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#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0-or-later
use strict;

# Copyright (c) 2017-2020 Mauro Carvalho Chehab <mchehab@kernel.org>
#

my $prefix = "./";
$prefix = "$ENV{'srctree'}/" if ($ENV{'srctree'});

my $conf = $prefix . "Documentation/conf.py";
my $requirement_file = $prefix . "Documentation/sphinx/requirements.txt";
my $virtenv_prefix = "sphinx_";

#
# Static vars
#

my %missing;
my $system_release;
my $need = 0;
my $optional = 0;
my $need_symlink = 0;
my $need_sphinx = 0;
my $need_pip = 0;
my $need_virtualenv = 0;
my $rec_sphinx_upgrade = 0;
my $verbose_warn_install = 1;
my $install = "";
my $virtenv_dir = "";
my $python_cmd = "";
my $activate_cmd;
my $min_version;
my $cur_version;
my $rec_version = "3.4.3";
my $latest_avail_ver;

#
# Command line arguments
#

my $pdf = 1;
my $virtualenv = 1;
my $version_check = 0;

#
# List of required texlive packages on Fedora and OpenSuse
#

my %texlive = (
'amsfonts.sty'       => 'texlive-amsfonts',
'amsmath.sty'        => 'texlive-amsmath',
'amssymb.sty'        => 'texlive-amsfonts',
'amsthm.sty'         => 'texlive-amscls',
'anyfontsize.sty'    => 'texlive-anyfontsize',
'atbegshi.sty'       => 'texlive-oberdiek',
'bm.sty'             => 'texlive-tools',
'capt-of.sty'        => 'texlive-capt-of',
'cmap.sty'           => 'texlive-cmap',
'ecrm1000.tfm'       => 'texlive-ec',
'eqparbox.sty'       => 'texlive-eqparbox',
'eu1enc.def'         => 'texlive-euenc',
'fancybox.sty'       => 'texlive-fancybox',
'fancyvrb.sty'       => 'texlive-fancyvrb',
'float.sty'          => 'texlive-float',
'fncychap.sty'       => 'texlive-fncychap',
'footnote.sty'       => 'texlive-mdwtools',
'framed.sty'         => 'texlive-framed',
'luatex85.sty'       => 'texlive-luatex85',
'multirow.sty'       => 'texlive-multirow',
'needspace.sty'      => 'texlive-needspace',
'palatino.sty'       => 'texlive-psnfss',
'parskip.sty'        => 'texlive-parskip',
'polyglossia.sty'    => 'texlive-polyglossia',
'tabulary.sty'       => 'texlive-tabulary',
'threeparttable.sty' => 'texlive-threeparttable',
'titlesec.sty'       => 'texlive-titlesec',
'ucs.sty'            => 'texlive-ucs',
'upquote.sty'        => 'texlive-upquote',
'wrapfig.sty'        => 'texlive-wrapfig',
'ctexhook.sty'       => 'texlive-ctex',
);

#
# Subroutines that checks if a feature exists
#

sub check_missing(%)
{
my %map = %{$_[0]};

foreach my $prog (sort keys %missing) {
  my $is_optional = $missing{$prog};

  # At least on some LTS distros like CentOS 7, texlive doesn't
  # provide all packages we need. When such distros are
  # detected, we have to disable PDF output.
  #
  # So, we need to ignore the packages that distros would
  # need for LaTeX to work
  if ($is_optional == 2 && !$pdf) {
   $optional--;
   next;
  }

  if ($verbose_warn_install) {
   if ($is_optional) {
    print "Warning: better to also install \"$prog\".\n";
   } else {
    print "ERROR: please install \"$prog\", otherwise, build won't work.\n";
   }
  }
  if (defined($map{$prog})) {
   $install .= " " . $map{$prog};
  } else {
   $install .= " " . $prog;
  }
}

$install =~ s/^\s//;
}

sub add_package($$)
{
my $package = shift;
my $is_optional = shift;

