Add support for indenting method chaining

[idbrii]

Support indenting chained method calls:

  local colon_out = self.kitchen
    :getContents()
    :getCheese()
    :enjoyCheese(self
      .mouth()
      .open()
      .extendTongue())
    :eatCheese()
    :digestCheese()

Also tested on this real world example (that gist reflects how indent is applied which differs slightly from the original form) and the screenshot code (unsurprisingly unchanged).

[idbrii]

I couldn't find it elsewhere, so here's the screenshot code:

local app = require 'app'

---- Vector class.
-- @type Vector
local Vector = {}
Vector.__index = Vector

function Vector:new(x, y, z)
    return setmetatable({x = x, y = y, z = z}, Vector)
end

function Vector:magnitude()
    return math.sqrt(self.x^2, self.y^2, self.z^2)
end

-- TODO remove this
local vec = Vector:new(0, 1, 0)
app.log(vec:magnitude())
app.log(vec.x)

[idbrii]

It doesn't properly handle this case:

    S.tween.always:to(boids.tuning.weights, 5, {
            target = 1,
        })
        :ease("elasticout")
        :onupdate(function()
        boids.normalize_weights() -- expected more indent here
    end)