TSV formatter for eslint

tsv-formatter.js

// output eslint results in TSV format

module.exports = function ( results = [] ) {
  const sep = "\t"
  , severity = [ '', 'warning', 'error' ]
  , path = require( 'path' )
  , eslint = require( 'eslint' )
  , cwd = process.cwd()
  , header = function () {
      console.log( [ 'file', 'line', 'column', 'severity', 'fixable', 'code', 'description' ].join( sep ) );
  }
  , lintfree = function () {
      console.log( 'All files lint free!' );
  }
  , fixable = {}
  , linter = new eslint.Linter()
  ;

  let found = false
  , rules = linter.getRules()
  ;

  rules.forEach( ( val, key ) => {
    if ( val.meta.fixable ) {
      fixable[key] = true;
    }
  });

  results.forEach( r => {
    if ( r.messages.length > 0 ) {
      if ( !found ) {
        header();
        found = true;
      }
      const file = path.relative( cwd, r.filePath );
      r.messages.forEach( m => {
        console.log( [
        file
        , m.line
        , m.column
        , severity[ m.severity ]
        , m.ruleId && fixable.hasOwnProperty(m.ruleId) ? 'true' : 'false'
        , ( m.ruleId
            ? m.ruleId
            : m.message.indexOf('Parsing error') !== -1
              ? 'parse-error'
              : '-' )
        , m.message
        ].join( sep ) );
      });
    }
  });
  if ( !found ) {
    lintfree();
  }
};