Meh I'll figure out submodules later

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/array.lua

@@ -0,0 +1,70 @@
+local assert = require('luassert.assert')
+local say = require('say')
+
+-- Example usage:
+-- local arr = { "one", "two", "three" }
+--
+-- assert.array(arr).has.no.holes()   -- checks the array to not contain holes --> passes
+-- assert.array(arr).has.no.holes(4)  -- sets explicit length to 4 --> fails
+--
+-- local first_hole = assert.array(arr).has.holes(4)     -- check array of size 4 to contain holes --> passes
+-- assert.equal(4, first_hole)        -- passes, as the index of the first hole is returned
+
+
+-- Unique key to store the object we operate on in the state object
+-- key must be unique, to make sure we do not have name collissions in the shared state object
+local ARRAY_STATE_KEY = "__array_state"
+
+-- The modifier, to store the object in our state
+local function array(state, args, level)
+  assert(args.n > 0, "No array provided to the array-modifier")
+  assert(rawget(state, ARRAY_STATE_KEY) == nil, "Array already set")
+  rawset(state, ARRAY_STATE_KEY, args[1])
+  return state
+end
+
+-- The actual assertion that operates on our object, stored via the modifier
+local function holes(state, args, level)
+  local length = args[1]
+  local arr = rawget(state, ARRAY_STATE_KEY) -- retrieve previously set object
+  -- only check against nil, metatable types are allowed
+  assert(arr ~= nil, "No array set, please use the array modifier to set the array to validate")
+  if length == nil then
+    length = 0
+    for i in pairs(arr) do
+      if type(i) == "number" and
+         i > length and
+         math.floor(i) == i then
+        length = i
+      end
+    end
+  end
+  assert(type(length) == "number", "expected array length to be of type 'number', got: "..tostring(length))
+  -- let's do the actual assertion
+  local missing
+  for i = 1, length do
+    if arr[i] == nil then
+      missing = i
+      break
+    end
+  end
+  -- format arguments for output strings;
+  args[1] = missing
+  args.n = missing and 1 or 0
+  return missing ~= nil, { missing } -- assert result + first missing index as return value
+end
+
+-- Register the proper assertion messages
+say:set("assertion.array_holes.positive", [[
+Expected array to have holes, but none was found.
+]])
+say:set("assertion.array_holes.negative", [[
+Expected array to not have holes, hole found at position: %s
+]])
+
+-- Register the assertion, and the modifier
+assert:register("assertion", "holes", holes,
+                  "assertion.array_holes.positive",
+                  "assertion.array_holes.negative")
+
+assert:register("modifier", "array", array)

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/assert.lua

@@ -0,0 +1,180 @@
+local s = require 'say'
+local astate = require 'luassert.state'
+local util = require 'luassert.util'
+local unpack = util.unpack
+local obj   -- the returned module table
+local level_mt = {}
+
+-- list of namespaces
+local namespace = require 'luassert.namespaces'
+
+local function geterror(assertion_message, failure_message, args)
+  if util.hastostring(failure_message) then
+    failure_message = tostring(failure_message)
+  elseif failure_message ~= nil then
+    failure_message = astate.format_argument(failure_message)
+  end
+  local message = s(assertion_message, obj:format(args))
+  if message and failure_message then
+    message = failure_message .. "\n" .. message
+  end
+  return message or failure_message
+end
+
+local __state_meta = {
+
+  __call = function(self, ...)
+    local keys = util.extract_keys("assertion", self.tokens)
+
+    local assertion
+
+    for _, key in ipairs(keys) do
+      assertion = namespace.assertion[key] or assertion
+    end
+
+    if assertion then
+      for _, key in ipairs(keys) do
+        if namespace.modifier[key] then
+          namespace.modifier[key].callback(self)
+        end
+      end
+
+      local arguments = util.make_arglist(...)
+      local val, retargs = assertion.callback(self, arguments, util.errorlevel())
+
+      if (not val) == self.mod then
+        local message = assertion.positive_message
+        if not self.mod then
+          message = assertion.negative_message
+        end
+        local err = geterror(message, rawget(self,"failure_message"), arguments)
+        error(err or "assertion failed!", util.errorlevel())
+      end
+
+      if retargs then
+        return unpack(retargs)
+      end
+      return ...
+    else
+      local arguments = util.make_arglist(...)
+      self.tokens = {}
+
+      for _, key in ipairs(keys) do
+        if namespace.modifier[key] then
+          namespace.modifier[key].callback(self, arguments, util.errorlevel())
+        end
+      end
+    end
+
+    return self
+  end,
+
+  __index = function(self, key)
+    for token in key:lower():gmatch('[^_]+') do
+      table.insert(self.tokens, token)
+    end
+
+    return self
+  end
+}
+
+obj = {
+  state = function() return setmetatable({mod=true, tokens={}}, __state_meta) end,
+
+  -- registers a function in namespace
+  register = function(self, nspace, name, callback, positive_message, negative_message)
+    local lowername = name:lower()
+    if not namespace[nspace] then
+      namespace[nspace] = {}
+    end
+    namespace[nspace][lowername] = {
+      callback = callback,
+      name = lowername,
+      positive_message=positive_message,
+      negative_message=negative_message
+    }
+  end,
+
+  -- unregisters a function in a namespace
+  unregister = function(self, nspace, name)
+    local lowername = name:lower()
+    if not namespace[nspace] then
+      namespace[nspace] = {}
+    end
+    namespace[nspace][lowername] = nil
+  end,
+
+  -- registers a formatter
+  -- a formatter takes a single argument, and converts it to a string, or returns nil if it cannot format the argument
+  add_formatter = function(self, callback)
+    astate.add_formatter(callback)
+  end,
+
+  -- unregisters a formatter
+  remove_formatter = function(self, fmtr)
+    astate.remove_formatter(fmtr)
+  end,
+
+  format = function(self, args)
+    -- args.n specifies the number of arguments in case of 'trailing nil' arguments which get lost
+    local nofmt = args.nofmt or {}  -- arguments in this list should not be formatted
+    local fmtargs = args.fmtargs or {} -- additional arguments to be passed to formatter
+    for i = 1, (args.n or #args) do -- cannot use pairs because table might have nils
+      if not nofmt[i] then
+        local val = args[i]
+        local valfmt = astate.format_argument(val, nil, fmtargs[i])
+        if valfmt == nil then valfmt = tostring(val) end -- no formatter found
+        args[i] = valfmt
+      end
+    end
+    return args
+  end,
+
+  set_parameter = function(self, name, value)
+    astate.set_parameter(name, value)
+  end,
+
+  get_parameter = function(self, name)
+    return astate.get_parameter(name)
+  end,
+
+  add_spy = function(self, spy)
+    astate.add_spy(spy)
+  end,
+
+  snapshot = function(self)
+    return astate.snapshot()
+  end,
+
+  level = function(self, level)
+    return setmetatable({
+        level = level
+      }, level_mt)
+  end,
+
+  -- returns the level if a level-value, otherwise nil
+  get_level = function(self, level)
+    if getmetatable(level) ~= level_mt then
+      return nil -- not a valid error-level
+    end
+    return level.level
+  end,
+}
+
+local __meta = {
+
+  __call = function(self, bool, message, level, ...)
+    if not bool then
+      local err_level = (self:get_level(level) or 1) + 1
+      error(message or "assertion failed!", err_level)
+    end
+    return bool , message , level , ...
+  end,
+
+  __index = function(self, key)
+    return rawget(self, key) or self.state()[key]
+  end,
+
+}
+
+return setmetatable(obj, __meta)

