waflib/extras/qt4.py

#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2006-2010 (ita)

"""

Tool Description
================

This tool helps with finding Qt4 tools and libraries,
and also provides syntactic sugar for using Qt4 tools.

The following snippet illustrates the tool usage::

	def options(opt):
		opt.load('compiler_cxx qt4')

	def configure(conf):
		conf.load('compiler_cxx qt4')

	def build(bld):
		bld(
			features = 'qt4 cxx cxxprogram',
			uselib   = 'QTCORE QTGUI QTOPENGL QTSVG',
			source   = 'main.cpp textures.qrc aboutDialog.ui',
			target   = 'window',
		)

Here, the UI description and resource files will be processed
to generate code.

Usage
=====

Load the "qt4" tool.

You also need to edit your sources accordingly:

- the normal way of doing things is to have your C++ files
  include the .moc file.
  This is regarded as the best practice (and provides much faster
  compilations).
  It also implies that the include paths have beenset properly.

- to have the include paths added automatically, use the following::

     from waflib.TaskGen import feature, before_method, after_method
     @feature('cxx')
     @after_method('process_source')
     @before_method('apply_incpaths')
     def add_includes_paths(self):
        incs = set(self.to_list(getattr(self, 'includes', '')))
        for x in self.compiled_tasks:
            incs.add(x.inputs[0].parent.path_from(self.path))
        self.includes = sorted(incs)

Note: another tool provides Qt processing that does not require
.moc includes, see 'playground/slow_qt/'.

A few options (--qt{dir,bin,...}) and environment variables
(QT4_{ROOT,DIR,MOC,UIC,XCOMPILE}) allow finer tuning of the tool,
tool path selection, etc; please read the source for more info.

"""

try:
	from xml.sax import make_parser
	from xml.sax.handler import ContentHandler
except ImportError:
	has_xml = False
	ContentHandler = object
else:
	has_xml = True

import os, sys
from waflib.Tools import cxx
from waflib import Task, Utils, Options, Errors, Context
from waflib.TaskGen import feature, after_method, extension
from waflib.Configure import conf
from waflib import Logs

MOC_H = ['.h', '.hpp', '.hxx', '.hh']
"""
File extensions associated to the .moc files
"""

EXT_RCC = ['.qrc']
"""
File extension for the resource (.qrc) files
"""

EXT_UI  = ['.ui']
"""
File extension for the user interface (.ui) files
"""

EXT_QT4 = ['.cpp', '.cc', '.cxx', '.C']
"""
File extensions of C++ files that may require a .moc processing
"""

QT4_LIBS = "QtCore QtGui QtUiTools QtNetwork QtOpenGL QtSql QtSvg QtTest QtXml QtXmlPatterns QtWebKit Qt3Support QtHelp QtScript QtDeclarative QtDesigner"

class qxx(Task.classes['cxx']):
	"""
	Each C++ file can have zero or several .moc files to create.
	They are known only when the files are scanned (preprocessor)
	To avoid scanning the c++ files each time (parsing C/C++), the results
	are retrieved from the task cache (bld.node_deps/bld.raw_deps).
	The moc tasks are also created *dynamically* during the build.
	"""

	def __init__(self, *k, **kw):
		Task.Task.__init__(self, *k, **kw)
		self.moc_done = 0

	def runnable_status(self):
		"""
		Compute the task signature to make sure the scanner was executed. Create the
		moc tasks by using :py:meth:`waflib.Tools.qt4.qxx.add_moc_tasks` (if necessary),
		then postpone the task execution (there is no need to recompute the task signature).
		"""
		if self.moc_done:
			return Task.Task.runnable_status(self)
		else:
			for t in self.run_after:
				if not t.hasrun:
					return Task.ASK_LATER
			self.add_moc_tasks()
			return Task.Task.runnable_status(self)

	def create_moc_task(self, h_node, m_node):
		"""
		If several libraries use the same classes, it is possible that moc will run several times (Issue 1318)
		It is not possible to change the file names, but we can assume that the moc transformation will be identical,
		and the moc tasks can be shared in a global cache.

