: # Use perl
eval 'exec perl -S $0 "$@"'
  if $running_under_some_shell;

$vid=107;
use File::Copy;

$| = 1;
%p = ("ImageMagick" => "mogrify", "pbmplus" => "giftoppm",
      "netpbm" => "giftopnm", "TeX" => "tex", "Ghostscript" => "gs");
%DOS = ('html2ps.html' => 'html2ps.htm', 'html2psrc.5' => 'html2psr.5');
@reqpath = ();

die "I am sorry, html2ps requires Perl 5.\n" if($]<5);

if(-e '/dev/null') {
    $pathsep = ':';
    $dirsep = '/';
    $sys = 'unix';
    $prefix = '/usr/local';
} elsif (-e 'nul') {
    $pathsep = ';';
    $dirsep = '\\';
    $sys = 'dos';
    $prefix = 'C:\Program\html2ps';
    $p{Ghostscript} = 'gswin32c';
    $ENV{PATH} .= ';C:\Acrobat';
} else {
    &getval($goon, "n", "\nThis installation script is for Unix and Windows "
    ."systems, and yours does not\nseem to be one. Do you want to continue "
    ."anyway?");
    die "\n" if($goon=~/^n/i);
}
@perl = ("Image${dirsep}Magick.pm", "LWP${dirsep}UserAgent.pm");

print <<EOD;

This is the installation script for html2ps. To get full functionality, some
external program packages need to be installed. You may wish to install these
first (see the enclosed documentation for addresses):

 * For conversion on inline images, any of the packages ImageMagick, pbmplus
   or netpbm.

 * To retrieve remote documents you must have libwww-perl. Alternatively,
   some program like wget or lynx.

 * To be able to generate cross references and DSC PostScript, you must
   have Ghostscript installed.

 * To be able to convert documents using the MATH element from HTML 3.0,
   you need both TeX and dvips.

This script creates a file describing the local configuration. To make this
accurate, you should have your search PATH set to include the directories
where the abovementioned packages are. You must also have write access to
the directories where the files should be placed.
EOD

&getval($goon, "y", "\nDo you want to proceed with the installation?");
die "\n" if($goon!~/^y/i);

print "\n";
for $req (@perl) {
    print "Searching for $req: ";
    X:for $dir (@INC) {
        if(-f "$dir${dirsep}$req") {
            $module{$req} = 1;
            print "found ($dir${dirsep}$req)\n";
            last X;
        }
    }
    print "not found\n" if(!$module{$req});
}

$pack = "";
if(&exist("ImageMagick",1)) {
    $pack .= "    ImageMagick: 1;\n";
    $pack .= "    PerlMagick: 1;\n" if($module{"Image${dirsep}Magick.pm"});
} elsif(&exist("netpbm",1)) {
    $pack .= "    netpbm: 1;\n";
} elsif(&exist("pbmplus",1)) {
    $pack .= "    pbmplus: 1;\n";
}

print <<EOW if(!$pack);

Could not find any image conversion package (pbmplus, netpbm or ImageMagick)
in your search path. If you want to be able to have inline images (other than
XBM images) included in the PostScript code, you must install one of these
packages. If you do indeed have any of these packages installed, you will
have to edit the configuration file manually, see the documentation for
details.

EOW

for ("djpeg","TeX","dvips","Ghostscript") {
    if(&exist($_,1)) {
        $pack .= "    $_: 1;\n";
    }
}
if(&exist("weblint",1)) {
    $pack .= "    check: weblint;\n";
}

if($module{"LWP${dirsep}UserAgent.pm"}) {
    $pack .= "    libwww-perl: 1;\n";
} else {
    if(&exist("lynx",0)) {
        $lynx = 1;
        $lynxcmd = "lynx -source -mime_header";
        $getdef = $lynxcmd;
    }
    if(&exist("wget",0)) {
        $wget = 1;
        $ugcmd = "wget -s -q -O-";
        $getdef = $ugcmd;
    }
    $both = $wget && $lynx? " (for example '$ugcmd' or\n'$lynxcmd')": "";
    $none = $wget || $lynx? "":
           ", or press <return> to convert local files only";
    &getval($geturl, $getdef,
    "\nBy default html2ps uses libwww-perl to retrieve remote documents, "
    ."I cannot\nfind this on your system. You may instead use some command "
    ."that can retrieve\ndocuments _with_a_complete_MIME_header_$both\.\n"
    ."Enter such a command$none");
    $geturl = "/bin/true" if(!$geturl);
    $pack .= "    geturl: \"$geturl\";\n";
}

if(@reqpath) {
    $pack .= '    path: "'.join($pathsep, @reqpath).'";';
}

chop ($cd = `pwd`);