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/assertions.lua

@@ -0,0 +1,334 @@
+-- module will not return anything, only register assertions with the main assert engine
+
+-- assertions take 2 parameters;
+-- 1) state
+-- 2) arguments list. The list has a member 'n' with the argument count to check for trailing nils
+-- 3) level The level of the error position relative to the called function
+-- returns; boolean; whether assertion passed
+
+local assert = require('luassert.assert')
+local astate = require ('luassert.state')
+local util = require ('luassert.util')
+local s = require('say')
+
+local function format(val)
+  return astate.format_argument(val) or tostring(val)
+end
+
+local function set_failure_message(state, message)
+  if message ~= nil then
+    state.failure_message = message
+  end
+end
+
+local function unique(state, arguments, level)
+  local list = arguments[1]
+  local deep
+  local argcnt = arguments.n
+  if type(arguments[2]) == "boolean" or (arguments[2] == nil and argcnt > 2) then
+    deep = arguments[2]
+    set_failure_message(state, arguments[3])
+  else
+    if type(arguments[3]) == "boolean" then
+      deep = arguments[3]
+    end
+    set_failure_message(state, arguments[2])
+  end
+  for k,v in pairs(list) do
+    for k2, v2 in pairs(list) do
+      if k ~= k2 then
+        if deep and util.deepcompare(v, v2, true) then
+          return false
+        else
+          if v == v2 then
+            return false
+          end
+        end
+      end
+    end
+  end
+  return true
+end
+
+local function near(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 2, s("assertion.internal.argtolittle", { "near", 3, tostring(argcnt) }), level)
+  local expected = tonumber(arguments[1])
+  local actual = tonumber(arguments[2])
+  local tolerance = tonumber(arguments[3])
+  local numbertype = "number or object convertible to a number"
+  assert(expected, s("assertion.internal.badargtype", { 1, "near", numbertype, format(arguments[1]) }), level)
+  assert(actual, s("assertion.internal.badargtype", { 2, "near", numbertype, format(arguments[2]) }), level)
+  assert(tolerance, s("assertion.internal.badargtype", { 3, "near", numbertype, format(arguments[3]) }), level)
+  -- switch arguments for proper output message
+  util.tinsert(arguments, 1, util.tremove(arguments, 2))
+  arguments[3] = tolerance
+  arguments.nofmt = arguments.nofmt or {}
+  arguments.nofmt[3] = true
+  set_failure_message(state, arguments[4])
+  return (actual >= expected - tolerance and actual <= expected + tolerance)
+end
+
+local function matches(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 1, s("assertion.internal.argtolittle", { "matches", 2, tostring(argcnt) }), level)
+  local pattern = arguments[1]
+  local actual = nil
+  if util.hastostring(arguments[2]) or type(arguments[2]) == "number" then
+    actual = tostring(arguments[2])
+  end
+  local err_message
+  local init_arg_num = 3
+  for i=3,argcnt,1 do
+    if arguments[i] and type(arguments[i]) ~= "boolean" and not tonumber(arguments[i]) then
+      if i == 3 then init_arg_num = init_arg_num + 1 end
+      err_message = util.tremove(arguments, i)
+      break
+    end
+  end
+  local init = arguments[3]
+  local plain = arguments[4]
+  local stringtype = "string or object convertible to a string"
+  assert(type(pattern) == "string", s("assertion.internal.badargtype", { 1, "matches", "string", type(arguments[1]) }), level)
+  assert(actual, s("assertion.internal.badargtype", { 2, "matches", stringtype, format(arguments[2]) }), level)
+  assert(init == nil or tonumber(init), s("assertion.internal.badargtype", { init_arg_num, "matches", "number", type(arguments[3]) }), level)
+  -- switch arguments for proper output message
+  util.tinsert(arguments, 1, util.tremove(arguments, 2))
+  set_failure_message(state, err_message)
+  local retargs
+  local ok
+  if plain then
+    ok = (actual:find(pattern, init, plain) ~= nil)
+    retargs = ok and { pattern } or {}
+  else
+    retargs = { actual:match(pattern, init) }
+    ok = (retargs[1] ~= nil)
+  end
+  return ok, retargs
+end
+
+local function equals(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 1, s("assertion.internal.argtolittle", { "equals", 2, tostring(argcnt) }), level)
+  local result =  arguments[1] == arguments[2]
+  -- switch arguments for proper output message
+  util.tinsert(arguments, 1, util.tremove(arguments, 2))
+  set_failure_message(state, arguments[3])
+  return result
+end
+
+local function same(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 1, s("assertion.internal.argtolittle", { "same", 2, tostring(argcnt) }), level)
+  if type(arguments[1]) == 'table' and type(arguments[2]) == 'table' then
+    local result, crumbs = util.deepcompare(arguments[1], arguments[2], true)
+    -- switch arguments for proper output message
+    util.tinsert(arguments, 1, util.tremove(arguments, 2))
+    arguments.fmtargs = arguments.fmtargs or {}
+    arguments.fmtargs[1] = { crumbs = crumbs }
+    arguments.fmtargs[2] = { crumbs = crumbs }
+    set_failure_message(state, arguments[3])
+    return result
+  end
+  local result = arguments[1] == arguments[2]
+  -- switch arguments for proper output message
+  util.tinsert(arguments, 1, util.tremove(arguments, 2))
+  set_failure_message(state, arguments[3])
+  return result
+end
+
+local function truthy(state, arguments, level)
+  local argcnt = arguments.n
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "truthy", 1, tostring(argcnt) }), level)
+  set_failure_message(state, arguments[2])
+  return arguments[1] ~= false and arguments[1] ~= nil
+end
+
+local function falsy(state, arguments, level)
+  local argcnt = arguments.n
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "falsy", 1, tostring(argcnt) }), level)
+  return not truthy(state, arguments, level)
+end
+
+local function has_error(state, arguments, level)
+  local level = (level or 1) + 1
+  local retargs = util.shallowcopy(arguments)
+  local func = arguments[1]
+  local err_expected = arguments[2]
+  local failure_message = arguments[3]
+  assert(util.callable(func), s("assertion.internal.badargtype", { 1, "error", "function or callable object", type(func) }), level)
+  local ok, err_actual = pcall(func)
+  if type(err_actual) == 'string' then
+    -- remove 'path/to/file:line: ' from string
+    err_actual = err_actual:gsub('^.-:%d+: ', '', 1)
+  end
+  retargs[1] = err_actual
+  arguments.nofmt = {}
+  arguments.n = 2
+  arguments[1] = (ok and '(no error)' or err_actual)
+  arguments[2] = (err_expected == nil and '(error)' or err_expected)
+  arguments.nofmt[1] = ok
+  arguments.nofmt[2] = (err_expected == nil)
+  set_failure_message(state, failure_message)
+
+  if ok or err_expected == nil then
+    return not ok, retargs
+  end
+  if type(err_expected) == 'string' then
+    -- err_actual must be (convertible to) a string
+    if util.hastostring(err_actual) then
+      err_actual = tostring(err_actual)
+      retargs[1] = err_actual
+    end
+    if type(err_actual) == 'string' then
+      return err_expected == err_actual, retargs
+    end
+  elseif type(err_expected) == 'number' then
+    if type(err_actual) == 'string' then
+      return tostring(err_expected) == tostring(tonumber(err_actual)), retargs
+    end
+  end
+  return same(state, {err_expected, err_actual, ["n"] = 2}), retargs
+end
+
+local function error_matches(state, arguments, level)
+  local level = (level or 1) + 1
+  local retargs = util.shallowcopy(arguments)
+  local argcnt = arguments.n
+  local func = arguments[1]
+  local pattern = arguments[2]
+  assert(argcnt > 1, s("assertion.internal.argtolittle", { "error_matches", 2, tostring(argcnt) }), level)
+  assert(util.callable(func), s("assertion.internal.badargtype", { 1, "error_matches", "function or callable object", type(func) }), level)
+  assert(pattern == nil or type(pattern) == "string", s("assertion.internal.badargtype", { 2, "error", "string", type(pattern) }), level)
+
+  local failure_message
+  local init_arg_num = 3
+  for i=3,argcnt,1 do
+    if arguments[i] and type(arguments[i]) ~= "boolean" and not tonumber(arguments[i]) then
+      if i == 3 then init_arg_num = init_arg_num + 1 end
+      failure_message = util.tremove(arguments, i)
+      break
+    end
+  end
+  local init = arguments[3]
+  local plain = arguments[4]
+  assert(init == nil or tonumber(init), s("assertion.internal.badargtype", { init_arg_num, "matches", "number", type(arguments[3]) }), level)
+
+  local ok, err_actual = pcall(func)
+  if type(err_actual) == 'string' then
+    -- remove 'path/to/file:line: ' from string
+    err_actual = err_actual:gsub('^.-:%d+: ', '', 1)
+  end
+  retargs[1] = err_actual
+  arguments.nofmt = {}
+  arguments.n = 2
+  arguments[1] = (ok and '(no error)' or err_actual)
+  arguments[2] = pattern
+  arguments.nofmt[1] = ok
+  arguments.nofmt[2] = false
+  set_failure_message(state, failure_message)
+
+  if ok then return not ok, retargs end
+  if err_actual == nil and pattern == nil then
+    return true, {}
+  end
+
+  -- err_actual must be (convertible to) a string
+  if util.hastostring(err_actual) or
+     type(err_actual) == "number" or
+     type(err_actual) == "boolean" then
+    err_actual = tostring(err_actual)
+    retargs[1] = err_actual
+  end
+  if type(err_actual) == 'string' then
+    local ok
+    local retargs_ok
+    if plain then
+      retargs_ok = { pattern }
+      ok = (err_actual:find(pattern, init, plain) ~= nil)
+    else
+      retargs_ok = { err_actual:match(pattern, init) }
+      ok = (retargs_ok[1] ~= nil)
+    end
+    if ok then retargs = retargs_ok end
+    return ok, retargs
+  end
+
+  return false, retargs
+end
+
+local function is_true(state, arguments, level)
+  util.tinsert(arguments, 2, true)
+  set_failure_message(state, arguments[3])
+  return arguments[1] == arguments[2]
+end
+
+local function is_false(state, arguments, level)
+  util.tinsert(arguments, 2, false)
+  set_failure_message(state, arguments[3])
+  return arguments[1] == arguments[2]
+end
+
+local function is_type(state, arguments, level, etype)
+  util.tinsert(arguments, 2, "type " .. etype)
+  arguments.nofmt = arguments.nofmt or {}
+  arguments.nofmt[2] = true
+  set_failure_message(state, arguments[3])
+  return arguments.n > 1 and type(arguments[1]) == etype
+end
+
+local function returned_arguments(state, arguments, level)
+  arguments[1] = tostring(arguments[1])
+  arguments[2] = tostring(arguments.n - 1)
+  arguments.nofmt = arguments.nofmt or {}
+  arguments.nofmt[1] = true
+  arguments.nofmt[2] = true
+  if arguments.n < 2 then arguments.n = 2 end
+  return arguments[1] == arguments[2]
+end
+
+local function set_message(state, arguments, level)
+  state.failure_message = arguments[1]
+end
+
+local function is_boolean(state, arguments, level)  return is_type(state, arguments, level, "boolean")  end
+local function is_number(state, arguments, level)   return is_type(state, arguments, level, "number")   end
+local function is_string(state, arguments, level)   return is_type(state, arguments, level, "string")   end
+local function is_table(state, arguments, level)    return is_type(state, arguments, level, "table")    end
+local function is_nil(state, arguments, level)      return is_type(state, arguments, level, "nil")      end
+local function is_userdata(state, arguments, level) return is_type(state, arguments, level, "userdata") end
+local function is_function(state, arguments, level) return is_type(state, arguments, level, "function") end
+local function is_thread(state, arguments, level)   return is_type(state, arguments, level, "thread")   end
+
+assert:register("modifier", "message", set_message)
+assert:register("assertion", "true", is_true, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "false", is_false, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "boolean", is_boolean, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "number", is_number, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "string", is_string, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "table", is_table, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "nil", is_nil, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "userdata", is_userdata, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "function", is_function, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "thread", is_thread, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "returned_arguments", returned_arguments, "assertion.returned_arguments.positive", "assertion.returned_arguments.negative")
+
+assert:register("assertion", "same", same, "assertion.same.positive", "assertion.same.negative")
+assert:register("assertion", "matches", matches, "assertion.matches.positive", "assertion.matches.negative")
+assert:register("assertion", "match", matches, "assertion.matches.positive", "assertion.matches.negative")
+assert:register("assertion", "near", near, "assertion.near.positive", "assertion.near.negative")
+assert:register("assertion", "equals", equals, "assertion.equals.positive", "assertion.equals.negative")
+assert:register("assertion", "equal", equals, "assertion.equals.positive", "assertion.equals.negative")
+assert:register("assertion", "unique", unique, "assertion.unique.positive", "assertion.unique.negative")
+assert:register("assertion", "error", has_error, "assertion.error.positive", "assertion.error.negative")
+assert:register("assertion", "errors", has_error, "assertion.error.positive", "assertion.error.negative")
+assert:register("assertion", "error_matches", error_matches, "assertion.error.positive", "assertion.error.negative")
+assert:register("assertion", "error_match", error_matches, "assertion.error.positive", "assertion.error.negative")
+assert:register("assertion", "matches_error", error_matches, "assertion.error.positive", "assertion.error.negative")
+assert:register("assertion", "match_error", error_matches, "assertion.error.positive", "assertion.error.negative")
+assert:register("assertion", "truthy", truthy, "assertion.truthy.positive", "assertion.truthy.negative")
+assert:register("assertion", "falsy", falsy, "assertion.falsy.positive", "assertion.falsy.negative")