		The defines passed to moc will then depend on task generator order. If this is not acceptable, then
		use the tool slow_qt4 instead (and enjoy the slow builds... :-( )
		"""
		try:
			moc_cache = self.generator.bld.moc_cache
		except AttributeError:
			moc_cache = self.generator.bld.moc_cache = {}

		try:
			return moc_cache[h_node]
		except KeyError:
			tsk = moc_cache[h_node] = Task.classes['moc'](env=self.env, generator=self.generator)
			tsk.set_inputs(h_node)
			tsk.set_outputs(m_node)

			if self.generator:
				self.generator.tasks.append(tsk)

			# direct injection in the build phase (safe because called from the main thread)
			gen = self.generator.bld.producer
			gen.outstanding.append(tsk)
			gen.total += 1

			return tsk

	def moc_h_ext(self):
		ext = []
		try:
			ext = Options.options.qt_header_ext.split()
		except AttributeError:
			pass
		if not ext:
			ext = MOC_H
		return ext

	def add_moc_tasks(self):
		"""
		Create the moc tasks by looking in ``bld.raw_deps[self.uid()]``
		"""
		node = self.inputs[0]
		bld = self.generator.bld

		try:
			# compute the signature once to know if there is a moc file to create
			self.signature()
		except KeyError:
			# the moc file may be referenced somewhere else
			pass
		else:
			# remove the signature, it must be recomputed with the moc task
			delattr(self, 'cache_sig')

		include_nodes = [node.parent] + self.generator.includes_nodes

		moctasks = []
		mocfiles = set()
		for d in bld.raw_deps.get(self.uid(), []):
			if not d.endswith('.moc'):
				continue

			# process that base.moc only once
			if d in mocfiles:
				continue
			mocfiles.add(d)

			# find the source associated with the moc file
			h_node = None

			base2 = d[:-4]
			for x in include_nodes:
				for e in self.moc_h_ext():
					h_node = x.find_node(base2 + e)
					if h_node:
						break
				if h_node:
					m_node = h_node.change_ext('.moc')
					break
			else:
				# foo.cpp -> foo.cpp.moc
				for k in EXT_QT4:
					if base2.endswith(k):
						for x in include_nodes:
							h_node = x.find_node(base2)
							if h_node:
								break
						if h_node:
							m_node = h_node.change_ext(k + '.moc')
							break

			if not h_node:
				raise Errors.WafError('No source found for %r which is a moc file' % d)

			# create the moc task
			task = self.create_moc_task(h_node, m_node)
			moctasks.append(task)

		# simple scheduler dependency: run the moc task before others
		self.run_after.update(set(moctasks))
		self.moc_done = 1

class trans_update(Task.Task):
	"""Update a .ts files from a list of C++ files"""
	run_str = '${QT_LUPDATE} ${SRC} -ts ${TGT}'
	color   = 'BLUE'

class XMLHandler(ContentHandler):
	"""
	Parser for *.qrc* files
	"""
	def __init__(self):
		self.buf = []
		self.files = []
	def startElement(self, name, attrs):
		if name == 'file':
			self.buf = []
	def endElement(self, name):
		if name == 'file':
			self.files.append(str(''.join(self.buf)))
	def characters(self, cars):
		self.buf.append(cars)

@extension(*EXT_RCC)
def create_rcc_task(self, node):
	"Create rcc and cxx tasks for *.qrc* files"
	rcnode = node.change_ext('_rc.cpp')
	self.create_task('rcc', node, rcnode)
	cpptask = self.create_task('cxx', rcnode, rcnode.change_ext('.o'))
	try:
		self.compiled_tasks.append(cpptask)
	except AttributeError:
		self.compiled_tasks = [cpptask]
	return cpptask

