How can i run plugin from startup in background?

>but now what i want to do is run the plugin after IDE starts in background,
com.intellij.openapi.components.ProjectComponent / ApplicationComponent
Will be called when project / application are opened/closed.
http://www.jetbrains.org/intellij/sdk/docs/basics/plugin_structure/plugin_components.html


>get the current opened file
com.intellij.openapi.fileEditor.FileEditorManager#getSelectedTextEditor

com.intellij.openapi.fileEditor.FileEditorManagerListener
ex: project.getMessageBus().connect().subscribe(FileEditorManagerListener.FILE_EDITOR_MANAGER, new MyEditorManagerListener());

But it's probably not what you want to do. Could you describe your use case in more detail?


>add some icons on bar of line numbers and on click so some popup
com.intellij.openapi.editor.markup.GutterIconRenderer
Ex:

RangeHighlighter highlighter = editor.getMarkupModel()
 .addRangeHighlighter(startOffset, endOffset, HighlighterLayer.LAST + 1, null, HighlighterTargetArea.EXACT_RANGE);

highlighter.setGutterIconRenderer(new GutterIconRenderer() {
 @NotNull
 @Override
 public Icon getIcon() {
 return AllIcons.Actions.Rerun;
 }

 @Nullable
 @Override
 public AnAction getClickAction() {
 return new DumbAwareAction() {
 @Override
 public void actionPerformed(AnActionEvent e) {
 System.out.println("Hello");
 }
 };
 }

 @Override
 public boolean equals(Object obj) {
 return obj == this;
 }

 @Override
 public int hashCode() {
 return Objects.hashCode(this);
 }
});

highlighter.dispose(); // later

http://www.jetbrains.org/intellij/sdk/docs/reference_guide/work_with_icons_and_images.html
http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/creating_an_action.html


>also api to access notifier of IDE
com.intellij.notification.Notification
ex: new Notification("SomeNotificationGroup", "Notification Title", "More text<br>with description", NotificationType.ERROR).notify(project);
http://www.jetbrains.org/intellij/sdk/docs/user_interface_components/notifications.html

Thank you aleksey for this help,

Can you provide me some help on accessing database to store data and api of VCS(GIT) like getting of current branch

>api of VCS(GIT) like getting of current branch
git4idea.repo.GitRepository
git4idea.commands.Git
4ex: GitUtil.getRepositoryManager(project).getRepositories(), GitRepository#getCurrentBranch

There are some VCS-agnostic APIs (mostly accessed via AbstractVcs class), but "current branch" and many others have no abstraction.
see: com.intellij.vcsUtil.VcsUtil#getVcsFor

Please, remember to add "<depends>Git4Idea</depends>" to plugin.xml if you rely on git4idea package. (to avoid confusing errors if this plugin is disabled)


>on accessing database to store data
Are you looking for access to DataGrip-related functionality, or just persisting plugin-related data on disk?

Just to store plugin related data ,

I hope there is key value pair kind of data store.

Thank you

>key value pair kind of data store.
com.intellij.openapi.components.PersistentStateComponent

http://www.jetbrains.org/intellij/sdk/docs/basics/persisting_state_of_components.html

Thank You very much Aleksey!