File Coverage

blib/lib/Mojo/Alien/webpack.pm

Criterion	Covered	Total	%
statement	36	135	26.6
branch	1	58	1.7
condition	2	32	6.2
subroutine	10	24	41.6
pod	7	7	100.0
total	56	256	21.8

package Mojo::Alien::webpack;
use Mojo::Base -base;

use Carp qw(croak);
use File::chdir;
use Mojo::Alien::npm;
use Mojo::File qw(path tempfile);
use Mojo::Loader;
use POSIX ':sys_wait_h';
use Time::HiRes qw(sleep);

use constant DEBUG => ($ENV{MOJO_ROLLUP_DEBUG} || $ENV{MOJO_WEBPACK_DEBUG}) && 1;

# TODO
our $VERSION = $Mojolicious::Plugin::Webpack::VERSION || '0.01';

has assets_dir => sub { shift->config->dirname->child('assets') };

has binary => sub {
  my $self = shift;
  return $ENV{MOJO_WEBPACK_BINARY} if $ENV{MOJO_WEBPACK_BINARY};
  my $bin = $self->config->to_abs->dirname->child(qw(node_modules .bin webpack));
  $self->_d('%s %s', -e $bin ? 'Found' : 'Not installed', $bin) if DEBUG;
  return -e $bin ? $bin->to_string : 'webpack';
};

has config => sub { path->to_abs->child('webpack.config.js') };

has dependencies => sub {
  return {
    core   => [qw(webpack webpack-cli)],
    css    => [qw(css-loader mini-css-extract-plugin css-minimizer-webpack-plugin)],
    eslint => [qw(eslint eslint-webpack-plugin)],
    js     => [qw(@babel/core @babel/preset-env @babel/plugin-transform-runtime babel-loader terser-webpack-plugin)],
    sass   => [qw(css-loader mini-css-extract-plugin css-minimizer-webpack-plugin sass sass-loader)],
    vue    => [qw(vue vue-loader vue-template-compiler)],
  };
};

has include => sub { +[] };
has mode    => sub { $ENV{NODE_ENV} || 'development' };

has npm => sub {
  my $self = shift;
  Mojo::Alien::npm->new(config => $self->config->dirname->child('package.json'), mode => $self->mode);
};

has out_dir => sub { shift->config->dirname->child('dist') };

sub asset_map {
  my $self = shift;

  my %assets;
  for my $path ($self->out_dir->list_tree->each) {
    my $rel_path = File::Spec->abs2rel($path, $self->out_dir);
    my $name     = $rel_path;
    $name =~ s!(.*)\W(\w+)\.(\w+)$!$1.$3!;    # (prefix, checksum, ext)
    my $mode = ($2 // '') eq 'development' ? 'development' : 'production';
    $assets{$rel_path} = {ext => lc $3, name => $name, mode => $mode, mtime => $path->stat->mtime, path => $path};
  }

  return \%assets;
}

sub build {
  my $self = shift;
  croak "Can't call build() after watch()" if $self->pid;

  ($!, $?) = (0, 0);
  $self->_run($self->_cmd_build);
  croak "$self->{basename} $! (exit=$?)"   if $!;
  croak "$self->{basename} failed exit=$?" if !$! and $?;

  return $self;
}

sub exec {
  my $self = shift;
  my @cmd  = ($self->_cmd_build, '--watch');
  my $home = $self->config->dirname->to_string;

  chdir $home or die "Can't chdir to $home: $!";
  $ENV{NODE_ENV}           = $self->mode;
  $ENV{WEBPACK_ASSETS_DIR} = $self->assets_dir->to_string;
  $ENV{WEBPACK_OUT_DIR}    = $self->out_dir->to_string;
  $self->_d('(%s) cd %s && %s', $$, $home, join ' ', @_) if DEBUG;
  { CORE::exec(@cmd) }
  die "Can't exec @cmd: $!";
}

sub init {
  my $self = shift;

