The Gendl® gendl Subsystem
There are some convenience scripts in this repository which can help you use this image:
Install Gnu emacs on your host if it's not already.
In Emacs, do
M-x load-file [Enter]and specify
gendl/emacs/gdl.elto be loaded. This should set up your emacs with Slime (needed to connect to the Gendl swank listener coming in the next step). (if you already have Slime loaded into your emacs environment, then this step may not be needed).
gendl/docker/runscript in this repository. This will spin up a pre-built Gendl image based on CCL (Clozure CL), with Swank listening on port 4200 mapped to port 4200 on your docker host. At this point, you can do
M-x slime-connectand connect to
4200, and you'll be connected and ready to start developing with Gendl!
Gendl® is a Generative Programming and Knowledge Based Engineering framework, implementing concepts which date back to the 1980s and which cutting-edge companies have been quietly using to gain competitive advantage with mission-critical engineering applications. These concepts required hundreds of thousands of dollars investment in hardware and software just a couple decades ago. They are now at your fingertips as an integral part of the Open-Source ecosystem, running on commodity consumer-grade hardware.
Gendl allows for high-level declarative, object-oriented problem
solving and application development, including but not limited to the
ability to generate and manipulate 3D geometry. To solve a problem in
Gendl, you formulate it using the
define-object operator, which
allows you to specify inputs, outputs (
computed-slots), and child
objects, which then gives the ability to generate a "tree" of objects,
useful for decomposing complexity.
A graphical web-based interface, geysr, is available for interacting with your system as it is developed.
The web-based GUI framework used to make geysr (GWL) is also available for creating your own custom web-based user interfaces.
Fundamental KBE Features Provided
- Declarative (non-procedural) Syntax
- Object and value caching (i.e. runtime memorization)
- Dependency-tracking (cached values get recomputed when needed)
Gendl ships with a full set of wireframe 3D and 2D geometry primitives along with output lenses for standard browser-based viewing and exchange formats such as PDF, SVG, X3D, PNG, as well as DXF.
Optionally there is available a set of surface- and solid-modeling primitives which currently depend on SMLib, a commercial geometry kernel available from Solid Modeling Solutions, Inc. SMLib enables the use of standard CAD data exchange formats such as Iges, STEP, and STL (for 3D printing).
Common Lisp: Allegro CL, LispWorks, CCL (Clozure CL), or SBCL. Without web interface, initial ports to ECL, ABCL, and CLISP have also been completed.
Quicklisp (available from http://www.quicklisp.org)
Gnu Emacs (recommended Editor/IDE -- native CL Editor/IDEs can also be used)
Curiosity, Creativity, and Courage
To load the entire system, you can do it with:
(ql:quickload :gendl) (gendl:start-gendl!)
Now you can do a quick sanity check by visiting:
in your browser and trying to instantiate the default assembly tree (robot) with File -> New [robot:assembly].
Emacs Editor/IDE Support
Slime (Superior Lisp Interaction Mode for Emacs) is recommended for developing Gendl applications with Emacs.
Slime is available by doing
M-x load-file [ret] in emacs, and
selecting the file
`Glime' is our Gendl-specific customizations to Slime (still experimental). This is implemented both on the swank (Common Lisp) side of things, and on the slime (emacs) side of things, and can be loaded with
(load (compile-file ".../gendl/emacs/glime.lisp"))
in CL, and
M-x load-file [Ret] .../gendl/emacs/glime.el
on the emacs side.
Although not strictly necessary, the file
also provided and can be used as a starting point or reference for
loading Glime and Gendl into an emacs environment.
Also, more detail on operating the emacs environment can be found
Further documentation is published here.
- #gendl on libera.chat
- @gendl and @genworks on Twitter
- (common-lisp.net mailing list hopefully/possibly coming soon)
- Genworks Google Group(mostly archival)
- #commonlisp, #common-lisp.net channels on libera.chat
- Genworks would like to begin hosting free Gendl/GDL training seminars in Metro Detroit and possibly other locations. Please contact Genworks if you are interested in being notified of any upcoming seminars.
Gendl source code Architecture:
Gendl is separated into layered components, some of which depend on others. Some components also depend on third-party external libraries, which are currently handled with the Quicklisp system.
At the core "kernel" is the
implemented with files in the folder
gendl/base/. This includes the
define-object and related macros as well as
core primitives such as
Including the base, there are eight modules supported with Gendl:
:base- (gendl/base/) Gendl language kernel for compiling declarative object definitions and working with them at runtime.
:cl-lite- (gendl/cl-lite/) For compiling and loading directory trees as projects. This can also generate ASDF files, and supplements the standard use of asdf and quicklisp.
:geom-base- (gendl/geom-base/) Built-in Gendl 3D and 2D wireframe primitives and cartesian coordinate system for basic geometry generation and manipulation.
:gwl- (gendl/gwl/) Generative Web Language, for representing web pages using GDL objects, includes Ajax-based web interaction with your model.
:gwl-graphics- (gendl/gwl-graphics/) for including graphics rendered from geometry object in GWL web pages.
:surf- (gendl/surf/) NURBS surface and brep/boolean solids primitives (these don't do much without the underlying geometry kernel middleware or implementation).
:geysr- (gendl/apps/geysr/) web-based testing, tracking, and debugging utility.
:yadd- (gendl/apps/yadd/) for self auto-documentation.
:regression- (gdl/regression) regression test utilities and tests.
Alternative Geometry Kernels
If you have a different favorite solid modeling kernel, then an interesting project would be to interface the existing Surface package to that kernel, by implementing the methods in surf/source/methods.lisp.
The Surface (
:surf) package (in the
surf/ folder) contains all the
high-level Surface and Solid modeling primitives currently implemented
in Gendl. These primitives provide a protocol for what the objects
should be able to do (i.e. what messages they should answer), but
without the SMLib library and associated middleware available, they
will not be able to return any results. The SMLib kernel and
associated middleware are available as part of the commercial
Genworks® GDL product from Genworks®
The AGPL, has the requirement that you release any derivatives and any applications compiled with Gendl under AGPL-compatible license (if distributed at all).
For Proprietary (closed-source) development and distribution, the commercial Genworks® GDL system (including Gendl® technology and, optionally, commercial CL engines, technical support, and commercial solid modeling engine) is available from Genworks.
Genworks may offer AGPL license exception credits or other incentives as consideration for code contributions (e.g. bugfixes, ports) made via gitlab merge requests, under the terms of our Contributor's Agreement. Please contact Genworks for details.