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/compatibility.lua

@@ -0,0 +1,9 @@
+-- no longer needed, only for backward compatibility
+local unpack = require ("luassert.util").unpack
+
+return {
+  unpack = function(...)
+    print(debug.traceback("WARN: calling deprecated function 'luassert.compatibility.unpack' use 'luassert.util.unpack' instead"))
+    return unpack(...)
+  end
+}

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/formatters/binarystring.lua

@@ -0,0 +1,28 @@
+local format = function (str)
+  if type(str) ~= "string" then return nil end
+  local result = "Binary string length; " .. tostring(#str) .. " bytes\n"
+  local i = 1
+  local hex = ""
+  local chr = ""
+  while i <= #str do
+    local byte = str:byte(i)
+    hex = string.format("%s%2x ", hex, byte)
+    if byte < 32 then byte = string.byte(".") end
+    chr = chr .. string.char(byte)
+    if math.floor(i/16) == i/16 or i == #str then
+      -- reached end of line
+      hex = hex .. string.rep(" ", 16 * 3 - #hex)
+      chr = chr .. string.rep(" ", 16 - #chr)
+
+      result = result .. hex:sub(1, 8 * 3) .. "  " .. hex:sub(8*3+1, -1) .. " " .. chr:sub(1,8) .. " " .. chr:sub(9,-1) .. "\n"
+
+      hex = ""
+      chr = ""
+    end
+    i = i + 1
+  end
+  return result
+end
+
+return format
+

