diff --git a/add_svg_glyphs.py b/add_svg_glyphs.py
index 191b5ffa..63370028 100755
--- a/add_svg_glyphs.py
+++ b/add_svg_glyphs.py
@@ -19,28 +19,25 @@
 
 import argparse
 import glob
+import logging
 import os
 import re
 import sys
 
-# find the noto root, so we can get nototools
-# alternatively we could just define PYTHONPATH or always run this from
-# noto root, but for testing we might not always be doing that.
-_noto_root = os.path.abspath(os.path.join(os.path.dirname(__file__), '../..'))
-sys.path.append(_noto_root)
-
 from fontTools.ttLib.tables import otTables
 from fontTools.ttLib.tables import _g_l_y_f
 from fontTools.ttLib.tables import S_V_G_ as SVG
 from fontTools import ttx
 
+from nototools import tool_utils
+
 import add_emoji_gsub
 import svg_builder
-import svg_cleaner
+
 
 class FontBuilder(object):
-  """A utility for mutating a ttx font.  This maintains glyph_order, cmap, and hmtx tables,
-  and optionally GSUB, glyf, and SVN tables as well."""
+  """A utility for mutating a ttx font.  This maintains glyph_order, cmap, and
+  hmtx tables, and optionally GSUB, glyf, and SVN tables as well."""
 
   def __init__(self, font):
     self.font = font;
@@ -49,8 +46,8 @@ class FontBuilder(object):
     self.hmtx = font['hmtx'].metrics
 
   def init_gsub(self):
-    """Call this if you are going to add ligatures to the font.  Creates a GSUB table
-    if there isn't one already."""
+    """Call this if you are going to add ligatures to the font.  Creates a GSUB
+    table if there isn't one already."""
 
     if hasattr(self, 'ligatures'):
       return
@@ -73,8 +70,8 @@ class FontBuilder(object):
     self.ligatures = lookup.SubTable[0].ligatures
 
   def init_glyf(self):
-    """Call this if you need to create empty glyf entries in the font when you add a new
-    glyph."""
+    """Call this if you need to create empty glyf entries in the font when you
+    add a new glyph."""
 
     if hasattr(self, 'glyphs'):
       return
@@ -87,8 +84,9 @@ class FontBuilder(object):
     self.glyphs = font['glyf'].glyphs
 
   def init_svg(self):
-    """Call this if you expect to add SVG images in the font. This calls init_glyf since SVG
-    support currently requires fallback glyf records for each SVG image."""
+    """Call this if you expect to add SVG images in the font. This calls
+    init_glyf since SVG support currently requires fallback glyf records for
+    each SVG image."""
 
     if hasattr(self, 'svgs'):
       return
@@ -131,7 +129,8 @@ class FontBuilder(object):
       self.ligatures[first] = [lig]
 
   def _add_empty_glyph(self, glyphstr, name):
-    """Create an empty glyph. If glyphstr is not a ligature, add a cmap entry for it."""
+    """Create an empty glyph. If glyphstr is not a ligature, add a cmap entry
+    for it."""
     if len(glyphstr) == 1:
       self.cmap[ord(glyphstr)] = name
     self.hmtx[name] = [0, 0]
@@ -140,11 +139,12 @@ class FontBuilder(object):
       self.glyphs[name] = _g_l_y_f.Glyph()
 
   def add_components_and_ligature(self, glyphstr):
-    """Convert glyphstr to a name and check if it already exists. If not, check if it is a
-    ligature (longer than one codepoint), and if it is, generate empty glyphs with cmap
-    entries for any missing ligature components and add a ligature record.  Then generate
-    an empty glyph for the name.  Return a tuple with the name, index, and a bool
-    indicating whether the glyph already existed."""
+    """Convert glyphstr to a name and check if it already exists. If not, check
+    if it is a ligature (longer than one codepoint), and if it is, generate
+    empty glyphs with cmap entries for any missing ligature components and add a
+    ligature record.  Then generate an empty glyph for the name.  Return a tuple
+    with the name, index, and a bool indicating whether the glyph already
+    existed."""
 
