#!/usr/bin/env python3

# Copyright 2022 Ben Vanik. All Rights Reserved.

"""Main build script and tooling for xenia.

Run with --help or no arguments for possible commands.
"""
from __future__ import print_function
from datetime import datetime
import argparse
import json
import os
import re
import shutil
import subprocess
import sys

__author__ = 'ben.vanik@gmail.com (Ben Vanik)'


self_path = os.path.dirname(os.path.abspath(__file__))


# Detect if building on Android via Termux.
host_linux_platform_is_android = False
if sys.platform == 'linux':
    try:
        host_linux_platform_is_android = subprocess.Popen(
            ['uname', '-o'], stdout=subprocess.PIPE, stderr=subprocess.DEVNULL,
            universal_newlines=True).communicate()[0] == 'Android\n'
    except Exception:
        pass


def import_subprocess_environment(args):
    popen = subprocess.Popen(
        args, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True)
    variables, _ = popen.communicate()
    envvars_to_save = (
        'devenvdir',
        'include',
        'lib',
        'libpath',
        'path',
        'pathext',
        'systemroot',
        'temp',
        'tmp',
        'windowssdkdir',
        )
    for line in variables.splitlines():
        for envvar in envvars_to_save:
            if re.match(envvar + '=', line.lower()):
                var, setting = line.split('=', 1)
                if envvar == 'path':
                    setting = os.path.dirname(sys.executable) + os.pathsep + setting
                os.environ[var.upper()] = setting
                break


def import_vs_environment():
    """Finds the installed Visual Studio version and imports
    interesting environment variables into os.environ.

    Returns:
      A version such as 2015 or None if no installation is found.
    """

    if sys.platform != 'win32':
        return None

    version = 0
    install_path = None
    env_tool_args = None

    vswhere = subprocess.check_output(
        'third_party/vswhere/vswhere.exe -version "[15,)" -latest -prerelease -format json -utf8 -products '
        "Microsoft.VisualStudio.Product.Enterprise "
        "Microsoft.VisualStudio.Product.Professional "
        "Microsoft.VisualStudio.Product.Community "
        "Microsoft.VisualStudio.Product.BuildTools",
        shell=False,
        universal_newlines=True,
        encoding="utf-8",
    )
    if vswhere:
        vswhere = json.loads(vswhere)
    if vswhere and len(vswhere) > 0:
        version = int(vswhere[0].get("catalog", {}).get("productLineVersion", 2017))
        install_path = vswhere[0].get("installationPath", None)

    if version < 2017:
        if 'VS140COMNTOOLS' in os.environ:
            version = 2015
            vcvars_path = os.environ['VS140COMNTOOLS']
            vcvars_path = os.path.join(vcvars_path, '..\\..\\vc\\vcvarsall.bat')
            env_tool_args = [vcvars_path, 'x64', '&&', 'set']
    else:
        vsdevcmd_path = os.path.join(install_path, 'Common7\\Tools\\VsDevCmd.bat')
        if os.path.isfile(vsdevcmd_path) and os.access(vsdevcmd_path, os.X_OK):
            env_tool_args = [vsdevcmd_path, '-arch=amd64', '-host_arch=amd64', '&&', 'set']
        else:
            vcvars_path = os.path.join(install_path, 'VC\\Auxiliary\\Build\\vcvarsall.bat')
            env_tool_args = [vcvars_path, 'x64', '&&', 'set']

    if version == 0:
        return None

    import_subprocess_environment(env_tool_args)
    os.environ['VSVERSION'] = str(version)
    return version


vs_version = import_vs_environment()


def main():
    # Add self to the root search path.
    sys.path.insert(0, self_path)

    # Augment path to include our fancy things.
    os.environ['PATH'] += os.pathsep + os.pathsep.join([
        self_path,
        os.path.abspath(os.path.join('tools', 'build')),
        ])

    # Check git exists.
    if not has_bin('git'):
        print('WARNING: Git should be installed and on PATH. Version info will be omitted from all binaries!')
        print('')
    elif not git_is_repository():
        print('WARNING: The source tree is unversioned. Version info will be omitted from all binaries!')
        print('')

    # Check python version.
    if not sys.version_info[:2] >= (3, 6):
        print('ERROR: Python 3.6+ must be installed and on PATH')
        sys.exit(1)

    # Grab Visual Studio version and execute shell to set up environment.
    if sys.platform == 'win32' and vs_version is None:
        print('WARNING: Visual Studio not found!')
        print('Building for Windows will not be supported.')
        print('Please refer to the building guide:')
        print('https://github.com/xenia-project/xenia/blob/master/docs/building.md')

    # Setup main argument parser and common arguments.
    parser = argparse.ArgumentParser(prog='xenia-build')

    # Grab all commands and populate the argument parser for each.
    subparsers = parser.add_subparsers(title='subcommands',
                                       dest='subcommand')
    commands = discover_commands(subparsers)

    # If the user passed no args, die nicely.
    if len(sys.argv) == 1:
        parser.print_help()
        sys.exit(1)

    # Gather any arguments that we want to pass to child processes.
    command_args = sys.argv[1:]
    pass_args = []
    try:
        pass_index = command_args.index('--')
        pass_args = command_args[pass_index + 1:]
        command_args = command_args[:pass_index]
    except Exception:
        pass

    # Parse command name and dispatch.
    args = vars(parser.parse_args(command_args))
    command_name = args['subcommand']
    try:
        command = commands[command_name]
        return_code = command.execute(args, pass_args, os.getcwd())
    except Exception:
        raise
    sys.exit(return_code)


def print_box(msg):
    """Prints an important message inside a box
    """
    print(
        '┌{0:─^{2}}╖\n'
        '│{1: ^{2}}║\n'
        '╘{0:═^{2}}╝\n'
        .format('', msg, len(msg) + 2))


def has_bin(binary):
    """Checks whether the given binary is present.

    Args:
      binary: binary name (without .exe, etc).

    Returns:
      True if the binary exists.
    """
    bin_path = get_bin(binary)
    if not bin_path:
        return False
    return True


def get_bin(binary):
    """Checks whether the given binary is present and returns the path.

    Args:
      binary: binary name (without .exe, etc).

    Returns:
      Full path to the binary or None if not found.
    """
    for path in os.environ['PATH'].split(os.pathsep):
        path = path.strip('"')
        exe_file = os.path.join(path, binary)
        if os.path.isfile(exe_file) and os.access(exe_file, os.X_OK):
            return exe_file
        exe_file += '.exe'
        if os.path.isfile(exe_file) and os.access(exe_file, os.X_OK):
            return exe_file
    return None


def shell_call(command, throw_on_error=True, stdout_path=None, stderr_path=None, shell=False):
    """Executes a shell command.

    Args:
      command: Command to execute, as a list of parameters.
      throw_on_error: Whether to throw an error or return the status code.
      stdout_path: File path to write stdout output to.
      stderr_path: File path to write stderr output to.