&getval($ans, "y",
 "\nBy default all files will be installed in subdirectories 'bin', 'lib',\n"
 ."and 'man' in a common directory. Is this OK?");
$def = $ans=~/^y/i;

if($def) {
    &getval($prefix, "$prefix", "\nEnter the name of this directory");
    &fixdir($prefix);
    while(!&goodprefix) {
	&getval($prefix, "$prefix", "\nEnter a new directory name");
    }
    &makedir($prefix,0);
}

if($def) {
    $bindir = "$prefix${dirsep}bin";
} else {
    &getval($bindir, "$prefix${dirsep}bin",
     "\nEnter the directory where the html2ps script should be put");
    &fixdir($bindir);
    ($prefix) = $bindir=~m|(.*)\Q$dirsep\E[^\Q$dirsep\E]+|;
}
&makedir($bindir,$def);

if($def) {
    $glob = "$prefix${dirsep}lib${dirsep}html2ps";
} else {
    &getval($glob, "$prefix${dirsep}lib${dirsep}html2ps",
     "\nEnter the the directory where the global configuration file for\n"
    ."html2ps should be put");
    $glob =~ s|/$||g;
    &fixdir($glob);
}
&makedir($glob,$def);
$repl = "y";
if(-f "$glob${dirsep}html2psrc") {
    &getval($repl, "y", "\nA file $glob${dirsep}html2psrc already exists, replace?");
}

if($def) {
    $man1 = "$prefix${dirsep}man${dirsep}man1";
} else {
    &getval($man1, "$prefix${dirsep}man${dirsep}man1",
     "\nEnter the directory for the html2ps manual page");
    &fixdir($man1);
}
&makedir($man1,$def);

if($def) {
    $man5 = "$prefix${dirsep}man${dirsep}man5";
} else {
    &getval($man5, "$prefix${dirsep}man${dirsep}man5",
     "\nEnter the directory for the manual page describing the configuration\n"
     ."file format for html2ps");
    &fixdir($man5);
}
&makedir($man5,$def);

$ht = "\nTo use the automatic hyphenation feature, hyphenation pattern files\n"
     ."from the TeX distribution are needed.";
$cophy = 1;
if($exist{'TeX'}) {
    $hfile = "";
    ($texdir = $dir{'TeX'}) =~ s|/bin$||;
    SW:for("texmf/tex/generic/hyphen","macros","inputs","lib/macros",
        "lib/inputs","lib/tex/macros","lib/tex/inputs") {
        if(-f "$texdir/$_/ushyph1.tex") {
            $hyph = "$texdir/$_";
            $hfile = "$hyph/ushyph1.tex";
            last SW;
        }
        if(-f "$texdir/$_/hyphen.tex") {
            $hyph = "$texdir/$_";
            $hfile = "$hyph/hyphen.tex";
            last SW;
        }
    }
    if($hfile) {
        &getval($hdef, "y", "$ht I believe that I have found\nthe pattern "
         ."file for English in your TeX installation:\n\n  "
         ."$hfile\n\nWould you like to use this instead of the "
         ."file included with html2ps?");
        if($hdef=~/^y/i) {
            $cophy = 0;
        } else {
            $hfile = "";
        }
    } else {
        &getval($hfile, "", "$ht I cannot find the pattern\nfile for English "
         ."in your TeX installation. (It should be called\n'hyphen.tex', "
         ."or perhaps 'ushyph1.tex', somewhere in the directory\ntree "
         ."'$texdir'.)\n\nIf you know where this file is and want to use it "
         ."instead of the\nfile included with html2ps, enter the full path "
         ."name for this file,\notherwise press <return>");
        while($hfile && !-f $hfile) {
            &getval($hfile, "", "\nNo such file: $hfile\nEnter new name, or "
             ."press <return> to use the supplied file");
        }
        $cophy = $hfile !~ /\S/;
    }
    if(!$hfile) {
        if($def) {
            $hyph = "$prefix${dirsep}lib${dirsep}html2ps";
        } else {
            &getval($hyph, "$prefix${dirsep}lib${dirsep}html2ps",
             "\nOK, I will use the supplied pattern file for English. Enter "
            ."the directory\nwhere this file should be put");
            &fixdir($hyph);
        }
    }
} else {
    if($def) {
        $hyph = "$prefix${dirsep}lib${dirsep}html2ps";
    } else {
    &getval($hyph, "$prefix${dirsep}lib${dirsep}html2ps", "$ht A pattern file for English is\n"
     ."included with html2ps (see the documentation how to install pattern\n"
     ."files for other languages). Enter the directory where this file\n"
     ."should be put");
    }
}
if($cophy) {
    &makedir($hyph,0);
    $hfile = "$hyph${dirsep}hyphen.tex";
}