@extension(*EXT_UI)
def create_uic_task(self, node):
	"hook for uic tasks"
	uictask = self.create_task('ui4', node)
	uictask.outputs = [self.path.find_or_declare(self.env['ui_PATTERN'] % node.name[:-3])]

@extension('.ts')
def add_lang(self, node):
	"""add all the .ts file into self.lang"""
	self.lang = self.to_list(getattr(self, 'lang', [])) + [node]

@feature('qt4')
@after_method('apply_link')
def apply_qt4(self):
	"""
	Add MOC_FLAGS which may be necessary for moc::

		def build(bld):
			bld.program(features='qt4', source='main.cpp', target='app', use='QTCORE')

	The additional parameters are:

	:param lang: list of translation files (\\*.ts) to process
	:type lang: list of :py:class:`waflib.Node.Node` or string without the .ts extension
	:param update: whether to process the C++ files to update the \\*.ts files (use **waf --translate**)
	:type update: bool
	:param langname: if given, transform the \\*.ts files into a .qrc files to include in the binary file
	:type langname: :py:class:`waflib.Node.Node` or string without the .qrc extension
	"""
	if getattr(self, 'lang', None):
		qmtasks = []
		for x in self.to_list(self.lang):
			if isinstance(x, str):
				x = self.path.find_resource(x + '.ts')
			qmtasks.append(self.create_task('ts2qm', x, x.change_ext('.qm')))

		if getattr(self, 'update', None) and Options.options.trans_qt4:
			cxxnodes = [a.inputs[0] for a in self.compiled_tasks] + [
				a.inputs[0] for a in self.tasks if getattr(a, 'inputs', None) and a.inputs[0].name.endswith('.ui')]
			for x in qmtasks:
				self.create_task('trans_update', cxxnodes, x.inputs)

		if getattr(self, 'langname', None):
			qmnodes = [x.outputs[0] for x in qmtasks]
			rcnode = self.langname
			if isinstance(rcnode, str):
				rcnode = self.path.find_or_declare(rcnode + '.qrc')
			t = self.create_task('qm2rcc', qmnodes, rcnode)
			k = create_rcc_task(self, t.outputs[0])
			self.link_task.inputs.append(k.outputs[0])

	lst = []
	for flag in self.to_list(self.env['CXXFLAGS']):
		if len(flag) < 2:
			continue
		f = flag[0:2]
		if f in ('-D', '-I', '/D', '/I'):
			if (f[0] == '/'):
				lst.append('-' + flag[1:])
			else:
				lst.append(flag)
	self.env.append_value('MOC_FLAGS', lst)

@extension(*EXT_QT4)
def cxx_hook(self, node):
	"""
	Re-map C++ file extensions to the :py:class:`waflib.Tools.qt4.qxx` task.
	"""
	return self.create_compiled_task('qxx', node)

class rcc(Task.Task):
	"""
	Process *.qrc* files
	"""
	color   = 'BLUE'
	run_str = '${QT_RCC} -name ${tsk.rcname()} ${SRC[0].abspath()} ${RCC_ST} -o ${TGT}'
	ext_out = ['.h']

	def rcname(self):
		return os.path.splitext(self.inputs[0].name)[0]

	def scan(self):
		"""Parse the *.qrc* files"""
		if not has_xml:
			Logs.error('no xml support was found, the rcc dependencies will be incomplete!')
			return ([], [])

		parser = make_parser()
		curHandler = XMLHandler()
		parser.setContentHandler(curHandler)
		fi = open(self.inputs[0].abspath(), 'r')
		try:
			parser.parse(fi)
		finally:
			fi.close()

		nodes = []
		names = []
		root = self.inputs[0].parent
		for x in curHandler.files:
			nd = root.find_resource(x)
			if nd:
				nodes.append(nd)
			else:
				names.append(x)
		return (nodes, names)