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/formatters/init.lua

@@ -0,0 +1,255 @@
+-- module will not return anything, only register formatters with the main assert engine
+local assert = require('luassert.assert')
+local match = require('luassert.match')
+local util = require('luassert.util')
+
+local isatty, colors do
+  local ok, term = pcall(require, 'term')
+  isatty = io.type(io.stdout) == 'file' and ok and term.isatty(io.stdout)
+  if not isatty then
+    local isWindows = package.config:sub(1,1) == '\\'
+    if isWindows and os.getenv("ANSICON") then
+      isatty = true
+    end
+  end
+
+  colors = setmetatable({
+    none = function(c) return c end
+  },{ __index = function(self, key)
+    return function(c)
+      for token in key:gmatch("[^%.]+") do
+        c = term.colors[token](c)
+      end
+      return c
+    end
+  end
+  })
+end
+
+local function fmt_string(arg)
+  if type(arg) == "string" then
+    return string.format("(string) '%s'", arg)
+  end
+end
+
+-- A version of tostring which formats numbers more precisely.
+local function tostr(arg)
+  if type(arg) ~= "number" then
+    return tostring(arg)
+  end
+
+  if arg ~= arg then
+    return "NaN"
+  elseif arg == 1/0 then
+    return "Inf"
+  elseif arg == -1/0 then
+    return "-Inf"
+  end
+
+  local str = string.format("%.20g", arg)
+
+  if math.type and math.type(arg) == "float" and not str:find("[%.,]") then
+    -- Number is a float but looks like an integer.
+    -- Insert ".0" after first run of digits.
+    str = str:gsub("%d+", "%0.0", 1)
+  end
+
+  return str
+end
+
+local function fmt_number(arg)
+  if type(arg) == "number" then
+    return string.format("(number) %s", tostr(arg))
+  end
+end
+
+local function fmt_boolean(arg)
+  if type(arg) == "boolean" then
+    return string.format("(boolean) %s", tostring(arg))
+  end
+end
+
+local function fmt_nil(arg)
+  if type(arg) == "nil" then
+    return "(nil)"
+  end
+end
+
+local type_priorities = {
+  number = 1,
+  boolean = 2,
+  string = 3,
+  table = 4,
+  ["function"] = 5,
+  userdata = 6,
+  thread = 7
+}
+
+local function is_in_array_part(key, length)
+  return type(key) == "number" and 1 <= key and key <= length and math.floor(key) == key
+end
+
+local function get_sorted_keys(t)
+  local keys = {}
+  local nkeys = 0
+
+  for key in pairs(t) do
+    nkeys = nkeys + 1
+    keys[nkeys] = key
+  end
+
+  local length = #t
+
+  local function key_comparator(key1, key2)
+    local type1, type2 = type(key1), type(key2)
+    local priority1 = is_in_array_part(key1, length) and 0 or type_priorities[type1] or 8
+    local priority2 = is_in_array_part(key2, length) and 0 or type_priorities[type2] or 8
+
+    if priority1 == priority2 then
+      if type1 == "string" or type1 == "number" then
+        return key1 < key2
+      elseif type1 == "boolean" then
+        return key1  -- put true before false
+      end
+    else
+      return priority1 < priority2
+    end
+  end
+
+  table.sort(keys, key_comparator)
+  return keys, nkeys
+end
+
+local function fmt_table(arg, fmtargs)
+  if type(arg) ~= "table" then
+    return
+  end
+
+  local tmax = assert:get_parameter("TableFormatLevel")
+  local showrec = assert:get_parameter("TableFormatShowRecursion")
+  local errchar = assert:get_parameter("TableErrorHighlightCharacter") or ""
+  local errcolor = assert:get_parameter("TableErrorHighlightColor")
+  local crumbs = fmtargs and fmtargs.crumbs or {}
+  local cache = {}
+  local type_desc
+
+  if getmetatable(arg) == nil then
+    type_desc = "(" .. tostring(arg) .. ") "
+  elseif not pcall(setmetatable, arg, getmetatable(arg)) then
+    -- cannot set same metatable, so it is protected, skip id
+    type_desc = "(table) "
+  else
+    -- unprotected metatable, temporary remove the mt
+    local mt = getmetatable(arg)
+    setmetatable(arg, nil)
+    type_desc = "(" .. tostring(arg) .. ") "
+    setmetatable(arg, mt)
+  end
+
+  local function ft(t, l, with_crumbs)
+    if showrec and cache[t] and cache[t] > 0 then
+      return "{ ... recursive }"
+    end
+
+    if next(t) == nil then
+      return "{ }"
+    end
+
+    if l > tmax and tmax >= 0 then
+      return "{ ... more }"
+    end
+
+    local result = "{"
+    local keys, nkeys = get_sorted_keys(t)
+
+    cache[t] = (cache[t] or 0) + 1
+    local crumb = crumbs[#crumbs - l + 1]
+
+    for i = 1, nkeys do
+      local k = keys[i]
+      local v = t[k]
+      local use_crumbs = with_crumbs and k == crumb
+
+      if type(v) == "table" then
+        v = ft(v, l + 1, use_crumbs)
+      elseif type(v) == "string" then
+        v = "'"..v.."'"
+      end
+
+      local ch = use_crumbs and errchar or ""
+      local indent = string.rep(" ",l * 2 - ch:len())
+      local mark = (ch:len() == 0 and "" or colors[errcolor](ch))
+      result = result .. string.format("\n%s%s[%s] = %s", indent, mark, tostr(k), tostr(v))
+    end
+
+    cache[t] = cache[t] - 1
+
+    return result .. " }"
+  end
+
+  return type_desc .. ft(arg, 1, true)
+end
+
+local function fmt_function(arg)
+  if type(arg) == "function" then
+    local debug_info = debug.getinfo(arg)
+    return string.format("%s @ line %s in %s", tostring(arg), tostring(debug_info.linedefined), tostring(debug_info.source))
+  end
+end
+
+local function fmt_userdata(arg)
+  if type(arg) == "userdata" then
+    return string.format("(userdata) '%s'", tostring(arg))
+  end
+end
+
+local function fmt_thread(arg)
+  if type(arg) == "thread" then
+    return string.format("(thread) '%s'", tostring(arg))
+  end
+end
+
+local function fmt_matcher(arg)
+  if not match.is_matcher(arg) then
+    return
+  end
+  local not_inverted = {
+    [true] = "is.",
+    [false] = "no.",
+  }
+  local args = {}
+  for idx = 1, arg.arguments.n do
+    table.insert(args, assert:format({ arg.arguments[idx], n = 1, })[1])
+  end
+  return string.format("(matcher) %s%s(%s)",
+                       not_inverted[arg.mod],
+                       tostring(arg.name),
+                       table.concat(args, ", "))
+end
+
+local function fmt_arglist(arglist)
+  if not util.is_arglist(arglist) then
+    return
+  end
+  local formatted_vals = {}
+  for idx = 1, arglist.n do
+    table.insert(formatted_vals, assert:format({ arglist[idx], n = 1, })[1])
+  end
+  return "(values list) (" .. table.concat(formatted_vals, ", ") .. ")"
+end
+
+assert:add_formatter(fmt_string)
+assert:add_formatter(fmt_number)
+assert:add_formatter(fmt_boolean)
+assert:add_formatter(fmt_nil)
+assert:add_formatter(fmt_table)
+assert:add_formatter(fmt_function)
+assert:add_formatter(fmt_userdata)
+assert:add_formatter(fmt_thread)
+assert:add_formatter(fmt_matcher)
+assert:add_formatter(fmt_arglist)
+-- Set default table display depth for table formatter
+assert:set_parameter("TableFormatLevel", 3)
+assert:set_parameter("TableFormatShowRecursion", false)
+assert:set_parameter("TableErrorHighlightCharacter", "*")
+assert:set_parameter("TableErrorHighlightColor", isatty and "red" or "none")

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/init.lua

@@ -0,0 +1,17 @@
+local assert = require('luassert.assert')
+
+assert._COPYRIGHT   = "Copyright (c) 2018 Olivine Labs, LLC."
+assert._DESCRIPTION = "Extends Lua's built-in assertions to provide additional tests and the ability to create your own."
+assert._VERSION     = "Luassert 1.8.0"
+
+-- load basic asserts
+require('luassert.assertions')
+require('luassert.modifiers')
+require('luassert.array')
+require('luassert.matchers')
+require('luassert.formatters')
+
+-- load default language
+require('luassert.languages.en')
+
+return assert

