Add html datasources

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	<div class='klayout-generated-doc'><p class="navigator"><b>KLayout Documentation (Qt 5): </b><a href="../index.html">Main Index</a> » <a href="index.html">Various Topics</a> » About Packages</p><h1>About Packages</h1><a name="k_1"></a><a name="k_2"></a><a name="k_3"></a><p>
	"Salt" is KLayout's package manager which allows selecting and installing packages from a global repository.
	Packages make KLayout more tasty. Packages (the "grains") may cover a variety of features:
	</p><ul><li>Ruby or Python macros</li><li>DRC runsets</li><li>Technologies</li><li>Fonts for the Basic.TEXT PCell</li><li>Static layout libraries</li><li>PCell libraries</li><li>Code libraries for Ruby and Python</li><li>Binary extensions</li></ul><p>
	Packages can depend on other packages - these are installed automatically if a package requires them and they are not installed yet.
	</p><p>
	Packages are identified by name. A package name needs to be unique in the package universe.
	You can use a prefixed name like <tt>www.mydomain.org/nameofpackage</tt> to create a non-ambiguous name.
	Use a slash to separate the prefix from the actual package name.
	The choice of the prefix is entirely up to you as long as it contains letters, digits, underscores, hypthens or dots.
	You can use a domain name that is owned by
	yourself for example. You can use multiple prefixes to further differentiate the packages
	inside your namespace.
	</p><p>
	Packages also come with version information, so KLayout can check for updates and install
	them if required. KLayout will assume strict upward compatibility. This specifically
	applies to packages that other packages are depending on (such as code libraries).
	If you need to change them in a non-backward compatible way, you'd need to provide
	a new package with a different name.
	</p><p>
	Packages come with some meta data such as authoring information, an optional icon and
	screen shot image, license information and more. The more information you provide, the
	more useful a package will become.
	</p><p>
	The key component for public package deployment is the "Salt.Mine" package repository
	service. This is a web service that maintains a package index. It
	does not host the packages, but stores links to the actual hosting site. In order
	to author a package, you need to upload the package to one of the supported host
	sites and register your package on the Salt.Mine page. Registration is a simple
	process and the only information required is the link to your host site and a mail
	account for confirmation.
	</p><a name="h2-65"></a><h2>Installing Packages</h2><p>
	To install external packages, open the package manager with "Tools/Manage Packages".
	On the "Install New Packages" page, a list of available packages is shown. Select
	the desired packages and mark them using the check mark button. Marked packages will
	be downloaded and installed with the "Apply" button.
	</p><p>
	A filter above the package list allows selecting packages by name.
	The right panel shows details about the package currently selected.
	</p><a name="h2-79"></a><h2>Updating Packages</h2><p>
	To check for updates, use the "Update Packages" tab of the package manager.
	In the list, those packages for which updates are available are shown.
	Mark packages for update using the check mark button. Click "Apply" to
	apply the selected updates.
	</p><a name="h2-88"></a><h2>Uninstalling Packages</h2><p>
	To uninstall packages, open the package manager using "Tools/Manage Packages".
	Go to the "Current Packages" tab. Select a package and use the "Remove Package"
	button to uninstall the package.
	</p><a name="h2-96"></a><h2>Creating Packages</h2><p>
	For package development you can utilize KLayout to initialize and edit the files inside
	the package folder or populate the folder manually.
	</p><p>
	KLayout offers initialization of new packages from templates. You can modify that package
	according to your requirements afterwards.
	To create a package from a template, open the package manager using "Tools/Manage Packages",
	go to the "Current Packages" tab and push the "Create (Edit) Package" button.
	Chose a template from the list that opens and enter a package name (with prefix, if
	desired). Select "Ok" to let KLayout create a new package based on the template you
	selected.
	</p><p>
	The package details can be edited with the "pen" button at the top right of the
	right details panel. Please specify at least some author information, a license
	model and a version. If the package needs other packages, the dependencies can be
	listed in the "Depends on" table. Those packages will be automatically installed
	together with the new package. The showcase image can be a screen shot that gives
	some idea what the package will do.
	The package details are kept in a file called "grain.xml" inside the package
	folder. You can also edit this file manually. The "grain.xml" is the basic description
	file for the package.
	</p><p>
	If the package is a macro or static library package, the macro editor can be used
	to edit the package files. If the package is a tech package, the technology manager
	can be used to edit the technology inside the package. To populate the package
	folder with other files use your favorite editor of KLayout itself for layout files.
	</p><a name="h2-132"></a><h2>Deployment inside your organisation</h2><p>
	Once a package is finished, it needs to be deployed to make it available to other
	users. Deployment basically means to put it on some public place where others
	can download the package. For local deployment inside an organisation,
	this can be a web server or a folder on
	a file server. KLayout talks WebDAV, so the web server needs to offer WebDAV
	access. A subversion (SVN) server provides WebDAV by default, so this is a good
	choice. For the packages themselves, Git or WebDAV/Subversion can be used. You
	need to specify the protocol in the package URL (see below).
