docs: remove unnecessary and true in example config

[herrscher-of-sleeping]

Description

Just a small cleanup in example config. and true does nothing unless I'm missing something here.

Related Issue(s)

None

Screenshots

None

[github-actions]

This PR is stale because it has been open 30 days with no activity.

[DrKJeff16]

@herrscher-of-sleeping
That and true is a logical expression to give a default value if vim.g.lazydev_enabled is not explicitly set.
In a nutshell, this statement:

return vim.g.lazydev_enabled == nil and true or vim.g.lazydev_enabled

is IDENTICAL to the following statement:

if vim.g.lazydev_enabled == nil then -- if variable is nil
    return true -- Return default value (`true`)
end

-- Otherwise, return the value (whether `true` or `false`) of `vim.g.lazydev_enabled`
return vim.g.lazydev_enabled 

Essentially this is just a safeguard to enable the plugin unless explicitly said not to.

The Lua reference is here

[herrscher-of-sleeping]

Maybe I'm missing something here, but still let me explain.

There's no difference between vim.g.lazydev_enabled == nil and true and vim.g.lazydev_enabled == nil, other than extra code. It's not a ternary operator-like thing (Lua doesn't have such, and x and y or z put in its place tends to lead to logical mistakes) and it doesn't have to look like one.

vim.g.lazydev_enabled == nil evaluates to either false or true, and if it's:

1. false, then vim.g.lazydev_enabled == nil and true will also be false, because false and true is false. The whole expression then evaluates to whatever vim.g.lazydev_enabled is.
2. true, then vim.g.lazydev_enabled == nil and true is also true, and the whole expression evaluates to true.

Hence there's no point in adding and true.

I also prepared an example script that compares result of all the 3 versions of this calculation for all possible inputs that make sense to be tested:

1. nil (falsey value)
2. false (also falsey value, but is used when we explicitly set vim.g.lazydev_enabled to false)
3. true (obviously truthy)
4. "kutulu" (truthy value, any other value in Lua is truthy and the expression will work the same way)

local function calc0(lazydev_enabled)
  if lazydev_enabled == nil then
      return true
  end

  return lazydev_enabled
end

local function calc1(lazydev_enabled)
  return lazydev_enabled == nil and true or lazydev_enabled
end

local function calc2(lazydev_enabled)
  return lazydev_enabled == nil or lazydev_enabled
end

local input_values = {
  nil,
  false,
  true,
  "kutulu",
}

for i = 1, 4 do
  local value = input_values[i]
  print(("result for %6s is: %6s, %6s, %6s"):format(value, calc0(value), calc1(value), calc2(value)))
end

All the three functions return the same value:

result for    nil is:   true,   true,   true
result for  false is:  false,  false,  false
result for   true is:   true,   true,   true
result for kutulu is: kutulu, kutulu, kutulu

[github-actions]

This PR is stale because it has been open 30 days with no activity.