERR "Warning: can't find <!--$mark\{ ... \}/$mark-->\n" if ($v_dbg);
  return ("");
}

#=head1 NAME
#
#C<make_index($qid)> -  make working copy of F<index.html>.
#
#=head1 DESCRIPTION
#
#Create F<qid/index.html> from either F<first_index.html>
#or from 'memory'.
#
#=cut

# check the root directory for default first_index file;
# else make one of our own.
sub make_index {
  my ($qid) = @_;
  open (INDEX, ">$qid/index.html") || die "Can't create index.html in $qid\nReason $!";
  # copy user-provided file...
  if (open (DEFAULT, "<$qid/../first_index.html") ) { # look for a default
    # copy in default provided by user.
    while (<DEFAULT>) {
      print INDEX $_;
    }
    close (DEFAULT) || die "Can't close file $qid/../first_index.html: $!";
    close (INDEX) || die "Can't close file $qid/index.html: $!";
    return;
  } 
  # or OUR provided file
  my($it) = <<EOF;
<HEAD>
<Title> index.html empty page to establish summary file format </Title>
</HEAD>

<BODY>
<!--Top-->
<!--Place the html to make your page start to look nice here-->
<!--In the next line place the pretty name of the query.-->
<h1>AutoSearch WEB Searching</h1>
<!--/Top-->

<!--In the next line place the actual query.-->
<!--Query{ask user}/Query-->
<!--In the next line place the actual search engine.-->
<!--SearchEngine{Null}/SearchEngine-->
<!--In the next line(s) place the query/search engine specific options.-->
<!--QueryOptions{}/QueryOptions-->
<!--In the next line place the actual url filter.-->
<!--URLFilter{}/URLFilter-->

<!--SummaryHeading
<h3>Summary of WEB search results</h3><p>
/SummaryHeading-->

<!--The list of unique 'hits' including a url and title.-->
<!--SummaryTemplate
<a href="URL">TITLE</a><br>
/SummaryTemplate-->

<!--Summary-->
<!--the list of unique 'hits' goes here.-->
<!--/Summary-->

<!--WeeklyHeading
<hr>
<h3>Weekly Search Results</h3><p>
/WeeklyHeading-->

<!--The list of 'hits' including a url and title.-->
<!--WeeklyTemplate
<a href="URL">TITLE</a><br>
/WeeklyTemplate-->

<!--Weekly-->
<!--the list of weekly results goes here.-->
<!--/Weekly-->

<!--Bottom-->
<!--Place the html to make your page finish up sharply here-->
<p>
Last modified October 17, 1996.
<!--/Bottom-->
</BODY>
EOF

  print INDEX $it;
  close(INDEX);
}

#=head1 NAME
#
#make_date($qid) -  make working copy of F<date.html>.
#
#=head1 DESCRIPTION
#
#Create F<qid/date.html> from either F<first_date.html>
#or from 'memory'.
#
#=cut

# check the root directory for default first_date file;
# else make one of our own.
sub make_date {
  my($qid,$qn,$qs) = @_;
  open (FIRST,'>'.$qid."date.html") || die "Can't create date in $qid\nReason $!";
  # copy user-provided file...
  if (open (DEFAULT,'<'.$qid."../first_date.html") ) { # look for a default
    # copy in default provided by user.
    while (<DEFAULT>) {
      s/{ask user}/\{$qs\}/ if (m,Query\{ask user\}/Query,);
      s/AutoSearch WEB Searching/$qn/ if (m,AutoSearch WEB Searching,);
      print FIRST $_;
    }
    close (DEFAULT) || die "Can't close default first_date.html file.\nReason:$!";
    close (FIRST) || die "Can't close date.html file.\nReason:$!";
    return;
  } 
  # or OUR provided file
  my($it) = <<EOF;
<HEAD>
<Title> first_date.html empty page to establish weekly file format </Title>
</HEAD>

<BODY>
<!--Top-->
<!--Place the html to make your page start to look nice here-->
<!--In the next line place the pretty name of the query.-->
<h1>AutoSearch WEB Searching</h1>
<!--/Top-->

<!--The Title of the search results. 'DATE' will be replaced with the date.-->
<!--AppendedHeading
<h3>Web Search Results for DATE</h3><p>
/AppendedHeading-->

<!--The list of 'hits' including a url, title and description.-->
<!--AppendedTemplate
<a href="URL">TITLE</a><br>
DESCRIPTION
/AppendedTemplate-->

<!--Appended-->
<!--the list of 'hits' goes here.-->
<!--/Appended-->

<!--SuspendedHeading
<hr>
<h3>URLs Apparently Suspended</h3><p>
/SuspendedHeading-->

<!--The list of 'misses' only the title.-->
<!--SuspendedTemplate
TITLE<br>
/SuspendedTemplate-->

