cli: First draft of most of the CLI

8 files changed, 387 insertions, 109 deletions

diff --git a/gerbonara/apertures.py b/gerbonara/apertures.py
index a30cf13..4f41941 100644
--- a/gerbonara/apertures.py
+++ b/gerbonara/apertures.py
@@ -254,8 +254,8 @@ class CircleAperture(Aperture):
     def scaled(self, scale):
         return replace(self, 
                        diameter=self.diameter*scale,
-                       hold_dia=None if self.hole_dia is None else self.hole_dia*scale,
-                       hold_rect_h=None if self.hole_rect_h is None else self.hole_rect_h*scale)
+                       hole_dia=None if self.hole_dia is None else self.hole_dia*scale,
+                       hole_rect_h=None if self.hole_rect_h is None else self.hole_rect_h*scale)
 
     def to_macro(self):
         return ApertureMacroInstance(GenericMacros.circle, self._params(unit=MM))
@@ -310,8 +310,8 @@ class RectangleAperture(Aperture):
         return replace(self, 
                        w=self.w*scale,
                        h=self.h*scale,
-                       hold_dia=None if self.hole_dia is None else self.hole_dia*scale,
-                       hold_rect_h=None if self.hole_rect_h is None else self.hole_rect_h*scale)
+                       hole_dia=None if self.hole_dia is None else self.hole_dia*scale,
+                       hole_rect_h=None if self.hole_rect_h is None else self.hole_rect_h*scale)
 
     def to_macro(self):
         return ApertureMacroInstance(GenericMacros.rect,
@@ -375,15 +375,18 @@ class ObroundAperture(Aperture):
         return replace(self, 
                        w=self.w*scale,
                        h=self.h*scale,
-                       hold_dia=None if self.hole_dia is None else self.hole_dia*scale,
-                       hold_rect_h=None if self.hole_rect_h is None else self.hole_rect_h*scale)
+                       hole_dia=None if self.hole_dia is None else self.hole_dia*scale,
+                       hole_rect_h=None if self.hole_rect_h is None else self.hole_rect_h*scale)
 
     def to_macro(self):
         # generic macro only supports w > h so flip x/y if h > w
-        inst = self if self.w > self.h else replace(self, w=self.h, h=self.w, **_rotate_hole_90(self), rotation=self.rotation-90)
+        if self.w > self.h:
+            inst = self
+        else:
+            inst = replace(self, w=self.h, h=self.w, **self._rotate_hole_90(), rotation=self.rotation-90)
         return ApertureMacroInstance(GenericMacros.obround,
                 [MM(inst.w, self.unit),
-                 MM(ints.h, self.unit),
+                 MM(inst.h, self.unit),
                  MM(inst.hole_dia, self.unit),
                  MM(inst.hole_rect_h, self.unit),
                  inst.rotation])
@@ -434,7 +437,7 @@ class PolygonAperture(Aperture):
     def scaled(self, scale):
         return replace(self, 
                        diameter=self.diameter*scale,
-                       hold_dia=None if self.hole_dia is None else self.hole_dia*scale)
+                       hole_dia=None if self.hole_dia is None else self.hole_dia*scale)
 
     def to_macro(self):
         return ApertureMacroInstance(GenericMacros.polygon, self._params(MM))
diff --git a/gerbonara/cam.py b/gerbonara/cam.py
index a289371..4944945 100644
--- a/gerbonara/cam.py
+++ b/gerbonara/cam.py
@@ -76,6 +76,11 @@ class FileSettings:
             num = self.number_format[1 if self.zeros == 'leading' else 0] or 0
             self._pad = '0'*num
 
+    @classmethod
+    def defaults(kls):
+        """ Return a set of good default FileSettings that will work for all gerber or excellon files. """
+        return FileSettings(unit=MM, number_format=(4,5), zeros=None)
+
     def to_radian(self, value):
         """ Convert a given numeric string or a given float from file units into radians. """
         value = float(value)
@@ -386,6 +391,16 @@ class CamFile:
         """
         raise NotImplementedError()
 
+    def scale(self, factor, unit=MM):
+        """ Scale all objects in this file by the given factor. Only uniform scaling using a single factor in both
+        directions is supported as for both Gerber and Excellon files, nonuniform scaling would distort circular
+        flashes, which would lead to garbage results.
+
+        :param float factor: Scale factor
+        :param unit: :py:class:`.LengthUnit` or str (``'mm'`` or ``'inch'``). Unit ``cx`` and ``cy`` are passed in. Default: mm
+        """
+        raise NotImplementedError()
+
     @property
     def is_empty(self):
         """ Check if there are any objects in this file. """
diff --git a/gerbonara/cli.py b/gerbonara/cli.py
index 906997b..1cdfd42 100644
--- a/gerbonara/cli.py
+++ b/gerbonara/cli.py
@@ -1,71 +1,122 @@
 #!/usr/bin/env python3
 