class moc(Task.Task):
	"""
	Create *.moc* files
	"""
	color   = 'BLUE'
	run_str = '${QT_MOC} ${MOC_FLAGS} ${MOCCPPPATH_ST:INCPATHS} ${MOCDEFINES_ST:DEFINES} ${SRC} ${MOC_ST} ${TGT}'
	def keyword(self):
		return "Creating"
	def __str__(self):
		return self.outputs[0].path_from(self.generator.bld.launch_node())

class ui4(Task.Task):
	"""
	Process *.ui* files
	"""
	color   = 'BLUE'
	run_str = '${QT_UIC} ${SRC} -o ${TGT}'
	ext_out = ['.h']

class ts2qm(Task.Task):
	"""
	Create *.qm* files from *.ts* files
	"""
	color   = 'BLUE'
	run_str = '${QT_LRELEASE} ${QT_LRELEASE_FLAGS} ${SRC} -qm ${TGT}'

class qm2rcc(Task.Task):
	"""
	Transform *.qm* files into *.rc* files
	"""
	color = 'BLUE'
	after = 'ts2qm'

	def run(self):
		"""Create a qrc file including the inputs"""
		txt = '\n'.join(['<file>%s</file>' % k.path_from(self.outputs[0].parent) for k in self.inputs])
		code = '<!DOCTYPE RCC><RCC version="1.0">\n<qresource>\n%s\n</qresource>\n</RCC>' % txt
		self.outputs[0].write(code)

def configure(self):
	"""
	Besides the configuration options, the environment variable QT4_ROOT may be used
	to give the location of the qt4 libraries (absolute path).

	The detection will use the program *pkg-config* through :py:func:`waflib.Tools.config_c.check_cfg`
	"""
	self.find_qt4_binaries()
	self.set_qt4_libs_to_check()
	self.set_qt4_defines()
	self.find_qt4_libraries()
	self.add_qt4_rpath()
	self.simplify_qt4_libs()

@conf
def find_qt4_binaries(self):
	env = self.env
	opt = Options.options

	qtdir = getattr(opt, 'qtdir', '')
	qtbin = getattr(opt, 'qtbin', '')

	paths = []

	if qtdir:
		qtbin = os.path.join(qtdir, 'bin')

	# the qt directory has been given from QT4_ROOT - deduce the qt binary path
	if not qtdir:
		qtdir = os.environ.get('QT4_ROOT', '')
		qtbin = os.environ.get('QT4_BIN') or os.path.join(qtdir, 'bin')

	if qtbin:
		paths = [qtbin]

	# no qtdir, look in the path and in /usr/local/Trolltech
	if not qtdir:
		paths = os.environ.get('PATH', '').split(os.pathsep)
		paths.append('/usr/share/qt4/bin/')
		try:
			lst = Utils.listdir('/usr/local/Trolltech/')
		except OSError:
			pass
		else:
			if lst:
				lst.sort()
				lst.reverse()

				# keep the highest version
				qtdir = '/usr/local/Trolltech/%s/' % lst[0]
				qtbin = os.path.join(qtdir, 'bin')
				paths.append(qtbin)

	# at the end, try to find qmake in the paths given
	# keep the one with the highest version
	cand = None
	prev_ver = ['4', '0', '0']
	for qmk in ('qmake-qt4', 'qmake4', 'qmake'):
		try:
			qmake = self.find_program(qmk, path_list=paths)
		except self.errors.ConfigurationError:
			pass
		else:
			try:
				version = self.cmd_and_log(qmake + ['-query', 'QT_VERSION']).strip()
			except self.errors.WafError:
				pass
			else:
				if version:
					new_ver = version.split('.')
					if new_ver > prev_ver:
						cand = qmake
						prev_ver = new_ver
	if cand:
		self.env.QMAKE = cand
	else:
		self.fatal('Could not find qmake for qt4')

	qtbin = self.cmd_and_log(self.env.QMAKE + ['-query', 'QT_INSTALL_BINS']).strip() + os.sep

	def find_bin(lst, var):
		if var in env:
			return
		for f in lst:
			try:
				ret = self.find_program(f, path_list=paths)
			except self.errors.ConfigurationError:
				pass
			else:
				env[var]=ret
				break

