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#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2005 (ita)

Dependency tree holder

The class Build holds all the info related to a build:
* file system representation (tree of Node instances)
* various cached objects (task signatures, file scan results, ..)

There is only one Build object at a time (bld singleton)

import os, sys, errno, re, glob, gc, datetime, shutil
try: import cPickle
except: import pickle as cPickle
import Runner, TaskGen, Node, Scripting, Utils, Environment, Task, Logs, Options
from Logs import debug, error, info
from Constants import *

SAVED_ATTRS = 'root srcnode bldnode node_sigs node_deps raw_deps task_sigs id_nodes'.split()
"Build class members to save"

bld = None
"singleton - safe to use when Waf is not used as a library"

class BuildError(Utils.WafError):
      def __init__(self, b=None, t=[]):
            self.bld = b
            self.tasks = t
            self.ret = 1
            Utils.WafError.__init__(self, self.format_error())

      def format_error(self):
            lst = ['Build failed']
            for tsk in self.tasks:
                  txt = tsk.format_error()
                  if txt: lst.append(txt)
            return '\n'.join(lst)

def group_method(fun):
      sets a build context method to execute after the current group has finished executing
      this is useful for installing build files:
      * calling install_files/install_as will fail if called too early
      * people do not want to define install method in their task classes

      TODO: try it
      def f(*k, **kw):
            if not k[0].is_install:
                  return False

            postpone = True
            if 'postpone' in kw:
                  postpone = kw['postpone']
                  del kw['postpone']

            # TODO waf 1.6 in theory there should be no reference to the TaskManager internals here
            if postpone:
                  m = k[0].task_manager
                  if not m.groups: m.add_group()
                  m.groups[m.current_group].post_funs.append((fun, k, kw))
                  kw['cwd'] = k[0].path
                  fun(*k, **kw)
      return f

class BuildContext(Utils.Context):
      "holds the dependency tree"
      def __init__(self):

            # not a singleton, but provided for compatibility
            global bld
            bld = self

            self.task_manager = Task.TaskManager()

            # instead of hashing the nodes, we assign them a unique id when they are created
            self.id_nodes = 0
            self.idx = {}

            # map names to environments, the 'default' must be defined
            self.all_envs = {}

            # ======================================= #
            # code for reading the scripts

            # project build directory - do not reset() from load_dirs()
            self.bdir = ''

            # the current directory from which the code is run
            # the folder changes everytime a wscript is read
            self.path = None

            # Manual dependencies.
            self.deps_man = Utils.DefaultDict(list)

            # ======================================= #
            # cache variables

            # local cache for absolute paths - cache_node_abspath[variant][node]
            self.cache_node_abspath = {}

            # list of folders that are already scanned
            # so that we do not need to stat them one more time
            self.cache_scanned_folders = {}

            # list of targets to uninstall for removing the empty folders after uninstalling
            self.uninstall = []

            # ======================================= #
            # tasks and objects

            # build dir variants (release, debug, ..)
            for v in 'cache_node_abspath task_sigs node_deps raw_deps node_sigs'.split():
                  var = {}
                  setattr(self, v, var)

            self.cache_dir_contents = {}

            self.all_task_gen = []
            self.task_gen_cache_names = {}
            self.cache_sig_vars = {}
            self.log = None

            self.root = None
            self.srcnode = None
            self.bldnode = None

            # bind the build context to the nodes in use
            # this means better encapsulation and no build context singleton
            class node_class(Node.Node):
            self.node_class = node_class
            self.node_class.__module__ = "Node"
            self.node_class.__name__ = "Nodu"
            self.node_class.bld = self

            self.is_install = None

      def __copy__(self):
            "nodes are not supposed to be copied"
            raise Utils.WafError('build contexts are not supposed to be cloned')

      def load(self):
            "load the cache from the disk"
                  env = Environment.Environment(os.path.join(self.cachedir, 'build.config.py'))
            except (IOError, OSError):
                  if env['version'] < HEXVERSION:
                        raise Utils.WafError('Version mismatch! reconfigure the project')
                  for t in env['tools']:

                  f = data = None

                  Node.Nodu = self.node_class

                        f = open(os.path.join(self.bdir, DBFILE), 'rb')
                  except (IOError, EOFError):
                        # handle missing file/empty file

