initial commmit with working shared lib build for Node with N API

.editorconfig

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+root = true
+
+[*.cr]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true

.gitignore

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+/docs/
+/lib/
+/bin/
+/build
+/.shards/
+*.dwarf
+
+# Libraries don't need dependency lock
+# Dependencies will be locked in applications that use them
+/shard.lock

.travis.yml

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+language: crystal

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2019 Jens Berlips
+
+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 without limitation the rights
+to use, copy, modify, merge, publish, 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 NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

Makefile

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+.POSIX:
+
+CRYSTAL = /usr/local/bin/crystal
+CRYSTAL_SRC = /usr/local/Cellar/crystal/0.27.2/src/
+CRYSTAL_LIB = /opt/brew/lib
+CRFLAGS = --release
+
+CFLAGS := \
+	'-DNODE_GYP_MODULE_NAME=binding' \
+	'-DUSING_UV_SHARED=1' \
+	'-DUSING_V8_SHARED=1' \
+	'-DV8_DEPRECATION_WARNINGS=1' \
+	'-D_DARWIN_USE_64_BIT_INODE=1' \
+	'-D_LARGEFILE_SOURCE' \
+	'-D_FILE_OFFSET_BITS=64' \
+	'-DBUILDING_NODE_EXTENSION' \
+	-Os \
+	-gdwarf-2 \
+	-mmacosx-version-min=10.7 \
+	-arch x86_64 \
+	-Wall \
+	-Wendif-labels \
+	-W \
+	-Wno-unused-parameter \
+	-fno-strict-aliasing \
+	-MMD
+
+CCFLAGS := \
+	-shared \
+	-undefined \
+	dynamic_lookup \
+	-Wl,-no_pie \
+	-Wl,-search_paths_first \
+	-mmacosx-version-min=10.7 \
+	-arch x86_64 \
+	-stdlib=libc++ \
+	-init _crystal_library_init
+
+
+
+INCS := \
+	-I$(HOME)/.node-gyp/11.14.0/include/node \
+	-I$(HOME)/.node-gyp/11.14.0/src \
+	-I$(HOME)/.node-gyp/11.14.0/deps/openssl/config \
+	-I$(HOME)/.node-gyp/11.14.0/deps/openssl/openssl/include \
+	-I$(HOME)/.node-gyp/11.14.0/deps/uv/include \
+	-I$(HOME)/.node-gyp/11.14.0/deps/zlib \
+	-I$(HOME)/.node-gyp/11.14.0/deps/v8/include
+
+PRELUDE=./crystal/prelude.cr
+CRYSTAL_PATH = src:$(CRYSTAL_SRC)
+LIBS = $(CRYSTAL_SRC)/ext/libcrystal.a -lgc -ldl -levent -lpcre -lpthread -liconv -ljack
+LDFLAGS =  $(LIBS)
+
+run: clean libjack2.o
+	c++ $(CCFLAGS) -o build/libjack2.node build/libjack2.o $(LDFLAGS)
+	node js/index.js
+
+libjack2.o:
+	$(CRYSTAL) build $(CRFLAGS) --cross-compile --prelude $(PRELUDE) -o build/libjack2 src/libjack2.cr
+
+clean: phony
+	rm -f libjack2.o *_test bc_flags
+
+phony:

README.md

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+# jack2cr
+
+TODO: Write a description here
+
+## Installation
+
+1. Add the dependency to your `shard.yml`:
+
+   ```yaml
+   dependencies:
+     jack2cr:
+       github: your-github-user/jack2cr
+   ```
+
+2. Run `shards install`
+
+## Usage
+
+```crystal
+require "jack2cr"
+```
+
+TODO: Write usage instructions here
+
+## Development
+
+```bin/c2cr -I/usr/local/include/jack jack.h```
+
+TODO: Write development instructions here
+
+## Contributing
+
+1. Fork it (<https://github.com/your-github-user/jack2cr/fork>)
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create a new Pull Request
+
+## Contributors
+
+- [Jens](https://github.com/your-github-user) - creator and maintainer

js/index.js

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+//const addon = require('./test.node');
+const addon = require('../build/libjack2.node');
+
+addon.hello();

shard.yml

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+name: jack2js
+version: 0.1.0
+
+authors:
+  - Jens Berlips <[email protected]>
+
+crystal: 0.27.2
+
+license: MIT

spec/jack2cr_spec.cr

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+require "./spec_helper"
+
+describe Jack2 do
+  # TODO: Write tests
+
+  it "works" do
+    client = Jack2::Client.new
+    client.register_port("out", Jack2::Client::PORT_OUTPUT)
+    puts client.ports
+  end
+end

spec/spec_helper.cr

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+require "spec"
+require "../src/jack2"