     name = self.glyph_name(glyphstr)
     index = self.glyph_name_to_index(name)
@@ -161,8 +161,8 @@ class FontBuilder(object):
     return name, index, exists
 
   def add_svg(self, doc, hmetrics, name, index):
-    """Add an svg table entry. If hmetrics is not None, update the hmtx table. This
-    expects the glyph has already been added."""
+    """Add an svg table entry. If hmetrics is not None, update the hmtx table.
+    This expects the glyph has already been added."""
     # sanity check to make sure name and index correspond.
     assert name == self.glyph_index_to_name(index)
     if hmetrics:
@@ -171,27 +171,27 @@ class FontBuilder(object):
     self.svgs.append(svg_record)
 
 
-def collect_glyphstr_file_pairs(prefix, ext, include=None, exclude=None, verbosity=1):
-  """Scan files with the given prefix and extension, and return a list of (glyphstr,
-  filename) where glyphstr is the character or ligature, and filename is the image file
-  associated with it.  The glyphstr is formed by decoding the filename (exclusive of the
-  prefix) as a sequence of hex codepoints separated by underscore. Include, if defined, is
-  a regex string to include only matched filenames. Exclude, if defined, is a regex string
-  to exclude matched filenames, and is applied after include."""
+def collect_glyphstr_file_pairs(prefix, ext, include=None, exclude=None):
+  """Scan files with the given prefix and extension, and return a list of
+  (glyphstr, filename) where glyphstr is the character or ligature, and filename
+  is the image file associated with it.  The glyphstr is formed by decoding the
+  filename (exclusive of the prefix) as a sequence of hex codepoints separated
+  by underscore. Include, if defined, is a regex string to include only matched
+  filenames. Exclude, if defined, is a regex string to exclude matched
+  filenames, and is applied after include."""
 
   image_files = {}
   glob_pat = "%s*.%s" % (prefix, ext)
   leading = len(prefix)
   trailing = len(ext) + 1 # include dot
-  if verbosity:
-    print "Looking for images matching '%s'." % glob_pat
+  logging.info("Looking for images matching '%s'.", glob_pat)
   ex_count = 0
   ex = re.compile(exclude) if exclude else None
   inc = re.compile(include) if include else None
-  if verbosity and inc:
-    print "Including images matching '%s'." % include
-  if verbosity and ex:
-    print "Excluding images matching '%s'." % exclude
+  if inc:
+    logging.info("Including images matching '%s'.", include)
+  if ex:
+    logging.info("Excluding images matching '%s'.", exclude)
 
   for image_file in glob.glob(glob_pat):
     if inc and not inc.search(image_file):
@@ -211,76 +211,83 @@ def collect_glyphstr_file_pairs(prefix, ext, include=None, exclude=None, verbosi
       u = unichr(int(codes, 16))
     image_files[u] = image_file
 
-  if verbosity and ex_count:
-    print "Excluded %d files." % ex_count
+  if ex_count:
+    logging.info("Excluded %d files.", ex_count)
   if not image_files:
-    raise Exception ("No image files matching '%s'." % glob_pat)
-  if verbosity:
-    print "Included %s files." % len(image_files)
+    raise Exception ("No image files matching '%s'.", glob_pat)
+  logging.info("Matched %s files.", len(image_files))
   return image_files.items()
 
 
 def sort_glyphstr_tuples(glyphstr_tuples):
-  """The list contains tuples whose first element is a string representing a character or
-  ligature.  It is sorted with shorter glyphstrs first, then alphabetically. This ensures
-  that ligature components are added to the font before any ligatures that contain them."""
+  """The list contains tuples whose first element is a string representing a
+  character or ligature.  It is sorted with shorter glyphstrs first, then
+  alphabetically. This ensures that ligature components are added to the font
+  before any ligatures that contain them."""
   glyphstr_tuples.sort(key=lambda t: (len(t[0]), t[0]))
 
 
-def add_image_glyphs(in_file, out_file, pairs, verbosity=1):
+def add_image_glyphs(in_file, out_file, pairs):
   """Add images from pairs (glyphstr, filename) to .ttx file in_file and write
   to .ttx file out_file."""
 