                        if f: data = cPickle.load(f)
                  except AttributeError:
                        # handle file of an old Waf version
                        # that has an attribute which no longer exist
                        # (e.g. AttributeError: 'module' object has no attribute 'BuildDTO')
                        if Logs.verbose > 1: raise

                  if data:
                        for x in SAVED_ATTRS: setattr(self, x, data[x])
                        debug('build: Build cache loading failed')

                  if f: f.close()

      def save(self):
            "store the cache on disk, see self.load"
            self.root.__class__.bld = None

            # some people are very nervous with ctrl+c so we have to make a temporary file
            Node.Nodu = self.node_class
            db = os.path.join(self.bdir, DBFILE)
            file = open(db + '.tmp', 'wb')
            data = {}
            for x in SAVED_ATTRS: data[x] = getattr(self, x)
            cPickle.dump(data, file, -1)

            # do not use shutil.move
            try: os.unlink(db)
            except OSError: pass
            os.rename(db + '.tmp', db)
            self.root.__class__.bld = self

      # ======================================= #

      def clean(self):
            debug('build: clean called')

            # does not clean files created during the configuration
            precious = set([])
            for env in self.all_envs.values():
                  for x in env[CFG_FILES]:
                        node = self.srcnode.find_resource(x)
                        if node:

            def clean_rec(node):
                  for x in list(node.childs.keys()):
                        nd = node.childs[x]

                        tp = nd.id & 3
                        if tp == Node.DIR:
                        elif tp == Node.BUILD:
                              if nd.id in precious: continue
                              for env in self.all_envs.values():
                                    try: os.remove(nd.abspath(env))
                                    except OSError: pass


            for v in 'node_sigs node_deps task_sigs raw_deps cache_node_abspath'.split():
                  setattr(self, v, {})

      def compile(self):
            """The cache file is not written if nothing was build at all (build is up to date)"""
            debug('build: compile called')

            import cProfile, pstats
            cProfile.run("import Build\nBuild.bld.flush()", 'profi.txt')
            p = pstats.Stats('profi.txt')

            self.generator = Runner.Parallel(self, Options.options.jobs)

            def dw(on=True):
                  if Options.options.progress_bar:
                        if on: sys.stderr.write(Logs.colors.cursor_on)
                        else: sys.stderr.write(Logs.colors.cursor_off)

            debug('build: executor starting')

            back = os.getcwd()

                  except KeyboardInterrupt:
                        if self.generator.consumers:
                  except Exception:
                        # do not store anything, for something bad happened
                        if self.generator.consumers:

                  if self.generator.error:
                        raise BuildError(self, self.task_manager.tasks_done)


      def install(self):
            "this function is called for both install and uninstall"
            debug('build: install called')


            # remove empty folders after uninstalling
            if self.is_install < 0:
                  lst = []
                  for x in self.uninstall:
                        dir = os.path.dirname(x)
                        if not dir in lst: lst.append(dir)

                  nlst = []
                  for y in lst:
                        x = y
                        while len(x) > 4:
                              if not x in nlst: nlst.append(x)
                              x = os.path.dirname(x)

                  for x in nlst:
                        try: os.rmdir(x)
                        except OSError: pass

      def new_task_gen(self, *k, **kw):
            kw['bld'] = self
            if len(k) == 0:
                  ret = TaskGen.task_gen(*k, **kw)
                  cls_name = k[0]

                  try: cls = TaskGen.task_gen.classes[cls_name]
                  except KeyError: raise Utils.WscriptError('%s is not a valid task generator -> %s' %
                        (cls_name, [x for x in TaskGen.task_gen.classes]))
                  ret = cls(*k, **kw)
            return ret

      def load_envs(self):
                  lst = Utils.listdir(self.cachedir)
            except OSError, e:
                  if e.errno == errno.ENOENT:
                        raise Utils.WafError('The project was not configured: run "waf configure" first!')

            if not lst:
                  raise Utils.WafError('The cache directory is empty: reconfigure the project')

            for file in lst:
                  if file.endswith(CACHE_SUFFIX):
                        env = Environment.Environment(os.path.join(self.cachedir, file))
                        name = file[:-len(CACHE_SUFFIX)]

                        self.all_envs[name] = env


            for env in self.all_envs.values():
                  for f in env[CFG_FILES]:
                        newnode = self.path.find_or_declare(f)
                              hash = Utils.h_file(newnode.abspath(env))
                        except (IOError, AttributeError):
                              error("cannot find "+f)
                              hash = SIG_NIL
                        self.node_sigs[env.variant()][newnode.id] = hash