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/languages/en.lua

@@ -0,0 +1,48 @@
+local s = require('say')
+
+s:set_namespace('en')
+
+s:set("assertion.same.positive", "Expected objects to be the same.\nPassed in:\n%s\nExpected:\n%s")
+s:set("assertion.same.negative", "Expected objects to not be the same.\nPassed in:\n%s\nDid not expect:\n%s")
+
+s:set("assertion.equals.positive", "Expected objects to be equal.\nPassed in:\n%s\nExpected:\n%s")
+s:set("assertion.equals.negative", "Expected objects to not be equal.\nPassed in:\n%s\nDid not expect:\n%s")
+
+s:set("assertion.near.positive", "Expected values to be near.\nPassed in:\n%s\nExpected:\n%s +/- %s")
+s:set("assertion.near.negative", "Expected values to not be near.\nPassed in:\n%s\nDid not expect:\n%s +/- %s")
+
+s:set("assertion.matches.positive", "Expected strings to match.\nPassed in:\n%s\nExpected:\n%s")
+s:set("assertion.matches.negative", "Expected strings not to match.\nPassed in:\n%s\nDid not expect:\n%s")
+
+s:set("assertion.unique.positive", "Expected object to be unique:\n%s")
+s:set("assertion.unique.negative", "Expected object to not be unique:\n%s")
+
+s:set("assertion.error.positive", "Expected a different error.\nCaught:\n%s\nExpected:\n%s")
+s:set("assertion.error.negative", "Expected no error, but caught:\n%s")
+
+s:set("assertion.truthy.positive", "Expected to be truthy, but value was:\n%s")
+s:set("assertion.truthy.negative", "Expected to not be truthy, but value was:\n%s")
+
+s:set("assertion.falsy.positive", "Expected to be falsy, but value was:\n%s")
+s:set("assertion.falsy.negative", "Expected to not be falsy, but value was:\n%s")
+
+s:set("assertion.called.positive", "Expected to be called %s time(s), but was called %s time(s)")
+s:set("assertion.called.negative", "Expected not to be called exactly %s time(s), but it was.")
+
+s:set("assertion.called_at_least.positive", "Expected to be called at least %s time(s), but was called %s time(s)")
+s:set("assertion.called_at_most.positive", "Expected to be called at most %s time(s), but was called %s time(s)")
+s:set("assertion.called_more_than.positive", "Expected to be called more than %s time(s), but was called %s time(s)")
+s:set("assertion.called_less_than.positive", "Expected to be called less than %s time(s), but was called %s time(s)")
+
+s:set("assertion.called_with.positive", "Function was never called with matching arguments.\nCalled with (last call if any):\n%s\nExpected:\n%s")
+s:set("assertion.called_with.negative", "Function was called with matching arguments at least once.\nCalled with (last matching call):\n%s\nDid not expect:\n%s")
+
+s:set("assertion.returned_with.positive", "Function never returned matching arguments.\nReturned (last call if any):\n%s\nExpected:\n%s")
+s:set("assertion.returned_with.negative", "Function returned matching arguments at least once.\nReturned (last matching call):\n%s\nDid not expect:\n%s")
+
+s:set("assertion.returned_arguments.positive", "Expected to be called with %s argument(s), but was called with %s")
+s:set("assertion.returned_arguments.negative", "Expected not to be called with %s argument(s), but was called with %s")
+
+-- errors
+s:set("assertion.internal.argtolittle", "the '%s' function requires a minimum of %s arguments, got: %s")
+s:set("assertion.internal.badargtype", "bad argument #%s to '%s' (%s expected, got %s)")

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/match.lua

@@ -0,0 +1,79 @@
+local namespace = require 'luassert.namespaces'
+local util = require 'luassert.util'
+
+local matcher_mt = {
+  __call = function(self, value)
+    return self.callback(value) == self.mod
+  end,
+}
+
+local state_mt = {
+  __call = function(self, ...)
+    local keys = util.extract_keys("matcher", self.tokens)
+    self.tokens = {}
+
+    local matcher
+
+    for _, key in ipairs(keys) do
+      matcher = namespace.matcher[key] or matcher
+    end
+
+    if matcher then
+      for _, key in ipairs(keys) do
+        if namespace.modifier[key] then
+          namespace.modifier[key].callback(self)
+        end
+      end
+
+      local arguments = util.make_arglist(...)
+      local matches = matcher.callback(self, arguments, util.errorlevel())
+      return setmetatable({
+        name = matcher.name,
+        mod = self.mod,
+        callback = matches,
+        arguments = arguments,
+      }, matcher_mt)
+    else
+      local arguments = util.make_arglist(...)
+
+      for _, key in ipairs(keys) do
+        if namespace.modifier[key] then
+          namespace.modifier[key].callback(self, arguments, util.errorlevel())
+        end
+      end
+    end
+
+    return self
+  end,
+
+  __index = function(self, key)
+    for token in key:lower():gmatch('[^_]+') do
+      table.insert(self.tokens, token)
+    end
+
+    return self
+  end
+}
+
+local match = {
+  _ = setmetatable({mod=true, callback=function() return true end}, matcher_mt),
+
+  state = function() return setmetatable({mod=true, tokens={}}, state_mt) end,
+
+  is_matcher = function(object)
+    return type(object) == "table" and getmetatable(object) == matcher_mt
+  end,
+
+  is_ref_matcher = function(object)
+    local ismatcher = (type(object) == "table" and getmetatable(object) == matcher_mt)
+    return ismatcher and object.name == "ref"
+  end,
+}
+
+local mt = {
+  __index = function(self, key)
+    return rawget(self, key) or self.state()[key]
+  end,
+}
+
+return setmetatable(match, mt)

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/matchers/composite.lua

@@ -0,0 +1,61 @@
+local assert = require('luassert.assert')
+local match = require ('luassert.match')
+local s = require('say')
+
+local function none(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "none", 1, tostring(argcnt) }), level)
+  for i = 1, argcnt do
+    assert(match.is_matcher(arguments[i]), s("assertion.internal.badargtype", { 1, "none", "matcher", type(arguments[i]) }), level)
+  end
+
+  return function(value)
+    for _, matcher in ipairs(arguments) do
+      if matcher(value) then
+        return false
+      end
+    end
+    return true
+  end
+end
+
+local function any(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "any", 1, tostring(argcnt) }), level)
+  for i = 1, argcnt do
+    assert(match.is_matcher(arguments[i]), s("assertion.internal.badargtype", { 1, "any", "matcher", type(arguments[i]) }), level)
+  end
+
+  return function(value)
+    for _, matcher in ipairs(arguments) do
+      if matcher(value) then
+        return true
+      end
+    end
+    return false
+  end
+end
+
+local function all(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "all", 1, tostring(argcnt) }), level)
+  for i = 1, argcnt do
+    assert(match.is_matcher(arguments[i]), s("assertion.internal.badargtype", { 1, "all", "matcher", type(arguments[i]) }), level)
+  end
+
+  return function(value)
+    for _, matcher in ipairs(arguments) do
+      if not matcher(value) then
+        return false
+      end
+    end
+    return true
+  end
+end
+
+assert:register("matcher", "none_of", none)
+assert:register("matcher", "any_of", any)
+assert:register("matcher", "all_of", all)