$missing{$package} = $is_optional;
if ($is_optional) {
  $optional++;
} else {
  $need++;
}
}

sub check_missing_file($$$)
{
my $files = shift;
my $package = shift;
my $is_optional = shift;

for (@$files) {
  return if(-e $_);
}

add_package($package, $is_optional);
}

sub findprog($)
{
foreach(split(/:/, $ENV{PATH})) {
  return "$_/$_[0]" if(-x "$_/$_[0]");
}
}

sub find_python_no_venv()
{
my $prog = shift;

my $cur_dir = qx(pwd);
$cur_dir =~ s/\s+$//;

foreach my $dir (split(/:/, $ENV{PATH})) {
  next if ($dir =~ m,($cur_dir)/sphinx,);
  return "$dir/python3" if(-x "$dir/python3");
}
foreach my $dir (split(/:/, $ENV{PATH})) {
  next if ($dir =~ m,($cur_dir)/sphinx,);
  return "$dir/python" if(-x "$dir/python");
}
return "python";
}

sub check_program($$)
{
my $prog = shift;
my $is_optional = shift;

return $prog if findprog($prog);

add_package($prog, $is_optional);
}

sub check_perl_module($$)
{
my $prog = shift;
my $is_optional = shift;

my $err = system("perl -M$prog -e 1 2>/dev/null /dev/null");
return if ($err == 0);

add_package($prog, $is_optional);
}

sub check_python_module($$)
{
my $prog = shift;
my $is_optional = shift;

return if (!$python_cmd);

my $err = system("$python_cmd -c 'import $prog' 2>/dev/null /dev/null");
return if ($err == 0);

add_package($prog, $is_optional);
}

sub check_rpm_missing($$)
{
my @pkgs = @{$_[0]};
my $is_optional = $_[1];

foreach my $prog(@pkgs) {
  my $err = system("rpm -q '$prog' 2>/dev/null >/dev/null");
  add_package($prog, $is_optional) if ($err);
}
}

sub check_pacman_missing($$)
{
my @pkgs = @{$_[0]};
my $is_optional = $_[1];

foreach my $prog(@pkgs) {
  my $err = system("pacman -Q '$prog' 2>/dev/null >/dev/null");
  add_package($prog, $is_optional) if ($err);
}
}

sub check_missing_tex($)
{
my $is_optional = shift;
my $kpsewhich = findprog("kpsewhich");

foreach my $prog(keys %texlive) {
  my $package = $texlive{$prog};
  if (!$kpsewhich) {
   add_package($package, $is_optional);
   next;
  }
  my $file = qx($kpsewhich $prog);
  add_package($package, $is_optional) if ($file =~ /^\s*$/);
}
}

sub get_sphinx_fname()
{
if ($ENV{'SPHINXBUILD'}) {
     return $ENV{'SPHINXBUILD'};
}

my $fname = "sphinx-build";
return $fname if findprog($fname);

$fname = "sphinx-build-3";
if (findprog($fname)) {
  $need_symlink = 1;
  return $fname;
}

return "";
}

sub get_sphinx_version($)
{
my $cmd = shift;
my $ver;

open IN, "$cmd --version 2>&1 |";
while (<IN>) {
  if (m/^\s*sphinx-build\s+([\d\.]+)((\+\/[\da-f]+)|(b\d+))?$/) {
   $ver=$1;
   last;
  }
  # Sphinx 1.2.x uses a different format
  if (m/^\s*Sphinx.*\s+([\d\.]+)$/) {
   $ver=$1;
   last;
  }
}
close IN;
return $ver;
}

sub check_sphinx()
{
open IN, $conf or die "Can't open $conf";
while (<IN>) {
  if (m/^\s*needs_sphinx\s*=\s*[\'\"]([\d\.]+)[\'\"]/) {
   $min_version=$1;
   last;
  }
}
close IN;

die "Can't get needs_sphinx version from $conf" if (!$min_version);

$virtenv_dir = $virtenv_prefix . "latest";

my $sphinx = get_sphinx_fname();
if ($sphinx eq "") {
  $need_sphinx = 1;
  return;
}

$cur_version = get_sphinx_version($sphinx);
die "$sphinx didn't return its version" if (!$cur_version);

if ($cur_version lt $min_version) {
  printf "ERROR: Sphinx version is %s. It should be >= %s\n",
         $cur_version, $min_version;
  $need_sphinx = 1;
  return;
}

return if ($cur_version lt $rec_version);

# On version check mode, just assume Sphinx has all mandatory deps
exit (0) if ($version_check);
}

#
# Ancillary subroutines
#

sub catcheck($)
{
  my $res = "";
  $res = qx(cat $_[0]) if (-r $_[0]);
  return $res;
}

sub which($)
{
my $file = shift;
my @path = split ":", $ENV{PATH};

foreach my $dir(@path) {
  my $name = $dir.'/'.$file;
  return $name if (-x $name );
}
return undef;
}

