Rack/helper.py

#!/usr/bin/env python3

import sys
import os
import re
import json
import xml.etree.ElementTree


# Version check
f"Python 3.6+ is required"


class UserException(Exception):
    pass


def eprint(*args, **kwargs):
	print(*args, file=sys.stderr, **kwargs)


def find(f, array):
	for a in array:
		if f(a):
			return f

def input_default(prompt, default=""):
	str = input(f"{prompt} [{default}]: ")
	if str == "":
		return default
	return str


def is_valid_slug(slug):
	return re.match(r'^[a-zA-Z0-9_\-]+$', slug) != None


def str_to_identifier(s):
	if not s:
		return "_"
	# Identifiers can't start with a number
	if s[0].isdigit():
		s = "_" + s
	# Capitalize first letter
	s = s[0].upper() + s[1:]
	# Replace special characters with underscore
	s = re.sub(r'\W', '_', s)
	return s


def create_plugin(slug, plugin_dir=None):
	# Check slug
	if not is_valid_slug(slug):
		raise UserException("Slug must only contain ASCII letters, numbers, '-', and '_'.")

	if not plugin_dir:
		plugin_dir = os.path.join(slug, '')

	# Check if plugin directory exists
	if os.path.exists(plugin_dir):
		raise UserException(f"Directory {plugin_dir} already exists")

	# Create plugin directory
	os.mkdir(plugin_dir)

	# Create manifest
	try:
		create_manifest(slug, plugin_dir)
	except Exception as e:
		os.rmdir(plugin_dir)
		raise e

	# Create subdirectories
	os.mkdir(os.path.join(plugin_dir, "src"))
	os.mkdir(os.path.join(plugin_dir, "res"))

	# Create Makefile
	makefile = """# If RACK_DIR is not defined when calling the Makefile, default to two directories above
RACK_DIR ?= ../..

# FLAGS will be passed to both the C and C++ compiler
FLAGS +=
CFLAGS +=
CXXFLAGS +=

# Careful about linking to shared libraries, since you can't assume much about the user's environment and library search path.
# Static libraries are fine, but they should be added to this plugin's build system.
LDFLAGS +=

# Add .cpp files to the build
SOURCES += $(wildcard src/*.cpp)

# Add files to the ZIP package when running `make dist`
# The compiled plugin and "plugin.json" are automatically added.
DISTRIBUTABLES += res
DISTRIBUTABLES += $(wildcard LICENSE*)
DISTRIBUTABLES += $(wildcard presets)

# Include the Rack plugin Makefile framework
include $(RACK_DIR)/plugin.mk
"""
	with open(os.path.join(plugin_dir, "Makefile"), "w") as f:
		f.write(makefile)

	# Create plugin.hpp
	plugin_hpp = """#pragma once
#include <rack.hpp>


using namespace rack;

// Declare the Plugin, defined in plugin.cpp
extern Plugin* pluginInstance;

// Declare each Model, defined in each module source file
// extern Model* modelMyModule;
"""
	with open(os.path.join(plugin_dir, "src/plugin.hpp"), "w") as f:
		f.write(plugin_hpp)

	# Create plugin.cpp
	plugin_cpp = """#include "plugin.hpp"


Plugin* pluginInstance;


void init(Plugin* p) {
	pluginInstance = p;

	// Add modules here
	// p->addModel(modelMyModule);

	// Any other plugin initialization may go here.
	// As an alternative, consider lazy-loading assets and lookup tables when your module is created to reduce startup times of Rack.
}
"""
	with open(os.path.join(plugin_dir, "src/plugin.cpp"), "w") as f:
		f.write(plugin_cpp)

	git_ignore = """/build
/dist
/*.so
/*.dylib
/*.dll
.DS_Store
"""
	with open(os.path.join(plugin_dir, ".gitignore"), "w") as f:
		f.write(git_ignore)

	eprint(f"Created template plugin in {plugin_dir}")
	os.system(f"cd {plugin_dir} && git init")
	eprint(f"You may use `make`, `make clean`, `make dist`, `make install`, etc in the {plugin_dir} directory.")