    Returns:
      If throw_on_error is False the status code of the call will be returned.
    """
    stdout_file = None
    if stdout_path:
        stdout_file = open(stdout_path, 'w')
    stderr_file = None
    if stderr_path:
        stderr_file = open(stderr_path, 'w')
    result = 0
    try:
        if throw_on_error:
            result = 1
            subprocess.check_call(command, shell=shell, stdout=stdout_file, stderr=stderr_file)
            result = 0
        else:
            result = subprocess.call(command, shell=shell, stdout=stdout_file, stderr=stderr_file)
    finally:
        if stdout_file:
            stdout_file.close()
        if stderr_file:
            stderr_file.close()
    return result


def generate_version_h():
    """Generates a build/version.h file that contains current git info.
    """
    header_file = 'build/version.h'
    pr_number = 0
    pr_repo_name = ""
    pr_branch_name = ""
    pr_commit = ""
    pr_commit_short = ""
    if os.getenv('APPVEYOR') == 'True':
      branch_name = os.getenv('APPVEYOR_REPO_BRANCH')
      commit = os.getenv('APPVEYOR_REPO_COMMIT')
      commit_short = commit[:9]
      pr_number = os.getenv('APPVEYOR_PULL_REQUEST_NUMBER')
      if not pr_number:
        pr_number = 0
      else:
        pr_repo_name = os.getenv('APPVEYOR_PULL_REQUEST_HEAD_REPO_NAME')
        pr_branch_name = os.getenv('APPVEYOR_PULL_REQUEST_HEAD_REPO_BRANCH')
        pr_commit = os.getenv('APPVEYOR_PULL_REQUEST_HEAD_COMMIT')
        pr_commit_short = pr_commit[:9]
    elif git_is_repository():
        (branch_name, commit, commit_short) = git_get_head_info()
    else:
        branch_name = 'tarball'
        commit = ':(-dont-do-this'
        commit_short = ':('

    # header
    contents_new = '''// Autogenerated by `xb premake`.
#ifndef GENERATED_VERSION_H_
#define GENERATED_VERSION_H_
#define XE_BUILD_BRANCH "{}"
#define XE_BUILD_COMMIT "{}"
#define XE_BUILD_COMMIT_SHORT "{}"
#define XE_BUILD_DATE __DATE__
'''.format(branch_name, commit, commit_short)

    # PR info (if available)
    if pr_number != 0:
      contents_new += '''#define XE_BUILD_IS_PR
#define XE_BUILD_PR_NUMBER "{}"
#define XE_BUILD_PR_REPO "{}"
#define XE_BUILD_PR_BRANCH "{}"
#define XE_BUILD_PR_COMMIT "{}"
#define XE_BUILD_PR_COMMIT_SHORT "{}"
'''.format(pr_number, pr_repo_name, pr_branch_name, pr_commit, pr_commit_short)

    # footer
    contents_new += '''#endif  // GENERATED_VERSION_H_
'''

    contents_old = None
    if os.path.exists(header_file) and os.path.getsize(header_file) < 1024:
        with open(header_file, 'r') as f:
            contents_old = f.read()

    if contents_old != contents_new:
        with open(header_file, 'w') as f:
            f.write(contents_new)


def generate_source_class(path):
    header_path = '{}.h'.format(path)
    source_path = '{}.cc'.format(path)

    if os.path.isfile(header_path) or os.path.isfile(source_path):
        print('ERROR: Target file already exists')
        return 1

    if generate_source_file(header_path) > 0:
        return 1
    if generate_source_file(source_path) > 0:
        # remove header if source file generation failed
        os.remove(os.path.join(source_root, header_path))
        return 1

    return 0

def generate_source_file(path):
    """Generates a source file at the specified path containing copyright notice
    """
    copyright = '''/**
 ******************************************************************************
 * Xenia : Xbox 360 Emulator Research Project                                 *
 ******************************************************************************
 * Copyright {} Ben Vanik. All rights reserved.                             *
 * Released under the BSD license - see LICENSE in the root for more details. *
 ******************************************************************************
 */'''.format(datetime.now().year)

    if os.path.isfile(path):
        print('ERROR: Target file already exists')
        return 1
    try:
        with open(path, 'w') as f:
            f.write(copyright)
    except Exception as e:
        print('ERROR: Could not write to file [path {}]'.format(path))
        return 1

    return 0



def git_get_head_info():
    """Queries the current branch and commit checksum from git.

    Returns:
      (branch_name, commit, commit_short)
      If the user is not on any branch the name will be 'detached'.
    """
    p = subprocess.Popen([
        'git',
        'symbolic-ref',
        '--short',
        '-q',
        'HEAD',
        ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    (stdout, stderr) = p.communicate()
    branch_name = stdout.decode('ascii').strip() or 'detached'
    p = subprocess.Popen([
        'git',
        'rev-parse',
        'HEAD',
        ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    (stdout, stderr) = p.communicate()
    commit = stdout.decode('ascii').strip() or 'unknown'
    p = subprocess.Popen([
        'git',
        'rev-parse',
        '--short',
        'HEAD',
        ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    (stdout, stderr) = p.communicate()
    commit_short = stdout.decode('ascii').strip() or 'unknown'
    return branch_name, commit, commit_short


def git_is_repository():
    """Checks if git is available and this source tree is versioned.
    """
    if not has_bin('git'):
        return False
    return shell_call([
        'git',
        'rev-parse',
        '--is-inside-work-tree',
        ], throw_on_error=False, stdout_path=os.devnull, stderr_path=os.devnull) == 0


def git_submodule_update():
    """Runs a git submodule init and update.
    """
    shell_call([
        'git',
        '-c',
        'fetch.recurseSubmodules=on-demand',
        'submodule',
        'update',
        '--init',
        ])


def get_clang_format_binary():
    """Finds a clang-format binary. Aborts if none is found.

    Returns:
      A path to the clang-format executable.
    """
    attempts = [
        'C:\\Program Files\\LLVM\\bin\\clang-format.exe',
        'C:\\Program Files (x86)\\LLVM\\bin\\clang-format.exe',
        'clang-format-13',
        'clang-format',
        ]
    for binary in attempts:
        if has_bin(binary):
            return binary
    print('ERROR: clang-format is not on PATH')
    print('LLVM is available from https://llvm.org/releases/download.html')
    print('At least version 13 is required.')
    print('See docs/style_guide.md for instructions on how to get it.')
    sys.exit(1)


def get_premake_target_os(target_os_override=None):
    """Gets the target --os to pass to premake, either for the current platform
    or for the user-specified cross-compilation target.

    Args:
      target_os_override: override specified by the user for cross-compilation,
        or None to target the host platform.