#
# Subroutines that check distro-specific hints
#

sub give_debian_hints()
{
my %map = (
  "python-sphinx"  => "python3-sphinx",
  "yaml"   => "python3-yaml",
  "ensurepip"  => "python3-venv",
  "virtualenv"  => "virtualenv",
  "dot"   => "graphviz",
  "convert"  => "imagemagick",
  "Pod::Usage"  => "perl-modules",
  "xelatex"  => "texlive-xetex",
  "rsvg-convert"  => "librsvg2-bin",
);

if ($pdf) {
  check_missing_file(["/usr/share/texlive/texmf-dist/tex/latex/ctex/ctexhook.sty"],
       "texlive-lang-chinese", 2);

  check_missing_file(["/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"],
       "fonts-dejavu", 2);

  check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc",
        "/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
        "/usr/share/fonts/opentype/noto/NotoSerifCJK-Regular.ttc"],
       "fonts-noto-cjk", 2);
}

check_program("dvipng", 2) if ($pdf);
check_missing(\%map);

return if (!$need && !$optional);
printf("You should run:\n") if ($verbose_warn_install);
printf("\n\tsudo apt-get install $install\n");
}

sub give_redhat_hints()
{
my %map = (
  "python-sphinx"  => "python3-sphinx",
  "yaml"   => "python3-pyyaml",
  "virtualenv"  => "python3-virtualenv",
  "dot"   => "graphviz",
  "convert"  => "ImageMagick",
  "Pod::Usage"  => "perl-Pod-Usage",
  "xelatex"  => "texlive-xetex-bin",
  "rsvg-convert"  => "librsvg2-tools",
);

my @fedora26_opt_pkgs = (
  "graphviz-gd",  # Fedora 26: needed for PDF support
);

my @fedora_tex_pkgs = (
  "texlive-collection-fontsrecommended",
  "texlive-collection-latex",
  "texlive-xecjk",
  "dejavu-sans-fonts",
  "dejavu-serif-fonts",
  "dejavu-sans-mono-fonts",
);

#
# Checks valid for RHEL/CentOS version 7.x.
#
my $old = 0;
my $rel;
my $noto_sans_redhat = "google-noto-sans-cjk-ttc-fonts";
$rel = $1 if ($system_release =~ /(release|Linux)\s+(\d+)/);

if (!($system_release =~ /Fedora/)) {
  $map{"virtualenv"} = "python-virtualenv";

  if ($rel && $rel < 8) {
   $old = 1;
   $pdf = 0;

   printf("Note: texlive packages on RHEL/CENTOS <= 7 are incomplete. Can't support PDF output\n");
   printf("If you want to build PDF, please read:\n");
   printf("\thttps://www.systutorials.com/241660/how-to-install-tex-live-on-centos-7-linux/\n");
  }
} else {
  if ($rel && $rel < 26) {
   $old = 1;
  }
  if ($rel && $rel >= 38) {
   $noto_sans_redhat = "google-noto-sans-cjk-fonts";
  }
}
if (!$rel) {
  printf("Couldn't identify release number\n");
  $old = 1;
  $pdf = 0;
}

if ($pdf) {
  check_missing_file(["/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc",
        "/usr/share/fonts/google-noto-sans-cjk-fonts/NotoSansCJK-Regular.ttc"],
       $noto_sans_redhat, 2);
}

check_rpm_missing(\@fedora26_opt_pkgs, 2) if ($pdf && !$old);
check_rpm_missing(\@fedora_tex_pkgs, 2) if ($pdf);
check_missing_tex(2) if ($pdf);
check_missing(\%map);

return if (!$need && !$optional);

if (!$old) {
  # dnf, for Fedora 18+
  printf("You should run:\n") if ($verbose_warn_install);
  printf("\n\tsudo dnf install -y $install\n");
} else {
  # yum, for RHEL (and clones) or Fedora version < 18
  printf("You should run:\n") if ($verbose_warn_install);
  printf("\n\tsudo yum install -y $install\n");
}
}

sub give_opensuse_hints()
{
my %map = (
  "python-sphinx"  => "python3-sphinx",
  "yaml"   => "python3-pyyaml",
  "virtualenv"  => "python3-virtualenv",
  "dot"   => "graphviz",
  "convert"  => "ImageMagick",
  "Pod::Usage"  => "perl-Pod-Usage",
  "xelatex"  => "texlive-xetex-bin",
);

