341 lines
9.2 KiB
Perl
341 lines
9.2 KiB
Perl
#!/usr/local/bin/perl
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#
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# info.pl
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#
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# Create SUBJECT.t files from the Info Pages.
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#
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# written by Ken Stevens
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#
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#
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# DESCRIPTION:
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# info.pl reads all of the info pages and creates a table of contents
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# for them organized by subject.
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#
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# Info consists of pages organized into chapters and subjects. Each
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# page is about a topic. The page for topic ITEM is in info file
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# info/ITEM.t. An info page's chapter is the first argument of its
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# .TH request. It belongs to a subject if that subject appears in its
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# .SA request ("SEE ALSO") _and_ that entry is not the name of another
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# info page. An info page may belong to more than one subject.
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#
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# For example, the .SA request of headlines.t contains "newspaper" and
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# "Communication". Since there's already an info page called
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# "newspaper.t", but there is no "Communication" info page, the
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# headlines info page is considered to be a member of the
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# Communication subject.
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#
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# This script reads GNUmakefile and sources.mk to find info sources.
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# It reads existing subjects from subjects.mk, and updates that file.
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# It creates a file info/SUBJECT.t for each SUBJECT, and a table of
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# subjects info/TOP.t.
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#
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# REQUIREMENTS:
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# info.pl requires perl5 to run. If you don't have version 5 of perl, then
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# you'll either have to install it, or you'll have to get someone to create
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# your Subjects.t files for you.
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#
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# HOW TO RUN IT:
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# Run "info.pl" at the root of the build tree.
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# --- Global variables ---
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# @Subjects Existing subjects
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# @Chapters Existing chapters
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# $filename The name of the current info file
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# $chapter{TOPIC} TOPIC's chapter (first arg to .TH)
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# $desc{TOPIC} A one line description of TOPIC (second arg to .NA)
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# $level{TOPIC} TOPIC's difficulty level (arg to .LV)
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# $see_also{TOPIC}
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# TOPIC's SEE ALSO items (.SA argument)
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# $sanr{TOPIC} Line number of TOPIC's .SA request
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# $subject{$subj}{$chap} = "item1\nitem2\n..."
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# Topics in that subject organized by chapter.
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# $largest{$sub} The largest topic name in that subject (used for
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# column formatting)
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#
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# --- File handles ---
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# F Filehandle for info page sources and makefiles
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# SUBJ Filehandle for Subject.t
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# TOP Filehandle for TOP.t
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#
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# --- Functions ---
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#
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# read_make_var Read a variable value from a makefile
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# parse_file Check the .TH, .NA, and .SA fields & parse them
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# parse_see_also Create %subject from %see_also
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# set_subject Add a new entry to %subject and possibly to %largest
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# create_subj Create a Subject.t file
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# create_subjects Remove the old Subject.t files and create new ones
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# flush_subj Print a row of Subjects to TOP
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# error Print an integrity error to STDERR and exit with code 1.
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use strict;
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use warnings;
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use Errno qw(ENOENT);
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use Fcntl qw(O_WRONLY O_EXCL O_CREAT);
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our (%chapter, %desc, %level, %see_also, %sanr);
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our ($filename, %subject, %largest);
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eval("require 5"); # Test for perl version 5
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die "$0 requires version 5 of perl.\n" if $@;
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# The chapters, in order
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our @Chapters = qw/Introduction Concept Command Server/;
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# Get known subjects
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our @Subjects = split(' ', read_make_var("subjects", "subjects.mk", ""));
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# Get source directory
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my $srcdir = read_make_var("srcdir", "GNUmakefile");
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# Get info sources
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my @tsrc = grep(/\.t$/, split(' ' , read_make_var("src", "sources.mk")));
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# Parse the .t files
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for my $t (@tsrc) {
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parse_file("$srcdir/$t");
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}
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# Create %subject from %see_also
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for my $t (sort keys %desc) {
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parse_see_also($t);
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}
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# Create the Subject.t files
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@Subjects = create_subjects();
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# Update subjects.mk
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open(F, ">subjects.mk")
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or die "Can't open subjects.mk for writing: $!";
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print F "subjects := " . join(' ', @Subjects) . "\n";
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close(F);
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exit 0;
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# Read a variable value from a makefile
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sub read_make_var {
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my ($var, $fname, $dflt) = @_;
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my $val;
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unless (open(F, "<$fname")) {
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return $dflt if $! == ENOENT and defined $dflt;
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die "Can't open $fname: $!";
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}
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while (<F>) {
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if (/^[ \t]*\Q$var\E[ \t]:?=*(.*)/) {
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$val = $1;
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last;
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}
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}
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close(F);
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$val or die "Can't find $var in $fname";
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return $val;
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}
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# Check .TH, .NA, .LV and .SA.
