New upstream version 3.0.0upstream/3.0.0

1 files changed, 289 insertions, 266 deletions

diff --git a/engine/SCons/Tool/xgettext.py b/engine/SCons/Tool/xgettext.py
index b05df26..2e2934b 100644
--- a/engine/SCons/Tool/xgettext.py
+++ b/engine/SCons/Tool/xgettext.py
@@ -1,10 +1,10 @@
-""" xgettext tool 
+""" xgettext tool
 
 Tool specific initialization of `xgettext` tool.
 """
 
-# Copyright (c) 2001 - 2016 The SCons Foundation
-# 
+# Copyright (c) 2001 - 2017 The SCons Foundation
+#
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
 # "Software"), to deal in the Software without restriction, including
@@ -12,10 +12,10 @@ Tool specific initialization of `xgettext` tool.
 # distribute, sublicense, and/or sell copies of the Software, and to
 # permit persons to whom the Software is furnished to do so, subject to
 # the following conditions:
-# 
+#
 # The above copyright notice and this permission notice shall be included
 # in all copies or substantial portions of the Software.
-# 
+#
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
@@ -24,312 +24,335 @@ Tool specific initialization of `xgettext` tool.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/xgettext.py rel_2.5.1:3735:9dc6cee5c168 2016/11/03 14:02:02 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/xgettext.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+
 
 #############################################################################
 class _CmdRunner(object):
-  """ Callabe object, which runs shell command storing its stdout and stderr to
-  variables. It also provides `strfunction()` method, which shall be used by
-  scons Action objects to print command string. """
-
-  def __init__( self, command, commandstr = None):
-    self.out = None
-    self.err = None
-    self.status = None
-    self.command = command
-    self.commandstr = commandstr
-
-  def __call__(self, target, source, env): 
-    import SCons.Action
-    import subprocess
-    import os
-    import sys
-    kw = { 
-      'stdin'  : 'devnull',
-      'stdout' : subprocess.PIPE,
-      'stderr' : subprocess.PIPE,
-      'universal_newlines' : True,
-      'shell'  : True
-    }
-    command = env.subst(self.command, target = target, source = source)
-    proc = SCons.Action._subproc(env, command, **kw)
-    self.out, self.err = proc.communicate()
-    self.status = proc.wait()
-    if self.err: sys.stderr.write(unicode(self.err))
-    return self.status
-
-  def strfunction(self, target, source, env):
-    import os
-    comstr = self.commandstr
-    if env.subst(comstr, target = target, source = source) == "":
-      comstr = self.command
-    s = env.subst(comstr, target = target, source = source)
-    return s
+    """ Callable object, which runs shell command storing its stdout and stderr to
+    variables. It also provides `strfunction()` method, which shall be used by
+    scons Action objects to print command string. """
+
+    def __init__(self, command, commandstr=None):
+        self.out = None
+        self.err = None
+        self.status = None
+        self.command = command
+        self.commandstr = commandstr
+
+    def __call__(self, target, source, env):
+        import SCons.Action
+        import subprocess
+        import os
+        import sys
+        kw = {
+            'stdin': 'devnull',
+            'stdout': subprocess.PIPE,
+            'stderr': subprocess.PIPE,
+            'universal_newlines': True,
+            'shell': True
+        }
+        command = env.subst(self.command, target=target, source=source)
+        proc = SCons.Action._subproc(env, command, **kw)
+        self.out, self.err = proc.communicate()
+        self.status = proc.wait()
+        if self.err:
+            sys.stderr.write(unicode(self.err))
+        return self.status
+
+    def strfunction(self, target, source, env):
+        import os
+        comstr = self.commandstr
+        if env.subst(comstr, target=target, source=source) == "":
+            comstr = self.command
+        s = env.subst(comstr, target=target, source=source)
+        return s
+
+
 #############################################################################
 