# On Tumbleweed, this package is also named rsvg-convert
$map{"rsvg-convert"} = "rsvg-view" if (!($system_release =~ /Tumbleweed/));

my @suse_tex_pkgs = (
  "texlive-babel-english",
  "texlive-caption",
  "texlive-colortbl",
  "texlive-courier",
  "texlive-dvips",
  "texlive-helvetic",
  "texlive-makeindex",
  "texlive-metafont",
  "texlive-metapost",
  "texlive-palatino",
  "texlive-preview",
  "texlive-times",
  "texlive-zapfchan",
  "texlive-zapfding",
);

$map{"latexmk"} = "texlive-latexmk-bin";

# FIXME: add support for installing CJK fonts
#
# I tried hard, but was unable to find a way to install
# "Noto Sans CJK SC" on openSUSE

check_rpm_missing(\@suse_tex_pkgs, 2) if ($pdf);
check_missing_tex(2) if ($pdf);
check_missing(\%map);

return if (!$need && !$optional);
printf("You should run:\n") if ($verbose_warn_install);
printf("\n\tsudo zypper install --no-recommends $install\n");
}

sub give_mageia_hints()
{
my %map = (
  "python-sphinx"  => "python3-sphinx",
  "yaml"   => "python3-yaml",
  "virtualenv"  => "python3-virtualenv",
  "dot"   => "graphviz",
  "convert"  => "ImageMagick",
  "Pod::Usage"  => "perl-Pod-Usage",
  "xelatex"  => "texlive",
  "rsvg-convert"  => "librsvg2",
);

my @tex_pkgs = (
  "texlive-fontsextra",
);

$map{"latexmk"} = "texlive-collection-basic";

my $packager_cmd;
my $noto_sans;
if ($system_release =~ /OpenMandriva/) {
  $packager_cmd = "dnf install";
  $noto_sans = "noto-sans-cjk-fonts";
  @tex_pkgs = ( "texlive-collection-fontsextra" );
} else {
  $packager_cmd = "urpmi";
  $noto_sans = "google-noto-sans-cjk-ttc-fonts";
}

if ($pdf) {
  check_missing_file(["/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc",
        "/usr/share/fonts/TTF/NotoSans-Regular.ttf"],
       $noto_sans, 2);
}

check_rpm_missing(\@tex_pkgs, 2) if ($pdf);
check_missing(\%map);

return if (!$need && !$optional);
printf("You should run:\n") if ($verbose_warn_install);
printf("\n\tsudo $packager_cmd $install\n");
}

sub give_arch_linux_hints()
{
my %map = (
  "yaml"   => "python-yaml",
  "virtualenv"  => "python-virtualenv",
  "dot"   => "graphviz",
  "convert"  => "imagemagick",
  "xelatex"  => "texlive-xetex",
  "latexmk"  => "texlive-core",
  "rsvg-convert"  => "extra/librsvg",
);

my @archlinux_tex_pkgs = (
  "texlive-core",
  "texlive-latexextra",
  "ttf-dejavu",
);
check_pacman_missing(\@archlinux_tex_pkgs, 2) if ($pdf);

if ($pdf) {
  check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc"],
       "noto-fonts-cjk", 2);
}

check_missing(\%map);

return if (!$need && !$optional);
printf("You should run:\n") if ($verbose_warn_install);
printf("\n\tsudo pacman -S $install\n");
}

sub give_gentoo_hints()
{
my %map = (
  "yaml"   => "dev-python/pyyaml",
  "virtualenv"  => "dev-python/virtualenv",
  "dot"   => "media-gfx/graphviz",
  "convert"  => "media-gfx/imagemagick",
  "xelatex"  => "dev-texlive/texlive-xetex media-fonts/dejavu",
  "rsvg-convert"  => "gnome-base/librsvg",
);

check_missing_file(["/usr/share/fonts/dejavu/DejaVuSans.ttf"],
      "media-fonts/dejavu", 2) if ($pdf);

if ($pdf) {
  check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJKsc-Regular.otf",
        "/usr/share/fonts/noto-cjk/NotoSerifCJK-Regular.ttc"],
       "media-fonts/noto-cjk", 2);
}

check_missing(\%map);

return if (!$need && !$optional);

printf("You should run:\n") if ($verbose_warn_install);
printf("\n");

my $imagemagick = "media-gfx/imagemagick svg png";
my $cairo = "media-gfx/graphviz cairo pdf";
my $portage_imagemagick = "/etc/portage/package.use/imagemagick";
my $portage_cairo = "/etc/portage/package.use/graphviz";

if (qx(grep imagemagick $portage_imagemagick 2>/dev/null) eq "") {
  printf("\tsudo su -c 'echo \"$imagemagick\" > $portage_imagemagick'\n")
}
if (qx(grep graphviz $portage_cairo 2>/dev/null) eq  "") {
  printf("\tsudo su -c 'echo \"$cairo\" > $portage_cairo'\n");
}

printf("\tsudo emerge --ask $install\n");