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/matchers/core.lua

@@ -0,0 +1,173 @@
+-- module will return the list of matchers, and registers matchers with the main assert engine
+
+-- matchers take 1 parameters;
+-- 1) state
+-- 2) arguments list. The list has a member 'n' with the argument count to check for trailing nils
+-- 3) level The level of the error position relative to the called function
+-- returns; function (or callable object); a function that, given an argument, returns a boolean
+
+local assert = require('luassert.assert')
+local astate = require('luassert.state')
+local util = require('luassert.util')
+local s = require('say')
+
+local function format(val)
+  return astate.format_argument(val) or tostring(val)
+end
+
+local function unique(state, arguments, level)
+  local deep = arguments[1]
+  return function(value)
+    local list = value
+    for k,v in pairs(list) do
+      for k2, v2 in pairs(list) do
+        if k ~= k2 then
+          if deep and util.deepcompare(v, v2, true) then
+            return false
+          else
+            if v == v2 then
+              return false
+            end
+          end
+        end
+      end
+    end
+    return true
+  end
+end
+
+local function near(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 1, s("assertion.internal.argtolittle", { "near", 2, tostring(argcnt) }), level)
+  local expected = tonumber(arguments[1])
+  local tolerance = tonumber(arguments[2])
+  local numbertype = "number or object convertible to a number"
+  assert(expected, s("assertion.internal.badargtype", { 1, "near", numbertype, format(arguments[1]) }), level)
+  assert(tolerance, s("assertion.internal.badargtype", { 2, "near", numbertype, format(arguments[2]) }), level)
+
+  return function(value)
+    local actual = tonumber(value)
+    if not actual then return false end
+    return (actual >= expected - tolerance and actual <= expected + tolerance)
+  end
+end
+
+local function matches(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "matches", 1, tostring(argcnt) }), level)
+  local pattern = arguments[1]
+  local init = arguments[2]
+  local plain = arguments[3]
+  assert(type(pattern) == "string", s("assertion.internal.badargtype", { 1, "matches", "string", type(arguments[1]) }), level)
+  assert(init == nil or tonumber(init), s("assertion.internal.badargtype", { 2, "matches", "number", type(arguments[2]) }), level)
+
+  return function(value)
+    local actualtype = type(value)
+    local actual = nil
+    if actualtype == "string" or actualtype == "number" or
+      actualtype == "table" and (getmetatable(value) or {}).__tostring then
+      actual = tostring(value)
+    end
+    if not actual then return false end
+    return (actual:find(pattern, init, plain) ~= nil)
+  end
+end
+
+local function equals(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "equals", 1, tostring(argcnt) }), level)
+  return function(value)
+    return value == arguments[1]
+  end
+end
+
+local function same(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "same", 1, tostring(argcnt) }), level)
+  return function(value)
+    if type(value) == 'table' and type(arguments[1]) == 'table' then
+      local result = util.deepcompare(value, arguments[1], true)
+      return result
+    end
+    return value == arguments[1]
+  end
+end
+
+local function ref(state, arguments, level)
+  local level = (level or 1) + 1
+  local argcnt = arguments.n
+  local argtype = type(arguments[1])
+  local isobject = (argtype == "table" or argtype == "function" or argtype == "thread" or argtype == "userdata")
+  assert(argcnt > 0, s("assertion.internal.argtolittle", { "ref", 1, tostring(argcnt) }), level)
+  assert(isobject, s("assertion.internal.badargtype", { 1, "ref", "object", argtype }), level)
+  return function(value)
+    return value == arguments[1]
+  end
+end
+
+local function is_true(state, arguments, level)
+  return function(value)
+    return value == true
+  end
+end
+
+local function is_false(state, arguments, level)
+  return function(value)
+    return value == false
+  end
+end
+
+local function truthy(state, arguments, level)
+  return function(value)
+    return value ~= false and value ~= nil
+  end
+end
+
+local function falsy(state, arguments, level)
+  local is_truthy = truthy(state, arguments, level)
+  return function(value)
+    return not is_truthy(value)
+  end
+end
+
+local function is_type(state, arguments, level, etype)
+  return function(value)
+    return type(value) == etype
+  end
+end
+
+local function is_nil(state, arguments, level)      return is_type(state, arguments, level, "nil")      end
+local function is_boolean(state, arguments, level)  return is_type(state, arguments, level, "boolean")  end
+local function is_number(state, arguments, level)   return is_type(state, arguments, level, "number")   end
+local function is_string(state, arguments, level)   return is_type(state, arguments, level, "string")   end
+local function is_table(state, arguments, level)    return is_type(state, arguments, level, "table")    end
+local function is_function(state, arguments, level) return is_type(state, arguments, level, "function") end
+local function is_userdata(state, arguments, level) return is_type(state, arguments, level, "userdata") end
+local function is_thread(state, arguments, level)   return is_type(state, arguments, level, "thread")   end
+
+assert:register("matcher", "true", is_true)
+assert:register("matcher", "false", is_false)
+
+assert:register("matcher", "nil", is_nil)
+assert:register("matcher", "boolean", is_boolean)
+assert:register("matcher", "number", is_number)
+assert:register("matcher", "string", is_string)
+assert:register("matcher", "table", is_table)
+assert:register("matcher", "function", is_function)
+assert:register("matcher", "userdata", is_userdata)
+assert:register("matcher", "thread", is_thread)
+
+assert:register("matcher", "ref", ref)
+assert:register("matcher", "same", same)
+assert:register("matcher", "matches", matches)
+assert:register("matcher", "match", matches)
+assert:register("matcher", "near", near)
+assert:register("matcher", "equals", equals)
+assert:register("matcher", "equal", equals)
+assert:register("matcher", "unique", unique)
+assert:register("matcher", "truthy", truthy)
+assert:register("matcher", "falsy", falsy)

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/matchers/init.lua

@@ -0,0 +1,3 @@
+-- load basic machers
+require('luassert.matchers.core')
+require('luassert.matchers.composite')

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/mock.lua

@@ -0,0 +1,61 @@
+-- module will return a mock module table, and will not register any assertions
+local spy = require 'luassert.spy'
+local stub = require 'luassert.stub'
+
+local function mock_apply(object, action)
+  if type(object) ~= "table" then return end
+  if spy.is_spy(object) then
+    return object[action](object)
+  end
+  for k,v in pairs(object) do
+    mock_apply(v, action)
+  end
+  return object
+end
+
+local mock
+mock = {
+  new = function(object, dostub, func, self, key)
+    local visited = {}
+    local function do_mock(object, self, key)
+      local mock_handlers = {
+        ["table"] = function()
+          if spy.is_spy(object) or visited[object] then return end
+          visited[object] = true
+          for k,v in pairs(object) do
+            object[k] = do_mock(v, object, k)
+          end
+          return object
+        end,
+        ["function"] = function()
+          if dostub then
+            return stub(self, key, func)
+          elseif self==nil then
+            return spy.new(object)
+          else
+            return spy.on(self, key)
+          end
+        end
+      }
+      local handler = mock_handlers[type(object)]
+      return handler and handler() or object
+    end
+    return do_mock(object, self, key)
+  end,
+
+  clear = function(object)
+    return mock_apply(object, "clear")
+  end,
+
+  revert = function(object)
+    return mock_apply(object, "revert")
+  end
+}
+
+return setmetatable(mock, {
+  __call = function(self, ...)
+    -- mock originally was a function only. Now that it is a module table
+    -- the __call method is required for backward compatibility
+    return mock.new(...)
+  end
+})

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/modifiers.lua

@@ -0,0 +1,19 @@
+-- module will not return anything, only register assertions/modifiers with the main assert engine
+local assert = require('luassert.assert')
+
+local function is(state)
+  return state
+end
+
+local function is_not(state)
+  state.mod = not state.mod
+  return state
+end
+
+assert:register("modifier", "is", is)
+assert:register("modifier", "are", is)
+assert:register("modifier", "was", is)
+assert:register("modifier", "has", is)
+assert:register("modifier", "does", is)
+assert:register("modifier", "not", is_not)
+assert:register("modifier", "no", is_not)