    Returns:
      Target --os to pass to premake. If a return value of this function valid
      for the current configuration is passed to it again, the same value will
      be returned.
    """
    if sys.platform == 'darwin':
        target_os = 'macosx'
    elif sys.platform == 'win32':
        target_os = 'windows'
    elif host_linux_platform_is_android:
        target_os = 'android'
    else:
        target_os = 'linux'
    if target_os_override is not None and target_os_override != target_os:
        if target_os_override == 'android':
            target_os = target_os_override
        else:
            print(
                'ERROR: cross-compilation is only supported for Android target')
            sys.exit(0)
    return target_os


def run_premake(target_os, action, cc=None):
    """Runs premake on the main project with the given format.

    Args:
      target_os: target --os to pass to premake.
      action: action to preform.
    """
    args = [
        sys.executable,
        os.path.join('tools', 'build', 'premake'),
        '--file=premake5.lua',
        '--os=%s' % target_os,
        '--test-suite-mode=combined',
        '--verbose',
        action,
    ]
    if cc:
        args.insert(4, '--cc=%s' % cc)

    ret = subprocess.call(args, shell=False)

    if ret == 0:
        generate_version_h()

    return ret


def run_platform_premake(target_os_override=None, cc='clang', devenv=None):
    """Runs all gyp configurations.
    """
    target_os = get_premake_target_os(target_os_override)
    if devenv is None:
        if target_os == 'macosx':
            devenv = 'xcode4'
        elif target_os == 'windows':
            vs_version = '2015'
            if 'VSVERSION' in os.environ:
                vs_version = os.environ['VSVERSION']
            devenv = 'vs' + vs_version
        elif target_os == 'android':
            devenv = 'androidndk'
        else:
            devenv = 'gmake2'
    if target_os != 'linux':
        cc = None
    return run_premake(target_os=target_os, action=devenv, cc=cc)


def get_build_bin_path(args):
    """Returns the path of the bin/ path with build results based on the
    configuration specified in the parsed arguments.

    Args:
      args: Parsed arguments.

    Returns:
      A full path for the bin folder.
    """
    if sys.platform == 'darwin':
        platform = 'macosx'
    elif sys.platform == 'win32':
        platform = 'windows'
    else:
        platform = 'linux'
    return os.path.join(self_path, 'build', 'bin', platform.capitalize(), args['config'].capitalize())


def create_clion_workspace():
    """Creates some basic workspace information inside the .idea directory for first start.
    """
    if os.path.exists('.idea'):
        # No first start
        return False
    print('Generating CLion workspace files...')
    # Might become easier in the future: https://youtrack.jetbrains.com/issue/CPP-7911

    # Set the location of the CMakeLists.txt
    os.mkdir('.idea')
    with open(os.path.join('.idea', 'misc.xml'), 'w') as f:
        f.write("""<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$/build">
    <contentRoot DIR="$PROJECT_DIR$" />
  </component>
</project>
""")

    # Set available configurations
    # TODO Find a way to trigger a cmake reload
    with open(os.path.join('.idea', 'workspace.xml'), 'w') as f:
        f.write("""<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="CMakeSettings">
    <configurations>
      <configuration PROFILE_NAME="Checked" CONFIG_NAME="Checked" />
      <configuration PROFILE_NAME="Debug" CONFIG_NAME="Debug" />
      <configuration PROFILE_NAME="Release" CONFIG_NAME="Release" />
    </configurations>
  </component>
</project>""")

    return True


def discover_commands(subparsers):
    """Looks for all commands and returns a dictionary of them.
    In the future commands could be discovered on disk.

    Args:
      subparsers: Argument subparsers parent used to add command parsers.

    Returns:
      A dictionary containing name-to-Command mappings.
    """
    commands = {
        'setup': SetupCommand(subparsers),
        'pull': PullCommand(subparsers),
        'premake': PremakeCommand(subparsers),
        'build': BuildCommand(subparsers),
        'buildshaders': BuildShadersCommand(subparsers),
        'devenv': DevenvCommand(subparsers),
        'gentests': GenTestsCommand(subparsers),
        'test': TestCommand(subparsers),
        'gputest': GpuTestCommand(subparsers),
        'clean': CleanCommand(subparsers),
        'nuke': NukeCommand(subparsers),
        'lint': LintCommand(subparsers),
        'format': FormatCommand(subparsers),
        'style': StyleCommand(subparsers),
        'tidy': TidyCommand(subparsers),
        'stub': StubCommand(subparsers),
        }
    return commands


class Command(object):
    """Base type for commands.
    """

    def __init__(self, subparsers, name, help_short=None, help_long=None,
                 *args, **kwargs):
        """Initializes a command.

        Args:
          subparsers: Argument subparsers parent used to add command parsers.
          name: The name of the command exposed to the management script.
          help_short: Help text printed alongside the command when queried.
          help_long: Extended help text when viewing command help.
        """
        self.name = name
        self.help_short = help_short
        self.help_long = help_long

        self.parser = subparsers.add_parser(name,
                                            help=help_short,
                                            description=help_long)
        self.parser.set_defaults(command_handler=self)

    def execute(self, args, pass_args, cwd):
        """Executes the command.

        Args:
          args: Arguments hash for the command.
          pass_args: Arguments list to pass to child commands.
          cwd: Current working directory.

        Returns:
          Return code of the command.
        """
        return 1


class SetupCommand(Command):
    """'setup' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(SetupCommand, self).__init__(
            subparsers,
            name='setup',
            help_short='Setup the build environment.',
            *args, **kwargs)
        self.parser.add_argument(
            '--target_os', default=None,
            help='Target OS passed to premake, for cross-compilation')

    def execute(self, args, pass_args, cwd):
        print('Setting up the build environment...')
        print('')

        # Setup submodules.
        print('- git submodule init / update...')
        if git_is_repository():
            git_submodule_update()
        else:
            print('WARNING: Git not available or not a repository. Dependencies may be missing.')
        print('')

        print('- running premake...')
        if run_platform_premake(target_os_override=args['target_os']) == 0:
            print('')
            print('Success!')

        return 0


class PullCommand(Command):
    """'pull' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(PullCommand, self).__init__(
            subparsers,
            name='pull',
            help_short='Pulls the repo and all dependencies and rebases changes.',
            *args, **kwargs)
        self.parser.add_argument(
            '--merge', action='store_true',
             help='Merges on master instead of rebasing.')
        self.parser.add_argument(
            '--target_os', default=None,
            help='Target OS passed to premake, for cross-compilation')

    def execute(self, args, pass_args, cwd):
        print('Pulling...')
        print('')

        print('- switching to master...')
        shell_call([
            'git',
            'checkout',
            'master',
            ])
        print('')

        print('- pulling self...')
        if args['merge']:
            shell_call([
                'git',
                'pull',
                ])
        else:
            shell_call([
                'git',
                'pull',
                '--rebase',
                ])
        print('')

        print('- pulling dependencies...')
        git_submodule_update()
        print('')

        print('- running premake...')
        if run_platform_premake(target_os_override=args['target_os']) == 0:
            print('')
            print('Success!')