	find_bin(['uic-qt3', 'uic3'], 'QT_UIC3')
	find_bin(['uic-qt4', 'uic'], 'QT_UIC')
	if not env.QT_UIC:
		self.fatal('cannot find the uic compiler for qt4')

	self.start_msg('Checking for uic version')
	uicver = self.cmd_and_log(env.QT_UIC + ["-version"], output=Context.BOTH)
	uicver = ''.join(uicver).strip()
	uicver = uicver.replace('Qt User Interface Compiler ','').replace('User Interface Compiler for Qt', '')
	self.end_msg(uicver)
	if uicver.find(' 3.') != -1:
		self.fatal('this uic compiler is for qt3, add uic for qt4 to your path')

	find_bin(['moc-qt4', 'moc'], 'QT_MOC')
	find_bin(['rcc-qt4', 'rcc'], 'QT_RCC')
	find_bin(['lrelease-qt4', 'lrelease'], 'QT_LRELEASE')
	find_bin(['lupdate-qt4', 'lupdate'], 'QT_LUPDATE')

	env['UIC3_ST']= '%s -o %s'
	env['UIC_ST'] = '%s -o %s'
	env['MOC_ST'] = '-o'
	env['ui_PATTERN'] = 'ui_%s.h'
	env['QT_LRELEASE_FLAGS'] = ['-silent']
	env.MOCCPPPATH_ST = '-I%s'
	env.MOCDEFINES_ST = '-D%s'

@conf
def find_qt4_libraries(self):
	qtlibs = getattr(Options.options, 'qtlibs', None) or os.environ.get("QT4_LIBDIR")
	if not qtlibs:
		try:
			qtlibs = self.cmd_and_log(self.env.QMAKE + ['-query', 'QT_INSTALL_LIBS']).strip()
		except Errors.WafError:
			qtdir = self.cmd_and_log(self.env.QMAKE + ['-query', 'QT_INSTALL_PREFIX']).strip() + os.sep
			qtlibs = os.path.join(qtdir, 'lib')
	self.msg('Found the Qt4 libraries in', qtlibs)

	qtincludes =  os.environ.get("QT4_INCLUDES") or self.cmd_and_log(self.env.QMAKE + ['-query', 'QT_INSTALL_HEADERS']).strip()
	env = self.env
	if not 'PKG_CONFIG_PATH' in os.environ:
		os.environ['PKG_CONFIG_PATH'] = '%s:%s/pkgconfig:/usr/lib/qt4/lib/pkgconfig:/opt/qt4/lib/pkgconfig:/usr/lib/qt4/lib:/opt/qt4/lib' % (qtlibs, qtlibs)

	try:
		if os.environ.get("QT4_XCOMPILE"):
			raise self.errors.ConfigurationError()
		self.check_cfg(atleast_pkgconfig_version='0.1')
	except self.errors.ConfigurationError:
		for i in self.qt4_vars:
			uselib = i.upper()
			if Utils.unversioned_sys_platform() == "darwin":
				# Since at least qt 4.7.3 each library locates in separate directory
				frameworkName = i + ".framework"
				qtDynamicLib = os.path.join(qtlibs, frameworkName, i)
				if os.path.exists(qtDynamicLib):
					env.append_unique('FRAMEWORK_' + uselib, i)
					self.msg('Checking for %s' % i, qtDynamicLib, 'GREEN')
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtlibs, frameworkName, 'Headers'))
			elif env.DEST_OS != "win32":
				qtDynamicLib = os.path.join(qtlibs, "lib" + i + ".so")
				qtStaticLib = os.path.join(qtlibs, "lib" + i + ".a")
				if os.path.exists(qtDynamicLib):
					env.append_unique('LIB_' + uselib, i)
					self.msg('Checking for %s' % i, qtDynamicLib, 'GREEN')
				elif os.path.exists(qtStaticLib):
					env.append_unique('LIB_' + uselib, i)
					self.msg('Checking for %s' % i, qtStaticLib, 'GREEN')
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))
			else:
				# Release library names are like QtCore4
				for k in ("lib%s.a", "lib%s4.a", "%s.lib", "%s4.lib"):
					lib = os.path.join(qtlibs, k % i)
					if os.path.exists(lib):
						env.append_unique('LIB_' + uselib, i + k[k.find("%s") + 2 : k.find('.')])
						self.msg('Checking for %s' % i, lib, 'GREEN')
						break
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))