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/namespaces.lua

@@ -0,0 +1,2 @@
+-- stores the list of namespaces
+return {}

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/spy.lua

@@ -0,0 +1,195 @@
+-- module will return spy table, and register its assertions with the main assert engine
+local assert = require('luassert.assert')
+local util = require('luassert.util')
+
+-- Spy metatable
+local spy_mt = {
+  __call = function(self, ...)
+    local arguments = util.make_arglist(...)
+    table.insert(self.calls, util.copyargs(arguments))
+    local function get_returns(...)
+      local returnvals = util.make_arglist(...)
+      table.insert(self.returnvals, util.copyargs(returnvals))
+      return ...
+    end
+    return get_returns(self.callback(...))
+  end
+}
+
+local spy   -- must make local before defining table, because table contents refers to the table (recursion)
+spy = {
+  new = function(callback)
+    callback = callback or function() end
+    if not util.callable(callback) then
+      error("Cannot spy on type '" .. type(callback) .. "', only on functions or callable elements", util.errorlevel())
+    end
+    local s = setmetatable({
+      calls = {},
+      returnvals = {},
+      callback = callback,
+
+      target_table = nil, -- these will be set when using 'spy.on'
+      target_key = nil,
+
+      revert = function(self)
+        if not self.reverted then
+          if self.target_table and self.target_key then
+            self.target_table[self.target_key] = self.callback
+          end
+          self.reverted = true
+        end
+        return self.callback
+      end,
+
+      clear = function(self)
+        self.calls = {}
+        self.returnvals = {}
+        return self
+      end,
+
+      called = function(self, times, compare)
+        if times or compare then
+          local compare = compare or function(count, expected) return count == expected end
+          return compare(#self.calls, times), #self.calls
+        end
+
+        return (#self.calls > 0), #self.calls
+      end,
+
+      called_with = function(self, args)
+        local last_arglist = nil
+        if #self.calls > 0 then
+          last_arglist = self.calls[#self.calls].vals
+        end
+        local matching_arglists = util.matchargs(self.calls, args)
+        if matching_arglists ~= nil then
+          return true, matching_arglists.vals
+        end
+        return false, last_arglist
+      end,
+
+      returned_with = function(self, args)
+        local last_returnvallist = nil
+        if #self.returnvals > 0 then
+          last_returnvallist = self.returnvals[#self.returnvals].vals
+        end
+        local matching_returnvallists = util.matchargs(self.returnvals, args)
+        if matching_returnvallists ~= nil then
+          return true, matching_returnvallists.vals
+        end
+        return false, last_returnvallist
+      end
+    }, spy_mt)
+    assert:add_spy(s)  -- register with the current state
+    return s
+  end,
+
+  is_spy = function(object)
+    return type(object) == "table" and getmetatable(object) == spy_mt
+  end,
+
+  on = function(target_table, target_key)
+    local s = spy.new(target_table[target_key])
+    target_table[target_key] = s
+    -- store original data
+    s.target_table = target_table
+    s.target_key = target_key
+
+    return s
+  end
+}
+
+local function set_spy(state, arguments, level)
+  state.payload = arguments[1]
+  if arguments[2] ~= nil then
+    state.failure_message = arguments[2]
+  end
+end
+
+local function returned_with(state, arguments, level)
+  local level = (level or 1) + 1
+  local payload = rawget(state, "payload")
+  if payload and payload.returned_with then
+    local assertion_holds, matching_or_last_returnvallist = state.payload:returned_with(arguments)
+    local expected_returnvallist = util.shallowcopy(arguments)
+    util.cleararglist(arguments)
+    util.tinsert(arguments, 1, matching_or_last_returnvallist)
+    util.tinsert(arguments, 2, expected_returnvallist)
+    return assertion_holds
+  else
+    error("'returned_with' must be chained after 'spy(aspy)'", level)
+  end
+end
+
+local function called_with(state, arguments, level)
+  local level = (level or 1) + 1
+  local payload = rawget(state, "payload")
+  if payload and payload.called_with then
+    local assertion_holds, matching_or_last_arglist = state.payload:called_with(arguments)
+    local expected_arglist = util.shallowcopy(arguments)
+    util.cleararglist(arguments)
+    util.tinsert(arguments, 1, matching_or_last_arglist)
+    util.tinsert(arguments, 2, expected_arglist)
+    return assertion_holds
+  else
+    error("'called_with' must be chained after 'spy(aspy)'", level)
+  end
+end
+
+local function called(state, arguments, level, compare)
+  local level = (level or 1) + 1
+  local num_times = arguments[1]
+  if not num_times and not state.mod then
+    state.mod = true
+    num_times = 0
+  end
+  local payload = rawget(state, "payload")
+  if payload and type(payload) == "table" and payload.called then
+    local result, count = state.payload:called(num_times, compare)
+    arguments[1] = tostring(num_times or ">0")
+    util.tinsert(arguments, 2, tostring(count))
+    arguments.nofmt = arguments.nofmt or {}
+    arguments.nofmt[1] = true
+    arguments.nofmt[2] = true
+    return result
+  elseif payload and type(payload) == "function" then
+    error("When calling 'spy(aspy)', 'aspy' must not be the original function, but the spy function replacing the original", level)
+  else
+    error("'called' must be chained after 'spy(aspy)'", level)
+  end
+end
+
+local function called_at_least(state, arguments, level)
+  local level = (level or 1) + 1
+  return called(state, arguments, level, function(count, expected) return count >= expected end)
+end
+
+local function called_at_most(state, arguments, level)
+  local level = (level or 1) + 1
+  return called(state, arguments, level, function(count, expected) return count <= expected end)
+end
+
+local function called_more_than(state, arguments, level)
+  local level = (level or 1) + 1
+  return called(state, arguments, level, function(count, expected) return count > expected end)
+end
+
+local function called_less_than(state, arguments, level)
+  local level = (level or 1) + 1
+  return called(state, arguments, level, function(count, expected) return count < expected end)
+end
+
+assert:register("modifier", "spy", set_spy)
+assert:register("assertion", "returned_with", returned_with, "assertion.returned_with.positive", "assertion.returned_with.negative")
+assert:register("assertion", "called_with", called_with, "assertion.called_with.positive", "assertion.called_with.negative")
+assert:register("assertion", "called", called, "assertion.called.positive", "assertion.called.negative")
+assert:register("assertion", "called_at_least", called_at_least, "assertion.called_at_least.positive", "assertion.called_less_than.positive")
+assert:register("assertion", "called_at_most", called_at_most, "assertion.called_at_most.positive", "assertion.called_more_than.positive")
+assert:register("assertion", "called_more_than", called_more_than, "assertion.called_more_than.positive", "assertion.called_at_most.positive")
+assert:register("assertion", "called_less_than", called_less_than, "assertion.called_less_than.positive", "assertion.called_at_least.positive")
+
+return setmetatable(spy, {
+  __call = function(self, ...)
+    return spy.new(...)
+  end
+})