 #############################################################################
 def _update_pot_file(target, source, env):
-  """ Action function for `POTUpdate` builder """
-  import re
-  import os
-  import SCons.Action
-  nop = lambda target, source, env : 0
-
-  # Save scons cwd and os cwd (NOTE: they may be different. After the job, we
-  # revert each one to its original state).
-  save_cwd = env.fs.getcwd()
-  save_os_cwd = os.getcwd()
-  chdir = target[0].dir
-  chdir_str = repr(chdir.get_abspath())
-  # Print chdir message (employ SCons.Action.Action for that. It knows better
-  # than me how to to this correctly).
-  env.Execute(SCons.Action.Action(nop, "Entering " + chdir_str))
-  # Go to target's directory and do our job
-  env.fs.chdir(chdir, 1) # Go into target's directory
-  try:
-    cmd = _CmdRunner('$XGETTEXTCOM', '$XGETTEXTCOMSTR')
-    action = SCons.Action.Action(cmd, strfunction=cmd.strfunction)
-    status = action([ target[0] ], source, env)
-  except:
-    # Something went wrong.
+    """ Action function for `POTUpdate` builder """
+    import re
+    import os
+    import SCons.Action
+    nop = lambda target, source, env: 0
+
+    # Save scons cwd and os cwd (NOTE: they may be different. After the job, we
+    # revert each one to its original state).
+    save_cwd = env.fs.getcwd()
+    save_os_cwd = os.getcwd()
+    chdir = target[0].dir
+    chdir_str = repr(chdir.get_abspath())
+    # Print chdir message (employ SCons.Action.Action for that. It knows better
+    # than me how to to this correctly).
+    env.Execute(SCons.Action.Action(nop, "Entering " + chdir_str))
+    # Go to target's directory and do our job
+    env.fs.chdir(chdir, 1)  # Go into target's directory
+    try:
+        cmd = _CmdRunner('$XGETTEXTCOM', '$XGETTEXTCOMSTR')
+        action = SCons.Action.Action(cmd, strfunction=cmd.strfunction)
+        status = action([target[0]], source, env)
+    except:
+        # Something went wrong.
+        env.Execute(SCons.Action.Action(nop, "Leaving " + chdir_str))
+        # Revert working dirs to previous state and re-throw exception.
+        env.fs.chdir(save_cwd, 0)
+        os.chdir(save_os_cwd)
+        raise
+    # Print chdir message.
     env.Execute(SCons.Action.Action(nop, "Leaving " + chdir_str))
-    # Revert working dirs to previous state and re-throw exception.
+    # Revert working dirs to previous state.
     env.fs.chdir(save_cwd, 0)
     os.chdir(save_os_cwd)
-    raise
-  # Print chdir message.
-  env.Execute(SCons.Action.Action(nop, "Leaving " + chdir_str))
-  # Revert working dirs to previous state.
-  env.fs.chdir(save_cwd, 0)
-  os.chdir(save_os_cwd)
-  # If the command was not successfull, return error code.
-  if status: return status
- 
-  new_content = cmd.out
- 
-  if not new_content:
-    # When xgettext finds no internationalized messages, no *.pot is created
-    # (because we don't want to bother translators with empty POT files).
-    needs_update = False
-    explain = "no internationalized messages encountered"
-  else:
-    if target[0].exists():
-      # If the file already exists, it's left unaltered unless its messages
-      # are outdated (w.r.t. to these recovered by xgettext from sources).
-      old_content = target[0].get_text_contents()
-      re_cdate = re.compile(r'^"POT-Creation-Date: .*"$[\r\n]?', re.M)
-      old_content_nocdate = re.sub(re_cdate,"",old_content)
-      new_content_nocdate = re.sub(re_cdate,"",new_content)
-      if(old_content_nocdate == new_content_nocdate):
-        # Messages are up-to-date
+    # If the command was not successfull, return error code.
+    if status: return status
+
+    new_content = cmd.out
+
+    if not new_content:
+        # When xgettext finds no internationalized messages, no *.pot is created
+        # (because we don't want to bother translators with empty POT files).
         needs_update = False
-        explain = "messages in file found to be up-to-date"
-      else:
-        # Messages are outdated
-        needs_update = True
-        explain = "messages in file were outdated"
+        explain = "no internationalized messages encountered"
     else:
-      # No POT file found, create new one
-      needs_update = True
-      explain = "new file"
-  if needs_update:
-    # Print message employing SCons.Action.Action for that.
-    msg = "Writing " + repr(str(target[0])) + " (" + explain + ")"
-    env.Execute(SCons.Action.Action(nop, msg))
-    f = open(str(target[0]),"w")
-    f.write(new_content)
-    f.close()
-    return 0
-  else:
-    # Print message employing SCons.Action.Action for that.
-    msg = "Not writing " + repr(str(target[0])) + " (" + explain + ")"
-    env.Execute(SCons.Action.Action(nop, msg))
-    return 0 
+        if target[0].exists():
+            # If the file already exists, it's left unaltered unless its messages
+            # are outdated (w.r.t. to these recovered by xgettext from sources).
+            old_content = target[0].get_text_contents()
+            re_cdate = re.compile(r'^"POT-Creation-Date: .*"$[\r\n]?', re.M)
+            old_content_nocdate = re.sub(re_cdate, "", old_content)
+            new_content_nocdate = re.sub(re_cdate, "", new_content)
+            if (old_content_nocdate == new_content_nocdate):
+                # Messages are up-to-date
+                needs_update = False
+                explain = "messages in file found to be up-to-date"
+            else:
+                # Messages are outdated
+                needs_update = True
+                explain = "messages in file were outdated"
+        else:
+            # No POT file found, create new one
+            needs_update = True
+            explain = "new file"
+    if needs_update:
+        # Print message employing SCons.Action.Action for that.
+        msg = "Writing " + repr(str(target[0])) + " (" + explain + ")"
+        env.Execute(SCons.Action.Action(nop, msg))
+        f = open(str(target[0]), "w")
+        f.write(new_content)
+        f.close()
+        return 0
+    else:
+        # Print message employing SCons.Action.Action for that.
+        msg = "Not writing " + repr(str(target[0])) + " (" + explain + ")"
+        env.Execute(SCons.Action.Action(nop, msg))
+        return 0
+
+
 #############################################################################
 