        return 0


class PremakeCommand(Command):
    """'premake' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(PremakeCommand, self).__init__(
            subparsers,
            name='premake',
            help_short='Runs premake to update all projects.',
            *args, **kwargs)
        self.parser.add_argument(
            '--cc', default='clang', help='Compiler toolchain passed to premake')
        self.parser.add_argument(
            '--devenv', default=None, help='Development environment')
        self.parser.add_argument(
            '--target_os', default=None,
            help='Target OS passed to premake, for cross-compilation')

    def execute(self, args, pass_args, cwd):
        # Update premake. If no binary found, it will be built from source.
        print('Running premake...')
        print('')
        if run_platform_premake(target_os_override=args['target_os'],
                                cc=args['cc'], devenv=args['devenv']) == 0:
            print('Success!')

        return 0


class BaseBuildCommand(Command):
    """Base command for things that require building."""

    def __init__(self, subparsers, *args, **kwargs):
        super(BaseBuildCommand, self).__init__(
            subparsers,
            *args, **kwargs)
        self.parser.add_argument(
            '--cc', default='clang', help='Compiler toolchain passed to premake')
        self.parser.add_argument(
            '--config', choices=['checked', 'debug', 'release'], default='debug',
            type=str.lower, help='Chooses the build configuration.')
        self.parser.add_argument(
            '--target', action='append', default=[],
            help='Builds only the given target(s).')
        self.parser.add_argument(
            '--force', action='store_true',
            help='Forces a full rebuild.')
        self.parser.add_argument(
            '--no_premake', action='store_true',
            help='Skips running premake before building.')
        self.parser.add_argument(
            '-j', default=4, type=int, help='Number of parallel threads')

    def execute(self, args, pass_args, cwd):
        if not args['no_premake']:
            print('- running premake...')
            run_platform_premake(cc=args['cc'])
            print('')

        threads = args['j']
        if threads < 0:
            threads = 0

        print('- building (%s):%s...' % (
            'all' if not len(args['target']) else ', '.join(args['target']),
            args['config']))
        if sys.platform == 'win32':
            if vs_version is None:
                print('ERROR: Visual Studio is not installed.');
                result = 1
            else:
                targets = None
                if len(args['target']):
                    targets = '/t:' + ';'.join(
                        target + (':Rebuild' if args['force'] else '')
                        for target in args['target'])
                else:
                    targets = '/t:Rebuild' if args['force'] else None

                result = subprocess.call([
                    'msbuild',
                    'build/xenia.sln',
                    '/nologo',
                    '/m',
                    '/v:m',
                    '/p:Configuration=' + args['config'],
                    ] + ([targets] if targets is not None else []) + pass_args,
                    shell=False)
        elif sys.platform == 'darwin':
            schemes = args['target'] if len(args['target']) else ['xenia-app']
            nested_args = [['-scheme', scheme] for scheme in schemes]
            scheme_args = [arg for pair in nested_args for arg in pair]
            result = subprocess.call([
                'xcodebuild',
                '-workspace',
                'build/xenia.xcworkspace',
                '-configuration',
                args['config']
            ] + scheme_args + pass_args, shell=False, env=dict(os.environ))
        else:
            result = subprocess.call([
                'make',
                '-j' if threads == 0 else '-j%d' % threads,
                '-Cbuild/',
                'config=%s_linux' % (args['config']),
            ] + pass_args + args['target'], shell=False, env=dict(os.environ))
        print('')
        if result != 0:
            print('ERROR: build failed with one or more errors.')
            return result
        return 0


class BuildCommand(BaseBuildCommand):
    """'build' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(BuildCommand, self).__init__(
            subparsers,
            name='build',
            help_short='Builds the project with the default toolchain.',
            *args, **kwargs)

    def execute(self, args, pass_args, cwd):
        print('Building %s...' % (args['config']))
        print('')

        result = super(BuildCommand, self).execute(args, pass_args, cwd)
        if not result:
            print('Success!')
        return result


class BuildShadersCommand(Command):
    """'buildshaders' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(BuildShadersCommand, self).__init__(
            subparsers,
            name='buildshaders',
            help_short='Generates shader binaries for inclusion in C++ files.',
            help_long='''
            Generates the shader binaries under src/*/shaders/bytecode/.
            Run after modifying any .hs/vs/ds/gs/ps/cs.glsl/hlsl/xesl files.
            Direct3D shaders can be built only on a Windows host.
            ''',
            *args, **kwargs)
        self.parser.add_argument(
            '--target', action='append', choices=['dxbc', 'spirv'], default=[],
            help='Builds only the given target(s).')

    def execute(self, args, pass_args, cwd):
        src_paths = [os.path.join(root, name)
                     for root, dirs, files in os.walk('src')
                     for name in files
                     if (name.endswith('.glsl') or
                         name.endswith('.hlsl') or
                         name.endswith('.xesl'))]
        targets = args['target']
        all_targets = len(targets) == 0

        # XeSL ("Xenia Shading Language") means shader files that can be
        # compiled as multiple languages from a single file. Whenever possible,
        # this is achieved without the involvement of the build script, using
        # just conditionals, macros and functions in shaders, however, in some
        # cases, that's necessary (such as to prepend `#version` in GLSL, as
        # well as to enable `#include` in GLSL, to include `xesl.xesli` itself,
        # without writing the same `#if` / `#extension` / `#endif` in every
        # shader). Also, not all shading languages provide a built-in
        # preprocessor definition for identification of them, so XESL_LANGUAGE_*
        # is also defined via the build arguments. XESL_LANGUAGE_* is set
        # regardless of whether the file is XeSL or a raw source file in a
        # specific language, as XeSL headers may be used in language-specific
        # sources.

        # Direct3D DXBC.
        if all_targets or 'dxbc' in targets:
            if sys.platform == 'win32':
                print('Building Direct3D 12 Shader Model 5.1 DXBC shaders...')

                # Get the FXC path.
                # TODO(Triang3l): Find FXC in the most recent Windows SDK.
                program_files_path = os.environ['ProgramFiles(x86)']
                if not os.path.exists(program_files_path):
                    print('ERROR: could not find 32-bit Program Files')
                    return 1
                windows_sdk_bin_path = os.path.join(
                    program_files_path, 'Windows Kits/10/bin/10.0.19041.0/x64')
                if not os.path.exists(windows_sdk_bin_path):
                    print('ERROR: could not find Windows 10 SDK binaries')
                    return 1
                fxc = os.path.join(windows_sdk_bin_path, 'fxc')
                if not has_bin(fxc):
                    print('ERROR: could not find fxc')
                    return 1

