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# $Id: faqfile.pl,v 1.20 1994/02/22 01:39:57 jik Exp $
#
# Copyright (c) 1992 Jonathan I. Kamens. See the GNU Public License
# (any version) for terms of distribution.
package faqfile;
$default_interval = 0;
$default_sigfile = "none";
$default_force = 0;
$check_duplicates = 1;
$; = "\034";
# Set this only at the beginning of FAQ config file operations!
$file_version = 1;
sub parse_faq {
# The format of an individual FAQ specification line in the config
# file is as follows:
#
# idname file timestamp interval sigfile force parent
#
# The fields are separated by blank space. If the $file_version
# variable is greater than 1, An entire field can be
# quoted by enclosing it in single or double quotes and any
# character can be quoted by preceding it by backslash.
# Otherwise, fields cannot include spaces or tabs, and backslashes
# are treated literally.
#
# A blank field should be indiated with a single period.
#
# idname -- The string to use as the unique name of the FAQ in the
# Message ID of the posted article.
# file -- The file containing the text of the FAQ. This should be
# readable from the current directory.
# timestamp -- The timestamp of when the article was last posted.
# If unspecified, the article is assumed not to have been
# posted. This field is filled in automatically by the program
# when it rewrites the config file after doing a set of
# postings.
# interval -- If a number, the number of days to wait after the
# last posting before posting the FAQ again. Defaults to the
# interval hard-coded into the program, or to the interval
# specified with the "-interval" command-line option.
#
# If not a number, and the $file_version variable is greater
# than 1, then a perl expression to be evaluated to determine
# whether or not to post the FAQ. When the expression is
# evaluated, the following variables will be defined:
#
# $minute the current minute in the hour, 0 through 59
# $hour the current hour, 0 through 23
# $mday the current day of the month, 0 through 31
# $month the current month, 0 through 11
# $year the current year
# $wday the current day of the week, 0 through 6 (0 is
# Sunday)
# $yday the current day in the year
# $interval the number of days since the last posting, or
# undef if there is no previous posting timestamp
#
# The expression should evaluate to true if the FAQ should be
# posted.
#
# sigfile -- The signature file to append to the bottom of the
# message, with "-- \n" prepended to it. If unspecified,
# defaults to the hard-coded path or to the file specified with
# "-sigfile". If "none", don't include a signature file. So,
# you can't have a signature file named "none" in the current
# working directory; use "./none". So sue me.
# force -- If specified, then treat the contents as a number. If
# it is 0, then never force the posting of this article. If it
# is a 1, then force the posting of this article just once, and
# replace the 1 with an empty field ('.') when done doing so.
# If it is a 2, then always force the posting of this article.
# If it is a 3, then force the posting of this article just
# once, and replace the 3 with -2 when done doing so. If it is
# a -1 or -2, then force the article NOT to be posted, no matter
# what. Any other values are illegal. If not specified, the
# hard-coded force parameter or the presence or absence of
# "-force" on the command line is used to decide whether or not
# to force.
# parent -- The ID name of the parent article of this one, if any.
# The parent's FAQ specification must appear earlier in the
# config file than the child's. If a parent is specified, then
# the child article will not be posted unless the parent was
# posted successfully. Note that *if* the parent posts
# successfully, the child won't post unless its interval has
# expired, so if you want the child to post whenever the parent
# did, make sure to use "force" (see above).
#
# Blank lines, lines with only whitespace, and lines starting with
# '#' in the config file are ignored.
local($line) = @_;
local($whitespace);
local(@fields);
return undef if (($line =~ /^[ \t]*$/) || ($line =~ /^\#/));
if ($file_version < 2) {