-  quiet = verbosity < 2
-  font = ttx.TTFont(quiet=quiet)
-  font.importXML(in_file, quiet=quiet)
+  font = ttx.TTFont()
+  font.importXML(in_file)
 
   sort_glyphstr_tuples(pairs)
 
   font_builder = FontBuilder(font)
-  # we've already sorted by length, so the longest glyphstrs are at the end. To see if
-  # we have ligatures, we just need to check the last one.
+  # we've already sorted by length, so the longest glyphstrs are at the end. To
+  # see if we have ligatures, we just need to check the last one.
   if len(pairs[-1][0]) > 1:
     font_builder.init_gsub()
 
   img_builder = svg_builder.SvgBuilder(font_builder)
   for glyphstr, filename in pairs:
-    if verbosity > 1:
-      print "Adding glyph for U+%s" % ",".join(["%04X" % ord(char) for char in glyphstr])
+    logging.debug("Adding glyph for U+%s", ",".join(
+          ["%04X" % ord(char) for char in glyphstr]))
     img_builder.add_from_filename(glyphstr, filename)
 
-  font.saveXML(out_file, quiet=quiet)
-  if verbosity:
-    print "added %s images to %s" % (len(pairs), out_file)
+  font.saveXML(out_file)
+  logging.info("Added %s images to %s", len(pairs), out_file)
 
 
 def main(argv):
-  usage = """This will search for files that have image_prefix followed by one or more
-      hex numbers (separated by underscore if more than one), and end in ".svg".
-      For example, if image_prefix is "icons/u", then files with names like
-      "icons/u1F4A9.svg" or "icons/u1F1EF_1F1F5.svg" will be loaded.  The script
-      then adds cmap, htmx, and potentially GSUB entries for the Unicode
-      characters found.  The advance width will be chosen based on image aspect
-      ratio.  If Unicode values outside the BMP are desired, the existing cmap
-      table should be of the appropriate (format 12) type.  Only the first cmap
-      table and the first GSUB lookup (if existing) are modified."""
+  usage = """This will search for files that have image_prefix followed by one
+  or more hex numbers (separated by underscore if more than one), and end in
+  ".svg". For example, if image_prefix is "icons/u", then files with names like
+  "icons/u1F4A9.svg" or "icons/u1F1EF_1F1F5.svg" will be loaded.  The script
+  then adds cmap, htmx, and potentially GSUB entries for the Unicode characters
+  found.  The advance width will be chosen based on image aspect ratio.  If
+  Unicode values outside the BMP are desired, the existing cmap table should be
+  of the appropriate (format 12) type.  Only the first cmap table and the first
+  GSUB lookup (if existing) are modified."""
 
   parser = argparse.ArgumentParser(
-      description="Update cmap, glyf, GSUB, and hmtx tables from image glyphs.", epilog=usage)
-  parser.add_argument('in_file', help="Input ttx file name.")
-  parser.add_argument('out_file', help="Output ttx file name.")
-  parser.add_argument('image_prefix', help="Location and prefix of image files.")
-  parser.add_argument('-i', '--include', help='include files whoses name matches this regex')
-  parser.add_argument('-e', '--exclude', help='exclude files whose name matches this regex')
-  parser.add_argument('--quiet', '-q', dest='v', help="quiet operation.", default=1,
-                      action='store_const', const=0)
-  parser.add_argument('--verbose', '-v', dest='v', help="verbose operation.",
-                      action='store_const', const=2)
+      description='Update cmap, glyf, GSUB, and hmtx tables from image glyphs.',
+      epilog=usage)
+  parser.add_argument(
+      'in_file', help='Input ttx file name.', metavar='fname')
+  parser.add_argument(
+      'out_file', help='Output ttx file name.', metavar='fname')
+  parser.add_argument(
+      'image_prefix', help='Location and prefix of image files.',
+      metavar='path')
+  parser.add_argument(
+      '-i', '--include', help='include files whoses name matches this regex',
+      metavar='regex')
+  parser.add_argument(
+      '-e', '--exclude', help='exclude files whose name matches this regex',
+      metavar='regex')
+  parser.add_argument(
+      '-l', '--loglevel', help='log level name', default='warning')
   args = parser.parse_args(argv)
 