 #############################################################################
 from SCons.Builder import BuilderBase
+
+
 #############################################################################
 class _POTBuilder(BuilderBase):
-  def _execute(self, env, target, source, *args):
-    if not target:
-      if env.has_key('POTDOMAIN') and env['POTDOMAIN']:
-        domain = env['POTDOMAIN']
-      else:
-        domain = 'messages'
-      target = [ domain ]
-    return BuilderBase._execute(self, env, target, source, *args)
+    def _execute(self, env, target, source, *args):
+        if not target:
+            if 'POTDOMAIN' in env and env['POTDOMAIN']:
+                domain = env['POTDOMAIN']
+            else:
+                domain = 'messages'
+            target = [domain]
+        return BuilderBase._execute(self, env, target, source, *args)
+
+
 #############################################################################
 
 #############################################################################
-def _scan_xgettext_from_files(target, source, env, files = None, path = None):
-  """ Parses `POTFILES.in`-like file and returns list of extracted file names.
-  """
-  import re
-  import SCons.Util
-  import SCons.Node.FS
-
-  if files is None:
+def _scan_xgettext_from_files(target, source, env, files=None, path=None):
+    """ Parses `POTFILES.in`-like file and returns list of extracted file names.
+    """
+    import re
+    import SCons.Util
+    import SCons.Node.FS
+
+    if files is None:
+        return 0
+    if not SCons.Util.is_List(files):
+        files = [files]
+
+    if path is None:
+        if 'XGETTEXTPATH' in env:
+            path = env['XGETTEXTPATH']
+        else:
+            path = []
+    if not SCons.Util.is_List(path):
+        path = [path]
+
+    path = SCons.Util.flatten(path)
+
+    dirs = ()
+    for p in path:
+        if not isinstance(p, SCons.Node.FS.Base):
+            if SCons.Util.is_String(p):
+                p = env.subst(p, source=source, target=target)
+            p = env.arg2nodes(p, env.fs.Dir)
+        dirs += tuple(p)
+    # cwd is the default search path (when no path is defined by user)
+    if not dirs:
+        dirs = (env.fs.getcwd(),)
+
+    # Parse 'POTFILE.in' files.
+    re_comment = re.compile(r'^#[^\n\r]*$\r?\n?', re.M)
+    re_emptyln = re.compile(r'^[ \t\r]*$\r?\n?', re.M)
+    re_trailws = re.compile(r'[ \t\r]+$')
+    for f in files:
+        # Find files in search path $XGETTEXTPATH
+        if isinstance(f, SCons.Node.FS.Base) and f.rexists():
+            contents = f.get_text_contents()
+            contents = re_comment.sub("", contents)
+            contents = re_emptyln.sub("", contents)
+            contents = re_trailws.sub("", contents)
+            depnames = contents.splitlines()
+            for depname in depnames:
+                depfile = SCons.Node.FS.find_file(depname, dirs)
+                if not depfile:
+                    depfile = env.arg2nodes(depname, dirs[0].File)
+                env.Depends(target, depfile)
     return 0
-  if not SCons.Util.is_List(files):
-    files = [ files ]
 