@fields = split(' ', $line);
}
else {
($whitespace, @fields) = &split_fields($line);
}
if (! @fields) {
warn "Malformatted FAQ specification \"$line\". Ignoring FAQ.\n";
return undef;
}
elsif (@fields != 7) {
warn "Wrong number of fields in FAQ specification \"$line\". Ignoring FAQ.\n";
return undef;
}
local($idname) = shift @fields;
if ($idname eq "") {
warn "No ID name specified in FAQ specification \"$line\". Ignoring FAQ.\n";
return undef;
}
if ($check_duplicates && $faqs{$idname,"file"}) {
warn "Duplicate ID name $idname. Ignoring FAQ.\n";
return undef;
}
local($file) = shift @fields;
if ($file eq "") {
warn "No file specified in FAQ specification in \"$line\". Ignoring FAQ.\n";
return undef;
}
local($timestamp) = shift @fields;
if ($timestamp eq ".") {
$timestamp = undef;
}
elsif ($timestamp !~ /^[0-9]+$/) {
warn "Timestamp \"$timestamp\" in FAQ specification \"$line\" is invalid. Ignoring FAQ.\n";
return undef;
}
local($interval) = shift @fields;
if ($interval eq ".") {
$interval = undef;
}
elsif ($interval !~ /^[0-9.]+$/) {
if ($file_version < 2) {
warn "Interval \"$interval\" in FAQ specification \"$line\" is invalid. Ignoring FAQ.\n";
return undef;
}
}
local($sigfile) = shift @fields;
($sigfile = undef) if ($sigfile eq ".");
local($force) = shift @fields;
if ($force eq ".") {
$force = undef;
}
elsif (($force !~ /^(-|)[0-9]+$/) || ($force < -2) || ($force > 3)) {
warn "Force parameter \"$force\" in FAQ specification \"$line\" is invalid. Ignoring FAQ.\n";
return undef;
}
local($parent) = shift @fields;
if ($parent eq ".") {
$parent = undef;
}
elsif (! $faqs{$parent,"file"}) {
warn "FAQ specification \"$line\" has unknown parent \"$parent\". Ignoring FAQ.\n";
return undef;
}
$faqs{$idname,"file"} = $file;
$faqs{$idname,"timestamp"} = $timestamp;
$faqs{$idname,"interval"} = $interval;
$faqs{$idname,"sigfile"} = $sigfile;
$faqs{$idname,"force"} = $force;
$faqs{$idname,"parent"} = $parent;
if ($file_version > 1) {
$faqs{$idname,'whitespace'} = $whitespace;
}
else {
$faqs{$idname,"configline"} = $line;
}
return($idname, eval "\"$file\"", $timestamp,
$interval ? $interval : $default_interval,
$sigfile ? $sigfile : $default_sigfile,
$force ? $force : $default_force, $parent);
}
sub get_file {
$faqs{$_[0],"file"};
}
sub get_timestamp {
$faqs{$_[0],"timestamp"};
}
sub get_interval {
if ($faqs{$_[0],"file"}) {
$faqs{$_[0],"interval"} || $default_interval;
}
else {
undef;
}
}
sub get_sigfile {
if ($faqs{$_[0],"file"}) {
$faqs{$_[0],"sigfile"} || $default_sigfile;
}
else {
undef;
}
}
sub get_force {
if ($faqs{$_[0],"file"}) {
$faqs{$_[0],"force"} || $default_force;
}
else {
undef;
}
}
sub get_parent {
$faqs{$_[0],"parent"};
}
sub set_posted {
$faqs{$_[0],"posted"}++;
}
sub set_name {
local($old, $new) = @_;
for ("file", "timestamp", "interval", "sigfile", "force", "parent",
"configline") {
$faqs{$new,$_} = $faqs{$old,$_};
}
&delete($old);
}
sub set_file {
return if (! $_[1]);
$faqs{$_[0],"file"} = $_[1];
}
sub set_timestamp {
local($idname, $timestamp) = @_;
($timestamp = ".") if (! $timestamp);
$faqs{$idname,"timestamp"} = $timestamp;
}
sub set_interval {
local($idname, $interval) = @_;
($interval = ".") if (! $interval);
$faqs{$idname,"interval"} = $interval;
}
sub set_sigfile {
local($idname, $sigfile) = @_;
($sigfile = ".") if (! $sigfile);
$faqs{$_[0],"sigfile"} = $sigfile;
}
sub set_force {
local($idname, $force) = @_;
($force = ".") if (! $force);
$faqs{$idname,"force"} = $force;
}
sub set_parent {
local($idname, $parent) = @_;
($parent = ".") if (! $parent);
$faqs{$idname,"parent"} = $parent;
}
sub configline {
local($id) = $_[0];
local($_);
local($fi, $t, $i, $s, $fo, $p) =
($faqs{$id,"file"}, $faqs{$id,"timestamp"}, $faqs{$id,"interval"},
$faqs{$id,"sigfile"}, $faqs{$id,"force"}, $faqs{$id,"parent"});
$t = "." if (! $t);
$i = "." if (! $i);
$s = "." if (! $s);
$fo = "." if (! $fo);
$p = "." if (! $p);
if ($file_version > 1) {
local($line, @whitespace);
@whitespace = split($;, $faqs{$id,"whitespace"});
$line = shift @whitespace;
for ($id, $fi, $t, $i, $s, $fo, $p) {
s/[\'\"\\ \t]/$1/g;
$line .= $_ . (shift @whitespace);
}
# Catch any whitespace at the end of the line
$line .= (shift @whitespace) if (@whitespace);