+import math
 import click
 import re
+import warnings
+import json
+from pathlib import Path
 
 from .utils import MM, Inch
 from .cam import FileSettings
 from .rs274x import GerberFile
+from .layers import LayerStack, NamingScheme
 from . import __version__
 
 
+NAMING_SCHEMES = [n for n in dir(NamingScheme) if not n.startswith('_')]
+
 def print_version(ctx, param, value):
-    click.echo(f'Version {__version__}')
+    if value and not ctx.resilient_parsing:
+        click.echo(f'Version {__version__}')
+        ctx.exit()
 
 
-@click.group()
-@click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
-def cli():
-    pass
+def apply_transform(transform, unit, layer_or_stack):
+    def translate(x, y):
+        layer_or_stack.offset(x, y, unit)
 
+    def scale(factor):
+        """ Scale layer by a given factor, e.g. 1.0 for no change, 2.0 to double all coordinates in both axes. Note that
+        we only offer uniform scaling with a single factor applied along both coordinate axes because anything else
+        would not be possible with arbitrary Gerber apertures, and definitely mess up holes. We could still do this, but
+        the result would almost certainly not be what the user is looking for.
 
-@cli.command()
-@click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
-@click.argument('infiles', nargs=-1, required=True)
-@click.argument('outfile', required=False)
-def render(infiles, outfile):
-    """ Render one or more gerber files into an SVG file. Can process entire folders or zip files of gerber files, and
-    can render individual files from zips using "[zip file]:[member]" syntax. To specify a layer mapping, use
-    "[layer]=[file]" syntax, e.g. "top-silk=something.zip:foo/bar.gbr". Layers get merged in the same order that they
-    appear on the command line, and for each logical layer only the last given file is rendered."""
+        The main reason why this function might make sense is to fix up boards exported as G-code by programs that
+        aren't EDA tools and that for whatever reason ended up exporting in a weird unit."""
+        layer_or_stack.scale(factor)
 
+    def rotate(angle, cx=0, cy=0):
+        layer_or_stack.rotate(math.radians(angle), (cx, cy), unit)
 
-def apply_transform(transform, unit, layer):
-    for name, args, garbage in re.finditer(r'\s*([a-z]+)\s*\([\s-.0-9]*\)\s*|.*'):
-        if name not in ('translate', 'scale', 'rotate'):
-            raise ValueError(f'Unsupported transform {name}. Supported transforms are "translate", "scale" and "rotate".')
+    (x_min, y_min), (x_max, y_max) = layer_or_stack.bounding_box(unit, default=((0, 0), (0, 0)))
+    width, height = x_max - x_min, y_max - y_min
 
-        args = [float(args) for arg in args.split()]
-        if not args:
-            raise ValueError('No transform arguments given')
+    def origin():
+        translate(-x_min, -y_min)
 
-        if name == 'translate':
-            if len(args) != 2:
-                raise ValueError(f'transform "translate" requires exactly two coordinates (x, and y), not {len(args)}')
+    def center():
+        translate(-x_min-width/2, -y_min-height/2)
 
-            x, y = args
-            layer.offset(x, y, unit)
+    exec(transform, {key: value for key, value in math.__dict__.items() if not key.startswith('_')}, locals())
 
-        elif name == 'scale':
-            if len(args) > 1:
-                # We don't support non-uniform scaling with scale_x != scale_y since that isn't possible with straight
-                # Gerber polygon or circular apertures, or holes.
-                raise ValueError(f'transform "scale" requires exactly one argument, not {len(args)}')
 
-            layer.scale(*args)
+@click.group()
+@click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
+def cli():
+    pass
 
-        elif name == 'rotate':
-            if len(args) not in (1, 3):
-                raise ValueError(f'transform "rotate" requires either one or three coordinates (angle, origin x, and origin y), not {len(args)}')
 
