luci/documentation/Modules.md

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# Categories
The LuCI modules are divided into several category directories, namely:
* applications (Single applications or plugins for other modules or applications)
* i18n (Translation files)
* libs (Independent libraries)
* modules (Collections of applications)
* themes (Frontend themes)
Each module goes into a subdirectory of any of this category-directories.
# Module directory
The contents of a module directory are as follows:
## Makefile
This is the module's makefile. If the module just contains Lua sourcecode or resources then the following Makefile should suffice.
include ../../build/config.mk
include ../../build/module.mk
If you have C(++) code in your module your Makefile should at least contain the following things.
include ../../build/config.mk
include ../../build/gccconfig.mk
include ../../build/module.mk
compile:
# Commands to compile and link your C-code
# and to install them under the dist/ hierarchy
clean: luaclean
# Commands to clean your compiled objects
## src
The *src* directory is reserved for C sourcecode.
## luasrc
*luasrc* contains all Lua sourcecode files. These will automatically be stripped or compiled depending on the Make target and are installed in the LuCI installation directory.
## lua
*lua* is equivalent to _luasrc_ but containing Lua files will be installed in the Lua document root.
## htdocs
All files under *htdocs* will be copied to the document root of the target webserver.
## root
All directories and files under *root* will be copied to the installation target as they are.
## dist
*dist* is reserved for the builder to create a working installation tree that will represent the filesystem on the target machine.
*DO NOT* put any files there as they will get deleted.
## ipkg
*ipkg* contains IPKG package control files, like _preinst'', ''posinst'', ''prerm'', ''postrm''. ''conffiles_.
See IPKG documentation for details.
# OpenWRT feed integration
If you want to add your module to the LuCI OpenWRT feed you have to add several sections to the contrib/package/luci/Makefile.
For a Web UI applications this is:
A package description:
define Package/luci-app-YOURMODULE
$(call Package/luci/webtemplate)
DEPENDS+=+some-package +some-other-package
TITLE:=SHORT DESCRIPTION OF YOURMODULE
endef
A package installation target:
define Package/luci-app-YOURMODULE/install
$(call Package/luci/install/template,$(1),applications/YOURMODULE)
endef
A module build instruction:
ifneq ($(CONFIG_PACKAGE_luci-app-YOURMODULE),)
PKG_SELECTED_MODULES+=applications/YOURMODULE
endif
A build package call:
$(eval $(call BuildPackage,luci-app-YOURMODULE))