<!--Suspended-->
<!--the list of 'misses' goes here.-->
<!--/Suspended-->

<!--Bottom-->
<!--Place the html to make your page finish up sharply here-->
<p>
Web searches maintained by <a href="http://www.isi.edu/lsam/tools/autosearch">AutoSearch</a>.
<!--/Bottom-->
</BODY>
EOF
  $it =~ s/{ask user}/\{$qs\}/ if ($it =~ m,Query\{ask user\}/Query,);
  $it =~ s/AutoSearch WEB Searching/$qn/ if ($it =~ m,AutoSearch WEB Searching,);
  print FIRST $it;
  close(FIRST);
}

sub time_now {
    return strftime("%m/%d/%Y %H:%M:%S", localtime(time));
}

sub time_today {
    return strftime("%b %d, %Y", localtime(time));
}

sub time_file_of_the_day_numeric {
    return strftime("%Y%m%d", localtime(time));
}


sub http_error_as_nice_string {
    my($response) = @_;
    my($message) = $response->message();
    my($code) = $response->code();
    chomp($message);
    return "$message (code $code)";
}

sub add_to_hash
  {
  # This is a bit of a hack.  A set of CGI options is not strictly a
  # hash, because multiple values for the same key can be specified.
  # To get around this, we rely on the fact that this hash of options
  # is only used to construct a CGI parameter list.  If we see
  # multiple values for the same key, we append the multiple values
  # onto the value of the key in CGI '?key=value' format.
  my ($key, $value, $hashref) = @_;
  if (exists($hashref->{$key}) && $hashref->{$key} ne '')
    {
    # There was already an option of this key given; append
    # multiple values as CGI arguments:
    $hashref->{$key} .= "&$key=$value";
    } # if exists
  else
    {
    # This is the only instance of this key; just insert the
    # hash value:
    $hashref->{$key} = $value;
    }
  } # add_to_hash

=head1 DESCRIPTION

B<AutoSearch> performs a web-based search and puts the results
set in F<qid/index.html>.
Subsequent searches (i.e., the second form above)
B<AutoSearch> determine what changes (if any) occurred to the
results sent since the last run.
These incremental changes are recorded in F<qid/YYYYMMDD.html>.

B<AutoSearch> is amenable to be run as a B<cron> job because all
the input parameters are saved in the web pages.  B<AutoSearch>
can act as a automated query agent for a particular search.  The output
files are designed to be a set of web pages to easily display the
results set with a web browser.

Example:

    AutoSearch -n 'LSAM Replication'
	-s '"lsam replication"'
	-e AltaVista
	replication_query

This query (which should be all on one line)
creates a directory replication_query
and fills it with the fascinating output of the AltaVista query
on C<"lsam replication">,
with pages titled ``LSAM Replication''.
(Note the quoting:  the single quotes in
C<'"lsam replication"'> are for the shell,
the double quotes are for AltaVista
to search for the phrase rather than the separate words.)

A more complicated example:

    AutoSearch -n 'External Links to LSAM'
	-s '(link:www.isi.edu/lsam or link:www.isi.edu/~lsam) -url:isi.edu'
	-e AltaVista::AdvancedWeb
	-o coolness=hot

This query does an advanced AltaVista search
and specifies the (hypothetical) ``coolness'' option
to the search engine.

=head1 OPTIONS

=over

=item C<qid>

The I<query identifer> specifies the directory in which all the
files that relate to this query and search results will live.
It can be an absolute path, or a relative path from cwd.
If the directory does not exist, it will be created and a new search started.

=item C<--stats>

Show search statistics: the query string,
number of hits, number of filtered hits,
filter string, number of suspended (deleted) hits,
previous set size, current set size, etc.

=item C<-v> or C<--verbose>

Verbose: output additional messages and warnings.

=item C<-n> or C<--qn> or C<--queryname>

Specify the query name.  The query name is used as a heading in the
web pages, therefore it should be a 'nice' looking version of the
query string.

=item C<-s> or C<--qs> or C<--querystring>

Specify the query string.  The query string is the character string
which will be submitted to the search engine.  You may include special
characters to group or to qualify the search.

=item C<-e> or C<--engine>

Specify the search engine.  The query string will be submitted 
to the user specified search engine.

In many cases there are specialized versions of search engines.
For example, B<AltaVista::AdvancedWeb> and B<AltaVista::News>
allow more powerful and Usenet searches.
See L<AltaVista> or the man page for your search engine
for details about specialized variations.

=item C<--listnewurls>

In addition to all the normal file maintenance,
print all new URLs to STDOUT, one per line.

=item C<-o> or C<--options>

Specify the query options.  The query options will be submitted 
to the user search engine with the query string.  This feature
permits modification of the query string for a specific search
engine or option.  More than one query option may be specified.

