JetBrains Rider 2019.3 Help

Live template variables

When you expand a live template abbreviation, its variables either appear as input fields where you can type values or are replaced with values. These may be default values that you can modify or values calculated using functions.

To declare variables within templates, use the following format: $<variable_name>$.

Define each variable using an expression and provide a default value for cases when the expression fails to evaluate.

This expression may contain the following constructs:

  • String constants in double quotes

  • Names of other variables defined in a live template

  • Predefined functions with possible arguments

Configure template variables

  1. In the Settings/Preferences dialog Ctrl+Alt+S, go to Editor | Live Templates| Other Languages.

  2. Select a template where you want to configure variables.

  3. Specify variables in the template text and click Edit variables.

  4. In the Edit Template Variables dialog, you can do the following for each variable:

    • Change the variable name

    • Define the expression using predefined functions

    • Specify the default value for cases when the expression fails to evaluate

    • Specify whether you want to skip the variable when prompting the user for input if the expression evaluated successfully

Predefined template variables

JetBrains Rider supports the following predefined live template variables that cannot be modified:

  • $END$ indicates the position of the cursor when the code snippet is complete, and you can no longer press Tab to jump to the next variable.

  • $SELECTION$ is used in surround templates and denotes the code fragment to be wrapped. After the template expands, it wraps the selected text as specified in the template. For example, if you select EXAMPLE in your code and invoke the "$SELECTION$" template via the assigned abbreviation or by pressing N/A and selecting the desired template from the list, JetBrains Rider will wrap the selection in double quotes as follows: "EXAMPLE".

Predefined functions used in live template variables

The following functions can be used to define live template variables:

Function

Description

camelCase(String)

Converts a string into camelCase. For example, camelCase(my-text-file), camelCase(my text file), and camelCase(my_text_file) all return myTextFile.

capitalize(String)

Capitalizes the first letter of the parameter.

capitalizeAndUnderscore(String)

Capitalizes all the letters of a CamelCase name passed as the parameter, and inserts an underscore between the parts. For example, capitalizeAndUnderscore(FooBar) returns FOO_BAR.

complete()

Invokes code completion at the position of the variable.

completeSmart()

Invokes smart type completion at the position of the variable.

concat(expressions...)

Returns a concatenation of all the strings passed to the function as parameters.

date(sDate)

Returns the current system date in the specified format.

Without a parameter, the current date is returned in the default system format.

date_format

To use a different format, provide a parameter according to the SimpleDateFormat specification. For example, the function date("Y-MM-d, E, H:m") will return the date formatted as 2019 - 07 - 5, Fri, 12:56.

decapitalize(sName)

Replaces the first letter of the parameter with the corresponding lowercase letter.

defaultReturnValues

Returns the default value if the expression is used in the return statement. Uses the errorVariableName parameter if the expression is of the error type.

enum(sCompletionString1,sCompletionString2,...)

Returns a list of comma-separated strings suggested for completion when the template is expanded.

escapeString(sEscapeString)

Escapes the string specified as the parameter.

expectedType()

Returns the expected type of the expression into which the template expands. Makes sense if the template expands in the right part of an assignment, after return, and so on.

fileName()

Returns the name of the current file with its extension.

fileNameWithoutExtension()

Returns the name of the current file without its extension.

filePath()

Returns the absolute path to the current file.

fileRelativePath()

Returns the current file path relative to the current project. To check what the relative path is for a given file, right-click it and select Copy Reference, or pressCtrl+Shift+Alt+C.

firstWord(sFirstWord)

Returns the first word of the string passed as the parameter.

lineNumber()

Returns the current line number.

lowercaseAndDash(String)

Converts a camelCase string into lower case and inserts n-dashes as separators. For example, lowercaseAndDash(MyExampleName) returns my-example-name.

regularExpression(String, Pattern, Replacement)

Find all occurrences of Pattern in a String and replace it with Replacement. You can specify the pattern as a regular expression to find everything that matches it in the string.

snakeCase(String)

Converts a string into snake_case. For example, snakeCase(fooBar) returns foo_bar.

spaceSeparated(String)

Converts a string into lowercase and inserts spaces as separators. For example, spaceSeparated(fooBar) returns foo bar.

spacesToUnderscores(sParameterWithSpaces)

Replaces spaces with underscores in the string passed as the parameter. For example, spacesToUnderscores(foo bar) returns foo_bar.

substringBefore(String,Delimiter)

Removes the extension after the specified delimiter and returns only the filename. This is helpful for test file names (for example, substringBefore($FileName$,".") returns component-test in component-test.js).

time(sSystemTime)

Returns the current system time in the specified format.

Without a parameter, the current time is returned in the default system format.

To use a different format, provide a parameter according to the SimpleDateFormat specification. For example, the function time("H:m z") will return the timestamp formatted as 13:10 UTC.

underscoresToCamelCase(String)

Replaces underscores with camelCase letters in the string passed as the parameter. For example, underscoresToCamelCase(foo_bar) returns fooBar.

underscoresToSpaces(sParameterWithUnderscores)

Replaces underscores with spaces in the string passed as the parameter. For example, underscoresToSpaces(foo_bar) returns foo bar.

user()

Returns the name of the current user.

Last modified: 24 February 2020