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# Unstable Wayland Module
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This module is available since version 0.62.0.
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This module provides helper functions to find wayland protocol
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xmls and to generate .c and .h files using wayland-scanner
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**Note**: this module is unstable. It is only provided as a technology
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preview. Its API may change in arbitrary ways between releases or it
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might be removed from Meson altogether.
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## Quick Usage
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```meson
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project('hello-wayland', 'c')
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wl_dep = dependency('wayland-client')
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wl_mod = import('unstable-wayland')
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xml = wl_mod.find_protocol('xdg-shell')
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xdg_shell = wl_mod.scan_xml(xml)
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executable('hw', 'main.c', xdg_shell, dependencies : wl_dep)
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```
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## Methods
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### find_protocol
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```meson
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xml = wl_mod.find_protocol(
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'xdg-decoration',
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state : 'unstable',
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version : 1,
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)
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```
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This function requires one positional argument: the protocol base name.
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It takes the following keyword arguments:
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- `state` Optional arg that specifies the current state of the protocol.
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Either `'stable'`, `'staging'`, or `'unstable'`. The default is `'stable'`.
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- `version` The backwards incompatible version number as integer.
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Required for staging and unstable, but not allowed for stable.
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**Returns**: a [[@file]] that can be passed to [scan_xml](#scan_xml)
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### scan_xml
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```meson
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generated = wl_mod.scan_xml(
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'my-protocol.xml',
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client : true,
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server : true,
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public : false,
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)
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```
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This function accepts one or more arguments of either string or file type.
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It takes the following keyword arguments:
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- `public` Optional arg that specifies the scope of the generated code.
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The default is false.
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- `client` Optional arg that specifies if client side header file is
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generated. The default is true.
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- `server` Optional arg that specifies if server side header file is
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generated. The default is false.
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**Returns**: a list of [[@custom_tgt]] in the order source, client side header,
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server side header. Generated header files have the name
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`<name>-<client|server>-protocol.h`.
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## Links
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- [Official Wayland Documentation](https://wayland.freedesktop.org/docs/html/)
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- [Wayland GitLab](https://gitlab.freedesktop.org/wayland)
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- [Wayland Book](https://wayland-book.com/)
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