def create_manifest(slug, plugin_dir="."):
	# Default manifest
	manifest = {
		'slug': slug,
	}

	# Try to load existing manifest file
	manifest_filename = os.path.join(plugin_dir, 'plugin.json')
	try:
		with open(manifest_filename, "r") as f:
			manifest = json.load(f)
	except:
		pass

	# Query manifest information
	manifest['name'] = input_default("Plugin name", manifest.get('name', slug))
	manifest['version'] = input_default("Version", manifest.get('version', "2.0.0"))
	manifest['license'] = input_default("License (if open-source, use license identifier from https://spdx.org/licenses/)", manifest.get('license', "proprietary"))
	manifest['brand'] = input_default("Brand (prefix for all module names)", manifest.get('brand', manifest['name']))
	manifest['author'] = input_default("Author", manifest.get('author', ""))
	manifest['authorEmail'] = input_default("Author email (optional)", manifest.get('authorEmail', ""))
	manifest['authorUrl'] = input_default("Author website URL (optional)", manifest.get('authorUrl', ""))
	manifest['pluginUrl'] = input_default("Plugin website URL (optional)", manifest.get('pluginUrl', ""))
	manifest['manualUrl'] = input_default("Manual website URL (optional)", manifest.get('manualUrl', ""))
	manifest['sourceUrl'] = input_default("Source code URL (optional)", manifest.get('sourceUrl', ""))
	manifest['donateUrl'] = input_default("Donate URL (optional)", manifest.get('donateUrl', ""))
	manifest['changelogUrl'] = manifest.get('changelogUrl', "")

	if 'modules' not in manifest:
		manifest['modules'] = []

	# Dump JSON
	with open(manifest_filename, "w") as f:
		json.dump(manifest, f, indent="  ")
	eprint("")
	eprint(f"Manifest written to {manifest_filename}")


def create_module(slug, panel_filename=None, source_filename=None):
	# Check slug
	if not is_valid_slug(slug):
		raise UserException("Slug must only contain ASCII letters, numbers, '-', and '_'.")

	# Read manifest
	manifest_filename = 'plugin.json'
	with open(manifest_filename, "r") as f:
		manifest = json.load(f)

	# Check if module manifest exists
	module_manifest = find(lambda m: m['slug'] == slug, manifest['modules'])
	if module_manifest:
		eprint(f"Module {slug} already exists in plugin.json. Edit this file to modify the module manifest.")

	else:
		# Add module to manifest
		module_manifest = {}
		module_manifest['slug'] = slug
		module_manifest['name'] = input_default("Module name", slug)
		module_manifest['description'] = input_default("One-line description (optional)")
		tags = input_default("Tags (comma-separated, case-insensitive, see https://vcvrack.com/manual/Manifest#modules-tags for list)")
		tags = tags.split(",")
		tags = [tag.strip() for tag in tags]
		if len(tags) == 1 and tags[0] == "":
			tags = []
		module_manifest['tags'] = tags

		manifest['modules'].append(module_manifest)

		# Write manifest
		with open(manifest_filename, "w") as f:
			json.dump(manifest, f, indent="  ")

		eprint(f"Added {slug} to {manifest_filename}")

	# Check filenames
	if panel_filename:
		if not os.path.exists(panel_filename):
			raise UserException(f"Panel not found at {panel_filename}.")

		if source_filename and os.path.exists(source_filename):
			if input_default(f"{source_filename} already exists. Overwrite? (y/n)", "n").lower() != "y":
				return

		# Read SVG XML
		try:
			tree = xml.etree.ElementTree.parse(panel_filename)
		except:
			raise UserException("Invalid SVG")

		components = panel_to_components(tree)

		# Tell user to add model to plugin.hpp and plugin.cpp
		identifier = str_to_identifier(slug)
		eprint(f"""
To enable the module, add

	extern Model* model{identifier};

to plugin.hpp, and add

	p->addModel(model{identifier});

to the init() function in plugin.cpp.""")