-  pairs = collect_glyphstr_file_pairs(args.image_prefix, 'svg', include=args.include,
-                                      exclude=args.exclude, verbosity=args.v)
-  add_image_glyphs(args.in_file, args.out_file, pairs, verbosity=args.v)
+  tool_utils.setup_logging(args.loglevel)
+
+  pairs = collect_glyphstr_file_pairs(
+      args.image_prefix, 'svg', include=args.include, exclude=args.exclude)
+  add_image_glyphs(args.in_file, args.out_file, pairs)
 
 
 if __name__ == '__main__':
diff --git a/collect_emoji_svg.py b/collect_emoji_svg.py
index bb0f744a..b7d8521c 100755
--- a/collect_emoji_svg.py
+++ b/collect_emoji_svg.py
@@ -33,12 +33,15 @@ the files without messing with the originals."""
 
 import argparse
 import glob
+import logging
 import os
 import os.path
 import re
 import shutil
 import sys
 
+from nototools import tool_utils
+
 def _is_svg(f):
   return f.endswith('.svg')
 
@@ -48,23 +51,27 @@ def _is_svg_and_startswith_emoji(f):
 
 
 def _flag_rename(f):
-  """Converts file names from region-flags files (upper-case ASCII) to our expected
-  'encoded-codepoint-ligature' form, mapping each character to the corresponding
+  """Converts a file name from two-letter upper-case ASCII to our expected
+  'emoji_uXXXXX_XXXXX form, mapping each character to the corresponding
   regional indicator symbol."""
 
   cp_strs = []
   name, ext = os.path.splitext(f)
+  if len(name) != 2:
+    raise ValueError('illegal flag name "%s"' % f)
   for cp in name:
+    if not ('A' <= cp <= 'Z'):
+      raise ValueError('illegal flag name "%s"' % f)
     ncp = 0x1f1e6 - 0x41 + ord(cp)
     cp_strs.append("%04x" % ncp)
   return 'emoji_u%s%s' % ('_'.join(cp_strs), ext)
 
 
-def copy_with_rename(src_dir, dst_dir, accept_pred=None, rename=None, verbosity=1):
-  """Copy files from src_dir to dst_dir that match accept_pred (all if None) and rename
-  using rename (if not None), replacing existing files.  accept_pred takes the filename
-  and returns True if the file should be copied, rename takes the filename and returns a
-  new file name."""
+def copy_with_rename(src_dir, dst_dir, accept_pred=None, rename=None):
+  """Copy files from src_dir to dst_dir that match accept_pred (all if None) and
+  rename using rename (if not None), replacing existing files.  accept_pred
+  takes the filename and returns True if the file should be copied, rename takes
+  the filename and returns a new file name."""
 