-            angle = args[0]
-            cx, cy = args[1:] or (0, 0)
-            layer.rotate(angle, cx, cy, unit)
+@cli.command()
+@click.option('--format-warnings/--no-warnings', ' /-s', default=False, help='''Enable or disable file format warnings
+              during parsing (default: off)''')
+@click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
+@click.option('-m', '--input-map', type=click.Path(exists=True, path_type=Path), help='''Extend or override layer name
+              mapping with name map from JSON file. The JSON file must contain a single JSON dict with an arbitrary
+              number of string: string entries. The keys are interpreted as regexes applied to the filenames via
+              re.fullmatch, and each value must either be the string "ignore" to remove this layer from previous
+              automatic guesses, or a gerbonara layer name such as "top copper", "inner_2 copper" or "bottom silk".''')
+@click.option('--use-builtin-name-rules/--no-builtin-name-rules', default=True, help='''Disable built-in layer name
+              rules and use only rules given by --input-map''')
+@click.option('--force-zip', is_flag=True, help='''Force treating input path as a zip file (default: guess file type
+              from extension and contents)''')
+@click.option('--top/--bottom', help='Which side of the board to render')
+@click.option('--command-line-units', type=click.Choice(['metric', 'us-customary']), default='metric', help='Units for values given in --transform. Default: millimeter')
+@click.option('--margin', type=float, default=0.0, help='Add space around the board inside the viewport')
+@click.option('--force-bounds', help='Force SVG bounding box to value given as "min_x,min_y,max_x,max_y"')
+@click.option('--inkscape/--standard-svg', default=True, help='Export in Inkscape SVG format with layers and stuff.')
+@click.option('--colorscheme', type=click.Path(exists=True, path_type=Path), help='''Load colorscheme from given JSON
+              file. The JSON file must contain a single dict with keys copper, silk, mask, paste, drill and outline.
+              Each key must map to a string containing either a normal 6-digit hex color with leading hash sign, or an
+              8-digit hex color with leading hash sign, where the last two digits set the layer's alpha value (opacity),
+              with FF being completely opaque, and 00 being invisibly transparent.''')
+@click.argument('inpath', type=click.Path(exists=True))
+@click.argument('outfile', type=click.File('w'), default='-')
+def render(inpath, outfile, format_warnings, input_map, use_builtin_name_rules, force_zip, top, command_line_units,
+           margin, force_bounds, inkscape, colorscheme):
+    """ Render a gerber file, or a directory or zip of gerber files into an SVG file. """
+
+    overrides = json.loads(input_map.read_bytes()) if input_map else None
+    with warnings.catch_warnings():
+        warnings.simplefilter('default' if format_warnings else 'ignore')
+        if force_zip:
+            stack = LayerStack.open_zip(inpath, overrides=overrides, autoguess=use_builtin_name_rules)
+        else:
+            stack = LayerStack.open(inpath, overrides=overrides, autoguess=use_builtin_name_rules)
+
+    unit = MM if command_line_units == 'metric' else Inch
+
+    if force_bounds:
+        min_x, min_y, max_x, max_y = list(map(float, force_bounds.split(',')))
+        force_bounds = (min_x, min_y), (max_x, max_y)
+
+    if colorscheme:
+        colorscheme = json.loads(colorscheme.read_text())
+
+    outfile.write(str(stack.to_pretty_svg(side='top' if top else 'bottom', margin=margin, arg_unit=unit, svg_unit=MM,
+                        force_bounds=force_bounds, inkscape=inkscape, colors=colorscheme)))
 
 
 @cli.command()
 @click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
-@click.option('-t', '--transform', help='Apply transform given in pseudo-SVG syntax. Supported are "translate", "scale" and "rotate". Example: "translate(-10 0) rotate(45 0 5)"')
+@click.option('--format-warnings/--no-warnings', ' /-s', default=True, help='''Enable or disable file format warnings
+              during parsing (default: on)''')
+@click.option('-t', '--transform', help='''Execute python transformation script on input. You have access to the functions
+              translate(x, y), scale(factor) and rotate(angle, center_x?, center_y?), the bounding box variables x_min,
+              y_min, x_max, y_max, width and height, and everything from python\'s built-in math module (e.g. pi, sqrt,
+              sin). As convenience methods, center() and origin() are provided to center the board resp. move its
+              bottom-left corner to the origin. Coordinates are given in --command-line-units, angles in degrees, and
+              scale as a scale factor (as opposed to a percentage). Example: "translate(-10, 0); rotate(45, 0, 5)"''')
 @click.option('--command-line-units', type=click.Choice(['metric', 'us-customary']), default='metric', help='Units for values given in --transform. Default: millimeter')
 @click.option('-n', '--number-format', help='Override number format to use during export in "[integer digits].[decimal digits]" notation, e.g. "2.6".')
 @click.option('-u', '--units', type=click.Choice(['metric', 'us-customary']), help='Override export file units')
@@ -78,7 +129,7 @@ def apply_transform(transform, unit, layer):
 @click.argument('infile')
 @click.argument('outfile')
 def rewrite(transform, command_line_units, number_format, units, zero_suppression, keep_comments, reuse_input_settings,
-            input_number_format, input_units, input_zero_suppression, infile, outfile):
+            input_number_format, input_units, input_zero_suppression, infile, outfile, format_warnings):
     """ Parse a gerber file, apply transformations, and re-serialize it into a new gerber file. Without transformations,
     this command can be used to convert a gerber file to use different settings (e.g. units, precision), but can also be
     used to "normalize" gerber files in a weird format into a more standards-compatible one as gerbonara's gerber parser
@@ -95,7 +146,9 @@ def rewrite(transform, command_line_units, number_format, units, zero_suppressio
     if input_units:
         input_settings.unit = MM if input_units == 'metric' else Inch
 
-    f = GerberFile.open(infile, override_settings=input_settings)
+    with warnings.catch_warnings():
+        warnings.simplefilter('default' if format_warnings else 'ignore')
+        f = GerberFile.open(infile, override_settings=input_settings)
 
     if transform:
         command_line_units = MM if command_line_units == 'metric' else Inch
@@ -104,10 +157,11 @@ def rewrite(transform, command_line_units, number_format, units, zero_suppressio
     if reuse_input_settings:
         output_settings = FileSettings()
     else:
-        output_settings = FileSettings(unit=MM, number_format=(4,5), zeros=None)
+        output_settings = FileSettings.defaults()
 
     if number_format:
-        output_settings = number_format
+        a, _, b = number_format.partition('.')
+        output_settings.number_format = (int(a), int(b))
 
     if units:
         output_settings.unit = MM if units == 'metric' else Inch
@@ -120,12 +174,84 @@ def rewrite(transform, command_line_units, number_format, units, zero_suppressio
 
