coffeelint/src/rules/no_tabs.coffee

Lint your CoffeeScript

indentationRegex = /\S/
module.exports = class NoTabs
    rule:
        name: 'no_tabs'
        level : 'error'
        message : 'Line contains tab indentation'
        description: """
            This rule forbids tabs in indentation. Enough said. It is enabled by
            default.
            """

    lintLine: (line, lineApi) ->
        # Only check lines that have compiled tokens. This helps
        # us ignore tabs in the middle of multi line strings, heredocs, etc.
        # since they are all reduced to a single token whose line number
        # is the start of the expression.
        indentation = line.split(indentationRegex)[0]
        if lineApi.lineHasToken() and '\t' in indentation
            true
        else
            null