chore: add error code constants

[mikesmithgh]

I noticed errno is missing and added the values by running errono -ls on my Mac. I also added UNKOWN because I saw that when I inspected the uv.errno table in Neovim.

This has the same issue as constants in that the errno can change depending on the system, unix vs windows.

[Bilal2453]

I am a bit confused, as there is no such field in luv (luv.errno is nil). What is this defining exactly?

[Bilal2453]

Oh right, that was a recent addition to Luv now that I think about it. I even PRed it into the docs. Hm regarding the values though I am indeed slightly concerned about system inconsistencies. I have been thinking on how to do this while:

a) Document the exact field names. (So uv.errno.something_random wouldn't show a string type.)
b) Not have to define any exact values, just that it is an integer.

Do you have any ideas how to approach that?

[Bilal2453]

I think for now we will go with something like this 3069b62. Just an alias that has all the fields. Can you do this?

Also use --- for descriptions, the description also needs to be right above the table value, like this:

---
---description here!
---
---@type uv.errno
uv.errno = {}

[mikesmithgh]

Hey @Bilal2453 thanks for the response. Yep that makes total sense to me. I'll make those changes 👍

[mikesmithgh]

Hey @Bilal2453 I have made the updates. I have only used this in the context of Neovim. Here is what the completion looks like after the change:

(field) uv.errno: { E2BIG: integer, EACCES: integer, EADDRINUSE: integer, EADDRNOTAVAIL: integer, EAFNOSUPPORT: integer, EAGAIN: integer, EAI_ADDRFAMILY: integer, EAI_AGAIN: integer, EAI_BADFLAGS: i...(too long)... integer } {
    E2BIG: integer,
    EACCES: integer,
    EADDRINUSE: integer,
    EADDRNOTAVAIL: integer,
    EAFNOSUPPORT: integer,
    EAGAIN: integer,
    EAI_ADDRFAMILY: integer,
    EAI_AGAIN: integer,
    EAI_BADFLAGS: integer,
    EAI_BADHINTS: integer,
    EAI_CANCELED: integer,
    EAI_FAIL: integer,
    EAI_FAMILY: integer,
    EAI_MEMORY: integer,
    EAI_NODATA: integer,
    EAI_NONAME: integer,
    EAI_OVERFLOW: integer,
    EAI_PROTOCOL: integer,
    EAI_SERVICE: integer,
    EAI_SOCKTYPE: integer,
    EALREADY: integer,
    EBADF: integer,
    EBUSY: integer,
    ECANCELED: integer,
    ECHARSET: integer,
    ECONNABORTED: integer,
    ECONNREFUSED: integer,
    ECONNRESET: integer,
    EDESTADDRREQ: integer,
    EEXIST: integer,
    EFAULT: integer,
    EFBIG: integer,
    EFTYPE: integer,
    EHOSTDOWN: integer,
    EHOSTUNREACH: integer,
    EILSEQ: integer,
    EINTR: integer,
    EINVAL: integer,
    EIO: integer,
    EISCONN: integer,
    EISDIR: integer,
    ELOOP: integer,
    EMFILE: integer,
    EMLINK: integer,
    EMSGSIZE: integer,
    ENAMETOOLONG: integer,
    ENETDOWN: integer,
    ENETUNREACH: integer,
    ENFILE: integer,
    ENOBUFS: integer,
    ...(+33)
}

A table value which exposes error constants as a map, where the key is the
error name (without the `UV_` prefix) and its value is a negative number.
See Libuv's "Error constants" page for further details.
(https://docs.libuv.org/en/v1.x/errors.html#error-constants)

Note: Implementation detail: on Unix error codes are the negated errno (or -errno),
while on Windows they are defined by libuv to arbitrary negative numbers.

I also removed some values, and used the values from lua print(vim.inspect(vim.loop.errno))

 | Messages: {
  E2BIG = -7,
  EACCES = -13,
  EADDRINUSE = -48,
  EADDRNOTAVAIL = -49,
  EAFNOSUPPORT = -47,
  EAGAIN = -35,
  EAI_ADDRFAMILY = -3000,
  EAI_AGAIN = -3001,
  EAI_BADFLAGS = -3002,
  EAI_BADHINTS = -3013,
  EAI_CANCELED = -3003,
  EAI_FAIL = -3004,
  EAI_FAMILY = -3005,
  EAI_MEMORY = -3006,
  EAI_NODATA = -3007,
  EAI_NONAME = -3008,
  EAI_OVERFLOW = -3009,
  EAI_PROTOCOL = -3014,
  EAI_SERVICE = -3010,
  EAI_SOCKTYPE = -3011,
  EALREADY = -37,
  EBADF = -9,
  EBUSY = -16,
  ECANCELED = -89,
  ECHARSET = -4080,
  ECONNABORTED = -53,
  ECONNREFUSED = -61,
  ECONNRESET = -54,
  EDESTADDRREQ = -39,
  EEXIST = -17,
  EFAULT = -14,
  EFBIG = -27,
  EFTYPE = -79,
  EHOSTDOWN = -64,
  EHOSTUNREACH = -65,
  EILSEQ = -92,
  EINTR = -4,
  EINVAL = -22,
  EIO = -5,
  EISCONN = -56,
  EISDIR = -21,
  ELOOP = -62,
  EMFILE = -24,
  EMLINK = -31,
  EMSGSIZE = -40,
  ENAMETOOLONG = -63,
  ENETDOWN = -50,
  ENETUNREACH = -51,
  ENFILE = -23,
  ENOBUFS = -55,
  ENODATA = -96,
  ENODEV = -19,
  ENOENT = -2,
  ENOMEM = -12,
  ENONET = -4056,
  ENOPROTOOPT = -42,
  ENOSPC = -28,
  ENOSYS = -78,
  ENOTCONN = -57,
  ENOTDIR = -20,
  ENOTEMPTY = -66,
  ENOTSOCK = -38,
  ENOTSUP = -45,
  ENOTTY = -25,
  ENXIO = -6,
  EOF = -4095,
  EOVERFLOW = -84,
  EPERM = -1,
  EPIPE = -32,
  EPROTO = -100,
  EPROTONOSUPPORT = -43,
  EPROTOTYPE = -41,
  ERANGE = -34,
  EREMOTEIO = -4030,
  EROFS = -30,
  ESHUTDOWN = -58,
  ESOCKTNOSUPPORT = -44,
  ESPIPE = -29,
  ESRCH = -3,
  ETIMEDOUT = -60,
  ETXTBSY = -26,
  EXDEV = -18,
  UNKNOWN = -4094
}

Let me know what you think

[Bilal2453]

thanks!