            # TODO: hmmm, these nodes are removed from the tree when calling rescan()
            self.bldnode = self.root.find_dir(self.bldnode.abspath())
            self.path = self.srcnode = self.root.find_dir(self.srcnode.abspath())
            self.cwd = self.bldnode.abspath()

      def setup(self, tool, tooldir=None, funs=None):
            "setup tools for build process"
            if isinstance(tool, list):
                  for i in tool: self.setup(i, tooldir)

            if not tooldir: tooldir = Options.tooldir

            module = Utils.load_tool(tool, tooldir)
            if hasattr(module, "setup"): module.setup(self)

      def init_variants(self):
            debug('build: init variants')

            lstvariants = []
            for env in self.all_envs.values():
                  if not env.variant() in lstvariants:
            self.lst_variants = lstvariants

            debug('build: list of variants is %r' % lstvariants)

            for name in lstvariants+[0]:
                  for v in 'node_sigs cache_node_abspath'.split():
                        var = getattr(self, v)
                        if not name in var:
                              var[name] = {}

      # ======================================= #
      # node and folder handling

      # this should be the main entry point
      def load_dirs(self, srcdir, blddir, load_cache=1):
            "this functions should be the start of everything"


            self.cachedir = os.path.join(blddir, CACHE_DIR)

            if srcdir == blddir:
                  raise Utils.WafError("build dir must be different from srcdir: %s <-> %s " % (srcdir, blddir))

            self.bdir = blddir

            # try to load the cache file, if it does not exist, nothing happens

            if not self.root:
                  Node.Nodu = self.node_class
                  self.root = Node.Nodu('', None, Node.DIR)

            if not self.srcnode:
                  self.srcnode = self.root.ensure_dir_node_from_path(srcdir)
            debug('build: srcnode is %s and srcdir %s' % (self.srcnode.name, srcdir))

            self.path = self.srcnode

            # create this build dir if necessary
            try: os.makedirs(blddir)
            except OSError: pass

            if not self.bldnode:
                  self.bldnode = self.root.ensure_dir_node_from_path(blddir)


      def rescan(self, src_dir_node):
            look the contents of a (folder)node and update its list of childs

            The intent is to perform the following steps
            * remove the nodes for the files that have disappeared
            * remove the signatures for the build files that have disappeared
            * cache the results of os.listdir
            * create the build folder equivalent (mkdir) for each variant
            src/bar -> build/default/src/bar, build/release/src/bar

            when a folder in the source directory is removed, we do not check recursively
            to remove the unused nodes. To do that, call 'waf clean' and build again.

            # do not rescan over and over again
            # TODO use a single variable in waf 1.6
            if self.cache_scanned_folders.get(src_dir_node.id, None): return
            self.cache_scanned_folders[src_dir_node.id] = True

            # TODO remove in waf 1.6
            if hasattr(self, 'repository'): self.repository(src_dir_node)

            if not src_dir_node.name and sys.platform == 'win32':
                  # the root has no name, contains drive letters, and cannot be listed

            # first, take the case of the source directory
            parent_path = src_dir_node.abspath()
                  lst = set(Utils.listdir(parent_path))
            except OSError:
                  lst = set([])

            # TODO move this at the bottom
            self.cache_dir_contents[src_dir_node.id] = lst

            # hash the existing source files, remove the others
            cache = self.node_sigs[0]
            for x in src_dir_node.childs.values():
                  if x.id & 3 != Node.FILE: continue
                  if x.name in lst:
                              cache[x.id] = Utils.h_file(x.abspath())
                        except IOError:
                              raise Utils.WafError('The file %s is not readable or has become a dir' % x.abspath())
                        try: del cache[x.id]
                        except KeyError: pass

                        del src_dir_node.childs[x.name]

            # first obtain the differences between srcnode and src_dir_node
            h1 = self.srcnode.height()
            h2 = src_dir_node.height()

            lst = []
            child = src_dir_node
            while h2 > h1:
                  child = child.parent
                  h2 -= 1

            # list the files in the build dirs
            # remove the existing timestamps if the build files are removed
            for variant in self.lst_variants:
                  sub_path = os.path.join(self.bldnode.abspath(), variant , *lst)
                        self.listdir_bld(src_dir_node, sub_path, variant)
                  except OSError:
                        #debug('build: osError on ' + sub_path)
                        # listdir failed, remove all sigs of nodes
                        # TODO more things to remove?
                        dict = self.node_sigs[variant]
                        for node in src_dir_node.childs.values():
                              if node.id in dict:

                              # avoid deleting the build dir node
                              if node.id != self.bldnode.id:

      # ======================================= #
      def listdir_src(self, parent_node):
            """do not use, kept for compatibility"""

      def remove_node(self, node):
            """do not use, kept for compatibility"""

      def listdir_bld(self, parent_node, path, variant):
            """in this method we do not add timestamps but we remove them
            when the files no longer exist (file removed in the build dir)"""

            i_existing_nodes = [x for x in parent_node.childs.values() if x.id & 3 == Node.BUILD]

            lst = set(Utils.listdir(path))
            node_names = set([x.name for x in i_existing_nodes])
            remove_names = node_names - lst

            # remove the stamps of the build nodes that no longer exist on the filesystem
            ids_to_remove = [x.id for x in i_existing_nodes if x.name in remove_names]
            cache = self.node_sigs[variant]
            for nid in ids_to_remove:
                  if nid in cache:

      def get_env(self):
            return self.env_of_name('default')
      def set_env(self, name, val):
            self.all_envs[name] = val

      env = property(get_env, set_env)

      def add_manual_dependency(self, path, value):
            if isinstance(path, Node.Node):
                  node = path
            elif os.path.isabs(path):
                  node = self.root.find_resource(path)
                  node = self.path.find_resource(path)

      def launch_node(self):
            """return the launch directory as a node"""
            # p_ln is kind of private, but public in case if
                  return self.p_ln
            except AttributeError:
                  self.p_ln = self.root.find_dir(Options.launch_dir)
                  return self.p_ln

      def glob(self, pattern, relative=True):
            "files matching the pattern, seen from the current folder"
            path = self.path.abspath()
            files = [self.root.find_resource(x) for x in glob.glob(path+os.sep+pattern)]
            if relative:
                  files = [x.path_to_parent(self.path) for x in files if x]
                  files = [x.abspath() for x in files if x]
            return files

      ## the following methods are candidates for the stable apis ##

      def add_group(self, *k):

      def set_group(self, *k, **kw):
            self.task_manager.set_group(*k, **kw)

      def hash_env_vars(self, env, vars_lst):
            """hash environment variables
            ['CXX', ..] -> [env['CXX'], ..] -> md5()"""

            # ccroot objects use the same environment for building the .o at once
            # the same environment and the same variables are used

            idx = str(id(env)) + str(vars_lst)
            try: return self.cache_sig_vars[idx]
            except KeyError: pass

            lst = [str(env[a]) for a in vars_lst]
            ret = Utils.h_list(lst)
            debug("envhash: %r %r" % (ret, lst))

            # next time
            self.cache_sig_vars[idx] = ret
            return ret

      def name_to_obj(self, name, env):
            """retrieve a task generator from its name or its target name
            remember that names must be unique"""
            cache = self.task_gen_cache_names
            if not cache:
                  # create the index lazily
                  for x in self.all_task_gen:
                        vt = x.env.variant() + '_'
                        if x.name:
                              cache[vt + x.name] = x
                              if isinstance(x.target, str):
                                    target = x.target
                                    target = ' '.join(x.target)
                              v = vt + target
                              if not cache.get(v, None):
                                    cache[v] = x
            return cache.get(env.variant() + '_' + name, None)

      def flush(self, all=1):
            """tell the task generators to create the tasks"""

            self.ini = datetime.datetime.now()
            # force the initialization of the mapping name->object in flush
            # name_to_obj can be used in userland scripts, in that case beware of incomplete mapping
            self.task_gen_cache_names = {}
            self.name_to_obj('', self.env)

            debug('build: delayed operation TaskGen.flush() called')

            if Options.options.compile_targets:
                  debug('task_gen: posting objects listed in compile_targets')

                  # ensure the target names exist, fail before any post()
                  target_objects = Utils.DefaultDict(list)
                  for target_name in Options.options.compile_targets.split(','):
                        # trim target_name (handle cases when the user added spaces to targets)
                        target_name = target_name.strip()
                        for env in self.all_envs.values():
                              obj = self.name_to_obj(target_name, env)
                              if obj:
                        if not target_name in target_objects and all:
                              raise Utils.WafError("target '%s' does not exist" % target_name)

                  to_compile = []
                  for x in target_objects.values():
                        for y in x:

                  # tasks must be posted in order of declaration
                  # we merely apply a filter to discard the ones we are not interested in
                  for i in xrange(len(self.task_manager.groups)):
                        g = self.task_manager.groups[i]
                        self.task_manager.current_group = i
                        for tg in g.tasks_gen:
                              if id(tg) in to_compile:

                  debug('task_gen: posting objects (normal)')
                  ln = self.launch_node()
                  # if the build is started from the build directory, do as if it was started from the top-level
                  # for the pretty-printing (Node.py), the two lines below cannot be moved to Build::launch_node
                  if ln.is_child_of(self.bldnode) or not ln.is_child_of(self.srcnode):
                        ln = self.srcnode

                  # if the project file is located under the source directory, build all targets by default
                  # else 'waf configure build' does nothing
                  proj_node = self.root.find_dir(os.path.split(Utils.g_module.root_path)[0])
                  if proj_node.id != self.srcnode.id:
                        ln = self.srcnode

                  for i in xrange(len(self.task_manager.groups)):
                        g = self.task_manager.groups[i]
                        self.task_manager.current_group = i
                        for tg in g.tasks_gen:
                              if not tg.path.is_child_of(ln):

      def env_of_name(self, name):
                  return self.all_envs[name]
            except KeyError:
                  error('no such environment: '+name)
                  return None

      def progress_line(self, state, total, col1, col2):
            n = len(str(total))

            Utils.rot_idx += 1
            ind = Utils.rot_chr[Utils.rot_idx % 4]

            ini = self.ini

            pc = (100.*state)/total
            eta = Utils.get_elapsed_time(ini)
            fs = "[%%%dd/%%%dd][%%s%%2d%%%%%%s][%s][" % (n, n, ind)
            left = fs % (state, total, col1, pc, col2)
            right = '][%s%s%s]' % (col1, eta, col2)

            cols = Utils.get_term_cols() - len(left) - len(right) + 2*len(col1) + 2*len(col2)
            if cols < 7: cols = 7

            ratio = int((cols*state)/total) - 1

            bar = ('='*ratio+'>').ljust(cols)
            msg = Utils.indicator % (left, bar, right)

            return msg

      # do_install is not used anywhere
      def do_install(self, src, tgt, chmod=O644):
            """returns true if the file was effectively installed or uninstalled, false otherwise"""
            if self.is_install > 0:
                  if not Options.options.force:
                        # check if the file is already there to avoid a copy
                              st1 = os.stat(tgt)
                              st2 = os.stat(src)
                        except OSError:
                              # same size and identical timestamps -> make no copy
                              if st1.st_mtime >= st2.st_mtime and st1.st_size == st2.st_size:
                                    return False

                  srclbl = src.replace(self.srcnode.abspath(None)+os.sep, '')
                  info("* installing %s as %s" % (srclbl, tgt))

                  # following is for shared libs and stale inodes (-_-)
                  try: os.remove(tgt)
                  except OSError: pass

                        shutil.copy2(src, tgt)
                        os.chmod(tgt, chmod)
                  except IOError:
                        except (OSError, IOError):
                              error('File %r does not exist' % src)
                        raise Utils.WafError('Could not install the file %r' % tgt)
                  return True

            elif self.is_install < 0:
                  info("* uninstalling %s" % tgt)


                  except OSError, e:
                        if e.errno != errno.ENOENT:
                              if not getattr(self, 'uninstall_error', None):
                                    self.uninstall_error = True
                                    Logs.warn('build: some files could not be uninstalled (retry with -vv to list them)')
                              if Logs.verbose > 1:
                                    Logs.warn('could not remove %s (error code %r)' % (e.filename, e.errno))
                  return True

      def get_install_path(self, path, env=None):
            "installation path prefixed by the destdir, the variables like in '${PREFIX}/bin' are substituted"
            if not env: env = self.env
            destdir = env.get_destdir()
            path = path.replace('/', os.sep)
            destpath = Utils.subst_vars(path, env)
            if destdir:
                  destpath = os.path.join(destdir, destpath.lstrip(os.sep))
            return destpath

      def install_files(self, path, files, env=None, chmod=O644, relative_trick=False, cwd=None):
            """To install files only after they have been built, put the calls in a method named
            post_build on the top-level wscript