		# Write source
		source = components_to_source(components, slug)

		if source_filename:
			with open(source_filename, "w") as f:
				f.write(source)
			eprint(f"Source file generated at {source_filename}")
		else:
			print(source)


def panel_to_components(tree):
	ns = {
		"svg": "http://www.w3.org/2000/svg",
		"inkscape": "http://www.inkscape.org/namespaces/inkscape",
	}

	root = tree.getroot()

	# Get page size
	re_unit = re.compile(r'(-?\d*\.?\d*)\s*([a-zA-Z]*)')
	root_width_match = re_unit.match(root.get('width'))
	root_height_match = re_unit.match(root.get('height'))
	root_width = float(root_width_match[1])
	root_height = float(root_height_match[1])
	# Since we emit mm2px() below, convert pixels to mm
	if root_width_match[2] == 'mm' and root_height_match[2] == 'mm':
		root_scale = 1
	else:
		svg_dpi = 75
		mm_per_in = 25.4
		root_scale = mm_per_in / svg_dpi
	root_width *= root_scale
	root_height *= root_scale

	# Get view box
	view = root.get('viewBox', f"0 0 {root_width} {root_height}")
	view_ary = view.split(' ')
	view_x = float(view_ary[0])
	view_y = float(view_ary[1])
	view_width = float(view_ary[2])
	view_height = float(view_ary[3])

	# Get components layer
	group = root.find(".//svg:g[@inkscape:label='components']", ns)
	# Illustrator uses `data-name` (in Unique object ID mode) or `id` (in Layer Names object ID mode) for the group name.
	# Don't test with `not group` since Elements with no subelements are falsy.
	if group is None:
		group = root.find(".//svg:g[@data-name='components']", ns)
	if group is None:
		group = root.find(".//svg:g[@id='components']", ns)
	if group is None:
		raise UserException("Could not find \"components\" layer on panel")

	components = {}
	components['params'] = []
	components['inputs'] = []
	components['outputs'] = []
	components['lights'] = []
	components['widgets'] = []

	for el in group:
		c = {}

		# Get name
		name = el.get('{' + ns['inkscape'] + '}label')
		# Illustrator names
		if not name:
			name = el.get('data-name')
		if not name:
			name = el.get('id')
		if not name:
			name = ""
		# Split name and component class name
		names = name.split('#', 1)
		name = names[0]
		if len(names) >= 2:
			c['cls'] = names[1]
		name = str_to_identifier(name).upper()
		c['name'] = name

		# Get position
		if el.tag == '{' + ns['svg'] + '}rect':
			x = (float(el.get('x')) - view_x) / view_width * root_width
			y = (float(el.get('y')) - view_y) / view_height * root_height
			width = (float(el.get('width')) - view_x) / view_width * root_width
			height = (float(el.get('height')) - view_y) / view_height * root_height
			c['x'] = round(x, 3)
			c['y'] = round(y, 3)
			c['width'] = round(width, 3)
			c['height'] = round(height, 3)
			c['cx'] = round(x + width / 2, 3)
			c['cy'] = round(y + height / 2, 3)
		elif el.tag == '{' + ns['svg'] + '}circle' or el.tag == '{' + ns['svg'] + '}ellipse':
			cx = (float(el.get('cx')) - view_x) / view_width * root_width
			cy = (float(el.get('cy')) - view_y) / view_height * root_height
			c['cx'] = round(cx, 3)
			c['cy'] = round(cy, 3)
		else:
			eprint(f"Element in components layer is not rect, circle, or ellipse: {el}")
			continue