Example:
C<-o what=news>
causes AltaVista to search Usenet.
Although this works, the preferred mechanism
in this case would be C<-e AltaVista::News> or C<-e AltaVista::AdvancedNews>.
Options are intended for internal or expert use.


=item C<-f> or C<--uf> or C<--urlfilter>

This option specifies a regular expression which will
be compared against the URLs of any results;
if they match the case-insensitive regular expression, they will be removed
from the hit set.

Example:
C<-f '.*\.isi\.edu'> avoids all of ISI's web pages.

=item C<--cleanup i>

Delete all traces of query results from more than i days ago.  If
--cleanup is given, all other options other than the qid will be
ignored.

=item C<--cmdline>

Reconstruct the complete command line (AutoSearch and all its
arguments) that was used to create the query results.  Command line
will be shown on STDERR.  If --cmdline is given, all other options
other than the qid will be ignored.

=item C<--mail user@address> or C<-m user@address>

After search is complete, send email to that user, listing the NEW results.
Email is HTML format.
Requires the Email::Send and related modules.
If you send email through an SMTP server, you must set environment variable SMTPSERVER to your server name or IP address.
If your SMTP server requires password, you must set environment variables SMTPUSERNAME and SMTPPASSWORD.
If you send email via sendmail, you should set environment variable SENDMAIL if the sendmail executable is not in the path.

=item C<--emailfrom user@address>

If your outgoing mail server rejects email from certain users,
you can use this argument to set the From: header.

=item C<--userid bbunny>

If the search engine requires a login/password (e.g. Ebay::Completed), use this.

=item C<--password Carr0t5>

If the search engine requires a login/password (e.g. Ebay::Mature), use this.

=back


=head1 DESCRIPTION

B<AutoSearch> submits a query to a search engine, produces HTML pages
that reflect the set of 'hits' (filtered search results) returned by
the search engine, and tracks these results over time.  The URL and
title are displayed in the F<qid/index.html>, the URL, the title, and
description are displayed in the 'weekly' files.

To organize these results, each search result is placed in a query
information directory (qid).  The directory becomes the search results
'handle', an easy way to track a set of results.  Thus a qid of
C</usr/local/htdocs/lsam/autosearch/load_balancing> might locate the
results on your web server at
C<http://www.isi.edu/lsam/autosearch/load_balancing>.

Inside the qid directory you will find files relating to this query.
The primary file is F<index.html>, which reflects the latest search
results.  Every not-filtered hit for every search is stored in
F<index.html>.  When a hit is no longer found by the search engine it
a removed from F<index.html>.  As new results for a search are
returned from the search engine they are placed in F<index.html>.

At the bottom of F<index.html>, there is a heading "Weekly Search
Results", which is updated each time the search is submitted (see
L<AUTOMATED SEARCHING>).  The list of search runs is stored in reverse
chronological order.  Runs which provide no new information are
identified with

	No Unique Results found for search on <date>

Runs which contain changes are identified by

	Web search results for search on <date>

which will be linked a page detailing the changes from that run.

Detailed search results are noted in weekly files.  These files are
named F<YYYYMMDD.html> and are stored in the qid directory.  The
weekly files include THE URL, title, and a the description (if
available).  The title is a link to the original web page.


=head1 AUTOMATED SEARCHING

On UNIX-like systems, cron(1) may be used to establish periodic
searches and the web pages will be maintained by B<AutoSearch>.  To
establish the first search, use the first example under SYNOPSIS.  You
must specify the qid, query name and query string.  If any of the
items are missing, you will be interactively prompted for the missing
item(s).

Once the first search is complete you can re-run the search with the
second form under SYNOPSIS.

A cron entry like:

    0 3 * * 1 /nfs/u1/wls/AutoSearch.pl /www/div7/lsam/autosearch/caching

might be used to run the search each Monday at 3:00 AM.  The query
name and query string may be repeated; but they will not be used.
This means that with a cron line like:

    0 3 * * 1 /nfs/u1/wls/AutoSearch.pl /www/div7/lsam/autosearch/caching -n caching -s caching

a whole new search series can be originated by

    rm -r /www/div7/lsam/autosearch/caching

However, the only reason to start a new search series would be to
throw away the old weekly files.

We don't recommend running searches more than once per day, but if so
the per-run files will be updated in-place.  Any changes are added to
the page with a comment that "Recently Added:"; and deletions are
indicated with "Recently Suspended:."

=head1 CHANGING THE LOOK OF THE PAGES

The basic format of these two pages is simple and customizable.  One
requirement is that the basic structure remain unchanged.  HTML
comments are used to identify sections of the document.  Almost
everything can be changed except for the strings which identify the
section starts and ends.