   count = 0
   replace_count = 0
@@ -75,66 +82,69 @@ def copy_with_rename(src_dir, dst_dir, accept_pred=None, rename=None, verbosity=
     src = os.path.join(src_dir, src_filename)
     dst = os.path.join(dst_dir, dst_filename)
     if os.path.exists(dst):
-      if verbosity > 1:
-        print "Replacing existing file " + dst
+      logging.debug('Replacing existing file %s', dst)
       os.unlink(dst)
       replace_count += 1
     shutil.copy2(src, dst)
-    if verbosity > 1:
-      print "cp -p %s %s" % (src, dst)
+    logging.debug('cp -p %s %s', src, dst)
     count += 1
-  if verbosity:
-    print "Copied/renamed %d files from %s to %s" % (count, src_dir, dst_dir)
-  return count, replace_count
+  if logging.getLogger().getEffectiveLevel() >= 20:
+    src_short = tool_utils.short_path(src_dir)
+    dst_short = tool_utils.short_path(dst_dir)
+    logging.info('Copied %d files (replacing %d) from %s to %s',
+        count, replace_count, src_short, dst_short)
 
 
-def build_svg_dir(dst_dir, clean=False, flags_only=False, verbosity=1):
-  """Copies/renames files from noto/color_emoji/svg and then noto/third_party/region-flags/svg,
-  giving them the standard format and prefix ('emoji_u' followed by codepoints expressed
-  in hex separated by underscore).  If clean, removes the target dir before proceding.
-  If flags_only, only does the region-flags."""
+def build_svg_dir(dst_dir, clean=False, emoji_dir='', flags_dir=''):
+  """Copies/renames files from emoji_dir and then flag_dir, giving them the
+  standard format and prefix ('emoji_u' followed by codepoints expressed in hex
+  separated by underscore).  If clean, removes the target dir before proceding.
+  If either emoji_dir or flag_dir are empty, skips them."""
 
-  if not os.path.isdir(dst_dir):
-    os.makedirs(dst_dir)
-  elif clean:
-    shutil.rmtree(dst_dir)
-    os.makedirs(dst_dir)
+  dst_dir = tool_utils.ensure_dir_exists(dst_dir, clean=clean)
 
-  # get files from path relative to noto
-  notopath = re.match("^.*/noto/", os.path.realpath(__file__)).group()
+  if not emoji_dir and not flag_dir:
+    logging.warning('Nothing to do.')
+    return
 
-  # copy region flags, generating new names based on the tlds.
-  flag_dir = os.path.join(notopath, "third_party/region-flags/svg")
-  count, replace_count = copy_with_rename(
-    flag_dir, dst_dir, accept_pred=_is_svg, rename=_flag_rename, verbosity=verbosity)
+  if emoji_dir:
+    copy_with_rename(
+        emoji_dir, dst_dir, accept_pred=_is_svg_and_startswith_emoji)
 
-  # copy the 'good' svg
-  if not flags_only:
-    svg_dir = os.path.join(notopath, "color_emoji/svg")
-    temp_count, temp_replace_count = copy_with_rename(
-      svg_dir, dst_dir, accept_pred=_is_svg_and_startswith_emoji, verbosity=verbosity)
-    count += temp_count
-    replace_count += temp_replace_count
-
-  if verbosity:
-    if replace_count:
-      print "Replaced %d existing files" % replace_count
-    print "Created %d total files" % (count - replace_count)
+  if flags_dir:
+     copy_with_rename(
+        flags_dir, dst_dir, accept_pred=_is_svg, rename=_flag_rename)
 
 
 def main(argv):
+  DEFAULT_EMOJI_DIR = '[emoji]/svg'
+  DEFAULT_FLAGS_DIR = '[emoji]/third_party/region-flags/svg'
+
   parser = argparse.ArgumentParser(
-      description="Collect svg files into target directory with prefix.")
-  parser.add_argument('dst_dir', help="Directory to hold symlinks to files.")
-  parser.add_argument('--clean', '-c', help="Replace target directory", action='store_true')
-  parser.add_argument('--flags_only', '-fo', help="Only copy region-flags", action='store_true')
-  parser.add_argument('--quiet', '-q', dest='v', help="quiet operation.", default=1,
-                      action='store_const', const=0)
-  parser.add_argument('--verbose', '-v', dest='v', help="verbose operation.",
-                      action='store_const', const=2)
+      description='Collect svg files into target directory with prefix.')
+  parser.add_argument(
+      'dst_dir', help='Directory to hold copied files.', metavar='dir')
+  parser.add_argument(
+      '--clean', '-c', help='Replace target directory', action='store_true')
+  parser.add_argument(
+      '--flags_dir', '-f', metavar='dir', help='directory containing flag svg, '
+      'default %s' % DEFAULT_FLAGS_DIR, default=DEFAULT_FLAGS_DIR)
+  parser.add_argument(
+      '--emoji_dir', '-e', metavar='dir',
+      help='directory containing emoji svg, default %s' % DEFAULT_EMOJI_DIR,
+      default=DEFAULT_EMOJI_DIR)
+  parser.add_argument(
+      '-l', '--loglevel', help='log level name/value', default='warning')
   args = parser.parse_args(argv)
 
