groff -man -Tascii GNUstep.7
GNUstep is written in Objective-C, an object-oriented superset of the C programming language, similar to SmallTalk. However there exist a number of bridges and interfaces to develop GNUstep programs using other languages like JAVA or Ruby. The GNUstep core system consists of the following parts, which are jointly referred to as gnustep-core :
gnustep-make A set of scripts and makefiles that heavily ease the creation and maintenance of software projects.
gnustep-base The FoundationKit libraries for non-GUI tools providing everything from string and array classes, filemanager classes to distributed objects.
gnustep-gui The ApplicationKit containing widgets, workspace classes and means for applications to interact with the user. This is the frontend of GNUstep's GUI part.
gnustep-back This is the backend of GNUstep 's GUI part which does the actual rendering and event handling. It acts as a layer between gnustep-gui and the operating/drawing system. Backends exist for X11 (one using cairo, one using libart, one using xlib drawing) and win32.
Apart from the above, there exist a number of addon libraries related to GNUstep, like Renaissance which allows developers to specify an application's user interface in xml. For database access, there is GDL2 - the GNUstep Database Library. Please refer to the GNUstep website for more information.
GNUstep per default is self-contained. That means that all GNUstep applications, tools, libraries and add-ons are installed into the GNUstep directory hierarchy. However as of gnustep-make-2.0.0 it is also possible to install everything in compliance with other filesystem hierarchies. See the FilesystemLayouts directory in the source package of gnustep-make for more information.
There are four domains which are searched for files: the System domain, which should only contain the core system files, the Local domain which stores all that has later been installed on the system, the Network domain which should be used for importing data from a remote system, and the User domain which resides in the user's home directory (mostly ~/GNUstep ).
A complete description of the default GNUstep layout can be found in the filesystem.pdf .
The make_services tool makes sure the services are known to other applications when a application is newly installed.
A loadable bundle is a kind of plug-in. There are two types of loadable bundles, namely plug-ins and palettes. The plug-in is normally referred to as a bundle, which can make it a bit confusing. A plug-in is a bundle that can be loaded by an application to provide additional functionality, while a palette is a plug-in for GORM , the interface builder. A palette is used to extend GORM with custom UI objects. Palettes have a .palette extension.
The central place of the user interface is the Workspace or Workspace Manager which acts as an interface between the user and parts of the system like files, processes, etc. The GWorkspace application provides this functionality in GNUstep. See the GWorkspace website for more details.
What would a development environment be without the applications to create applications? The applications provided by GNUstep for Rapid Application Development are:
GORM GORM is the interface modeler. With GORM you can quickly create the graphical interface of your application.
Project Center Project Center is the program where you can develop your program. It offers you automatic generation of GNUmakefiles , project maintenance and of course a code editor.
GNUstep Websites:
http://www.gnustep.org/ Official GNUstep website
http://wiki.gnustep.org/ GNUstep Wiki (lots of useful information)
http://savannah.gnu.org/projects/gnustep/ GNUstep Project Page
http://gnustep.made-it.com/ GNUstep Documentation Library
http://www.collaboration-world.com Collaboration World, the home of GNUmail
http://www.gnustep.it/ The home of GWorkspace, JIGS, Renaissance and programming tutorials.
Mailinglists
http://www.gnustep.org/information/gethelp.html Mailing lists and mailing list archives.
IRC
#GNUstep on FreeNode You are invited to join the #GNUstep IRC channel on FreeNode (irc.freenode.net).
GNUstep is developed and maintained by a large number of people. Please see <http://www.gnustep.org/developers/whoiswho.html> for a list.
In December 2007 it was expanded by Dennis Leeuw <dleeuw@made-it.com> and made to comply with the gnustep-make-2.0.x releases.