Noteworthy tags and their meaning:

=over 16

=item <!--Top-->.*<!--/Top-->

The text contained within this tag is placed at the top of the output
page.  If the text contains I<AutoSearch WEB Searching>, then the
query name will replace it.  If the text does not contain this magic
string and it is the first ever search, the user will be asked for a
query name.

=item <!--Query{.*}/Query-->

The text contained between the braces is the query string.  This is
how B<AutoSearch> maintains the query string.  You may edit this
string to change the query string; but only in F<qid/index.html>.  The
text I<ask user> is special and will force B<AutoSearch> to request
the search string from the user.

=item <!--SearchEngine{.*}/SearchEngine-->

The text contained between the braces is the search engine.  Other
engines supported are HotBot and Lycos.  You may edit this string to
change the engine used; but only in F<qid/index.html>.  The text I<ask
user> is special and will force B<AutoSearch> to to request the search
string from the user.

=item <!--QueryOptions{.*}/QueryOptions-->

The text contained between the braces specifies a query options.
Multiple occurrences of this command are allowed to specify multiple
options.

=item <!--URLFilter{.*}/URLFilter-->

The text contained between the braces is the URL filter.  This is how
B<AutoSearch> maintains the filter.  Again you may edit this string to
change the query string; but only in F<qid/index.html>.  The text
I<ask user> is special and will force B<AutoSearch> to ask the user
(STDIN) for the query string.  When setting up the first search, you
must edit F<first_index.html>, not F<qid/index.html>.  The URL filter
is a standard perl5 regular expression.  URLs which do not match will
be kept.

=item <!--Bottom-->.*<!--/Bottom-->

The text contained within this tag is placed at the bottom of the
output page.  This is a good place to put navigation, page owner
information, etc.

=back

The remainder of the tags fall into a triplet of I<~Heading>,
I<~Template>, and I<~>, where ~ is Summary, Weekly, Appended, and
Suspended. The sub-sections appear in the order given.  To produce a
section B<AutoSearch> outputs the heading, the template, the section,
n copies of the formatted data, and an /section.  The tags and their
function are:

=over 16

=item ~Heading

The heading tag identifies the heading for a section of the output
file.  The SummaryHeading is for the summary portion, etc.  The
section may be empty (e.g., Suspended) and thus no heading is output.

=item ~Template

The template tag identifies how each item is to be formatted.  Simple
text replacement is used to change the template into the actual output
text.  The text to be replaced is noted in ALLCAPS.

=item ~

This tag is used to locate the section (Summary, Weekly, etc.).  This
section represents the actual n-items of data.

=back

You can edit these values in the F<qid/index.html> page of an existing
search.  The file F<first_index.html> (in the directory above F<qid>)
will be used as a default template for new queries.

Examples of these files can be seen in the pages under
C<http://www.isi.edu/lsam/tools/autosearch/>, or in the output generated by
a new AutoSearch.

=head1 FILES

=over 20

=item F<first_index.html>

optional file to determine the default format of the F<index.html>
file of a new query.

=item F<first_date.html>

optional file to determine the default format of the F<YYYYMMDD.html>
file for a new query.

=item F<qid/index.html>

(automatically created) latest search results, and reverse
chronological list of periodic searches.

=item F<qid/date.html>

file used as a template for the F<YYYYMMDD.html> files.

=item F<qid/YYYYMMDD.html>

(automatically created) summary of changes for a particular date (AKA
'Weekly' file).

=back

Optional files F<first_index.html> and F<first_date.html> are used for
the initial search as a template for F<qid/index.html> and
F<date.html>, respectively.  If either of these files does not exist;
a default-default template is stored within the F<AutoSearch> source.
The intention of these two files is to permit a user to establish a
framework for a group of search sets which have a common format.  By
leaving the default query name and query string alone, they will be
overridden by command line inputs.

=head1 SEE ALSO

For the library, see L<WWW::Search>,
for the perl regular expressions, see L<perlre>.

=head1 AUTHORS

Wm. L. Scheding

B<AutoSearch> is a re-implementation of an earlier version written by
Kedar Jog.

=head1 COPYRIGHT

Copyright (C) 1996-1997 University of Southern California.
All rights reserved.

Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
duplicated in all such forms and that any documentation, advertising
materials, and other materials related to such distribution and use
acknowledge that the software was developed by the University of
Southern California, Information Sciences Institute.  The name of the
University may not be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

=head1 DESIRED FEATURES

These are good ideas that people have suggested.

=over 4

=item URL validation.

Validate the status of each URL (with HTTP HEAD requests) and indicate
this status in the output.

=item Multi-search.

It should be possible to merge the results of searches from two
search-engines.  If this merger were done as a new search engine, this
operation would be transparent to AutoSearch.

=back

=head1 BUGS

None known at this time; please inform the maintainer mthurn@cpan.org
if any crop up.

=cut

__END__