            The files must be a list and contain paths as strings or as Nodes

            The relative_trick flag can be set to install folders, use bld.path.ant_glob() with it
            if env:
                  assert isinstance(env, Environment.Environment), "invalid parameter"
                  env = self.env

            if not path: return []

            if not cwd:
                  cwd = self.path

            if isinstance(files, str) and '*' in files:
                  gl = cwd.abspath() + os.sep + files
                  lst = glob.glob(gl)
                  lst = Utils.to_list(files)

            if not getattr(lst, '__iter__', False):
                  lst = [lst]

            destpath = self.get_install_path(path, env)


            installed_files = []
            for filename in lst:
                  if isinstance(filename, str) and os.path.isabs(filename):
                        alst = Utils.split_path(filename)
                        destfile = os.path.join(destpath, alst[-1])
                        if isinstance(filename, Node.Node):
                              nd = filename
                              nd = cwd.find_resource(filename)
                        if not nd:
                              raise Utils.WafError("Unable to install the file %r (not found in %s)" % (filename, cwd))

                        if relative_trick:
                              destfile = os.path.join(destpath, filename)
                              destfile = os.path.join(destpath, nd.name)

                        filename = nd.abspath(env)

                  if self.do_install(filename, destfile, chmod):
            return installed_files

      def install_as(self, path, srcfile, env=None, chmod=O644, cwd=None):
            srcfile may be a string or a Node representing the file to install

            returns True if the file was effectively installed, False otherwise
            if env:
                  assert isinstance(env, Environment.Environment), "invalid parameter"
                  env = self.env

            if not path:
                  raise Utils.WafError("where do you want to install %r? (%r?)" % (srcfile, path))

            if not cwd:
                  cwd = self.path

            destpath = self.get_install_path(path, env)

            dir, name = os.path.split(destpath)

            # the source path
            if isinstance(srcfile, Node.Node):
                  src = srcfile.abspath(env)
                  src = srcfile
                  if not os.path.isabs(srcfile):
                        node = cwd.find_resource(srcfile)
                        if not node:
                              raise Utils.WafError("Unable to install the file %r (not found in %s)" % (srcfile, cwd))
                        src = node.abspath(env)

            return self.do_install(src, destpath, chmod)

      def symlink_as(self, path, src, env=None, cwd=None):
            """example:  bld.symlink_as('${PREFIX}/lib/libfoo.so', 'libfoo.so.1.2.3') """

            if sys.platform == 'win32':
                  # well, this *cannot* work

            if not path:
                  raise Utils.WafError("where do you want to install %r? (%r?)" % (src, path))

            tgt = self.get_install_path(path, env)

            dir, name = os.path.split(tgt)

            if self.is_install > 0:
                  link = False
                  if not os.path.islink(tgt):
                        link = True
                  elif os.readlink(tgt) != src:
                        link = True
                        try: os.remove(tgt)
                        except OSError: pass

                  if link:
                        info('* symlink %s (-> %s)' % (tgt, src))
                        os.symlink(src, tgt)
                  return 0

            else: # UNINSTALL
                        info('* removing %s' % (tgt))
                        return 0
                  except OSError:
                        return 1

      def exec_command(self, cmd, **kw):
            # 'runner' zone is printed out for waf -v, see wafadmin/Options.py
            debug('runner: system command -> %s' % cmd)
            if self.log:
                  self.log.write('%s\n' % cmd)
                  kw['log'] = self.log
                  if not kw.get('cwd', None):
                        kw['cwd'] = self.cwd
            except AttributeError:
                  self.cwd = kw['cwd'] = self.bldnode.abspath()
            return Utils.exec_command(cmd, **kw)

      def printout(self, s):
            f = self.log or sys.stderr

      def add_subdirs(self, dirs):
            self.recurse(dirs, 'build')

      def pre_recurse(self, name_or_mod, path, nexdir):
            if not hasattr(self, 'oldpath'):
                  self.oldpath = []
            self.path = self.root.find_dir(nexdir)
            return {'bld': self, 'ctx': self}

      def post_recurse(self, name_or_mod, path, nexdir):
            self.path = self.oldpath.pop()

      ###### user-defined behaviour

      def pre_build(self):
            if hasattr(self, 'pre_funs'):
                  for m in self.pre_funs:

      def post_build(self):
            if hasattr(self, 'post_funs'):
                  for m in self.post_funs:

      def add_pre_fun(self, meth):
            try: self.pre_funs.append(meth)
            except AttributeError: self.pre_funs = [meth]

      def add_post_fun(self, meth):
            try: self.post_funs.append(meth)
            except AttributeError: self.post_funs = [meth]

      def use_the_magic(self):
            Task.algotype = Task.MAXPARALLEL
            Task.file_deps = Task.extract_deps

      install_as = group_method(install_as)
      install_files = group_method(install_files)
      symlink_as = group_method(symlink_as)

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