src/crystal/main.cr

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+# @[Link(ldflags: "-")]
+require "../libnode"
+
+lib LibCrystalMain
+  @[Raises]
+  fun __crystal_main(argc : Int32, argv : UInt8**)
+end
+
+module Crystal
+  @@stdin_is_blocking = false
+  @@stdout_is_blocking = false
+  @@stderr_is_blocking = false
+
+  def self.main(&block)
+    puts "GC init"
+    GC.init
+
+    remember_blocking_state
+
+    status =
+      begin
+        yield
+        0
+      rescue ex
+        1
+      end
+
+    AtExitHandlers.run status
+    ex.inspect_with_backtrace STDERR if ex
+    STDOUT.flush
+    STDERR.flush
+
+    restore_blocking_state
+
+    status
+  end
+
+  def self.main(argc : Int32, argv : UInt8**)
+    main do
+      main_user_code(argc, argv)
+    end
+  end
+
+  def self.main_user_code(argc : Int32, argv : UInt8**)
+    LibCrystalMain.__crystal_main(argc, argv)
+  end
+
+  def self.remember_blocking_state
+    @@stdin_is_blocking = IO::FileDescriptor.fcntl(0, LibC::F_GETFL) & LibC::O_NONBLOCK == 0
+    @@stdout_is_blocking = IO::FileDescriptor.fcntl(1, LibC::F_GETFL) & LibC::O_NONBLOCK == 0
+    @@stderr_is_blocking = IO::FileDescriptor.fcntl(2, LibC::F_GETFL) & LibC::O_NONBLOCK == 0
+  end
+
+  def self.restore_blocking_state
+    STDIN.blocking = @@stdin_is_blocking
+    STDOUT.blocking = @@stdout_is_blocking
+    STDERR.blocking = @@stderr_is_blocking
+  end
+end
+
+# Dynamic lib on load function here
+# specified in Makefile under
+fun crystal_library_init(argc : Int32, argv : UInt8**) : Int32
+  Crystal.main(argc, argv)
+  Node::Jack2.setup
+  0
+end
+# fun main = crystal_library_init(argc : Int32, argv : UInt8**) : Int32
+#  puts "INIT2 "
+#  Crystal.main(argc, argv)
+# end

src/crystal/prelude.cr

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+# Entries to this file should only be ordered if macros are involved -
+# macros need to be defined before they are used.
+# A first compiler pass gathers all classes and methods, removing the
+# requirement to place these in load order.
+#
+# When adding new files, use alpha-sort when possible. Make sure
+# to also add them to `docs_main.cr` if their content need to
+# appear in the API docs.
+
+private macro no_win(stmt)
+  {% unless flag?(:win32) %}
+    {{stmt}}
+  {% end %}
+end
+
+# This list requires ordered statements
+require "lib_c"
+
+require "macros"
+require "object"
+require "comparable"
+{% if flag?(:win32) %}
+  require "windows_stubs"
+{% end %}
+require "exception"
+require "iterable"
+require "iterator"
+require "indexable"
+require "string"
+
+# Alpha-sorted list
+# require "annotations"
+require "array"
+require "atomic"
+require "bool"
+require "box"
+require "char"
+require "char/reader"
+require "class"
+no_win require "concurrent"
+require "./main"
+require "deque"
+require "dir"
+require "enum"
+require "enumerable"
+require "env"
+require "errno"
+require "ext"
+require "file"
+require "float"
+require "gc"
+require "hash"
+no_win require "iconv"
+require "int"
+require "intrinsics"
+require "io"
+require "kernel"
+require "math/math"
+no_win require "mutex"
+require "named_tuple"
+require "nil"
+require "number"
+# require "humanize"
+# require "path"
+require "pointer"
+require "pretty_print"
+require "primitives"
+require "proc"
+no_win require "process"
+require "raise"
+require "random"
+require "range"
+require "reference"
+require "reflect"
+require "regex"
+require "set"
+no_win require "signal"
+require "slice"
+require "static_array"
+require "struct"
+require "symbol"
+no_win require "system"
+no_win require "thread"
+require "time"
+require "tuple"
+require "unicode"
+require "union"
+require "va_list"
+require "value"

src/libjack2.cr

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+require "./tools"
+require "./libjack2_c"
+
+module Jack2
+  VERSION = "0.1.0"
+
+  class Client
+    PORT_OUTPUT = Jack2_c::JackPortFlags::JackPortIsOutput
+
+    def initialize
+      status = Jack2_c::JackStatus::JackFailure
+      @client = Jack2_c.jack_client_open("testclient", Jack2_c::JackOptions::JackNullOption, pointerof(status)) ||
+                raise "could not create client"
+      r = Jack2_c.jack_activate(@client)
+      raise "could not activate: #{r}" if r != 0
+    end
+
+    def finalize
+      Jack2_c.jack_client_close(@client) if @client
+    end
+
+    def register_port(name, port_type = PORT_OUTPUT)
+      Jack2_c.jack_port_register(@client, name,
+        Jack2_c::JACK_DEFAULT_AUDIO_TYPE,
+        port_type,
+        0) || raise "could not register port"
+    end
+
+    def client_name
+      String.new(Jack2_c.jack_get_client_name(@client))
+    end
+
+    def ports
+      ports_c = Jack2_c.jack_get_ports(@client, "", "", 0)
+      ports = ports_c.map_ptr_not_null { |a| String.new(a) }
+      Jack2_c.jack_free(ports_c)
+      ports
+    end
+  end
+end