  $self->npm->init;
  $self->_render_file($self->_config_template_name, $self->config);

  my $dependencies = $self->npm->dependencies;
  my @includes     = @{$self->include};
  unshift @includes, 'core' unless grep { $_ eq 'core' } @includes;
  my ($conf_d, @includes_names, %seen) = ($self->_config_include_dir);
  for my $include (@includes) {
    for my $package (@{$self->dependencies->{$include} || []}) {
      next if $seen{$package}++;
      $self->npm->install($package) unless $dependencies->{$package}{version};
    }

    my $exists = $self->_resources->{"include/$include.js"} ? 'exists' : 'does not exist';
    my $file   = $conf_d->child("$include.js");
    $self->_d('Template %s.js %s', $include, $exists) if DEBUG;
    $self->_render_file("include/$include.js", $file) if $exists eq 'exists';
    push @includes_names, $include if -e $file;
  }

  my $include_src = ("module.exports = function(config, opts) {\n");
  $include_src .= "  require('./$_')(config, opts);\n" for @includes_names;
  $include_src .= "};\n";
  $self->_render_file('include.js', $self->_config_include_dir->child('include.js'), $include_src);
  return $self;
}

sub pid {
  my $self = shift;
  return 0 unless $self->{pid};
  my $r = waitpid $self->{pid}, WNOHANG;    # -1 == no such process, >0 if terminated
  return $r == -1 && delete $self->{pid} ? 0 : $r ? 0 : $self->{pid};
}

sub stop {
  my ($self, $tries) = @_;

  $tries ||= 100;
  while (--$tries) {
    return $self unless my $pid = $self->pid;
    local $!;
    kill 15, $pid;
    waitpid $pid, 0;
    sleep $ENV{MOJO_WEBPACK_STOP_INTERVAL} || 0.1;
  }

  $self->{basename} ||= path($self->binary)->basename;
  croak "Couldn't stop $self->{basename} with pid @{[$self->pid]}";
}

sub watch {
  my $self = shift;
  return $self if $self->pid;

  my $home = $self->config->dirname->to_string;
  croak "Can't chdir $home: No such file or directory" unless -d $home;

  my @cmd = ($self->_cmd_build, '--watch');
  croak "Can't fork: $!" unless defined(my $pid = fork);
  return $self if $self->{pid} = $pid;    # Parent
  return $self->exec;                     # Child
}

sub _cmd_build {
  my $self = shift;
  $self->init;

  my @cmd = ($self->binary);
  croak "Can't run $cmd[0]" unless -x $cmd[0];

  $self->{basename} ||= path($cmd[0])->basename;
  push @cmd, '--config' => $self->config->to_string;
  push @cmd, qw(--progress --profile --verbose) if $ENV{MOJO_WEBPACK_VERBOSE};
  return @cmd;
}

sub _config_include_dir   { shift->assets_dir->child('webpack.config.d') }
sub _config_template_name {'webpack.config.js'}
sub _d                    { my ($class, $format) = (shift, shift); warn sprintf "[Webpack] $format\n", @_ }

sub _render_file {
  my ($self, $name, $file, $content) = @_;

  if (-e $file) {
    my $version = $file->slurp =~ m!// Autogenerated.*(\d+\.\d+)! ? $1 : -1;
    $self->_d('File %s has version %s', $file, $version) if DEBUG;
    return $self                                         if $version == -1;
    return $self if $version == $VERSION and !$content and !$ENV{MOJO_WEBPACK_REGENERATE};
  }

  $self->_d('Render %s to %s', $name, $file) if DEBUG;
  $file->dirname->make_path unless -d $file->dirname;
  $content //= $self->_resources->{$name};
  $file->spurt(sprintf "// Autogenerated by %s %s\n%s", ref($self), $VERSION, $content);
  return $self;
}

sub _resources {
  state $resources = Mojo::Loader::data_section(ref($_[0]) || $_[0]);
}

sub _run {
  my ($self, @cmd) = @_;
  local $CWD                     = $self->config->dirname->to_string;
  local $ENV{NODE_ENV}           = $self->mode;
  local $ENV{WEBPACK_ASSETS_DIR} = $self->assets_dir->to_string;
  local $ENV{WEBPACK_OUT_DIR}    = $self->out_dir->to_string;
  $self->_d('cd %s && %s', $CWD, join ' ', @cmd) if DEBUG;
  open my $WEBPACK, '-|', @cmd or die "Can't run @cmd: $!";
  return $WEBPACK if defined wantarray;
  DEBUG && print while <$WEBPACK>;
}

sub DESTROY { shift->stop }

1;

=encoding utf8

=head1 NAME

Mojo::Alien::webpack - Runs the external nodejs program webpack

=head1 SYNOPSIS

  use Mojo::Alien::webpack;
  my $webpack = Mojo::Alien::webpack->new;

  # Run once
  $webpack->build;

  # Build when webpack see files change
  $webpack->watch;

=head1 DESCRIPTION

L is a class for runnig the external nodejs program
L.