                # Build DXBC.
                dxbc_stages = ['vs', 'hs', 'ds', 'gs', 'ps', 'cs']
                for src_path in src_paths:
                    src_name = os.path.basename(src_path)
                    if ((not src_name.endswith('.hlsl') and
                         not src_name.endswith('.xesl')) or
                        len(src_name) <= 8 or src_name[-8] != '.'):
                        continue
                    dxbc_identifier = src_name[:-5].replace('.', '_')
                    dxbc_stage = dxbc_identifier[-2:]
                    if not dxbc_stage in dxbc_stages:
                        continue
                    print('- %s > d3d12_5_1' % (src_path))
                    dxbc_dir_path = os.path.join(os.path.dirname(src_path),
                                                 'bytecode/d3d12_5_1')
                    os.makedirs(dxbc_dir_path, exist_ok=True)
                    dxbc_file_path_base = os.path.join(dxbc_dir_path,
                                                       dxbc_identifier)
                    # Not enabling treating warnings as errors (/WX) because it
                    # overrides #pragma warning, and the FXAA shader triggers a
                    # bug in FXC causing an uninitialized variable warning if
                    # early exit from a function is done.
                    # FXC writes errors and warnings to stderr, not stdout, but
                    # stdout receives generic status messages that only add
                    # clutter in this case.
                    if subprocess.call([
                           fxc,
                           '/D', 'XESL_LANGUAGE_HLSL=1',
                           '/Fh', dxbc_file_path_base + '.h',
                           '/T', dxbc_stage + '_5_1',
                           '/Vn', dxbc_identifier,
                           '/nologo',
                           src_path,
                           ], stdout=subprocess.DEVNULL) != 0:
                        print('ERROR: failed to compile a DXBC shader')
                        return 1
            else:
                if all_targets:
                    print('WARNING: Direct3D DXBC shader building is supported '
                          'only on Windows')
                else:
                    print('ERROR: Direct3D DXBC shader building is supported '
                          'only on Windows')
                    return 1

        # Vulkan SPIR-V.
        if all_targets or 'spirv' in targets:
            print('Building Vulkan SPIR-V shaders...')

            # Get the SPIR-V tool paths.
            vulkan_sdk_path = os.environ['VULKAN_SDK']
            if not os.path.exists(vulkan_sdk_path):
                print('ERROR: could not find the Vulkan SDK in $VULKAN_SDK')
                return 1
            # bin is lowercase on Linux (even though it's uppercase on Windows).
            vulkan_bin_path = os.path.join(vulkan_sdk_path, 'bin')
            if not os.path.exists(vulkan_bin_path):
                print('ERROR: could not find the Vulkan SDK binaries')
                return 1
            glslang = os.path.join(vulkan_bin_path, 'glslangValidator')
            if not has_bin(glslang):
                print('ERROR: could not find glslangValidator')
                return 1
            spirv_opt = os.path.join(vulkan_bin_path, 'spirv-opt')
            if not has_bin(spirv_opt):
                print('ERROR: could not find spirv-opt')
                return 1
            spirv_remap = os.path.join(vulkan_bin_path, 'spirv-remap')
            if not has_bin(spirv_remap):
                print('ERROR: could not find spirv-remap')
                return 1
            spirv_dis = os.path.join(vulkan_bin_path, 'spirv-dis')
            if not has_bin(spirv_dis):
                print('ERROR: could not find spirv-dis')
                return 1

            # Build SPIR-V.
            spirv_stages = {
                'vs': 'vert',
                'hs': 'tesc',
                'ds': 'tese',
                'gs': 'geom',
                'ps': 'frag',
                'cs': 'comp',
            }
            # #version and extensions must be before everything else in a GLSL
            # file, can't use a language conditional to add them. Use string
            # interpolation to insert the file name. Using #include also
            # preserves line numbers in error and warning messages.
            spirv_xesl_wrapper =  \
                '#version 460\n' + \
                '#extension GL_EXT_samplerless_texture_functions : require\n' + \
                '#extension GL_GOOGLE_include_directive : require\n' + \
                '#include "%s"\n'
            for src_path in src_paths:
                src_name = os.path.basename(src_path)
                src_is_xesl = src_name.endswith('.xesl')
                if ((not src_is_xesl and not src_name.endswith('.glsl')) or
                    len(src_name) <= 8 or src_name[-8] != '.'):
                    continue
                spirv_identifier = src_name[:-5].replace('.', '_')
                spirv_stage = spirv_stages.get(spirv_identifier[-2:], None)
                if spirv_stage is None:
                    continue
                print('- %s > vulkan_spirv' % (src_path))
                src_dir = os.path.dirname(src_path)
                spirv_dir_path = os.path.join(src_dir, 'bytecode/vulkan_spirv')
                os.makedirs(spirv_dir_path, exist_ok=True)
                spirv_file_path_base = os.path.join(spirv_dir_path,
                                                    spirv_identifier)
                spirv_glslang_file_path = spirv_file_path_base + '.glslang.spv'
                # --stdin must be before -S for some reason.
                glslang_arguments = [glslang,
                                     '--stdin' if src_is_xesl else src_path,
                                     '-DXESL_LANGUAGE_GLSL=1',
                                     '-S', spirv_stage,
                                     '-o', spirv_glslang_file_path,
                                     '-V']
                # When compiling the code from stdin, there's no directory
                # containing the file, add the include directory explicitly.
                if src_is_xesl:
                    glslang_arguments.append('-I' + src_dir)
                if subprocess.run(
                       glslang_arguments,
                       input = (spirv_xesl_wrapper % src_name) if src_is_xesl
                               else None,
                       universal_newlines = True).returncode != 0:
                    print('ERROR: failed to build a SPIR-V shader')
                    return 1
                # spirv-opt input and output files must be different.
                spirv_file_path = spirv_file_path_base + '.spv'
                if subprocess.call([
                       spirv_opt,
                       '-O',
                       spirv_glslang_file_path,
                       '-o', spirv_file_path,
                       ]) != 0:
                    print('ERROR: failed to optimize a SPIR-V shader')
                    return 1
                os.remove(spirv_glslang_file_path)
                # spirv-remap takes the output directory, but it may be the same
                # as the one the input is stored in.
                if subprocess.call([
                       spirv_remap,
                       '--do-everything',
                       '-i', spirv_file_path,
                       '-o', spirv_dir_path,
                       ]) != 0:
                    print('ERROR: failed to remap a SPIR-V shader')
                    return 1
                spirv_dis_file_path = spirv_file_path_base + '.txt';
                if subprocess.call([
                       spirv_dis,
                       '-o', spirv_dis_file_path,
                       spirv_file_path,
                       ]) != 0:
                    print('ERROR: failed to disassemble a SPIR-V shader')
                    return 1
                # Generate the header from the disassembly and the binary.
                with open(spirv_file_path_base + '.h', 'w') as out_file:
                    out_file.write(
                        '// Generated with `xb buildshaders`.\n#if 0\n')
                    with open(spirv_dis_file_path, 'r') as spirv_dis_file:
                        spirv_dis_data = spirv_dis_file.read()
                        if len(spirv_dis_data) > 0:
                            out_file.write(spirv_dis_data)
                            if spirv_dis_data[-1] != '\n':
                                out_file.write('\n')
                    out_file.write('#endif\n\nconst uint32_t %s[] = {' %
                                   spirv_identifier)
                    with open(spirv_file_path, 'rb') as spirv_file:
                        index = 0
                        # SPIR-V consists of host-endian 32-bit words.
                        c = spirv_file.read(4)
                        while len(c) != 0:
                            if len(c) != 4:
                                print('ERROR: a SPIR-V shader is misaligned')
                                return 1
                            if index % 6 == 0:
                                out_file.write('\n    ')
                            else:
                                out_file.write(' ')
                            index += 1
                            out_file.write(
                                '0x%08X,' % int.from_bytes(c, sys.byteorder))
                            c = spirv_file.read(4)
                    out_file.write('\n};\n')
                os.remove(spirv_dis_file_path)
                os.remove(spirv_file_path)
        return 0