-  build_svg_dir(args.dst_dir, clean=args.clean, flags_only=args.flags_only, verbosity=args.v)
+  tool_utils.setup_logging(args.loglevel)
+
+  args.flags_dir = tool_utils.resolve_path(args.flags_dir)
+  args.emoji_dir = tool_utils.resolve_path(args.emoji_dir)
+  build_svg_dir(
+      args.dst_dir, clean=args.clean, emoji_dir=args.emoji_dir,
+      flags_dir=args.flags_dir)
+
 
 if __name__ == '__main__':
   main(sys.argv[1:])
diff --git a/svg_builder.py b/svg_builder.py
index 8c1407e4..cab63b75 100755
--- a/svg_builder.py
+++ b/svg_builder.py
@@ -109,7 +109,8 @@ class SvgBuilder(object):
       wid = tree.attrs.get('width')
       ht = tree.attrs.get('height')
       if not (wid and ht):
-        raise "missing viewBox and width or height attrs"
+        raise ValueError(
+            'missing viewBox and width or height attrs (%s)' % filename)
       x, y, w, h = 0, 0, self._strip_px(wid), self._strip_px(ht)
 
     # We're going to assume default values for preserveAspectRatio for now,
@@ -175,9 +176,11 @@ class SvgBuilder(object):
     # svg element.  Unlike chrome.  So either we apply an inverse transform, or
     # insert a group with the clip between the svg and its children.  The latter
     # seems cleaner, ultimately.
-    clip_id = 'clip_' + ''.join(random.choice(string.ascii_lowercase) for i in range(8))
-    clip_text = """<g clip-path="url(#%s)"><clipPath id="%s">
-      <path d="M%g %gh%gv%gh%gz"/></clipPath></g>""" % (clip_id, clip_id, x, y, w, h, -w)
+    clip_id = 'clip_' + ''.join(
+        random.choice(string.ascii_lowercase) for i in range(8))
+    clip_text = ('<g clip-path="url(#%s)"><clipPath id="%s">'
+      '<path d="M%g %gh%gv%gh%gz"/></clipPath></g>' % (
+          clip_id, clip_id, x, y, w, h, -w))
     clip_tree = cleaner.tree_from_text(clip_text)
     clip_tree.contents.extend(tree.contents)
     tree.contents = [clip_tree]
diff --git a/svg_cleaner.py b/svg_cleaner.py
index be419046..58a20bcb 100755
--- a/svg_cleaner.py
+++ b/svg_cleaner.py
@@ -17,9 +17,14 @@
 
 import argparse
 import codecs
-import os.path
+import logging
+import os
+from os import path
 import re
 import sys
+
+from nototools import tool_utils
+
 from xml.parsers import expat
 from xml.sax import saxutils
 