 @cli.command()
 @click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
+@click.option('-m', '--input-map', type=click.Path(exists=True, path_type=Path), help='''Extend or override layer name
+              mapping with name map from JSON file. The JSON file must contain a single JSON dict with an arbitrary
+              number of string: string entries. The keys are interpreted as regexes applied to the filenames via
+              re.fullmatch, and each value must either be the string "ignore" to remove this layer from previous
+              automatic guesses, or a gerbonara layer name such as "top copper", "inner_2 copper" or "bottom silk".''')
+@click.option('--use-builtin-name-rules/--no-builtin-name-rules', default=True, help='''Disable built-in layer name
+              rules and use only rules given by --input-map''')
+@click.option('--format-warnings/--no-warnings', ' /-s', default=True, help='''Enable or disable file format warnings
+              during parsing (default: on)''')
+@click.option('--units', type=click.Choice(['metric', 'us-customary']), default='metric', help='''Units for values given
+              in transform script. Default: millimeter''')
+@click.option('-n', '--number-format', help='''Override number format to use during export in
+              "[integer digits].[decimal digits]" notation, e.g. "2.6".''')
+@click.option('-u', '--units', type=click.Choice(['metric', 'us-customary']), help='Override export file units')
+@click.option('-z', '--zero-suppression', type=click.Choice(['off', 'leading', 'trailing']), help='''Override export zero
+              suppression setting for exported Gerber files. Note: This does not affect Excellon output, which *always*
+              uses explicit decimal points to avoid mismatches between output format and metadata in job files untouched
+              by gerbonara.''')
+@click.option('--reuse-input-settings/--default-settings,', default=False, help='''Use the same export settings as the
+              input file instead of sensible defaults.''')
+@click.option('--force-zip', is_flag=True, help='''Force treating input path as a zip file (default: guess file type
+              from extension and contents)''')
+@click.option('--output-naming-scheme', type=click.Choice(NAMING_SCHEMES), help=f'''Name output files according to the
+              selected naming scheme instead of keeping the old file names. Supported values are:
+              {", ".join(NAMING_SCHEMES)}''')
+@click.argument('transform')
+@click.argument('inpath')
+@click.argument('outpath')
+def transform(transform, units, number_format, zero_suppression, reuse_input_settings, inpath, outpath,
+            format_warnings, input_map, use_builtin_name_rules):
+    """ Transform all gerber files in a given directory or zip file using the given python transformation script.
+        
+        In the python transformation script you have access to the functions translate(x, y), scale(factor) and
+        rotate(angle, center_x?, center_y?), the bounding box variables x_min, y_min, x_max, y_max, width and height,
+        and everything from python\'s built-in math module (e.g. pi, sqrt, sin). As convenience methods, center() and
+        origin() are provided to center the board resp. move its bottom-left corner to the origin. Coordinates are given
+        in --command-line-units, angles in degrees, and scale as a scale factor (as opposed to a percentage). Example:
+        "translate(-10, 0); rotate(45, 0, 5)"''')
+    """
+
+    overrides = json.loads(input_map.read_bytes()) if input_map else None
+    with warnings.catch_warnings():
+        warnings.simplefilter('default' if format_warnings else 'ignore')
+        if force_zip:
+            stack = LayerStack.open_zip(path, overrides=overrides, autoguess=use_builtin_name_rules)
+        else:
+            stack = LayerStack.open(path, overrides=overrides, autoguess=use_builtin_name_rules)
+
+    units = MM if units == 'metric' else Inch
+    apply_transform(transform, units, stack)
+
+    output_settings = FileSettings() if reuse_input_settings else FileSettings.defaults()
+
+    if number_format:
+        a, _, b = number_format.partition('.')
+        output_settings.number_format = (int(a), int(b))
+
+    if units:
+        output_settings.unit = MM if units == 'metric' else Inch
+
+    if zero_suppression:
+        output_settings.zeros = None if zero_suppression == 'off' else zero_suppression
+
+    stack.save_to_directory(outpath, naming_scheme=naming_scheme,
+                            gerber_settings=output_settings,
+                            excellon_settings=output_settings.replace(zeros=None))
+
+
+@cli.command()
+@click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
+@click.option('--format-warnings/--no-warnings', ' /-s', default=True, help='''Enable or disable file format warnings
+              during parsing (default: on)''')
 @click.option('--units', type=click.Choice(['us-customary', 'metric']), default='metric', help='Output bounding box in this unit (default: millimeter)')
 @click.option('--input-number-format', help='Override number format of input file (mostly useful for Excellon files)')
 @click.option('--input-units', type=click.Choice(['us-customary', 'metric']), help='Override units of input file')
 @click.option('--input-zero-suppression', type=click.Choice(['off', 'leading', 'trailing']), help='Override zero suppression setting of input file')
 @click.argument('infile')
-def bounding_box(infile, input_number_format, input_units, input_zero_suppression, units):
+def bounding_box(infile, format_warnings, input_number_format, input_units, input_zero_suppression, units):
     """ Print the bounding box of a gerber file in "[x_min] [y_min] [x_max] [y_max]" format. The bounding box contains
     all graphic objects in this file, so e.g. a 100 mm by 100 mm square drawn with a 1mm width circular aperture will
     result in an 101 mm by 101 mm bounding box.
@@ -142,12 +268,105 @@ def bounding_box(infile, input_number_format, input_units, input_zero_suppressio
     if input_units:
         input_settings.unit = MM if input_units == 'metric' else Inch
 