}

sub check_distros()
{
# Distro-specific hints
if ($system_release =~ /Red Hat Enterprise Linux/) {
  give_redhat_hints;
  return;
}
if ($system_release =~ /CentOS/) {
  give_redhat_hints;
  return;
}
if ($system_release =~ /Scientific Linux/) {
  give_redhat_hints;
  return;
}
if ($system_release =~ /Oracle Linux Server/) {
  give_redhat_hints;
  return;
}
if ($system_release =~ /Fedora/) {
  give_redhat_hints;
  return;
}
if ($system_release =~ /Ubuntu/) {
  give_debian_hints;
  return;
}
if ($system_release =~ /Debian/) {
  give_debian_hints;
  return;
}
if ($system_release =~ /openSUSE/) {
  give_opensuse_hints;
  return;
}
if ($system_release =~ /Mageia/) {
  give_mageia_hints;
  return;
}
if ($system_release =~ /OpenMandriva/) {
  give_mageia_hints;
  return;
}
if ($system_release =~ /Arch Linux/) {
  give_arch_linux_hints;
  return;
}
if ($system_release =~ /Gentoo/) {
  give_gentoo_hints;
  return;
}

#
# Fall-back to generic hint code for other distros
# That's far from ideal, specially for LaTeX dependencies.
#
my %map = (
  "sphinx-build" => "sphinx"
);
check_missing_tex(2) if ($pdf);
check_missing(\%map);
print "I don't know distro $system_release.\n";
print "So, I can't provide you a hint with the install procedure.\n";
print "There are likely missing dependencies.\n";
}

#
# Common dependencies
#

sub deactivate_help()
{
printf "\n    If you want to exit the virtualenv, you can use:\n";
printf "\tdeactivate\n";
}

sub get_virtenv()
{
my $ver;
my $min_activate = "$ENV{'PWD'}/${virtenv_prefix}${min_version}/bin/activate";
my @activates = glob "$ENV{'PWD'}/${virtenv_prefix}*/bin/activate";

@activates = sort {$b cmp $a} @activates;

foreach my $f (@activates) {
  next if ($f lt $min_activate);

  my $sphinx_cmd = $f;
  $sphinx_cmd =~ s/activate/sphinx-build/;
  next if (! -f $sphinx_cmd);

  my $ver = get_sphinx_version($sphinx_cmd);

  if (!$ver) {
   $f =~ s#/bin/activate##;
   print("Warning: virtual environment $f is not working.\nPython version upgrade? Remove it with:\n\n\trm -rf $f\n\n");
  }

  if ($need_sphinx && ($ver ge $min_version)) {
   return ($f, $ver);
  } elsif ($ver gt $cur_version) {
   return ($f, $ver);
  }
}
return ("", "");
}

sub recommend_sphinx_upgrade()
{
my $venv_ver;

# Avoid running sphinx-builds from venv if $cur_version is good
if ($cur_version && ($cur_version ge $rec_version)) {
  $latest_avail_ver = $cur_version;
  return;
}

# Get the highest version from sphinx_*/bin/sphinx-build and the
# corresponding command to activate the venv/virtenv
($activate_cmd, $venv_ver) = get_virtenv();

# Store the highest version from Sphinx existing virtualenvs
if (($activate_cmd ne "") && ($venv_ver gt $cur_version)) {
  $latest_avail_ver = $venv_ver;
} else {
  $latest_avail_ver = $cur_version if ($cur_version);
}

# As we don't know package version of Sphinx, and there's no
# virtual environments, don't check if upgrades are needed
if (!$virtualenv) {
  return if (!$latest_avail_ver);
}

# Either there are already a virtual env or a new one should be created
$need_pip = 1;

return if (!$latest_avail_ver);