# This needs to be "return $line" rather than just "$line", because
# it's local to this block, because of a bug in Perl 4.036, which
# Larry said he'll figure out how ti fix in Perl 5.
return $line;
}
else {
if ($faqs{$id,"configline"} !~ s/^(\s*)[^\s]+(\s+)[^\s]+(\s+)[^\s]+(\s+)[^\s]+(\s+)[^\s]+(\s+)[^\s]+(\s+)[^\s]+(\s*)$/$1$id$2$fi$3$t$4$i$5$s$6$fo$7$p$8/) {
die sprintf("possible internal error in faqfile'configline\n(For archive name %s, configline is\n%s", $id, $faqs{$id,"configline"});
}
$faqs{$id,"configline"};
}
}
sub was_posted {
$faqs{$_[0],"posted"};
}
sub timestamp {
$faqs{$_[0],"timestamp"};
}
sub new_configline {
local($idname, $file, $timestamp, $interval, $sigfile, $force, $parent) =
@_;
local($_);
if ($file_version > 1) {
for ($idname, $file, $timestamp, $interval, $sigfile, $force,
$parent) {
s/([\'\"\\ \t])/$1/g;
}
}
sprintf("%s\t%s\t%s\t%s\t%s\t%s\t%s", $idname, $file,
$timestamp ? $timestamp : ".", $interval ? $interval : ".",
$sigfile ? $sigfile : ".", $force ? $force : ".",
$parent ? $parent : ".");
}
sub delete {
local($name) = @_;
for ("file", "timestamp", "interval", "sigfile", "force", "parent",
"configline", "whitespace") {
delete $faqs{$name,$_};
}
}
sub split_fields {
local($_) = $_[0];
local(@fields);
local(@whitespace);
local($whitespace);
while (1) {
if (s/^(\s*)([\"\'])(([^\2\\]|\\.)*)\2//) {
push(@whitespace, $1);
push(@fields, $3);
}
elsif (/^\s*[^\'\"]/ && s/^(\s*)(([^\\ \t]|\\.)+)//) {
push(@whitespace, $1);
push(@fields, $2);
}
else {
return undef if (/\S/);
push(@whitespace, $_);
last;
}
}
grep(s/\\(.)/$1/g, @fields);
$whitespace = join($;, @whitespace);
($whitespace, @fields);
}
sub should_post {
local($idname, $time) = @_;
local($parent);
local($post_interval);
local($timestamp);
local($second, $minute, $hour, $mday, $month, $year, $wday, $yday,
$interval);
local($do_post);
local($force);
# Uses the following criteria to determine whether or not an FAQ
# should be posted:
# 1. If its force field is negative, don't post.
# 2. If it has a parent that wasn't posted, don't post.
# 3. If the force field is positive, post.
# 4. If its interval field contains just a number which is smaller
# than the number of days since the last posting, then post.
# 5. If the interval field contains something other than a number,
# then evaluate it as described in the comments above and post if
# it is true. This only works if $file_version > 1.
# 6. Otherwise, don't post.
if (($force = &get_force($idname)) < 0) {
return(0, "force field is negative");
}
elsif (($parent = &get_parent($idname)) && !&was_posted($parent)) {
return(0, "parent was not posted");
}
elsif ($force) {
return(1, "force field is positive");
}
$post_interval = &get_interval($idname);
$timestamp = &get_timestamp($idname);
if ($timestamp) {
# "3600" means 1 hour, a tolerance to allow daily posts
$interval = (time - $timestamp + 3600) / (60 * 60 * 24);
}
if ($post_interval =~ /^[0-9]+$/) {
local($scheduled);
return(1, "no previous timestamp") if (! $interval);
return(1, "posting interval expired") if ($interval > $post_interval);
$scheduled = &date($timestamp + 60 * 60 * 24 * $post_interval);
return(0, "scheduled to be posted on or around $scheduled");
}
else {
($second, $minute, $hour, $mday, $month, $year, $wday, $yday) =
localtime($time || time);
$year += 1900;
$do_post = eval $post_interval;
if ($@) {
local($foo) = "Interval expression \"$post_interval\" had error during eval: $@";
warn "$foo.\n";
return(0, $foo);
}
return(1, "interval expression \"$post_interval\" is true")
if $do_post;
return(0, "interval expression \"$post_interval\" is false");
}
}
sub expire_search {
local($idname, $time) = @_;
local($count);
local($timeout, $reason);
return undef if (! &get_interval($idname));
$time = time if (! $time);
while (1) {
$time += 60 * 60 * 24; # one day
($timeout, $reason) = &should_post($idname, $time);
return $time if ($timeout);
warn "Finished $count iterations for $idname in \&faqfile'expire_search; Possibly looping?\n"
if ((++$count % 100) == 0);
}
}
@months = ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug',
'Sep', 'Oct', 'Nov', 'Dec');
sub date {
($sec, $min, $hour, $mday, $mon, $year) = localtime($_[0]);
sprintf("%s %d, %d", $months[$mon], $mday, 1900 + $year);
}
1;
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