-    f = GerberFile.open(infile, override_settings=input_settings)
+    with warnings.catch_warnings():
+        warnings.simplefilter('default' if format_warnings else 'ignore')
+        f = GerberFile.open(infile, override_settings=input_settings)
+
     units = MM if units == 'metric' else Inch
     (x_min, y_min), (x_max, y_max) = f.bounding_box(unit=units)
     print(f'{x_min:.6f} {y_min:.6f} {x_max:.6f} {y_max:.6f} [{units}]')
 
 
+@cli.command()
+@click.option('--format-warnings/--no-warnings', ' /-s', default=True, help='''Enable or disable file format warnings
+              during parsing (default: on)''')
+@click.option('--force-zip', is_flag=True, help='Force treating input path as zip file (default: guess file type from extension and contents)')
+@click.argument('path', type=click.Path(exists=True))
+def layers(path, force_zip, format_warnings):
+    with warnings.catch_warnings():
+        warnings.simplefilter('default' if format_warnings else 'ignore')
+        if force_zip:
+            stack = LayerStack.open_zip(path)
+        else:
+            stack = LayerStack.open(path)
+
+    print(f'Detected board name: {stack.board_name}')
+    print(f'Probably exported by: {stack.generator or "Unknown"}')
+    print(f'Board bounding box: {stack.bounding_box()} [mm]')
+
+    if stack.netlist:
+        print(f'Found netlist at {stack.netlist.original_path}')
+    else:
+        print('No netlist found')
+
+    print('Graphical layers:')
+    for (side, function), layer in stack.graphic_layers.items():
+        print(f'{side} {function}: {layer}')
+    if not stack.graphic_layers:
+        print('(no graphical layers)')
+
+    print('Drill layers:')
+    for layer in stack.drill_layers:
+        print(layer)
+    if not stack.drill_layers:
+        print('(no drill layers)')
+
+
+@cli.command()
+@click.option('--format-warnings/--no-warnings', ' /-s', default=False, help='''Enable or disable file format warnings
+              during parsing (default: off)''')
+@click.option('--force-zip', is_flag=True, help='Force treating input path as zip file (default: guess file type from extension and contents)')
+@click.argument('path', type=click.Path(exists=True))
+def meta(path, force_zip, format_warnings):
+    """ Extract layer mapping and print it along with layer metadata as JSON to stdout. A machine-readable variant of
+    the "layers" command. All lengths in the JSON are given in millimeter. """
+
+    with warnings.catch_warnings():
+        warnings.simplefilter('default' if format_warnings else 'ignore')
+        if force_zip:
+            stack = LayerStack.open_zip(path)
+        else:
+            stack = LayerStack.open(path)
+
+    out = {}
+    out['board_name'] = stack.board_name
+    out['generator'] = stack.generator
+    (min_x, min_y), (max_x, max_y) = stack.bounding_box(default=((None, None), (None, None)))
+    out['bounding_box'] = {'min_x': min_x, 'min_y': min_y, 'max_x': max_x, 'max_y': max_y}
+    out['path'] = str(stack.original_path)
+
+    if stack.netlist:
+        out['netlist'] = {
+                'format': 'IPC-356',
+                'path': str(stack.netlist.original_path),
+                'records': len(stack.netlist.test_records),
+                'conductors': len(stack.netlist.conductors),
+                'outlines': len(stack.netlist.outlines),
+        }
+
+    out['graphical_layers'] = {}
+    for (side, function), layer in stack.graphic_layers.items():
+        d = out['graphical_layers'][side] = out['graphical_layers'].get(side, {})
+        (min_x, min_y), (max_x, max_y) = layer.bounding_box(default=((None, None), (None, None)))
+        d[function] = {
+                'format': 'Gerber',
+                'path': str(layer.original_path),
+                'apertures': len(layer.apertures),
+                'objects': len(layer.objects),
+                'bounding_box': {'min_x': min_x, 'min_y': min_y, 'max_x': max_x, 'max_y': max_y},
+        }
+
+    out['drill_layers'] = []
+    for layer in stack.drill_layers:
+        out['drill_layers'].append({
+            'format': 'Excellon',
+            'path': str(layer.original_path),
+            'plating': layer.plating_type,
+        })
+
+    print(json.dumps(out))
+
+
 if __name__ == '__main__':
     cli()
 