class TestCommand(BaseBuildCommand):
    """'test' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(TestCommand, self).__init__(
            subparsers,
            name='test',
            help_short='Runs automated tests that have been built with `xb build`.',
            help_long='''
            To pass arguments to the test executables separate them with `--`.
            For example, you can run only the instr_foo.s tests with:
              $ xb test -- instr_foo
            ''',
            *args, **kwargs)
        self.parser.add_argument(
            '--no_build', action='store_true',
            help='Don\'t build before running tests.')
        self.parser.add_argument(
            '--continue', action='store_true',
            help='Don\'t stop when a test errors, but continue running all.')

    def execute(self, args, pass_args, cwd):
        print('Testing...')
        print('')

        # The test executables that will be built and run.
        test_targets = args['target'] or [
            'xenia-base-tests',
            'xenia-cpu-ppc-tests'
            ]
        args['target'] = test_targets

        # Build all targets (if desired).
        if not args['no_build']:
            result = super(TestCommand, self).execute(args, [], cwd)
            if result:
                print('Failed to build, aborting test run.')
                return result

        # Ensure all targets exist before we run.
        test_executables = [
            get_bin(os.path.join(get_build_bin_path(args), test_target))
            for test_target in test_targets]
        for i in range(0, len(test_targets)):
            if test_executables[i] is None:
                print('ERROR: Unable to find %s - build it.' % (test_targets[i]))
                return 1

        # Run tests.
        any_failed = False
        for test_executable in test_executables:
            print('- %s' % test_executable)
            result = shell_call([test_executable] + pass_args,
                                throw_on_error=False)
            if result:
                any_failed = True
                if args['continue']:
                    print('ERROR: test failed but continuing due to --continue.')
                else:
                    print('ERROR: test failed, aborting, use --continue to keep going.')
                    return result

        if any_failed:
            print('ERROR: one or more tests failed.')
            result = 1
        return result


class GenTestsCommand(Command):
    """'gentests' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(GenTestsCommand, self).__init__(
            subparsers,
            name='gentests',
            help_short='Generates test binaries.',
            help_long='''
            Generates test binaries (under src/xenia/cpu/ppc/testing/bin/).
            Run after modifying test .s files.
            ''',
            *args, **kwargs)

    def execute(self, args, pass_args, cwd):
        print('Generating test binaries...')
        print('')

        binutils_path = os.path.join('third_party', 'binutils-ppc-cygwin')
        ppc_as = os.path.join(binutils_path, 'powerpc-none-elf-as')
        ppc_ld = os.path.join(binutils_path, 'powerpc-none-elf-ld')
        ppc_objdump = os.path.join(binutils_path, 'powerpc-none-elf-objdump')
        ppc_nm = os.path.join(binutils_path, 'powerpc-none-elf-nm')

        test_src = os.path.join('src', 'xenia', 'cpu', 'ppc', 'testing')
        test_bin = os.path.join(test_src, 'bin')

        # Ensure the test output path exists.
        if not os.path.exists(test_bin):
            os.mkdir(test_bin)

        src_files = [os.path.join(root, name)
                     for root, dirs, files in os.walk('src')
                     for name in files
                     if (name.startswith('instr_') or name.startswith('seq_'))
                     and name.endswith(('.s'))]

        def make_unix_path(p):
            """Forces a unix path separator style, as required by binutils.
            """
            return p.replace(os.sep, '/')

        any_errors = False
        for src_file in src_files:
            print('- %s' % src_file)
            src_name = os.path.splitext(os.path.basename(src_file))[0]
            obj_file = os.path.join(test_bin, src_name) + '.o'
            shell_call([
                ppc_as,
                '-a32',
                '-be',
                '-mregnames',
                '-mpower7',
                '-maltivec',
                '-mvsx',
                '-mvmx128',
                '-R',
                '-o%s' % (make_unix_path(obj_file)),
                make_unix_path(src_file),
                ])
            dis_file = os.path.join(test_bin, src_name) + '.dis'
            shell_call([
                ppc_objdump,
                '--adjust-vma=0x100000',
                '-Mpower7',
                '-Mvmx128',
                '-D',
                '-EB',
                make_unix_path(obj_file),
                ], stdout_path=dis_file)
            # Eat the first 4 lines to kill the file path that'll differ across machines.
            with open(dis_file) as f:
                dis_file_lines = f.readlines()
            with open(dis_file, 'w') as f:
                f.writelines(dis_file_lines[4:])
            shell_call([
                ppc_ld,
                '-A powerpc:common32',
                '-melf32ppc',
                '-EB',
                '-nostdlib',
                '--oformat=binary',
                '-Ttext=0x80000000',
                '-e0x80000000',
                '-o%s' % (make_unix_path(os.path.join(test_bin, src_name) + '.bin')),
                make_unix_path(obj_file),
                ])
            shell_call([
                ppc_nm,
                '--numeric-sort',
                make_unix_path(obj_file),
                ], stdout_path=os.path.join(test_bin, src_name) + '.map')

        if any_errors:
            print('ERROR: failed to build one or more tests.')
            return 1

        return 0


class GpuTestCommand(BaseBuildCommand):
    """'gputest' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(GpuTestCommand, self).__init__(
            subparsers,
            name='gputest',
            help_short='Runs automated GPU diff tests against reference imagery.',
            help_long='''
            To pass arguments to the test executables separate them with `--`.
            ''',
            *args, **kwargs)
        self.parser.add_argument(
            '--no_build', action='store_true',
            help='Don\'t build before running tests.')
        self.parser.add_argument(
            '--update_reference_files', action='store_true',
            help='Update all reference imagery.')
        self.parser.add_argument(
            '--generate_missing_reference_files', action='store_true',
            help='Create reference files for new traces.')

    def execute(self, args, pass_args, cwd):
        print('Testinging...')
        print('')

        # The test executables that will be built and run.
        test_targets = args['target'] or [
            'xenia-gpu-vulkan-trace-dump',
            ]
        args['target'] = test_targets

        # Build all targets (if desired).
        if not args['no_build']:
            result = super(GpuTestCommand, self).execute(args, [], cwd)
            if result:
                print('Failed to build, aborting test run.')
                return result