		# Get color
		color = None
		# Get color from fill attribute
		fill = el.get('fill')
		if fill:
			color = fill
		# Get color from CSS fill style
		if not color:
			style = el.get('style')
			if style:
				color_match = re.search(r'fill:\S*(#[0-9a-fA-F]{6})', style)
				color = color_match.group(1)
		if not color:
			eprint(f"Cannot get color of component: {el}")
			continue

		color = color.lower()

		if color == '#ff0000' or color == '#f00' or color == 'red':
			components['params'].append(c)
		if color == '#00ff00' or color == '#0f0' or color == 'lime':
			components['inputs'].append(c)
		if color == '#0000ff' or color == '#00f' or color == 'blue':
			components['outputs'].append(c)
		if color == '#ff00ff' or color == '#f0f' or color == 'magenta':
			components['lights'].append(c)
		if color == '#ffff00' or color == '#ff0' or color == 'yellow':
			components['widgets'].append(c)

	# Sort components
	top_left_sort = lambda w: w['cy'] + 0.01 * w['cx']
	components['params'] = sorted(components['params'], key=top_left_sort)
	components['inputs'] = sorted(components['inputs'], key=top_left_sort)
	components['outputs'] = sorted(components['outputs'], key=top_left_sort)
	components['lights'] = sorted(components['lights'], key=top_left_sort)
	components['widgets'] = sorted(components['widgets'], key=top_left_sort)

	eprint(f"Found {len(components['params'])} params, {len(components['inputs'])} inputs, {len(components['outputs'])} outputs, {len(components['lights'])} lights, and {len(components['widgets'])} custom widgets in \"components\" layer.")
	return components


def components_to_source(components, slug):
	identifier = str_to_identifier(slug)
	source = ""

	source += f"""#include "plugin.hpp"


struct {identifier} : Module {{"""

	# Params
	source += """
	enum ParamId {"""
	for c in components['params']:
		source += f"""
		{c['name']}_PARAM,"""
	source += """
		PARAMS_LEN
	};"""

	# Inputs
	source += """
	enum InputId {"""
	for c in components['inputs']:
		source += f"""
		{c['name']}_INPUT,"""
	source += """
		INPUTS_LEN
	};"""

	# Outputs
	source += """
	enum OutputId {"""
	for c in components['outputs']:
		source += f"""
		{c['name']}_OUTPUT,"""
	source += """
		OUTPUTS_LEN
	};"""

	# Lights
	source += """
	enum LightId {"""
	for c in components['lights']:
		source += f"""
		{c['name']}_LIGHT,"""
	source += """
		LIGHTS_LEN
	};"""


	source += f"""

	{identifier}() {{
		config(PARAMS_LEN, INPUTS_LEN, OUTPUTS_LEN, LIGHTS_LEN);"""

	for c in components['params']:
		source += f"""
		configParam({c['name']}_PARAM, 0.f, 1.f, 0.f, "");"""

	for c in components['inputs']:
		source += f"""
		configInput({c['name']}_INPUT, "");"""

	for c in components['outputs']:
		source += f"""
		configOutput({c['name']}_OUTPUT, "");"""

	source += """
	}

	void process(const ProcessArgs& args) override {
	}
};"""

	source += f"""


struct {identifier}Widget : ModuleWidget {{
	{identifier}Widget({identifier}* module) {{
		setModule(module);
		setPanel(createPanel(asset::plugin(pluginInstance, "res/{slug}.svg")));

		addChild(createWidget<ScrewSilver>(Vec(RACK_GRID_WIDTH, 0)));
		addChild(createWidget<ScrewSilver>(Vec(box.size.x - 2 * RACK_GRID_WIDTH, 0)));
		addChild(createWidget<ScrewSilver>(Vec(RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));
		addChild(createWidget<ScrewSilver>(Vec(box.size.x - 2 * RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));"""


	# Params
	if len(components['params']) > 0:
		source += "\n"
	for c in components['params']:
		if 'x' in c:
			source += f"""
		addParam(createParam<{c.get('cls', 'RoundBlackKnob')}>(mm2px(Vec({c['x']}, {c['y']})), module, {identifier}::{c['name']}_PARAM));"""
		else:
			source += f"""
		addParam(createParamCentered<{c.get('cls', 'RoundBlackKnob')}>(mm2px(Vec({c['cx']}, {c['cy']})), module, {identifier}::{c['name']}_PARAM));"""