diff --git a/gerbonara/excellon.py b/gerbonara/excellon.py
index ea5eba4..31ff53f 100755
--- a/gerbonara/excellon.py
+++ b/gerbonara/excellon.py
@@ -207,18 +207,21 @@ class ExcellonFile(CamFile):
 
     def __str__(self):
         name = f'{self.original_path.name} ' if self.original_path else ''
+        return f'<ExcellonFile {name}{self.plating_type} with {len(list(self.drills()))} drills, {len(list(self.slots()))} slots using {len(self.drill_sizes())} tools>'
+
+    def __repr__(self):
+        return str(self)
+
+    @property
+    def plating_type(self):
         if self.is_plated:
-            plating = 'plated'
+            return 'plated'
         elif self.is_nonplated:
-            plating = 'nonplated'
+            return 'nonplated'
         elif self.is_mixed_plating:
-            plating = 'mixed plating'
+            return 'mixed plating'
         else:
-            plating = 'unknown plating'
-        return f'<ExcellonFile {name}{plating} with {len(list(self.drills()))} drills, {len(list(self.slots()))} slots using {len(self.drill_sizes())} tools>'
-
-    def __repr__(self):
-        return str(self)
+            return 'unknown plating'
 
     @property
     def is_plated(self):
diff --git a/gerbonara/graphic_objects.py b/gerbonara/graphic_objects.py
index 4fa5fce..4fd0de8 100644
--- a/gerbonara/graphic_objects.py
+++ b/gerbonara/graphic_objects.py
@@ -105,20 +105,19 @@ class GraphicObject:
         dx, dy = self.unit(dx, unit), self.unit(dy, unit)
         self._offset(dx, dy)
 
-    def scale(self, sx, sy, unit=MM):
+    def scale(self, factor, unit=MM):
         """ Scale this feature in both its dimensions and location.
 
-        .. note:: The scale values are scalars, and the unit argument is irrelevant, but is kept for API consistency.
+        .. note:: The scale factor is a scalar, and the unit argument is irrelevant, but is kept for API consistency.
         
         .. note:: If this object references an aperture, this aperture is not modified. You will have to transform this
                   aperture yourself.
 
-        :param float sx: X scale, 1 to keep the object as is, larger values to enlarge, smaller values to shrink.
-                         Negative values are permitted.
-        :param float sy: Y scale as above.
+        :param float factor: Scale factor, 1 to keep the object as is, larger values to enlarge, smaller values to
+                             shrink. Negative values are permitted.
         """
 
-        self._scale(sx, sy)
+        self._scale(factor)
 
     def rotate(self, rotation, cx=0, cy=0, unit=MM):
         """ Rotate this object. The center of rotation can be given in either unit, and is automatically converted into
@@ -232,9 +231,9 @@ class Flash(GraphicObject):
     def _rotate(self, rotation, cx=0, cy=0):
         self.x, self.y = gp.rotate_point(self.x, self.y, rotation, cx, cy)
 
-    def _scale(self, sx, sy):
-        self.x *= sx
-        self.y *= sy
+    def _scale(self, factor):
+        self.x *= factor
+        self.y *= factor
 
     def to_primitives(self, unit=None):
         conv = self.converted(unit)
@@ -303,10 +302,10 @@ class Region(GraphicObject):
                 (arc[0], gp.rotate_point(*arc[1], angle, cx-p[0], cy-p[1])) if arc else None
                 for p, arc in zip(self.outline, self.arc_centers) ]
 
-    def _scale(self, sx, sy):
-        self.outline = [ (x*sx, y*sy) for x, y in self.outline ]
+    def _scale(self, factor):
+        self.outline = [ (x*factor, y*factor) for x, y in self.outline ]
         self.arc_centers = [
-                (arc[0], (arc[1][0]*sx, arc[1][1]*sy)) if arc else None
+                (arc[0], (arc[1][0]*factor, arc[1][1]*factor)) if arc else None
                 for p, arc in zip(self.outline, self.arc_centers) ]
 
     def append(self, obj):
@@ -407,11 +406,11 @@ class Line(GraphicObject):
         self.x1, self.y1 = gp.rotate_point(self.x1, self.y1, rotation, cx, cy)
         self.x2, self.y2 = gp.rotate_point(self.x2, self.y2, rotation, cx, cy)
 
-    def _scale(self, sx=1, sy=1):
-        self.x1 *= sx
-        self.y1 *= sy
-        self.x2 *= sx
-        self.y2 *= sy
+    def _scale(self, factor):
+        self.x1 *= factor
+        self.y1 *= factor
+        self.x2 *= factor
+        self.y2 *= factor
 
