Code Style. Kotlin
Use this page to configure formatting options for Kotlin files. When you change these settings, the Preview pane shows how this will affect your code.
Tabs and Indents
Use tab character
The Smart tabs checkbox is available if the Use tab character checkbox is selected.
In this field, specify the number of spaces included in a tab.
In this field, specify the number of spaces to be inserted for each indent level.
In this field, specify the number of spaces to be inserted between the elements of an array, in expressions, method declarations and method calls.
Keep indents on empty lines
If this checkbox is selected, IntelliJ IDEA will keep indents on the empty lines as if they contained some code.
If this checkbox is cleared, IntelliJ IDEA will delete the tab characters and spaces.
Use this tab to specify where you want spaces in your code. To have IntelliJ IDEA automatically insert a space at a location, select the checkbox next to this location in the list. The results are displayed in the preview pane.
Wrapping and Braces
In this tab, customize the code style options, which IntelliJ IDEA will apply on reformatting the source code. The left-hand pane contains the list of exceptions (Keep when reformatting), and placement and alignment options for the various code constructs (lists, statements, operations, annotations, and so on) The right-hand pane shows the preview.
Alignment takes precedence over indentation options.
Hard wrap at
Use the Hard wrap at field to specify a margin space required on the right side of an element. If you select the Default option, then a value of the right margin from the global settings is used.
Wrap on typing
Use the Wrap on typing settings to specify how the edited text is fitted in the specified Hard wrap at:
Default: in this case IntelliJ IDEA uses the Wrap on typing option that is specified in the global settings.
Yes: in this case IntelliJ IDEA uses the value specified in the Right Margin field.
No: in this case this option is switched off and a line can exceed the value specified in the right margin.
Use the Visual guides field to specify multiple right margins. You can leave a default value or enter the number of spaces for your margin. If you want to specify several margins, enter numbers separated by comma.
Keep when reformatting
Use the checkboxes to configure exceptions that IntelliJ IDEA will make when reformatting the source code. For example, by default, the Line breaks checkbox is selected. If your code contains lines that are shorter than a standard convention, you can convert them by disabling the Line breaks checkbox before you reformat the source code.
The wrapping style applies to the various code constructs, specified in the left-hand pane (for example, method call arguments, method declaration parameters, or assignment statements).
From this list, select the desired wrapping style:
Align when multiline
If this checkbox is selected, a code construct starts at the same column on each next line. Otherwise, the position of a code construct is determined by the current indentation level.
Use this tab to define where and how many blank lines you want IntelliJ IDEA to retain and insert in your code after reformatting. For each type of location, specify the number of blank lines to be inserted. The results are displayed in the preview pane.
Keep maximum blank lines
In this area, specify the number of blank lines to be kept after reformatting in the specified locations.
Minimum blank lines
In this area, specify the number of blank lines to be present in the specified locations.
Use this area to define how the top-level symbols are imported. The possible options are:
Java Statics and Enum Members
Use this area to define how Java statics and enums are imported.
Use this area to define how the other symbols are imported.
Insert imports for nested classes:
Packages to Use Import with '*'
Use the table as follows:
Use trailing comma
Add a comma symbol after the last item of a series of elements.
class Person( val firstName: String, val lastName: String, val age: Int, // trailing comma )
The Kotlin style guide encourages the use of trailing commas at the declaration site and leaves it at your discretion for the call site. For more information, refer to Kotlin coding conventions.
Use this area to configure code style for generated comments (line Control+/ and block Control+Shift+/):
Click this link to reveal the list of languages to be used as the base for the current language code style. Only the settings that are applicable to the current language are taken. All the other settings are not affected.
This link appears in the upper-right corner of the language-specific code style page, when applicable.
Click Reset to discard changes and return to the initial set of code style settings.