-  if path is None:
-    if env.has_key('XGETTEXTPATH'):
-      path = env['XGETTEXTPATH']
-    else:
-      path = []
-  if not SCons.Util.is_List(path):
-    path = [ path ]
-
-  path = SCons.Util.flatten(path)
-
-  dirs = ()
-  for p in path:
-    if not isinstance(p, SCons.Node.FS.Base):
-      if SCons.Util.is_String(p):
-        p = env.subst(p, source = source, target = target)
-      p = env.arg2nodes(p, env.fs.Dir)
-    dirs += tuple(p)
-  # cwd is the default search path (when no path is defined by user)
-  if not dirs:
-    dirs = (env.fs.getcwd(),)
-
-  # Parse 'POTFILE.in' files.
-  re_comment = re.compile(r'^#[^\n\r]*$\r?\n?', re.M)
-  re_emptyln = re.compile(r'^[ \t\r]*$\r?\n?', re.M)
-  re_trailws = re.compile(r'[ \t\r]+$')
-  for f in files:
-    # Find files in search path $XGETTEXTPATH
-    if isinstance(f, SCons.Node.FS.Base) and f.rexists():
-      contents = f.get_text_contents()
-      contents = re_comment.sub("", contents)
-      contents = re_emptyln.sub("", contents)
-      contents = re_trailws.sub("", contents)
-      depnames = contents.splitlines()
-      for depname in depnames: 
-        depfile = SCons.Node.FS.find_file(depname, dirs)
-        if not depfile:
-          depfile = env.arg2nodes(depname, dirs[0].File)
-        env.Depends(target, depfile)
-  return 0
+
 #############################################################################
 
 #############################################################################
 def _pot_update_emitter(target, source, env):
-  """ Emitter function for `POTUpdate` builder """
-  from SCons.Tool.GettextCommon import _POTargetFactory
-  import SCons.Util
-  import SCons.Node.FS
-
-  if env.has_key('XGETTEXTFROM'): 
-    xfrom = env['XGETTEXTFROM']
-  else:
+    """ Emitter function for `POTUpdate` builder """
+    from SCons.Tool.GettextCommon import _POTargetFactory
+    import SCons.Util
+    import SCons.Node.FS
+
+    if 'XGETTEXTFROM' in env:
+        xfrom = env['XGETTEXTFROM']
+    else:
+        return target, source
+    if not SCons.Util.is_List(xfrom):
+        xfrom = [xfrom]
+
+    xfrom = SCons.Util.flatten(xfrom)
+
+    # Prepare list of 'POTFILE.in' files.
+    files = []
+    for xf in xfrom:
+        if not isinstance(xf, SCons.Node.FS.Base):
+            if SCons.Util.is_String(xf):
+                # Interpolate variables in strings
+                xf = env.subst(xf, source=source, target=target)
+            xf = env.arg2nodes(xf)
+        files.extend(xf)
+    if files:
+        env.Depends(target, files)
+        _scan_xgettext_from_files(target, source, env, files)
     return target, source
-  if not SCons.Util.is_List(xfrom):
-    xfrom = [ xfrom ]
-
-  xfrom = SCons.Util.flatten(xfrom)
-  
-  # Prepare list of 'POTFILE.in' files.
-  files = []
-  for xf in xfrom:
-    if not isinstance(xf, SCons.Node.FS.Base):
-      if SCons.Util.is_String(xf):
-        # Interpolate variables in strings 
-        xf = env.subst(xf, source = source, target = target)
-      xf = env.arg2nodes(xf)
-    files.extend(xf)
-  if files:
-    env.Depends(target, files)
-    _scan_xgettext_from_files(target, source, env, files)
-  return target, source
+
+
 #############################################################################
 
