Code Style Kotlin

File | Settings | Editor | Code Style | Kotlin for Windows and Linux
IntelliJ IDEA | Preferences | Editor | Code Style | Kotlin for macOS
Ctrl+Alt+S

Use this page to configure formatting options for Kotlin files. View the result in the Preview pane on the right.

On this page:

• Tabs and Indents
• Spaces
• Wrapping and braces
  • Keep when reformatting
  • Wrapping options
  • Alignment options
• Imports
• Set from...

Tabs and Indents

Item	Description
Use tab character	If this check box is selected, tab characters are used: On pressing the Tab key For indentation For code reformatting When the check box is cleared, IntelliJ IDEA uses spaces instead of tabs.
Smart tabs	If this check box is selected, the part of indentation defined by the nesting of code blocks, is made of the tabs and (if necessary) spaces, while the part of indentation defined by the alignment is made only of spaces. If this check box is cleared, only tabs are used. This means that a group of spaces that fits the specified tab size is automatically replaced with a tab, which may result in breaking fine alignment. The Smart Tabs check box is available if the Use Tab Character check box is selected.
Tab size	In this text box, specify the number of spaces included in a tab.
Indent	In this text box, specify the number of spaces (or tabs if the Use Tab Character check box is selected) to be inserted for each indent level.
Continuation indent	In this text box, specify the number of spaces (or tabs if the Use Tab Character check box is selected) to be inserted between the elements of an array, in expressions, method declarations and method calls.
Keep indents on empty lines	If this check box is selected, then IntelliJ IDEA will keep indents on the empty lines as if they contained some code. If this check box is not selected, IntelliJ IDEA will delete the tab characters and spaces.

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 check box 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, etc.) The right-hand pane shows preview.

Alignment takes precedence over indentation options.

Keep when reformatting

Use the check boxes to configure exceptions that IntelliJ IDEA will make when reformatting the source code. For example, by default, the Line breaks check box is selected. If your code contains lines that are shorter than a standard convention, you can convert them by disabling the Line breaks check box before you reformat the source code.

Wrapping options

The wrapping style applies to the various code constructs, specified in the left-hand pane (for example, method call arguments, or assignment statements).

Item

Description

Wrapping style

From this drop-down list, select the desired wrapping style: Do not wrap - when this option is selected, no special wrapping style is applied. With this option selected, the nested alignment and braces settings are ignored. Wrap if long - select this option to have lines going beyond the right margin wrapped with proper indentation. Wrap always - select this option to have all elements in lists wrapped so that there is one element per line with proper indentation. Chop down if long - select this option to have elements in lists that go beyond the right margin wrapped so that there is one element per line with proper indentation.

Alignment options

Item	Description
Align when multiline	If this check box 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.

Imports

Item	Description
Top-level Symbols	Use this area to define how the top-level symbols are imported. The possible options are: Use single name import: if this option is selected, only a particular declaration from a package during code generation or import optimization is imported. Use import with '*': if this option is selected, a statement importing an entire package is inserted. Use import with '*' if at least <n> names used: if this option is selected, specify the number of declarations to be imported from a single package, until all the statements importing a single declaration are substituted with a statement importing an entire package.
Java Statics and Enum Members	Use this area to define how Java statics and enums are imported.
Other	Use this area to define how the other symbols are imported. Insert imports for nested classes: If this check box is selected, IntelliJ IDEA creates imports for the nested classes referenced in your code. If this option is not selected, IntelliJ IDEA generates import for the top-level class and qualifies the name of the nested class with the name of its top-level class.
Packages to Use Import with '*'	Use the table as follows: Package: In the text fields of this column, specify the packages to be imported. With Subpackages: Select this check box to have IntelliJ IDEA import all the subpackages of the selected package.

Set from...

Click this link to reveal the list of languages to be used as the base for the current language code style. So doing, 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.