@@ -115,16 +120,32 @@ class SvgCleaner(object):
 
   class _Cleaner(object):
     def _clean_elem(self, node):
+      viewBox, width, height = None, None, None
       nattrs = {}
       for k, v in node.attrs.items():
         if node.name == 'svg' and k in [
             'x', 'y', 'id', 'version', 'viewBox', 'width', 'height',
             'enable-background', 'xml:space']:
+          if k == 'viewBox':
+            viewBox = v
+          elif k == 'width':
+            width = v
+          elif k == 'height':
+            height = v
           continue
         v = re.sub('\s+', ' ', v)
         nattrs[k] = v
+
+      if node.name == 'svg':
+        if not width or not height:
+          if not viewBox:
+            raise ValueError('no viewBox, width, or height')
+          width, height = viewBox.split()[2:]
+        nattrs['width'] = width
+        nattrs['height'] = height
       node.attrs = nattrs
 
+
       # scan contents. remove any empty text nodes, or empty 'g' element nodes.
       # if a 'g' element has no attrs and only one subnode, replace it with the
       # subnode.
@@ -214,13 +235,16 @@ class SvgCleaner(object):
     return self.tree_to_text(tree)
 
 
-def clean_svg_files(in_dir, out_dir, match_pat=None, quiet=False):
+def clean_svg_files(in_dir, out_dir, match_pat=None, clean=False):
   regex = re.compile(match_pat) if match_pat else None
   count = 0
-  if not os.path.isdir(out_dir):
-    os.makedirs(out_dir)
-    if not quiet:
-      print 'created output directory: %s' % out_dir
+
+  if clean and path.samefile(in_dir, out_dir):
+    logging.error('Cannot clean %s (same as in_dir)', out_dir)
+    return
+
+  out_dir = tool_utils.ensure_dir_exists(out_dir, clean=clean)
+
   cleaner = SvgCleaner()
   for file_name in os.listdir(in_dir):
     if regex and not regex.match(file_name):
@@ -230,25 +254,45 @@ def clean_svg_files(in_dir, out_dir, match_pat=None, quiet=False):
       result = cleaner.clean_svg(in_fp.read())
     out_path = os.path.join(out_dir, file_name)
     with codecs.open(out_path, 'w', 'utf-8') as out_fp:
-      if not quiet:
-        print 'wrote: %s' % out_path
+      logging.debug('write: %s', out_path)
       out_fp.write(result)
       count += 1
   if not count:
-    print 'failed to match any files'
+    logging.warning('Failed to match any files')
   else:
-    print 'processed %s files to %s' % (count, out_dir)
+    logging.info('Wrote %s files to %s', count, out_dir)
 
 
 def main():
   parser = argparse.ArgumentParser(
       description="Generate 'cleaned' svg files.")
-  parser.add_argument('in_dir', help='Input directory.')
-  parser.add_argument('out_dir', help='Output directory.')
-  parser.add_argument('regex', help='Regex to select files, default matches all files.', default=None)
-  parser.add_argument('--quiet', '-q', help='Quiet operation.', action='store_true')
+  parser.add_argument(
+      'in_dir', help='Input directory.', metavar='dir')
+  parser.add_argument(
+      '-o', '--out_dir', help='Output directory, defaults to sibling of in_dir',
+      metavar='dir')
+  parser.add_argument(
+      '-c', '--clean', help='Clean output directory', action='store_true')
+  parser.add_argument(
+      '-r', '--regex', help='Regex to select files, default matches all files.',
+      metavar='regex', default=None)
+  parser.add_argument(
+      '-q', '--quiet', dest='v', help='Quiet operation.', default=1,
+      action='store_const', const=0)
+  parser.add_argument(
+      '-l', '--loglevel', help='log level name/value', default='warning')
   args = parser.parse_args()
-  clean_svg_files(args.in_dir, args.out_dir, match_pat=args.regex, quiet=args.quiet)
+
+  tool_utils.setup_logging(args.loglevel)
+
+  if not args.out_dir:
+    if args.in_dir.endswith('/'):
+      args.in_dir = args.in_dir[:-1]
+    args.out_dir = args.in_dir + '_clean'
+    logging.info('Writing output to %s', args.out_dir)
+
+  clean_svg_files(
+      args.in_dir, args.out_dir, match_pat=args.regex, clean=args.clean)
 
 
 if __name__ == '__main__':