if($def) {
    $html = "$prefix${dirsep}lib${dirsep}html2ps";
} else {
    &getval($html, "$prefix${dirsep}lib${dirsep}html2ps",
     "\nEnter a directory where to put the HTML document describing\nhtml2ps");
    &fixdir($html);
}
&makedir($html,$def);

$paper = "";
&getval($format, "A4",
 "\nEnter the default paper type, possible choices are:\nA0, A1, A2, A3, A4,"
 ." A5, A6, A7, A8, A9, A10,\nB0, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10,\n"
 ."letter, legal, arche, archd, archc, archb, archa,\nflsa, flse, halfletter,"
 ." 11x17, ledger, other");
if($format !~ /^other$/i) {
    $paper .= "    type: $format;";
} else {
    &getval($height, "",
     "\nDefault paper height i centimeters (1 inch = 2.54 centimeters)");
    &getval($width, "", "\nDefault paper width i centimeters");
    $paper .= "    height: $height;\n";
    $paper .= "    width: $width;";
}

open(RC,">html2psrc") || die "*** Error opening html2psrc\n";
print RC "/* Global configuration file for html2ps */\n\n"
  ."\@html2ps {\n  package {\n$pack\n  }\n  paper {\n$paper\n  }\n"
  ."  hyphenation {\n    en {\n      file: \"$hfile\";\n    }\n  }\n}\n";
close RC;

undef $/;
open(HTML2PS,"html2ps") || die "*** Error opening html2ps\n";
($code = <HTML2PS>) =~ s|\$globrc=.*|\$globrc='$glob${dirsep}html2psrc';|;
$code =~ s/exec \S+/exec $^X/;
$code =~ s|\$ug=.*|\$ug='$html${dirsep}html2ps.html';|;
close HTML2PS;
open(HTML2PS,">html2ps") || die "*** Error opening html2ps\n";
print HTML2PS $code;
close HTML2PS;
chmod 0755, "html2ps";

$files = <<EOF;
.TP
$glob/html2psrc
Global configuration file. See html2psrc(5).
.TP
\$HOME/.html2psrc
User configuration file. See html2psrc(5).
.TP
$html/html2ps.html
Documentation for html2ps.
EOF

open(MAN1,"html2ps.1") || die "*** Error opening html2ps.1\n";
($code = <MAN1>) =~ s|(\.SH FILES)[\w\W]*(\.SH SEE ALSO)|$1\n$files$2|;
close MAN1;
open(MAN1,">html2ps.1") || die "*** Error opening html2ps.1\n";
print MAN1 $code;
close MAN1;

$odir = "oldfiles.$vid";
$saved = -f "backout.dat";

print "\n";
&inst($bindir,"html2ps");
if(!$saved && -f "$glob${dirsep}html2psrc") {
    $backout .= "html2psrc $glob\n";
    copy "$glob${dirsep}html2psrc" => $odir or die "*** Cannot write to $odir\n";
}
if($repl=~/^y/i) {
    print "Installing html2psrc in $glob\n";
    copy 'html2psrc' => $glob or die "*** Cannot write to $glob\n";
}
&inst($man1,"html2ps.1");
&inst($man5,"html2psrc.5");
if($cophy) {
    print "Installing hyphen.tex in $hyph\n";
    copy 'hyphen.tex' => $hyph or die "*** Cannot write to $hyph\n";
}
&inst($html,"html2ps.html");