        # Ensure all targets exist before we run.
        test_executables = [
            get_bin(os.path.join(get_build_bin_path(args), test_target))
            for test_target in test_targets]
        for i in range(0, len(test_targets)):
            if test_executables[i] is None:
                print('ERROR: Unable to find %s - build it.' % (test_targets[i]))
                return 1

        output_path = os.path.join(self_path, 'build', 'gputest')
        if os.path.isdir(output_path):
            shutil.rmtree(output_path)
        os.makedirs(output_path)
        print('Running tests and outputting to %s...' % (output_path))

        reference_trace_root = os.path.join(self_path, 'testdata',
                                            'reference-gpu-traces')

        # Run tests.
        any_failed = False
        result = shell_call([
            sys.executable,
            os.path.join(self_path, 'tools', 'gpu-trace-diff'),
            '--executable=' + test_executables[0],
            '--trace_path=' + os.path.join(reference_trace_root, 'traces'),
            '--output_path=' + output_path,
            '--reference_path=' + os.path.join(reference_trace_root, 'references'),
            ] + (['--generate_missing_reference_files'] if args['generate_missing_reference_files'] else []) +
                (['--update_reference_files'] if args['update_reference_files'] else []) +
                            pass_args,
                            throw_on_error=False)
        if result:
            any_failed = True

        if any_failed:
            print('ERROR: one or more tests failed.')
            result = 1
        print('Check %s/results.html for more details.' % (output_path))
        return result


class CleanCommand(Command):
    """'clean' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(CleanCommand, self).__init__(
            subparsers,
            name='clean',
            help_short='Removes intermediate files and build outputs.',
            *args, **kwargs)
        self.parser.add_argument(
            '--target_os', default=None,
            help='Target OS passed to premake, for cross-compilation')

    def execute(self, args, pass_args, cwd):
        print('Cleaning build artifacts...')
        print('')

        print('- premake clean...')
        run_premake(get_premake_target_os(args['target_os']), 'clean')
        print('')

        print('Success!')
        return 0


class NukeCommand(Command):
    """'nuke' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(NukeCommand, self).__init__(
            subparsers,
            name='nuke',
            help_short='Removes all build/ output.',
            *args, **kwargs)
        self.parser.add_argument(
            '--target_os', default=None,
            help='Target OS passed to premake, for cross-compilation')

    def execute(self, args, pass_args, cwd):
        print('Cleaning build artifacts...')
        print('')

        print('- removing build/...')
        if os.path.isdir('build/'):
            shutil.rmtree('build/')
        print('')

        print('- git reset to master...')
        shell_call([
            'git',
            'reset',
            '--hard',
            'master',
            ])
        print('')

        print('- running premake...')
        run_platform_premake(target_os_override=args['target_os'])
        print('')

        print('Success!')
        return 0


def find_xenia_source_files():
    """Gets all xenia source files in the project.

    Returns:
      A list of file paths.
    """
    return [os.path.join(root, name)
            for root, dirs, files in os.walk('src')
            for name in files
            if name.endswith(('.cc', '.c', '.h', '.inl', '.inc'))]


def find_all_source_files():
    """Gets all interesting source files in the project.

    Returns:
      A list of file paths.
    """
    return find_xenia_source_files()


class LintCommand(Command):
    """'lint' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(LintCommand, self).__init__(
            subparsers,
            name='lint',
            help_short='Checks for lint errors with clang-format.',
            *args, **kwargs)
        self.parser.add_argument(
            '--all', action='store_true',
            help='Lint all files, not just those changed.')
        self.parser.add_argument(
            '--origin', action='store_true',
            help='Lints all files changed relative to origin/master.')

    def execute(self, args, pass_args, cwd):
        clang_format_binary = get_clang_format_binary()

        difftemp = '.difftemp.txt'

        if args['all']:
            all_files = find_all_source_files()
            all_files.sort()
            print('- linting %d files' % (len(all_files)))
            any_errors = False
            for file_path in all_files:
                if os.path.exists(difftemp): os.remove(difftemp)
                ret = shell_call([
                    clang_format_binary,
                    '-output-replacements-xml',
                    '-style=file',
                    file_path,
                    ], throw_on_error=False, stdout_path=difftemp)
                with open(difftemp) as f:
                    had_errors = '<replacement ' in f.read()
                if os.path.exists(difftemp): os.remove(difftemp)
                if had_errors:
                    any_errors = True
                    print('')
                    print(file_path)
                    shell_call([
                        clang_format_binary,
                        '-style=file',
                        file_path,
                        ], throw_on_error=False, stdout_path=difftemp)
                    shell_call([
                        sys.executable,
                        'tools/diff.py',
                        file_path,
                        difftemp,
                        difftemp,
                        ])
                    shell_call([
                        'type' if sys.platform == 'win32' else 'cat',
                        difftemp,
                        ], shell=True if sys.platform == 'win32' else False)
                    if os.path.exists(difftemp): os.remove(difftemp)
                    print('')
            print('')
            if any_errors:
                print('ERROR: 1+ diffs. Stage changes and run \'xb format\' to fix.')
                return 1
            else:
                print('Linting completed successfully.')
                return 0
        else:
            print('- git-clang-format --diff')
            if os.path.exists(difftemp): os.remove(difftemp)
            ret = shell_call([
                sys.executable,
                'third_party/clang-format/git-clang-format',
                '--binary=%s' % (clang_format_binary),
                '--commit=%s' % ('origin/master' if args['origin'] else 'HEAD'),
                '--style=file',
                '--diff',
                ], throw_on_error=False, stdout_path=difftemp)
            with open(difftemp) as f:
                contents = f.read()
                not_modified = 'no modified files' in contents
                not_modified = not_modified or 'did not modify' in contents
                f.close()
            if os.path.exists(difftemp): os.remove(difftemp)
            if not not_modified:
                any_errors = True
                print('')
                shell_call([
                    sys.executable,
                    'third_party/clang-format/git-clang-format',
                    '--binary=%s' % (clang_format_binary),
                    '--commit=%s' % ('origin/master' if args['origin'] else 'HEAD'),
                    '--style=file',
                    '--diff',
                    ])
                print('ERROR: 1+ diffs. Stage changes and run \'xb format\' to fix.')
                return 1
            else:
                print('Linting completed successfully.')
                return 0


class FormatCommand(Command):
    """'format' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(FormatCommand, self).__init__(
            subparsers,
            name='format',
            help_short='Reformats staged code with clang-format.',
            *args, **kwargs)
        self.parser.add_argument(
            '--all', action='store_true',
            help='Format all files, not just those changed.')
        self.parser.add_argument(
            '--origin', action='store_true',
            help='Formats all files changed relative to origin/master.')

