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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
__doc__ = """
SCons interactive mode
"""
# TODO:
#
# This has the potential to grow into something with a really big life
# of its own, which might or might not be a good thing. Nevertheless,
# here are some enhancements that will probably be requested some day
# and are worth keeping in mind (assuming this takes off):
#
# - A command to re-read / re-load the SConscript files. This may
# involve allowing people to specify command-line options (e.g. -f,
# -I, --no-site-dir) that affect how the SConscript files are read.
#
# - Additional command-line options on the "build" command.
#
# Of the supported options that seemed to make sense (after a quick
# pass through the list), the ones that seemed likely enough to be
# used are listed in the man page and have explicit test scripts.
#
# These had code changed in Script/Main.py to support them, but didn't
# seem likely to be used regularly, so had no test scripts added:
#
# build --diskcheck=*
# build --implicit-cache=*
# build --implicit-deps-changed=*
# build --implicit-deps-unchanged=*
#
# These look like they should "just work" with no changes to the
# existing code, but like those above, look unlikely to be used and
# therefore had no test scripts added:
#
# build --random
#
# These I'm not sure about. They might be useful for individual
# "build" commands, and may even work, but they seem unlikely enough
# that we'll wait until they're requested before spending any time on
# writing test scripts for them, or investigating whether they work.
#
# build -q [??? is there a useful analog to the exit status?]
# build --duplicate=
# build --profile=
# build --max-drift=
# build --warn=*
# build --Y
#
# - Most of the SCons command-line options that the "build" command
# supports should be settable as default options that apply to all
# subsequent "build" commands. Maybe a "set {option}" command that
# maps to "SetOption('{option}')".
#
# - Need something in the 'help' command that prints the -h output.
#
# - A command to run the configure subsystem separately (must see how
# this interacts with the new automake model).
#
# - Command-line completion of target names; maybe even of SCons options?
# Completion is something that's supported by the Python cmd module,
# so this should be doable without too much trouble.
#
import cmd
import copy
import os
import re
import shlex
import sys
try:
import readline
except ImportError:
pass
[docs]class SConsInteractiveCmd(cmd.Cmd):
"""\
build [TARGETS] Build the specified TARGETS and their dependencies. 'b' is a synonym.
clean [TARGETS] Clean (remove) the specified TARGETS and their dependencies. 'c' is a synonym.
exit Exit SCons interactive mode.
help [COMMAND] Prints help for the specified COMMAND. 'h' and '?' are synonyms.
shell [COMMANDLINE] Execute COMMANDLINE in a subshell. 'sh' and '!' are synonyms.
version Prints SCons version information.
"""
synonyms = {
'b' : 'build',
'c' : 'clean',
'h' : 'help',
'scons' : 'build',
'sh' : 'shell',
}
def __init__(self, **kw):
cmd.Cmd.__init__(self)
for key, val in kw.items():
setattr(self, key, val)
if sys.platform == 'win32':
self.shell_variable = 'COMSPEC'
else:
self.shell_variable = 'SHELL'
[docs] def default(self, argv):
print("*** Unknown command: %s" % argv[0])
[docs] def onecmd(self, line):
line = line.strip()
if not line:
print(self.lastcmd)
return self.emptyline()
self.lastcmd = line
if line[0] == '!':
line = 'shell ' + line[1:]
elif line[0] == '?':
line = 'help ' + line[1:]
if os.sep == '\\':
line = line.replace('\\', '\\\\')
argv = shlex.split(line)
argv[0] = self.synonyms.get(argv[0], argv[0])
if not argv[0]:
return self.default(line)
else:
try:
func = getattr(self, 'do_' + argv[0])
except AttributeError:
return self.default(argv)
return func(argv)
[docs] def do_build(self, argv):
"""\
build [TARGETS] Build the specified TARGETS and their
dependencies. 'b' is a synonym.
"""
import SCons.Node
import SCons.SConsign
import SCons.Script.Main
options = copy.deepcopy(self.options)
options, targets = self.parser.parse_args(argv[1:], values=options)
SCons.Script.COMMAND_LINE_TARGETS = targets
if targets:
SCons.Script.BUILD_TARGETS = targets
else:
# If the user didn't specify any targets on the command line,
# use the list of default targets.
SCons.Script.BUILD_TARGETS = SCons.Script._build_plus_default
nodes = SCons.Script.Main._build_targets(self.fs,
options,
targets,
self.target_top)
if not nodes:
return
# Call each of the Node's alter_targets() methods, which may
# provide additional targets that ended up as part of the build
# (the canonical example being a VariantDir() when we're building
# from a source directory) and which we therefore need their
# state cleared, too.
x = []
for n in nodes:
x.extend(n.alter_targets()[0])
nodes.extend(x)
# Clean up so that we can perform the next build correctly.
#
# We do this by walking over all the children of the targets,
# and clearing their state.
#
# We currently have to re-scan each node to find their
# children, because built nodes have already been partially
# cleared and don't remember their children. (In scons
# 0.96.1 and earlier, this wasn't the case, and we didn't
# have to re-scan the nodes.)
#
# Because we have to re-scan each node, we can't clear the
# nodes as we walk over them, because we may end up rescanning
# a cleared node as we scan a later node. Therefore, only
# store the list of nodes that need to be cleared as we walk
# the tree, and clear them in a separate pass.
#
# XXX: Someone more familiar with the inner workings of scons
# may be able to point out a more efficient way to do this.
SCons.Script.Main.progress_display("scons: Clearing cached node information ...")
seen_nodes = {}
def get_unseen_children(node, parent, seen_nodes=seen_nodes):
def is_unseen(node, seen_nodes=seen_nodes):
return node not in seen_nodes
return [child for child in node.children(scan=1) if is_unseen(child)]
def add_to_seen_nodes(node, parent, seen_nodes=seen_nodes):
seen_nodes[node] = 1
# If this file is in a VariantDir and has a
# corresponding source file in the source tree, remember the
# node in the source tree, too. This is needed in
# particular to clear cached implicit dependencies on the
# source file, since the scanner will scan it if the
# VariantDir was created with duplicate=0.
try:
rfile_method = node.rfile
except AttributeError:
return
else:
rfile = rfile_method()
if rfile != node:
seen_nodes[rfile] = 1
for node in nodes:
walker = SCons.Node.Walker(node,
kids_func=get_unseen_children,
eval_func=add_to_seen_nodes)
n = walker.get_next()
while n:
n = walker.get_next()
for node in seen_nodes.keys():
# Call node.clear() to clear most of the state
node.clear()
# node.clear() doesn't reset node.state, so call
# node.set_state() to reset it manually
node.set_state(SCons.Node.no_state)
node.implicit = None
# Debug: Uncomment to verify that all Taskmaster reference
# counts have been reset to zero.
#if node.ref_count != 0:
# from SCons.Debug import Trace
# Trace('node %s, ref_count %s !!!\n' % (node, node.ref_count))
SCons.SConsign.Reset()
SCons.Script.Main.progress_display("scons: done clearing node information.")
[docs] def do_clean(self, argv):
"""\
clean [TARGETS] Clean (remove) the specified TARGETS
and their dependencies. 'c' is a synonym.
"""
return self.do_build(['build', '--clean'] + argv[1:])
[docs] def do_EOF(self, argv):
print()
self.do_exit(argv)
[docs] def _do_one_help(self, arg):
try:
# If help_<arg>() exists, then call it.
func = getattr(self, 'help_' + arg)
except AttributeError:
try:
func = getattr(self, 'do_' + arg)
except AttributeError:
doc = None
else:
doc = self._doc_to_help(func)
if doc:
sys.stdout.write(doc + '\n')
sys.stdout.flush()
else:
doc = self.strip_initial_spaces(func())
if doc:
sys.stdout.write(doc + '\n')
sys.stdout.flush()
[docs] def _doc_to_help(self, obj):
doc = obj.__doc__
if doc is None:
return ''
return self._strip_initial_spaces(doc)
[docs] def _strip_initial_spaces(self, s):
lines = s.split('\n')
spaces = re.match(' *', lines[0]).group(0)
def strip_spaces(l, spaces=spaces):
if l[:len(spaces)] == spaces:
l = l[len(spaces):]
return l
lines = list(map(strip_spaces, lines))
return '\n'.join(lines)
[docs] def do_exit(self, argv):
"""\
exit Exit SCons interactive mode.
"""
sys.exit(0)
[docs] def do_help(self, argv):
"""\
help [COMMAND] Prints help for the specified COMMAND. 'h'
and '?' are synonyms.
"""
if argv[1:]:
for arg in argv[1:]:
if self._do_one_help(arg):
break
else:
# If bare 'help' is called, print this class's doc
# string (if it has one).
doc = self._doc_to_help(self.__class__)
if doc:
sys.stdout.write(doc + '\n')
sys.stdout.flush()
[docs] def do_shell(self, argv):
"""\
shell [COMMANDLINE] Execute COMMANDLINE in a subshell. 'sh' and
'!' are synonyms.
"""
import subprocess
argv = argv[1:]
if not argv:
argv = os.environ[self.shell_variable]
try:
# Per "[Python-Dev] subprocess insufficiently platform-independent?"
# http://mail.python.org/pipermail/python-dev/2008-August/081979.html "+
# Doing the right thing with an argument list currently
# requires different shell= values on Windows and Linux.
p = subprocess.Popen(argv, shell=(sys.platform=='win32'))
except EnvironmentError as e:
sys.stderr.write('scons: %s: %s\n' % (argv[0], e.strerror))
else:
p.wait()
[docs] def do_version(self, argv):
"""\
version Prints SCons version information.
"""
sys.stdout.write(self.parser.version + '\n')
[docs]def interact(fs, parser, options, targets, target_top):
c = SConsInteractiveCmd(prompt = 'scons>>> ',
fs = fs,
parser = parser,
options = options,
targets = targets,
target_top = target_top)
c.cmdloop()
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