if(!$saved && $backout) {
    open(BACKOUT,">backout.dat") || die "*** Error opening backout\n";
    print BACKOUT "$odir\n$backout";
    close BACKOUT;
}
if(-d $odir) {
    print "\nIf you are not satisfied with this version of html2ps; you can "
         ."execute\nthe script 'backout' to reinstall your earlier version.\n";
}

if($repl!~/^y/i) {
    print "\nA new global configuration file 'html2psrc' has been created in "
         ."the current\ndirectory. You can compare this with your old "
         ."configuration file to see if\nany changes need to be done.\n";
}

print "\nTesting the installation.\n"
  ."Converting the documentation file 'html2ps.html', using the configuration"
  ."\nfile 'sample'. The output will be written to 'html2ps.ps'.\n";
chmod 0755, "$bindir${dirsep}html2ps";
print `perl $bindir${dirsep}html2ps -T -f sample -o html2ps.ps $html${dirsep}html2ps.html`;
print $?? "Something went wrong...\n":
          "\nInstallation completed.\nYou may now try to print the file "
         ."'html2ps.ps' (a users guide on about\n30 pages) in the current "
         ."directory.\n";

sub exist {
    local($package,$flag) = @_;
    $program = $p{$package}? $p{$package}: $package;
    print "Searching for $package: ";
    for $dir (split(/\Q$pathsep/,$ENV{PATH})) {
        if(-f "$dir$dirsep$program" || -f "$dir$dirsep$program.exe") {
            $exist{$package} = 1;
            $dir{$package} = $dir;
            print "found ($dir$dirsep$program)\n";
            push(@reqpath,$dir) if(!grep(/^$dir$/,@reqpath) && $flag);
            $dir = $dir;
            return 1;
        }
    }
    print "not found\n";
    0;
}

sub makedir {
    while(!-d $_[0]) {
	$cre = "n";
	while(!-d $_[0] && !$_[1] && $cre!~/^(y|$)/i) {
	    &getval($cre, "y", "\nDirectory $_[0] does not exist, create?");
	    &getval($_[0], "", "\nEnter new directory name") if($cre!~/^y/i);
	    die "*** Configuration aborted\n" if($_[0] eq "");
	}
     S: while($_[0]=~/\Q$dirsep\E|$/g) {
    	    if($` && !-d $`) {
		if(mkdir($`, 0755)) {
		    print "Created directory $`\n";
		} else {
		    print "*** Error creating directory $`: $!\n";
		    &getval($_[0], "", "\nEnter new directory name");
		    die "*** Configuration aborted\n" if($_[0] eq "");
		    last S;
		}
	    }
        }
    }
}

sub fixdir {
    $_[0] = "$cd/$_[0]" if($_[0]!~/^\// && $dirsep eq '/');
    while($_[0]=~m|[^/]*/\.\./|) {$_[0] = $`.$'};
    $_[0] =~ s|/\./|/|g;
}

sub getval {
    $text = $_[1]? "$_[2] [$_[1]]": $_[2];
    print "$text: ";
    ($_[0] = <STDIN>) =~ s/^\s+|[\/\s]+$//g;
    $_[0] = $_[1] if(!$_[0]);
}
sub inst {
    if(!$saved && -f $_[0].$dirsep.$_[1]) {
        mkdir($odir,0755) || die "*** Error creating $odir\n" if(!-d $odir);
        $backout .= "$_[1] $_[0]\n";
        copy $_[0].$dirsep.$_[1] => $odir or die "*** Cannot write to $odir\n";
    }
    $from = -e $_[1]? $_[1]: $DOS{$_[1]};
    print "Installing $from in $_[0]\n";
    copy $from => $_[0].$dirsep.$_[1] or die "*** Cannot write to $_[0]\n";
}
sub goodprefix {
    for ($prefix, "$prefix${dirsep}bin", "$prefix${dirsep}lib",
	 "$prefix${dirsep}man")
    {
	if (-d $_ && !-w $_) {
	    print "*** Cannot write to directory $_\n";
	    return 0;
	}
    }
    1;
}