    def execute(self, args, pass_args, cwd):
        clang_format_binary = get_clang_format_binary()

        if args['all']:
            all_files = find_all_source_files()
            all_files.sort()
            print('- clang-format [%d files]' % (len(all_files)))
            any_errors = False
            for file_path in all_files:
                ret = shell_call([
                    clang_format_binary,
                    '-i',
                    '-style=file',
                    file_path,
                    ], throw_on_error=False)
                if ret:
                    any_errors = True
            print('')
            if any_errors:
                print('ERROR: 1+ clang-format calls failed.')
                print('Ensure all files are staged.')
                return 1
            else:
                print('Formatting completed successfully.')
                return 0
        else:
            print('- git-clang-format')
            shell_call([
                sys.executable,
                'third_party/clang-format/git-clang-format',
                '--binary=%s' % (clang_format_binary),
                '--commit=%s' % ('origin/master' if args['origin'] else 'HEAD'),
                ])
            print('')

        return 0


# TODO(benvanik): merge into linter, or as lint --anal?
class StyleCommand(Command):
    """'style' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(StyleCommand, self).__init__(
            subparsers,
            name='style',
            help_short='Runs the style checker on all code.',
            *args, **kwargs)

    def execute(self, args, pass_args, cwd):
        all_files = [file_path for file_path in find_all_source_files()
                     if not file_path.endswith('_test.cc')]
        print('- cpplint [%d files]' % (len(all_files)))
        ret = shell_call([
            sys.executable,
            'third_party/google-styleguide/cpplint/cpplint.py',
            '--output=vs7',
            '--linelength=80',
            '--filter=-build/c++11,+build/include_alpha',
            '--root=src',
            ] + all_files, throw_on_error=False)
        print('')
        if ret:
            print('ERROR: 1+ cpplint calls failed.')
            return 1
        else:
            print('Style linting completed successfully.')
            return 0


# TODO(benvanik): merge into linter, or as lint --anal?
class TidyCommand(Command):
    """'tidy' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(TidyCommand, self).__init__(
            subparsers,
            name='tidy',
            help_short='Runs the clang-tidy checker on all code.',
            *args, **kwargs)
        self.parser.add_argument(
            '--fix', action='store_true',
            help='Applies suggested fixes, where possible.')
        self.parser.add_argument(
            '--target_os', default=None,
            help='Target OS passed to premake, for cross-compilation')

    def execute(self, args, pass_args, cwd):
        # Run premake to generate our compile_commands.json file for clang to use.
        # TODO(benvanik): only do linux? whatever clang-tidy is ok with.
        run_premake(get_premake_target_os(args['target_os']),
                    'export-compile-commands')

        platform_name = ''
        if sys.platform == 'darwin':
            platform_name = 'darwin'
        elif sys.platform == 'win32':
            platform_name = 'windows'
        else:
            platform_name = 'linux'
        tool_root = 'build/llvm_tools/debug_%s' % platform_name

        all_files = [file_path for file_path in find_all_source_files()
                     if not file_path.endswith('_test.cc')]
        # Tidy only likes .cc files.
        all_files = [file_path for file_path in all_files
                     if file_path.endswith('.cc')]

        any_errors = False
        for file in all_files:
            print('- clang-tidy %s' % (file))
            ret = shell_call([
                'clang-tidy',
                '-p', tool_root,
                '-checks=' + ','.join([
                    'clang-analyzer-*',
                    'google-*',
                    'misc-*',
                    'modernize-*'
                    # TODO(benvanik): pick the ones we want - some are silly.
                    # 'readability-*',
                ]),
                ] + (['-fix'] if args['fix'] else []) + [
                    file,
                ], throw_on_error=False)
            if ret:
                any_errors = True

        print('')
        if any_errors:
            print('ERROR: 1+ clang-tidy calls failed.')
            return 1
        else:
            print('Tidy completed successfully.')
            return 0

class StubCommand(Command):
    """'stub' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(StubCommand, self).__init__(
            subparsers,
            name='stub',
            help_short='Create new file(s) in the xenia source tree and run premake',
            *args, **kwargs)
        self.parser.add_argument(
            '--file', default=None,
            help='Generate a source file at the provided location in the source tree')
        self.parser.add_argument(
            '--class', default=None,
            help='Generate a class pair (.cc/.h) at the provided location in the source tree')
        self.parser.add_argument(
            '--target_os', default=None,
            help='Target OS passed to premake, for cross-compilation')

    def execute(self, args, pass_args, cwd):
        root = os.path.dirname(os.path.realpath(__file__))
        source_root = os.path.join(root, os.path.normpath('src/xenia'))

        if args['class']:
            path = os.path.normpath(os.path.join(source_root, args['class']))
            target_dir = os.path.dirname(path)
            class_name = os.path.basename(path)

            status = generate_source_class(path)
            if status > 0:
                return status

            print('Created class \'{0}\' at {1}'.format(class_name, target_dir))

        elif args['file']:
            path = os.path.normpath(os.path.join(source_root, args['file']))
            target_dir = os.path.dirname(path)
            file_name = os.path.basename(path)

            status = generate_source_file(path)
            if status > 0:
                return status

            print('Created file \'{0}\' at {1}'.format(file_name, target_dir))

        else:
            print('ERROR: Please specify a file/class to generate')
            return 1

        run_platform_premake(target_os_override=args['target_os'])
        return 0

class DevenvCommand(Command):
    """'devenv' command."""

    def __init__(self, subparsers, *args, **kwargs):
        super(DevenvCommand, self).__init__(
            subparsers,
            name='devenv',
            help_short='Launches the development environment.',
            *args, **kwargs)

    def execute(self, args, pass_args, cwd):
        devenv = None
        show_reload_prompt = False
        if sys.platform == 'win32':
            if vs_version is None:
                print('ERROR: Visual Studio is not installed.');
                return 1
            print('Launching Visual Studio...')
        elif sys.platform == 'darwin':
            print('Launching Xcode...')
            devenv = 'xcode4'
        elif has_bin('clion') or has_bin('clion.sh'):
            print('Launching CLion...')
            show_reload_prompt = create_clion_workspace()
            devenv = 'cmake'
        else:
            print('Launching CodeLite...')
            devenv = 'codelite'
        print('')

        print('- running premake...')
        run_platform_premake(devenv=devenv)
        print('')

        print('- launching devenv...')
        if show_reload_prompt:
            print_box('Please run "File ⇒ ↺ Reload CMake Project" from inside the IDE!')
        if sys.platform == 'win32':
            shell_call([
                'devenv',
                'build\\xenia.sln',
            ])
        elif sys.platform == 'darwin':
            shell_call([
                'xed',
                'build/xenia.xcworkspace',
            ])
        elif has_bin('clion'):
            shell_call([
                'clion',
                '.',
            ])
        elif has_bin('clion.sh'):
            shell_call([
                'clion.sh',
                '.',
            ])
        else:
            shell_call([
                'codelite',
                'build/xenia.workspace',
            ])
        print('')

        return 0


if __name__ == '__main__':
    main()