				# Debug library names are like QtCore4d
				uselib = i.upper() + "_debug"
				for k in ("lib%sd.a", "lib%sd4.a", "%sd.lib", "%sd4.lib"):
					lib = os.path.join(qtlibs, k % i)
					if os.path.exists(lib):
						env.append_unique('LIB_' + uselib, i + k[k.find("%s") + 2 : k.find('.')])
						self.msg('Checking for %s' % i, lib, 'GREEN')
						break
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))
	else:
		for i in self.qt4_vars_debug + self.qt4_vars:
			self.check_cfg(package=i, args='--cflags --libs', mandatory=False)

@conf
def simplify_qt4_libs(self):
	# the libpaths make really long command-lines
	# remove the qtcore ones from qtgui, etc
	env = self.env
	def process_lib(vars_, coreval):
		for d in vars_:
			var = d.upper()
			if var == 'QTCORE':
				continue

			value = env['LIBPATH_'+var]
			if value:
				core = env[coreval]
				accu = []
				for lib in value:
					if lib in core:
						continue
					accu.append(lib)
				env['LIBPATH_'+var] = accu

	process_lib(self.qt4_vars,       'LIBPATH_QTCORE')
	process_lib(self.qt4_vars_debug, 'LIBPATH_QTCORE_DEBUG')

@conf
def add_qt4_rpath(self):
	# rpath if wanted
	env = self.env
	if getattr(Options.options, 'want_rpath', False):
		def process_rpath(vars_, coreval):
			for d in vars_:
				var = d.upper()
				value = env['LIBPATH_'+var]
				if value:
					core = env[coreval]
					accu = []
					for lib in value:
						if var != 'QTCORE':
							if lib in core:
								continue
						accu.append('-Wl,--rpath='+lib)
					env['RPATH_'+var] = accu
		process_rpath(self.qt4_vars,       'LIBPATH_QTCORE')
		process_rpath(self.qt4_vars_debug, 'LIBPATH_QTCORE_DEBUG')

@conf
def set_qt4_libs_to_check(self):
	if not hasattr(self, 'qt4_vars'):
		self.qt4_vars = QT4_LIBS
	self.qt4_vars = Utils.to_list(self.qt4_vars)
	if not hasattr(self, 'qt4_vars_debug'):
		self.qt4_vars_debug = [a + '_debug' for a in self.qt4_vars]
	self.qt4_vars_debug = Utils.to_list(self.qt4_vars_debug)

@conf
def set_qt4_defines(self):
	if sys.platform != 'win32':
		return
	for x in self.qt4_vars:
		y = x[2:].upper()
		self.env.append_unique('DEFINES_%s' % x.upper(), 'QT_%s_LIB' % y)
		self.env.append_unique('DEFINES_%s_DEBUG' % x.upper(), 'QT_%s_LIB' % y)

def options(opt):
	"""
	Command-line options
	"""
	opt.add_option('--want-rpath', action='store_true', default=False, dest='want_rpath', help='enable the rpath for qt libraries')

	opt.add_option('--header-ext',
		type='string',
		default='',
		help='header extension for moc files',
		dest='qt_header_ext')

	for i in 'qtdir qtbin qtlibs'.split():
		opt.add_option('--'+i, type='string', default='', dest=i)

	opt.add_option('--translate', action="store_true", help="collect translation strings", dest="trans_qt4", default=False)