     @property
     def p1(self):
@@ -645,13 +644,13 @@ class Arc(GraphicObject):
         self.x2, self.y2 = gp.rotate_point(self.x2, self.y2, rotation, cx, cy)
         self.cx, self.cy = new_cx - self.x1, new_cy - self.y1
 
-    def _scale(self, sx=1, sy=1):
-        self.x1 *= sx
-        self.y1 *= sy
-        self.x2 *= sx
-        self.y2 *= sy
-        self.cx *= sx
-        self.cy *= sy
+    def _scale(self, factor):
+        self.x1 *= factor
+        self.y1 *= factor
+        self.x2 *= factor
+        self.y2 *= factor
+        self.cx *= factor
+        self.cy *= factor
 
     def as_primitive(self, unit=None):
         conv = self.converted(unit)
diff --git a/gerbonara/layers.py b/gerbonara/layers.py
index 19d0195..820454c 100644
--- a/gerbonara/layers.py
+++ b/gerbonara/layers.py
@@ -144,8 +144,8 @@ def common_prefix(l):
         baseline = score(1)

         if len(l) - baseline > 5:

             continue

-        for n in range(2, len(cand)):

-            if len(l) - score(n) > 5:

+        for n in range(len(cand) if '.' not in cand else cand.index('.')+1, 2, -1):

+            if len(l) - score(n) < 5:

                 break

         out.append(cand[:n-1])

  

@@ -237,31 +237,31 @@ def layername_autoguesser(fn):
 

 

 class LayerStack:

-

-    def __init__(self, graphic_layers, drill_layers, netlist=None, board_name=None, original_path=None, was_zipped=False):

+    def __init__(self, graphic_layers, drill_layers, netlist=None, board_name=None, original_path=None, was_zipped=False, generator=None):

         self.graphic_layers = graphic_layers

         self.drill_layers = drill_layers

         self.board_name = board_name

         self.netlist = netlist

         self.original_path = original_path

         self.was_zipped = was_zipped

+        self.generator = generator

 

     @classmethod

-    def open(kls, path, board_name=None, lazy=False):

+    def open(kls, path, board_name=None, lazy=False, overrides=None, autoguess=True):

         if str(path) == '-':

             data_io = io.BytesIO(sys.stdin.buffer.read())

             return kls.from_zip_data(data_io, original_path='<stdin>', board_name=board_name, lazy=lazy)

 

         path = Path(path)

         if path.is_dir():

-            return kls.open_dir(path, board_name=board_name, lazy=lazy)

+            return kls.open_dir(path, board_name=board_name, lazy=lazy, overrides=overrides, autoguess=autoguess)

         elif path.suffix.lower() == '.zip' or is_zipfile(path):

-            return kls.open_zip(path, board_name=board_name, lazy=lazy)

+            return kls.open_zip(path, board_name=board_name, lazy=lazy, overrides=overrides, autoguess=autoguess)

         else:

-            return kls.from_files([path], board_name=board_name, lazy=lazy)

+            return kls.from_files([path], board_name=board_name, lazy=lazy, overrides=overrides, autoguess=autoguess)

 

     @classmethod

-    def open_zip(kls, file, original_path=None, board_name=None, lazy=False):

+    def open_zip(kls, file, original_path=None, board_name=None, lazy=False, overrides=None, autoguess=True):

         tmpdir = tempfile.TemporaryDirectory()

         tmp_indir = Path(tmpdir.name) / 'input'

         tmp_indir.mkdir()

@@ -276,20 +276,39 @@ class LayerStack:
         return inst

 

     @classmethod

-    def open_dir(kls, directory, board_name=None, lazy=False):

+    def open_dir(kls, directory, board_name=None, lazy=False, overrides=None, autoguess=True):

 

         directory = Path(directory)

         if not directory.is_dir():

             raise FileNotFoundError(f'{directory} is not a directory')

 

         files = [ path for path in directory.glob('**/*') if path.is_file() ]

-        return kls.from_files(files, board_name=board_name, lazy=lazy, original_path=directory)

+        return kls.from_files(files, board_name=board_name, lazy=lazy, original_path=directory, overrides=overrides,

+                              autoguess=autoguess)

         inst.original_path = directory

         return inst

 

     @classmethod

-    def from_files(kls, files, board_name=None, lazy=False, original_path=None, was_zipped=False):

-        generator, filemap = best_match(files)

+    def from_files(kls, files, board_name=None, lazy=False, original_path=None, was_zipped=False, overrides=None,

+                   autoguess=True):

+        if autoguess:

+            generator, filemap = best_match(files)

+        else:

+            generator, filemap = 'custom', {}

+        all_generator_hints = set()

+

+        if overrides:

+            for fn in files:

+                for expr, layer in overrides.items():

+                    if re.fullmatch(expr, fn.name):

+                        if layer == 'ignore':

+                            for entries in filemap.values():

+                                if fn in entries:

+                                    entries.remove(fn)

+                        else:

+                            if layer in filemap and fn in filemap[layer]:

+                                filemap[layer].remove(fn)

+                            filemap[layer] = filemap.get(layer, []) + [fn]

 

         if sum(len(files) for files in filemap.values()) < 6:

             warnings.warn('Ambiguous gerber filenames. Trying last-resort autoguesser.')

