docs: clean up & improve readme

docs: move section from readme to todo

docs: change proejct description
Signed-off-by: Christopher Arndt <chris@chrisarndt.de>

LICENSE.md

@@ -1,4 +1,4 @@
-MIT License
+# MIT License
 
 Copyright (c) 2022 - 2023 Christopher Arndt <info@chrisarndt.de>
 

README.md

@@ -1,23 +1,17 @@
 # jacket
 
-A [Nim] wrapper for the [JACK] [C API]
+A [Nim] wrapper for the [JACK] client side [C API] aka *libjack*.
 
 
 ## Project status
 
-This software is in *alpha status* and has no official release yet.
+This software is in *beta status*.
 
 The majority of JACK client APIs have been wrapped and are functional (see
 [examples]), but some APIs (e.g. threading) still need wrapping. Others, like
 the server control or the deprecated session API, will probably not be covered
-by these bindings. While this project is in alpha or beta stage, symbol names
-may still be changed and things moved around before the first public release.
-
-Also, I plan to add a higher-level abstraction on top of the direct mapping
-from Nim procs and types to C functions and types, probably in the form of
-a JACK client object, which takes care of creating a JACK client instance,
-registering ports and setting up all the callbacks necessary for a well-behaved
-JACK application.
+by these bindings. While this project is in beta stage, symbol names may still
+be changed and things moved around before the first public release.
 
 
 ## Installation
@@ -25,18 +19,90 @@ JACK application.
 * Clone this repository.
 * Change into the `jacket` directory.
 * Run [`nimble install`] (or `nimble develop`).
-* Run the examples with `nim compile --run examples/<example>.nim` (some also
-  need `--threads:on`).
+* Run the [examples] with `nim compile --run examples/<example>.nim`.
+
+   (Some examples need `--threads:on` with Nim < 2.0).
+
+
+## Usage
+
+Here is a very minimal JACK client application, which just passes audio through
+from its single input port to its output port.
+
+Any error checking and handling has been omitted for brevity's sake. See the
+files in the [examples] directory for more robust example code.
+
+```nim
+import std/os
+import system/ansi_c
+import jacket
+
+var
+    jackClient: ClientP
+    status: cint
+    exitSignalled: bool = false
+    inpPort, outPort: PortP
+type JackBufferP = ptr UncheckedArray[DefaultAudioSample]
+
+proc signalCb(sig: cint) {.noconv.} =
+    exitSignalled = true
+
+proc shutdownCb(arg: pointer = nil) {.cdecl.} =
+    exitSignalled = true
+
+proc processCb(nFrames: NFrames, arg: pointer): cint {.cdecl.} =
+    var inpbuf = cast[JackBufferP](portGetBuffer(inpPort, nFrames))
+    var outbuf = cast[JackBufferP](portGetBuffer(outPort, nFrames))
+    # copy samples from input to output buffer
+    for i in 0 ..< nFrames:
+        outbuf[i] = inpbuf[i]
+
+# Create JACK Client ptr
+jackClient = clientOpen("passthru", NullOption.ord, status.addr)
+# Register audio input and output ports
+inpPort = jackClient.portRegister("in_1", JACK_DEFAULT_AUDIO_TYPE, PortIsInput.ord, 0)
+outPort = jackClient.portRegister("out_1", JACK_DEFAULT_AUDIO_TYPE, PortIsOutput.ord, 0)
+# Set JACK callbacks
+jackClient.onShutdown(shutdownCb)
+discard jackClient.setProcessCallback(processCb, nil)
+# Handle POSIX signals
+c_signal(SIGINT, signalCb)
+c_signal(SIGTERM, signalCb)
+# Activate JACK client ...
+discard jackClient.activate()
+
+while not exitSignalled:
+    sleep(50)
+
+discard jackClient.clientClose()
+```
 
 
 ## License
 
-This software is released under the *MIT License*. See the [LICENSE](./LICENSE)
-file for more information.
+This software is released under the *MIT License*. See the file
+[LICENSE.md](./LICENSE.md) for more information.
+
+Please note that the JACK client library (libjack), which this project wraps,
+is licensed under the [LGPL-2.1]. This wrapper does not statically or
+dynamically link to libjack, but only loads it via the dynamic linker at
+run-time.
+
+Software using this wrapper is, in the opinion of its author, not considered a
+derivative work of libjack and not required to be released under the LGPL, but
+no guarantees are made in this regard and users are advised to employ
+professional legal counsel when in doubt.
+
+
+## Author
+
+*jacket* is written by [Christopher Arndt].
 
 
-[`nimble install`]: https://github.com/nim-lang/nimble#nimble-usage
 [C API]: https://jackaudio.org/api/
+[Christopher Arndt]: mailto:info@chrisarndt.de
 [examples]: ./examples
 [JACK]: https://jackaudio.org/
+[LGPL-2.1]: https://spdx.org/licenses/LGPL-2.1-or-later.html
+[`nimble install`]: https://github.com/nim-lang/nimble#nimble-usage
 [Nim]: https://nim-lang.org/

TODO.md

@@ -1,14 +1,24 @@
 # TODO
 
+
 ## Threading API
 
 Still needs to be wrapped. How to handle `jack_native_thread_t` type?
 
+
 ## Internal Clients
 
 Jack 1 and JACK 2 are disagreeing on the signatures of the functions for
-loading and getting a handles for internal clients:
+loading and getting a handle for internal clients:
 
 * https://github.com/jackaudio/jack2/blob/develop/common/jack/intclient.h#L66
 * https://github.com/jackaudio/headers/blob/2bfa5069718ca4f4dc091e0be845958f2d8a5ba8/intclient.h#L69
 * https://jackaudio.org/api/intclient_8h.html#a176a2daf66c8777eb1a845068fd7a822
+
+
+## Higher level abstraction
+
+Add a higher-level abstraction on top of the direct mapping from Nim procs and
+types to C functions and types, in the form of a JACK client object, which
+takes care of creating a JACK client instance, registering ports and setting up
+all the callbacks necessary for a well-behaved JACK application.

jacket.nimble

@@ -2,7 +2,7 @@
 
 version       = "0.1.0"
 author        = "Christopher Arndt"
-description   = "A Nim wrapper for the JACK C API"
+description   = "A Nim wrapper for the JACK client-side C API aka libjack"
 license       = "MIT"
 
 srcDir = "src"