example-input.js

"this is a really long string this is a really long string this is a really long string this is a really long string this is a really long string this is a really long string this is a really long string this is a really long string this is a really long string this is a really long string this is a really long string"

var f = function(){
    var str = "this is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long string"
    var short = "str"

    console.log('i love js muchly')
}


var o = {
    fn: function(){
        "this is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long stringthis is a really long string"
    }
}

example-output.js

"this is a really long string this is a r"
 + "eally long string this is a really long "
 + "string this is a really long string this"
 + " is a really long string this is a reall"
 + "y long string this is a really long stri"
 + "ng this is a really long string this is "
 + "a really long string this is a really lo"
 + "ng string this is a really long string"

var f = function(){
    var str = "this is a really long stringthis is a re"
 + "ally long stringthis is a really long st"
 + "ringthis is a really long stringthis is "
 + "a really long stringthis is a really lon"
 + "g stringthis is a really long stringthis"
 + " is a really long stringthis is a really"
 + " long string"
    var short = "str"

    console.log("i love js muchly")
}


var o = {
    fn: function(){
        "this is a really long stringthis is a re"
 + "ally long stringthis is a really long st"
 + "ringthis is a really long stringthis is "
 + "a really long stringthis is a really lon"
 + "g stringthis is a really long stringthis"
 + " is a really long stringthis is a really"
 + " long string"
    }
}

ugly-string-len-limit.js

#!/usr/bin/env node

var falafel = require('falafel')
var fs = require('fs')

var src = fs.readFileSync(process.argv[2]).toString()

var chunk = function(str, size){
    var a = []
    for ( var i = 0; i < str.length; i += size ) a.push(str.substr(i, size))
    return a
}


var out = falafel(src, function(node){
    if ( node.type === 'Literal' && typeof node.value === 'string' ) {
        node.update('"' + chunk(node.value, 40).join('"\n + "') + '"')
    }
})

console.log(out)