	# Inputs
	if len(components['inputs']) > 0:
		source += "\n"
	for c in components['inputs']:
		if 'x' in c:
			source += f"""
		addInput(createInput<{c.get('cls', 'PJ301MPort')}>(mm2px(Vec({c['x']}, {c['y']})), module, {identifier}::{c['name']}_INPUT));"""
		else:
			source += f"""
		addInput(createInputCentered<{c.get('cls', 'PJ301MPort')}>(mm2px(Vec({c['cx']}, {c['cy']})), module, {identifier}::{c['name']}_INPUT));"""

	# Outputs
	if len(components['outputs']) > 0:
		source += "\n"
	for c in components['outputs']:
		if 'x' in c:
			source += f"""
		addOutput(createOutput<{c.get('cls', 'PJ301MPort')}>(mm2px(Vec({c['x']}, {c['y']})), module, {identifier}::{c['name']}_OUTPUT));"""
		else:
			source += f"""
		addOutput(createOutputCentered<{c.get('cls', 'PJ301MPort')}>(mm2px(Vec({c['cx']}, {c['cy']})), module, {identifier}::{c['name']}_OUTPUT));"""

	# Lights
	if len(components['lights']) > 0:
		source += "\n"
	for c in components['lights']:
		if 'x' in c:
			source += f"""
		addChild(createLight<{c.get('cls', 'MediumLight<RedLight>')}>(mm2px(Vec({c['x']}, {c['y']})), module, {identifier}::{c['name']}_LIGHT));"""
		else:
			source += f"""
		addChild(createLightCentered<{c.get('cls', 'MediumLight<RedLight>')}>(mm2px(Vec({c['cx']}, {c['cy']})), module, {identifier}::{c['name']}_LIGHT));"""

	# Widgets
	if len(components['widgets']) > 0:
		source += "\n"
	for c in components['widgets']:
		if 'x' in c:
			source += f"""
		// mm2px(Vec({c['width']}, {c['height']}))
		addChild(createWidget<{c.get('cls', 'Widget')}>(mm2px(Vec({c['x']}, {c['y']}))));"""
		else:
			source += f"""
		addChild(createWidgetCentered<{c.get('cls', 'Widget')}>(mm2px(Vec({c['cx']}, {c['cy']}))));"""

	source += f"""
	}}
}};


Model* model{identifier} = createModel<{identifier}, {identifier}Widget>("{slug}");"""

	return source


def usage(script):
	text = f"""VCV Rack Plugin Development Helper

Usage: {script} <command> ...
Commands:

createplugin <slug> [plugin dir]

	A directory will be created and initialized with a minimal plugin template.
	If no plugin directory is given, the slug is used.

createmanifest <slug> [plugin dir]

	Creates a `plugin.json` manifest file in an existing plugin directory.
	If no plugin directory is given, the current directory is used.

createmodule <module slug> [panel file] [source file]

	Adds a new module to the plugin manifest in the current directory.
	If a panel and source file are given, generates a template source file initialized with components from a panel file.
	Example:
		{script} createmodule MyModule res/MyModule.svg src/MyModule.cpp

	See https://vcvrack.com/manual/PanelTutorial.html for creating SVG panel files.
"""
	eprint(text)


def parse_args(args):
	script = args.pop(0)
	if len(args) == 0:
		usage(script)
		return

	cmd = args.pop(0)
	if cmd == 'createplugin':
		create_plugin(*args)
	elif cmd == 'createmodule':
		create_module(*args)
	elif cmd == 'createmanifest':
		create_manifest(*args)
	else:
		eprint(f"Command not found: {cmd}")


if __name__ == "__main__":
	try:
		parse_args(sys.argv)
	except KeyboardInterrupt:
		pass
	except UserException as e:
		eprint(e)
		sys.exit(1)