=head1 ATTRIBUTES

=head2 assets_dir

  $path = $webpack->assets_dir;
  $webpack = $webpack->assets_dir($webpack->config->dirname->child('assets'))

Location to source assetsa and partial webpack.config.js files.

=head2 binary

  $array_ref = $webpack->binary;
  $webpack = $webpack->binary('webpack');

The path to the webpack executable. Defaults to C
environment variable, or "webpack" inside "./node_modules". Fallback to just
"webpack".

=head2 config

  $path = $webpack->config;
  $webpack = $webpack->config(path->to_abs->child('webpack.config.js'));

Holds an I path to
L.

=head2 dependencies

  $hash_ref = $webpack->dependencies;

A hash where the keys can match the items in L and the values are
lists of packages to install. Keys that does I match items in L
will be ignored. This attribute will be used by L.

These dependencies are predefined:

  core   | webpack webpack-cli
  css    | css-loader mini-css-extract-plugin css-minimizer-webpack-plugin
  eslint | eslint-webpack-plugin
  js     | @babel/core @babel/preset-env @babel/plugin-transform-runtime babel-loader terser-webpack-plugin
  sass   | css-loader mini-css-extract-plugin css-minimizer-webpack-plugin sass sass-loader
  vue    | vue vue-loader vue-template-compiler

=head2 include

  $array_ref = $webpack->include;
  $webpack = $webpack->include([qw(js css)]);

L can be used to install dependencies and load other webpack config
files. The config files included must exist in the "webpack.config.d" sub
directory inside L. Here is an example of which files that will be
included if they exists:

  # Including "js" and "css" will look for the files below
  $webpack->include[qw(js css)]);

  # - assets/webpack.config.d/package-babel-loader.js
  # - assets/webpack.config.d/package-terser-webpack-plugin.js
  # - assets/webpack.config.d/package-css-loader.js
  # - assets/webpack.config.d/package-css-minimizer-webpack-plugin.js
  # - assets/webpack.config.d/js.js
  # - assets/webpack.config.d/css.js

The L feature is currently EXPERIMENTAL.

=head2 mode

  $str = $webpack->mode;
  $webpack = $webpack->mode('development');

Should be either "development" or "production". Will be used as "NODE_ENV"
environment variable when calling L or L.

=head2 npm

  $npm = $webpack->npm;

A L object used by L.

=head2 out_dir

  $path = $webpack->out_dir;
  $webpack = $webpack->out_dir(path('dist')->to_abs);

Location to write output assets to.

=head1 METHODS

=head2 asset_map

  $hash_ref = $webpack->asset_map;

Parses the filenames in L and returns a hash ref with information
about the generated assets. Example return value:

  {
    'relatibe/output.development.js' => {            # Key is relative path to out_dir()
      ext   => 'css',                                # File extension
      mode  => 'development',                        # or "production"
      mtime => 1616976114,                           # File modification epoch timestamp
      name  => 'relative/output.js',                 # Name of asset, without checksum or mode
      path  => '/path/to/entry-name.development.js', # Absolute path to asset
    },
  }

Note that this method is currently EXPERIMENTAL.

=head2 build

  $webpack->build;

Will build the assets or croaks on errors. Automatically calls L.

=head2 exec

  $webpack->exec;

This method will replace the current process, instead of starting webpack
inside a fork. This method is called by L inside a fork.

=head2 init

  $webpack = $webpack->init;

Will install "webpack" and "webpack-cli" and create a default L. Does
nothing if this is already done.

This method is automatically called by L and L.

=head2 pid

  $int = $webpack->pid;

Returns the PID of the webpack process started by L.

=head2 stop

  $webpack->stop;

Will stop the process started by L. Does nothing if L has not
been called.

=head2 watch

  $webpack->watch;

Forks a new process that runs "webpack watch". This means that any changes will
generate new assets. This is much more efficient than calling L over
and over again. Automatically calls L.

=head1 SEE ALSO

L and L.

=cut

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