wsl - Whitespace Linter

wsl is a linter that enforces a very non scientific vision of how to make code more readable by enforcing empty lines at the right places.

This linter is aggressive and a lot of projects I've tested it on have failed miserably. For this linter to be useful at all I want to be open to new ideas, configurations and discussions! Also note that some of the warnings might be bugs or unintentional false positives so I would love an issue to fix, discuss, change or make something configurable!

Installation

# Latest release
go install github.com/bombsimon/wsl/v4/cmd/wsl

# Main branch
go install github.com/bombsimon/wsl/v4/cmd/wsl@master

Usage

Note: This linter provides a fixer that can fix most issues with the --fix flag. However, currently golangci-lint does not support suggested fixes so the --fix flag in golangci-lint will not work.

wsl uses the analysis package meaning it will operate on package level with the default analysis flags and way of working.

wsl --help
wsl [flags] </path/to/package/...>

wsl --allow-cuddle-declarations --fix ./...

wsl is also integrated in golangci-lint

golangci-lint run --no-config --disable-all --enable wsl

Issues and configuration

The linter suppers a few ways to configure it to satisfy more than one kind of code style. These settings could be set either with flags or with YAML configuration if used via golangci-lint.

The supported configuration can be found in the documentation.

Below are the available checklist for any hit from wsl. If you do not see any, feel free to raise an issue.

Note: this linter doesn't take in consideration the issues that will be fixed with go fmt -s so ensure that the code is properly formatted before use.

• Anonymous switch statements should never be cuddled
• Append only allowed to cuddle with appended value
• Assignments should only be cuddled with other assignments
• Block should not end with a whitespace (or comment)
• Block should not start with a whitespace
• Case block should end with newline at this size
• Branch statements should not be cuddled if block has more than two lines
• Declarations should never be cuddled
• Defer statements should only be cuddled with expressions on same variable
• Expressions should not be cuddled with blocks
• Expressions should not be cuddled with declarations or returns
• For statement without condition should never be cuddled
• For statements should only be cuddled with assignments used in the iteration
• Go statements can only invoke functions assigned on line above
• If statements should only be cuddled with assignments
• If statements should only be cuddled with assignments used in the if statement itself
• If statements that check an error must be cuddled with the statement that assigned the error
• Only cuddled expressions if assigning variable or using from line above
• Only one cuddle assignment allowed before defer statement
• Only one cuddle assignment allowed before for statement
• Only one cuddle assignment allowed before go statement
• Only one cuddle assignment allowed before if statement
• Only one cuddle assignment allowed before range statement
• Only one cuddle assignment allowed before switch statement
• Only one cuddle assignment allowed before type switch statement
• Ranges should only be cuddled with assignments used in the iteration
• Return statements should not be cuddled if block has more than two lines
• Short declarations should cuddle only with other short declarations
• Switch statements should only be cuddled with variables switched
• Type switch statements should only be cuddled with variables switched