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# Parse .NA into %desc and .SA into %see_also
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sub parse_file {
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($filename) = @_;
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my $topic;
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$topic = $filename;
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$topic =~ s,.*/([^/]*)\.t$,$1,;
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open(F, "<$filename")
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or die "Can't open $filename: $!";
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$_ = <F>;
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if (/^\.TH (\S+) (\S.+\S)$/) {
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if (!grep(/^$1$/, @Chapters)) {
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error("First argument to .TH was '$1', which is not a known chapter");
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}
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$chapter{$topic} = $1;
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if ($1 eq "Command" && $2 ne "\U$topic") {
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error("Second argument to .TH was '$2' but it should be '\U$topic'");
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}
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} else {
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error("The first line in the file must be a .TH request");
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}
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$_ = <F>;
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if (/^\.NA (\S+) "(\S.+\S)"$/) {
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if ($topic ne $1) {
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error("First argument to .NA was '$1' but it should be '$topic'");
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}
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$desc{$topic} = $2;
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} else {
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error("The second line in the file must be a .NA request");
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}
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$_ = <F>;
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if (/^\.LV (\S+)$/) {
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if ($1 ne 'Basic' && $1 ne 'Expert') {
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error("The argument to .LV was '$1' but it must be either 'Basic' or 'Expert'");
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}
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$level{$topic} = $1;
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} else {
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error("The third line in the file must be a .LV request");
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}
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while (<F>) {
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last if /^\.SA/;
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}
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if ($_) {
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if (/^\.SA "([^\"]*)"/) {
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$see_also{$topic} = $1;
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$sanr{$topic} = $.;
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} else {
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error("Incorrect .SA Syntax. Syntax should be '.SA \"item1, item2\"'");
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}
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while (<F>) {
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error("Multiple .SA requests. Each file may contain at most one.") if /^\.SA/;
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}
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} else {
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error(".SA request is missing");
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}
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close F;
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}
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# Create %subject from %see_also
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sub parse_see_also {
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my ($topic) = @_;
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my @see_also = split(/, /, $see_also{$topic});
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my $wanted = $chapter{$topic};
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my $found; # found a subject?
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$wanted = undef if $wanted eq 'Concept' or $wanted eq 'Command';
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$filename = "$srcdir/$topic";
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for (@see_also) {
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if (!exists $desc{$_}) { # is this entry a subject?
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set_subject($_, $topic);
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$found = 1;
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}
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if ($wanted && $_ eq $wanted) {
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$wanted = undef;
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}
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}
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$. = $sanr{$topic};
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error("No subject listed in .SA") unless $found;
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error("Chapter $wanted not listed in .SA") if $wanted;
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}
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# Add a new entry to %subject and possibly to %largest
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sub set_subject {
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my ($sub, $topic) = @_;
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my $chap = $chapter{$topic};
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$subject{$sub}{$chap} .= "$topic\n";
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$largest{$sub} = "" unless defined $largest{$_};
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$largest{$sub} = $topic if length $topic > length $largest{$sub};
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$largest{$sub} = $chap if length $chap > length $largest{$_};
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}
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# Create a Subject.t file
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sub create_subj {
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my ($subj) = @_;
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my $fname = "info/$subj.t";
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print " Creating $fname\n";
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print "WARNING: $subj is a NEW subject\n"
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unless grep(/^$subj$/, @Subjects);
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sysopen(SUBJ, $fname, O_WRONLY | O_EXCL | O_CREAT)
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or die "Unable to create $fname: $!\n";
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print SUBJ '.\" DO NOT EDIT THIS FILE. It was automatically generated by info.pl'."\n";
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print SUBJ ".TH Subject \U$subj\n";
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$largest{$subj} =~ s/-/M/g;
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print SUBJ ".in \\w'$largest{$subj}XX\\0\\0\\0\\0'u\n";
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for my $chap (@Chapters) {
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next unless exists $subject{$subj}{$chap};
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print SUBJ ".s1\n";
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for (split(/\n/, $subject{$subj}{$chap})) {
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print SUBJ ".L \"$_ ";
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if ($level{$_} eq 'Basic') {
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print SUBJ "* \"\n";
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} else {
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print SUBJ " \"\n";
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}
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print SUBJ "$desc{$_}\n";
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}
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}
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print SUBJ <<EOF;
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.s1
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.in 0
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For info on a particular subject, type "info <subject>" where <subject> is
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one of the subjects listed above. Subjects marked by * are the most
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important and should be read by new players.
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EOF
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close SUBJ;
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}
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# Remove the old Subject.t files and create the Subject.t files and TOP.t
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sub create_subjects {
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my (@colsubj, @rowsubj, @subj);
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print " Removing Subjects\n";
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for (@Subjects) {
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unlink "info/$_.t";
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}
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print " Creating info/TOP.t\n";
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open(TOP, ">info/TOP.t")
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or die "Can't open info/TOP.t: $!";
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print TOP <<EOF;
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.TH Info "List of Subjects"
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.s1
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Empire info is available on the following subjects:
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.NF
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EOF
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@rowsubj = sort keys %subject;
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for my $subj (@Subjects) {
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print "WARNING: The subject $subj has been removed.\n"
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unless grep (/^$subj$/, @rowsubj);
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}
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# reorder subjects for display in three columns
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my $k = 0;
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for my $i (0..2) {
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for (my $j = $i; $j <= $#rowsubj; $j += 3) {
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$colsubj[$j] = $rowsubj[$k++];
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}
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}
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for my $subj (@colsubj) {
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create_subj($subj);
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push(@subj, $subj);
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if ($#subj > 1) {
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flush_subj(@subj);
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@subj = ();
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}
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}
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flush_subj(@subj);
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print TOP <<EOF;
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.FI
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Type "info <Subject>" where <Subject> is one of the subjects listed above.
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For a complete list of all info topics, type "info all".
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EOF
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close TOP;
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return @rowsubj;
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}
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# Print a row of subjects to TOP
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sub flush_subj {
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return unless $#_ >= 0;
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print TOP " ";
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for (@_) {
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printf TOP "%-25s", $_;
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}
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print TOP "\n";
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}
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# Print an integrity error message and exit with code 1
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sub error {
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my ($error) = @_;
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print STDERR "info.pl:$filename:$.: $error\n";
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exit 1;
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}
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