@@ -404,6 +423,7 @@ class LayerStack:
 

                 if not lazy:

                     hints = set(layer.generator_hints) | { generator }

+                    all_generator_hints |= hints

                     if len(hints) > 1:

                         warnings.warn('File identification returned ambiguous results. Please raise an issue on the '

                                 'gerbonara tracker and if possible please provide these input files for reference.')

@@ -414,7 +434,7 @@ class LayerStack:
             board_name = re.sub(r'\W+$', '', board_name)

 

         return kls(layers, drill_layers, netlist, board_name=board_name,

-                original_path=original_path, was_zipped=was_zipped)

+                original_path=original_path, was_zipped=was_zipped, generator=[*all_generator_hints, None][0])

 

     def save_to_zipfile(self, path, naming_scheme={}, overwrite_existing=True, prefix=''):

         if path.is_file():

@@ -428,7 +448,8 @@ class LayerStack:
                 with le_zip.open(prefix + str(path), 'w') as out:

                     out.write(layer.instance.write_to_bytes())

 

-    def save_to_directory(self, path, naming_scheme={}, overwrite_existing=True):

+    def save_to_directory(self, path, naming_scheme={}, overwrite_existing=True,

+                          gerber_settings=None, excellon_settings=None):

         outdir = Path(path)

         outdir.mkdir(parents=True, exist_ok=overwrite_existing)

 

@@ -442,7 +463,7 @@ class LayerStack:
         def get_name(layer_type, layer):

             nonlocal naming_scheme

 

-            if (m := re.match('inner_([0-9]*) copper', layer_type)):

+            if (m := re.match('inner_([0-9]+) copper', layer_type)):

                 layer_type = 'inner copper'

                 num = int(m[1])

             else:

@@ -569,6 +590,18 @@ class LayerStack:
         else:

             return self.bounding_box(unit=unit, default=default)

 

+    def offset(self, x=0, y=0, unit=MM):

+        for layer in itertools.chain(self.graphic_layers.values(), self.drill_layers):

+            layer.offset(x, y, unit=unit)

+

+    def rotate(self, angle, cx=0, cy=0, unit=MM):

+        for layer in itertools.chain(self.graphic_layers.values(), self.drill_layers):

+            layer.rotate(angle, cx, cy, unit=unit)

+

+    def scale(self, factor, unit=MM):

+        for layer in itertools.chain(self.graphic_layers.values(), self.drill_layers):

+            layer.scale(factor)

+

     def merge_drill_layers(self):

         target = ExcellonFile(comments=['Drill files merged by gerbonara'])

 

diff --git a/gerbonara/rs274x.py b/gerbonara/rs274x.py
index b480b86..f770c51 100644
--- a/gerbonara/rs274x.py
+++ b/gerbonara/rs274x.py
@@ -67,7 +67,7 @@ class GerberFile(CamFile):
                 not isinstance(obj.aperture, apertures.CircleAperture):
                 raise ValueError(f'Cannot convert {obj} to excellon!')
 
-            if not (new_tool := new_tools.get(id(obj.aperture))):
+            if not (new_tool := new_tools.get(obj.aperture)):
                 # TODO plating?
                 new_tool = new_tools[id(obj.aperture)] = apertures.ExcellonTool(obj.aperture.diameter, plated=plated, unit=obj.aperture.unit)
             new_objs.append(dataclasses.replace(obj, aperture=new_tool))
@@ -271,16 +271,19 @@ class GerberFile(CamFile):
     def __len__(self):
         return len(self.objects)
 
-    def scale(self, scale, unit=MM):
+    def scale(self, factor, unit=MM):
         scaled_apertures = {}
 
+        for ap in self.apertures:
+            scaled_apertures[id(ap)] = ap.scaled(factor)
+
         for obj in self.objects:
-            obj.scale(sx, sy)
+            obj.scale(factor)
+
+            if (obj_ap := getattr(obj, 'aperture', None)):
+                obj.aperture = scaled_apertures[id(obj_ap)]
 
-            if (aperture := getattr(obj, 'aperture', None)):
-                if not (scaled := scaled_apertures.get(aperture)):
-                    scaled = scaled_apertures[aperture] = aperture.scaled(scale)
-                obj.aperture = scaled
+        self.apertures = list(scaled_apertures.values())
 
     def offset(self, dx=0,  dy=0, unit=MM):
         # TODO round offset to file resolution
diff --git a/gerbonara/utils.py b/gerbonara/utils.py
index 586232a..83dc471 100644
--- a/gerbonara/utils.py
+++ b/gerbonara/utils.py
@@ -68,6 +68,9 @@ class LengthUnit:
         self.shorthand = shorthand
         self.factor = this_in_mm
 
+    def __hash__(self):
+        return hash((self.name, self.shorthand, self.factor))
+
     def convert_from(self, unit, value):
         """ Convert ``value`` from ``unit`` into this unit.