# Return if the reason is due to an upgrade or not
if ($latest_avail_ver lt $rec_version) {
  $rec_sphinx_upgrade = 1;
}

return $latest_avail_ver;
}

#
# The logic here is complex, as it have to deal with different versions:
# - minimal supported version;
# - minimal PDF version;
# - recommended version.
# It also needs to work fine with both distro's package and venv/virtualenv
sub recommend_sphinx_version($)
{
my $virtualenv_cmd = shift;

# Version is OK. Nothing to do.
if ($cur_version && ($cur_version ge $rec_version)) {
  return;
};

if (!$need_sphinx) {
  # sphinx-build is present and its version is >= $min_version

  #only recommend enabling a newer virtenv version if makes sense.
  if ($latest_avail_ver gt $cur_version) {
   printf "\nYou may also use the newer Sphinx version $latest_avail_ver with:\n";
   printf "\tdeactivate\n"  if ($ENV{'PWD'} =~ /${virtenv_prefix}/);
   printf "\t. $activate_cmd\n";
   deactivate_help();

   return;
  }
  return if ($latest_avail_ver ge $rec_version);
}

if (!$virtualenv) {
  # No sphinx either via package or via virtenv. As we can't
  # Compare the versions here, just return, recommending the
  # user to install it from the package distro.
  return if (!$latest_avail_ver);

  # User doesn't want a virtenv recommendation, but he already
  # installed one via virtenv with a newer version.
  # So, print commands to enable it
  if ($latest_avail_ver gt $cur_version) {
   printf "\nYou may also use the Sphinx virtualenv version $latest_avail_ver with:\n";
   printf "\tdeactivate\n"  if ($ENV{'PWD'} =~ /${virtenv_prefix}/);
   printf "\t. $activate_cmd\n";
   deactivate_help();

   return;
  }
  print "\n";
} else {
  $need++ if ($need_sphinx);
}

# Suggest newer versions if current ones are too old
if ($latest_avail_ver && $latest_avail_ver ge $min_version) {
  # If there's a good enough version, ask the user to enable it
  if ($latest_avail_ver ge $rec_version) {
   printf "\nNeed to activate Sphinx (version $latest_avail_ver) on virtualenv with:\n";
   printf "\t. $activate_cmd\n";
   deactivate_help();

   return;
  }

  # Version is above the minimal required one, but may be
  # below the recommended one. So, print warnings/notes

  if ($latest_avail_ver lt $rec_version) {
   print "Warning: It is recommended at least Sphinx version $rec_version.\n";
  }
}

# At this point, either it needs Sphinx or upgrade is recommended,
# both via pip

if ($rec_sphinx_upgrade) {
  if (!$virtualenv) {
   print "Instead of install/upgrade Python Sphinx pkg, you could use pip/pypi with:\n\n";
  } else {
   print "To upgrade Sphinx, use:\n\n";
  }
} else {
  print "\nSphinx needs to be installed either:\n1) via pip/pypi with:\n\n";
}

$python_cmd = find_python_no_venv();

printf "\t$virtualenv_cmd $virtenv_dir\n";

printf "\t. $virtenv_dir/bin/activate\n";
printf "\tpip install -r $requirement_file\n";
deactivate_help();

printf "\n2) As a package with:\n";

my $old_need = $need;
my $old_optional = $optional;
%missing = ();
$pdf = 0;
$optional = 0;
$install = "";
$verbose_warn_install = 0;

add_package("python-sphinx", 0);

check_distros();

$need = $old_need;
$optional = $old_optional;

printf "\n    Please note that Sphinx >= 3.0 will currently produce false-positive\n";
printf "   warning when the same name is used for more than one type (functions,\n";
printf "   structs, enums,...). This is known Sphinx bug. For more details, see:\n";
printf "\thttps://github.com/sphinx-doc/sphinx/pull/8313\n";
}

sub check_needs()
{
# Check if Sphinx is already accessible from current environment
check_sphinx();

if ($system_release) {
  print "Detected OS: $system_release.\n";
} else {
  print "Unknown OS\n";
}
printf "Sphinx version: %s\n\n", $cur_version if ($cur_version);

# Check python command line, trying first python3
$python_cmd = findprog("python3");
$python_cmd = check_program("python", 0) if (!$python_cmd);