 #############################################################################
 from SCons.Environment import _null
+
+
 #############################################################################
 def _POTUpdateBuilderWrapper(env, target=None, source=_null, **kw):
-  return env._POTUpdateBuilder(target, source, **kw)
+    return env._POTUpdateBuilder(target, source, **kw)
+
+
 #############################################################################
 
 #############################################################################
 def _POTUpdateBuilder(env, **kw):
-  """ Creates `POTUpdate` builder object """
-  import SCons.Action
-  from SCons.Tool.GettextCommon import _POTargetFactory
-  kw['action'] = SCons.Action.Action(_update_pot_file, None)
-  kw['suffix'] = '$POTSUFFIX'
-  kw['target_factory'] = _POTargetFactory(env, alias='$POTUPDATE_ALIAS').File
-  kw['emitter'] = _pot_update_emitter
-  return _POTBuilder(**kw)
+    """ Creates `POTUpdate` builder object """
+    import SCons.Action
+    from SCons.Tool.GettextCommon import _POTargetFactory
+    kw['action'] = SCons.Action.Action(_update_pot_file, None)
+    kw['suffix'] = '$POTSUFFIX'
+    kw['target_factory'] = _POTargetFactory(env, alias='$POTUPDATE_ALIAS').File
+    kw['emitter'] = _pot_update_emitter
+    return _POTBuilder(**kw)
+
+
 #############################################################################
 