	</p><p>
	After a package has been made available for download, it needs to be entered
	in the package index. For local deployment, the index can be a file hosted
	on a web server or on the file system. The package index location needs to be
	specified by the <tt>KLAYOUT_SALT_MINE</tt> environment variable which contains the
	download URL of the package index file.
	</p><p>
	For public deployment, the Salt.Mine service (<tt>http://sami.klayout.org</tt>) is used to register
	new packages in the package index. By default, KLayout loads the package index from that service, so
	once your package is registered there, everyone using KLayout will see it.
	</p><a name="h2-159"></a><h2>The Package Index</h2><p>
	Public Packages are published on the Salt.Mine server. This is a web service that delivers a
	packages index with some meta data such as current version, the icon
	and a brief description. KLayout uses this list to inform users of packages available
	for installation and available updates. For local deployment, the package index can be served by other
	ways too. The only requirement is to be accessible by a http, https or file URL.
	</p><p>
	The basic format of the index is XML with this structure:
	</p><pre><salt-mine>
	<salt-grain>
	<name>name</name>
	<version>Version</version>
	<title>Title of the package</title>
	<doc>A brief description</doc>
	<doc-url>Documentation URL</doc-url>
	<url>Download URL</url>
	<license>License model</license>
	<icon>Icon image: base64-encoded, 64x64 max, PNG preferred</icon>
	</salt-grain>
	...
	<include>URL to include other index files into this one</include>
	...
	</salt-mine></pre><p>
	You can include other repositories - specifically the default one - into a
	custom XML file. This allows extending the public index with local packages.
	</p><p>
	When the package manager is opened, KLayout will download the index from
	<tt>http://sami.klayout.org/repository.xml</tt>. You can set the <tt>KLAYOUT_SALT_MINE</tt>
	environment variable to a different URL which makes KLayout use another dictionary
	service, i.e. one inside your own organisation. This service can be any HTTP server
	that delivers a package list in the same format than the Salt.Mine package service.
	The URL can also be a "file:" scheme URL. In this case, KLayout will download the
	list from the given file location.
	</p><p>
	When installing a package, KLayout will simply download the files from the URL given
	in the package list. KLayout employs the WebDAV protocol to download the files.
	This protocol is spoken by Subversion and GitHub with the subversion bridge. The
	latter requires a simple translation of the original Git URL's to obtain the
	subversion equivalent.
	</p><a name="h2-212"></a><h2>Generic package URLs</h2><p>
	Package URLs are the locations from where KLayout will download the package
	files. The package data is a hierarchy of files. The package description file
	("grain.xml") needs to be located at the root of this hierarchy.
	</p><p>
	A plain package URL will instruct KLayout to download the package file from
	the given hierarchy using the WebDAV protocol. You can add "svn+" at the front
	of the URL to make this specification a little more explicit. These are
	WebDAV/Subversion URLs:
	</p><pre>https://www.klayout.org/example-package
	svn+https://www.klayout.org/example-package</pre><p>
	Git is another option to host packages. In order to use the Git protocol,
	add "git+" at the front of the URL:
	</p><pre>git+https://github.com/klayout/example-package.git</pre><p>
	This will make KLayout clone the "example-package" repository and use the default
	branch for checking out the files. It will expect a file named "grain.xml" at the
	root of the package file hierarchy.
	</p><p>
	To use a different branch or tag, specify the tag or branch name in square
	brackes. For example:
	</p><pre>git+https://github.com/klayout/example-package.git[v1.0]</pre><p>
	This will use the "v1.0" tag or branch for checking out the files.
	</p><p>
	It is also possible to have packages in the a subfolder of the repository.
	To specify the subfolder, separate the subfolder path from the repository
	URL using "+", like this:
	</p><pre>git+https://github.com/klayout/repository.git+klayout/package-data[v1.0]</pre><p>
	This will clone the "repository" project and in this project, KLayout will checkout
	files from "klayout/package-data" and below. This is also the place, where KLayout expects
	the "grain.xml" file.
	</p><a name="h2-268"></a><h2>Installation Hooks</h2><p>
	Scripts can register an event through <a href="../code/class_Application.html#m_on_salt_changed">Application#on_salt_changed</a> which
	indicates that packages have been installed or uninstalled.
	</p><p>
	Packages itself can supply special scripts which are executed after a package was installed
	or before a package is uninstalled:
	</p><ul><li><tt>_install.lym</tt>: if present, this script is executed after the package is installed.</li><li><tt>_uninstall.lym</tt>: if present, this script is executed before the package is uninstalled.</li></ul><p>
	Both scripts need to be stored in the same location as "grain.xml" and have to use
	"lym" format. This is the generic XML script format KLayout employs as an interpreter-agnostic
	script representation.
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