# Check the type of virtual env, depending on Python version
if ($python_cmd) {
  if ($virtualenv) {
   my $tmp = qx($python_cmd --version 2>&1);
   if ($tmp =~ m/(\d+\.)(\d+\.)/) {
    if ($1 < 3) {
     # Fail if it finds python2 (or worse)
     die "Python 3 is required to build the kernel docs\n";
    }
    if ($1 == 3 && $2 < 3) {
     # Need Python 3.3 or upper for venv
     $need_virtualenv = 1;
    }
   } else {
    die "Warning: couldn't identify $python_cmd version!";
   }
  } else {
   add_package("python-sphinx", 0);
  }
}

my $venv_ver = recommend_sphinx_upgrade();

my $virtualenv_cmd;

if ($need_pip) {
  # Set virtualenv command line, if python < 3.3
  if ($need_virtualenv) {
   $virtualenv_cmd = findprog("virtualenv-3");
   $virtualenv_cmd = findprog("virtualenv-3.5") if (!$virtualenv_cmd);
   if (!$virtualenv_cmd) {
    check_program("virtualenv", 0);
    $virtualenv_cmd = "virtualenv";
   }
  } else {
   $virtualenv_cmd = "$python_cmd -m venv";
   check_python_module("ensurepip", 0);
  }
}

# Check for needed programs/tools
check_perl_module("Pod::Usage", 0);
check_python_module("yaml", 0);
check_program("make", 0);
check_program("gcc", 0);
check_program("dot", 1);
check_program("convert", 1);

# Extra PDF files - should use 2 for is_optional
check_program("xelatex", 2) if ($pdf);
check_program("rsvg-convert", 2) if ($pdf);
check_program("latexmk", 2) if ($pdf);

# Do distro-specific checks and output distro-install commands
check_distros();

if (!$python_cmd) {
  if ($need == 1) {
   die "Can't build as $need mandatory dependency is missing";
  } elsif ($need) {
   die "Can't build as $need mandatory dependencies are missing";
  }
}

# Check if sphinx-build is called sphinx-build-3
if ($need_symlink) {
  printf "\tsudo ln -sf %s /usr/bin/sphinx-build\n\n",
         which("sphinx-build-3");
}

recommend_sphinx_version($virtualenv_cmd);
printf "\n";

print "All optional dependencies are met.\n" if (!$optional);

if ($need == 1) {
  die "Can't build as $need mandatory dependency is missing";
} elsif ($need) {
  die "Can't build as $need mandatory dependencies are missing";
}

print "Needed package dependencies are met.\n";
}

#
# Main
#

while (@ARGV) {
my $arg = shift(@ARGV);

if ($arg eq "--no-virtualenv") {
  $virtualenv = 0;
} elsif ($arg eq "--no-pdf"){
  $pdf = 0;
} elsif ($arg eq "--version-check"){
  $version_check = 1;
} else {
  print "Usage:\n\t$0 <--no-virtualenv> <--no-pdf> <--version-check>\n\n";
  print "Where:\n";
  print "\t--no-virtualenv\t- Recommend installing Sphinx instead of using a virtualenv\n";
  print "\t--version-check\t- if version is compatible, don't check for missing dependencies\n";
  print "\t--no-pdf\t- don't check for dependencies required to build PDF docs\n\n";
  exit -1;
}
}

#
# Determine the system type. There's no standard unique way that would
# work with all distros with a minimal package install. So, several
# methods are used here.
#
# By default, it will use lsb_release function. If not available, it will
# fail back to reading the known different places where the distro name
# is stored
#

$system_release = qx(lsb_release -d) if which("lsb_release");
$system_release =~ s/Description:\s*// if ($system_release);
$system_release = catcheck("/etc/system-release") if !$system_release;
$system_release = catcheck("/etc/redhat-release") if !$system_release;
$system_release = catcheck("/etc/lsb-release") if !$system_release;
$system_release = catcheck("/etc/gentoo-release") if !$system_release;

# This seems more common than LSB these days
if (!$system_release) {
my %os_var;
if (open IN, "cat /etc/os-release|") {
  while (<IN>) {
   if (m/^([\w\d\_]+)=\"?([^\"]*)\"?\n/) {
    $os_var{$1}=$2;
   }
  }
  $system_release = $os_var{"NAME"};
  if (defined($os_var{"VERSION_ID"})) {
   $system_release .= " " . $os_var{"VERSION_ID"} if (defined($os_var{"VERSION_ID"}));
  } else {
   $system_release .= " " . $os_var{"VERSION"};
  }
}
}
$system_release = catcheck("/etc/issue") if !$system_release;
$system_release =~ s/\s+$//;

check_needs;

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