 #############################################################################
-def generate(env,**kw):
-  """ Generate `xgettext` tool """
-  import SCons.Util
-  from SCons.Tool.GettextCommon import RPaths, _detect_xgettext
-
-  try:
-    env['XGETTEXT'] = _detect_xgettext(env)
-  except:
-    env['XGETTEXT'] = 'xgettext' 
-  # NOTE: sources="$SOURCES" would work as well. However, we use following
-  # construction to convert absolute paths provided by scons onto paths
-  # relative to current working dir. Note, that scons expands $SOURCE(S) to
-  # absolute paths for sources $SOURCE(s) outside of current subtree (e.g. in
-  # "../"). With source=$SOURCE these absolute paths would be written to the
-  # resultant *.pot file (and its derived *.po files) as references to lines in
-  # source code (e.g. referring lines in *.c files). Such references would be
-  # correct (e.g. in poedit) only on machine on which *.pot was generated and
-  # would be of no use on other hosts (having a copy of source code located
-  # in different place in filesystem).
-  sources = '$( ${_concat( "", SOURCES, "", __env__, XgettextRPaths, TARGET' \
-    + ', SOURCES)} $)'
-
-  # NOTE: the output from $XGETTEXTCOM command must go to stdout, not to a file.
-  # This is required by the POTUpdate builder's action.
-  xgettextcom = '$XGETTEXT $XGETTEXTFLAGS $_XGETTEXTPATHFLAGS' \
-    + ' $_XGETTEXTFROMFLAGS -o - ' + sources
-
-  xgettextpathflags = '$( ${_concat( XGETTEXTPATHPREFIX, XGETTEXTPATH' \
-    + ', XGETTEXTPATHSUFFIX, __env__, RDirs, TARGET, SOURCES)} $)'
-  xgettextfromflags = '$( ${_concat( XGETTEXTFROMPREFIX, XGETTEXTFROM' \
-    + ', XGETTEXTFROMSUFFIX, __env__, target=TARGET, source=SOURCES)} $)'
-
-  env.SetDefault(
-    _XGETTEXTDOMAIN     = '${TARGET.filebase}',
-    XGETTEXTFLAGS       = [ ],
-    XGETTEXTCOM         = xgettextcom,
-    XGETTEXTCOMSTR      = '',
-    XGETTEXTPATH        = [ ],
-    XGETTEXTPATHPREFIX   = '-D',
-    XGETTEXTPATHSUFFIX   = '',
-    XGETTEXTFROM        = None,
-    XGETTEXTFROMPREFIX   = '-f',
-    XGETTEXTFROMSUFFIX   = '',
-   _XGETTEXTPATHFLAGS    = xgettextpathflags,
-   _XGETTEXTFROMFLAGS   = xgettextfromflags,
-    POTSUFFIX           =  ['.pot'],
-    POTUPDATE_ALIAS     = 'pot-update',
-    XgettextRPaths      = RPaths(env)
-  )
-  env.Append( BUILDERS = {
-    '_POTUpdateBuilder' : _POTUpdateBuilder(env)
-  } )
-  env.AddMethod(_POTUpdateBuilderWrapper, 'POTUpdate')
-  env.AlwaysBuild(env.Alias('$POTUPDATE_ALIAS'))
+def generate(env, **kw):
+    """ Generate `xgettext` tool """
+    import SCons.Util
+    from SCons.Tool.GettextCommon import RPaths, _detect_xgettext
+
+    try:
+        env['XGETTEXT'] = _detect_xgettext(env)
+    except:
+        env['XGETTEXT'] = 'xgettext'
+    # NOTE: sources="$SOURCES" would work as well. However, we use following
+    # construction to convert absolute paths provided by scons onto paths
+    # relative to current working dir. Note, that scons expands $SOURCE(S) to
+    # absolute paths for sources $SOURCE(s) outside of current subtree (e.g. in
+    # "../"). With source=$SOURCE these absolute paths would be written to the
+    # resultant *.pot file (and its derived *.po files) as references to lines in
+    # source code (e.g. referring lines in *.c files). Such references would be
+    # correct (e.g. in poedit) only on machine on which *.pot was generated and
+    # would be of no use on other hosts (having a copy of source code located
+    # in different place in filesystem).
+    sources = '$( ${_concat( "", SOURCES, "", __env__, XgettextRPaths, TARGET' \
+              + ', SOURCES)} $)'
+
+    # NOTE: the output from $XGETTEXTCOM command must go to stdout, not to a file.
+    # This is required by the POTUpdate builder's action.
+    xgettextcom = '$XGETTEXT $XGETTEXTFLAGS $_XGETTEXTPATHFLAGS' \
+                  + ' $_XGETTEXTFROMFLAGS -o - ' + sources
+
+    xgettextpathflags = '$( ${_concat( XGETTEXTPATHPREFIX, XGETTEXTPATH' \
+                        + ', XGETTEXTPATHSUFFIX, __env__, RDirs, TARGET, SOURCES)} $)'
+    xgettextfromflags = '$( ${_concat( XGETTEXTFROMPREFIX, XGETTEXTFROM' \
+                        + ', XGETTEXTFROMSUFFIX, __env__, target=TARGET, source=SOURCES)} $)'
+
+    env.SetDefault(
+        _XGETTEXTDOMAIN='${TARGET.filebase}',
+        XGETTEXTFLAGS=[],
+        XGETTEXTCOM=xgettextcom,
+        XGETTEXTCOMSTR='',
+        XGETTEXTPATH=[],
+        XGETTEXTPATHPREFIX='-D',
+        XGETTEXTPATHSUFFIX='',
+        XGETTEXTFROM=None,
+        XGETTEXTFROMPREFIX='-f',
+        XGETTEXTFROMSUFFIX='',
+        _XGETTEXTPATHFLAGS=xgettextpathflags,
+        _XGETTEXTFROMFLAGS=xgettextfromflags,
+        POTSUFFIX=['.pot'],
+        POTUPDATE_ALIAS='pot-update',
+        XgettextRPaths=RPaths(env)
+    )
+    env.Append(BUILDERS={
+        '_POTUpdateBuilder': _POTUpdateBuilder(env)
+    })
+    env.AddMethod(_POTUpdateBuilderWrapper, 'POTUpdate')
+    env.AlwaysBuild(env.Alias('$POTUPDATE_ALIAS'))
+
+
 #############################################################################
 
 #############################################################################
 def exists(env):
-  """ Check, whether the tool exists """
-  from SCons.Tool.GettextCommon import _xgettext_exists
-  try:
-    return _xgettext_exists(env)
-  except:
-    return False
+    """ Check, whether the tool exists """
+    from SCons.Tool.GettextCommon import _xgettext_exists
+    try:
+        return _xgettext_exists(env)
+    except:
+        return False
+
 #############################################################################
 
 # Local Variables: