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plugin_dependencies.md: note unique filenames (IJSDK-916)

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Yann Cébron 2020-11-17 18:42:17 +01:00
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basics/plugin_structure/plugin_dependencies.md
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@ -77,18 +77,25 @@ Continuing with the example from [Section 2](#2-project-setup) above, the depend
## Optional Plugin Dependencies
A project can also specify an optional plugin dependency.
In this case, the plugin will load even if the plugin depends on is not installed or enabled, but part of the plugin's functionality will not be available.
In order to do that, add `optional="true" config-file="otherconfig.xml"` to the `<depends>` tag.
In this case, the plugin will load even if the plugin it depends on is not installed or enabled, but part of the plugin's functionality will not be available.
For example, if a plugin project adds additional highlighting for Java and Kotlin files, use the following setup.
The main `plugin.xml` will define an annotator for Java and specify an optional dependency on the Kotlin plugin:
Declare additional `optional="true"` and `config-file` attribute pointing to optional plugin descriptor file:
```xml
<depends optional="true" config-file="myPluginId-optionalPluginName.xml">dependency.plugin.id</depends>
```
> **NOTE** Additional plugin descriptor files must follow the naming pattern `myPluginId-$NAME$.xml` resulting in unique filenames to prevent problems with classloaders in tests ([Details](https://youtrack.jetbrains.com/issue/IDEA-205964)).
For example, if a plugin adds additional highlighting for Java and Kotlin files, use the following setup.
The main `plugin.xml` will define an annotator for Java and specify an optional dependency on the Kotlin plugin (`org.jetbrains.kotlin`):
_plugin.xml_
```xml
<idea-plugin>
...
<depends optional="true" config-file="withKotlin.xml">org.jetbrains.kotlin</depends>
<depends optional="true" config-file="myPluginId-withKotlin.xml">org.jetbrains.kotlin</depends>
<extensions defaultExtensionNs="com.intellij">
<annotator language="JAVA" implementationClass="com.example.MyJavaAnnotator"/>
@ -96,10 +103,10 @@ _plugin.xml_
</idea-plugin>
```
Then create a file called `withKotlin.xml`, in the same directory as the main `plugin.xml` file.
Then create a file called `myPluginId-withKotlin.xml`, in the same directory as the main `plugin.xml` file.
In that file, define an annotator for Kotlin:
_withKotlin.xml_
_myPluginId-withKotlin.xml_
```xml
<idea-plugin>