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/state.lua

@@ -0,0 +1,127 @@
+-- maintains a state of the assert engine in a linked-list fashion
+-- records; formatters, parameters, spies and stubs
+
+local state_mt = {
+  __call = function(self)
+    self:revert()
+  end
+}
+
+local spies_mt = { __mode = "kv" }
+
+local nilvalue = {} -- unique ID to refer to nil values for parameters
+
+-- will hold the current state
+local current
+
+-- exported module table
+local state = {}
+
+------------------------------------------------------
+-- Reverts to a (specific) snapshot.
+-- @param self (optional) the snapshot to revert to. If not provided, it will revert to the last snapshot.
+state.revert = function(self)
+  if not self then
+    -- no snapshot given, so move 1 up
+    self = current
+    if not self.previous then
+      -- top of list, no previous one, nothing to do
+      return
+    end
+  end
+  if getmetatable(self) ~= state_mt then error("Value provided is not a valid snapshot", 2) end
+
+  if self.next then
+    self.next:revert()
+  end
+  -- revert formatters in 'last'
+  self.formatters = {}
+  -- revert parameters in 'last'
+  self.parameters = {}
+  -- revert spies/stubs in 'last'
+  for s,_ in pairs(self.spies) do
+    self.spies[s] = nil
+    s:revert()
+  end
+  setmetatable(self, nil) -- invalidate as a snapshot
+  current = self.previous
+  current.next = nil
+end
+
+------------------------------------------------------
+-- Creates a new snapshot.
+-- @return snapshot table
+state.snapshot = function()
+  local new = setmetatable ({
+    formatters = {},
+    parameters = {},
+    spies = setmetatable({}, spies_mt),
+    previous = current,
+    revert = state.revert,
+  }, state_mt)
+  if current then current.next = new end
+  current = new
+  return current
+end
+
+
+--  FORMATTERS
+state.add_formatter = function(callback)
+  table.insert(current.formatters, 1, callback)
+end
+
+state.remove_formatter = function(callback, s)
+  s = s or current
+  for i, v in ipairs(s.formatters) do
+    if v == callback then
+      table.remove(s.formatters, i)
+      break
+    end
+  end
+  -- wasn't found, so traverse up 1 state
+  if s.previous then
+    state.remove_formatter(callback, s.previous)
+  end
+end
+
+state.format_argument = function(val, s, fmtargs)
+  s = s or current
+  for _, fmt in ipairs(s.formatters) do
+    local valfmt = fmt(val, fmtargs)
+    if valfmt ~= nil then return valfmt end
+  end
+  -- nothing found, check snapshot 1 up in list
+  if s.previous then
+    return state.format_argument(val, s.previous, fmtargs)
+  end
+  return nil -- end of list, couldn't format
+end
+
+
+--  PARAMETERS
+state.set_parameter = function(name, value)
+  if value == nil then value = nilvalue end
+  current.parameters[name] = value
+end
+
+state.get_parameter = function(name, s)
+  s = s or current
+  local val = s.parameters[name]
+  if val == nil and s.previous then
+    -- not found, so check 1 up in list
+    return state.get_parameter(name, s.previous)
+  end
+  if val ~= nilvalue then
+    return val
+  end
+  return nil
+end
+
+--  SPIES / STUBS
+state.add_spy = function(spy)
+  current.spies[spy] = true
+end
+
+state.snapshot()  -- create initial state
+
+return state

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/stub.lua

@@ -0,0 +1,107 @@
+-- module will return a stub module table
+local assert = require 'luassert.assert'
+local spy = require 'luassert.spy'
+local util = require 'luassert.util'
+local unpack = util.unpack
+local pack = util.pack
+
+local stub = {}
+
+function stub.new(object, key, ...)
+  if object == nil and key == nil then
+    -- called without arguments, create a 'blank' stub
+    object = {}
+    key = ""
+  end
+  local return_values = pack(...)
+  assert(type(object) == "table" and key ~= nil, "stub.new(): Can only create stub on a table key, call with 2 params; table, key", util.errorlevel())
+  assert(object[key] == nil or util.callable(object[key]), "stub.new(): The element for which to create a stub must either be callable, or be nil", util.errorlevel())
+  local old_elem = object[key]    -- keep existing element (might be nil!)
+
+  local fn = (return_values.n == 1 and util.callable(return_values[1]) and return_values[1])
+  local defaultfunc = fn or function()
+    return unpack(return_values)
+  end
+  local oncalls = {}
+  local callbacks = {}
+  local stubfunc = function(...)
+    local args = util.make_arglist(...)
+    local match = util.matchoncalls(oncalls, args)
+    if match then
+      return callbacks[match](...)
+    end
+    return defaultfunc(...)
+  end
+
+  object[key] = stubfunc          -- set the stubfunction
+  local s = spy.on(object, key)   -- create a spy on top of the stub function
+  local spy_revert = s.revert     -- keep created revert function
+
+  s.revert = function(self)       -- wrap revert function to restore original element
+    if not self.reverted then
+      spy_revert(self)
+      object[key] = old_elem
+      self.reverted = true
+    end
+    return old_elem
+  end
+
+  s.returns = function(...)
+    local return_args = pack(...)
+    defaultfunc = function()
+      return unpack(return_args)
+    end
+    return s
+  end
+
+  s.invokes = function(func)
+    defaultfunc = function(...)
+      return func(...)
+    end
+    return s
+  end
+
+  s.by_default = {
+    returns = s.returns,
+    invokes = s.invokes,
+  }
+
+  s.on_call_with = function(...)
+    local match_args = util.make_arglist(...)
+    match_args = util.copyargs(match_args)
+    return {
+      returns = function(...)
+        local return_args = pack(...)
+        table.insert(oncalls, match_args)
+        callbacks[match_args] = function()
+          return unpack(return_args)
+        end
+        return s
+      end,
+      invokes = function(func)
+        table.insert(oncalls, match_args)
+        callbacks[match_args] = function(...)
+          return func(...)
+        end
+        return s
+      end
+    }
+  end
+
+  return s
+end
+
+local function set_stub(state, arguments)
+  state.payload = arguments[1]
+  state.failure_message = arguments[2]
+end
+
+assert:register("modifier", "stub", set_stub)
+
+return setmetatable(stub, {
+  __call = function(self, ...)
+    -- stub originally was a function only. Now that it is a module table
+    -- the __call method is required for backward compatibility
+    return stub.new(...)
+  end
+})

.config/nvim/pack/tree/start/plenary.nvim/lua/luassert/util.lua

@@ -0,0 +1,362 @@
+local util = {}
+local arglist_mt = {}
+
+-- have pack/unpack both respect the 'n' field
+local _unpack = table.unpack or unpack
+local unpack = function(t, i, j) return _unpack(t, i or 1, j or t.n or #t) end
+local pack = function(...) return { n = select("#", ...), ... } end
+util.pack = pack
+util.unpack = unpack
+
+
+function util.deepcompare(t1,t2,ignore_mt,cycles,thresh1,thresh2)
+  local ty1 = type(t1)
+  local ty2 = type(t2)
+  -- non-table types can be directly compared
+  if ty1 ~= 'table' or ty2 ~= 'table' then return t1 == t2 end
+  local mt1 = debug.getmetatable(t1)
+  local mt2 = debug.getmetatable(t2)
+  -- would equality be determined by metatable __eq?
+  if mt1 and mt1 == mt2 and mt1.__eq then
+    -- then use that unless asked not to
+    if not ignore_mt then return t1 == t2 end
+  else -- we can skip the deep comparison below if t1 and t2 share identity
+    if rawequal(t1, t2) then return true end
+  end
+
+  -- handle recursive tables
+  cycles = cycles or {{},{}}
+  thresh1, thresh2 = (thresh1 or 1), (thresh2 or 1)
+  cycles[1][t1] = (cycles[1][t1] or 0)
+  cycles[2][t2] = (cycles[2][t2] or 0)
+  if cycles[1][t1] == 1 or cycles[2][t2] == 1 then
+    thresh1 = cycles[1][t1] + 1
+    thresh2 = cycles[2][t2] + 1
+  end
+  if cycles[1][t1] > thresh1 and cycles[2][t2] > thresh2 then
+    return true
+  end
+
+  cycles[1][t1] = cycles[1][t1] + 1
+  cycles[2][t2] = cycles[2][t2] + 1
+
+  for k1,v1 in next, t1 do
+    local v2 = t2[k1]
+    if v2 == nil then
+      return false, {k1}
+    end
+
+    local same, crumbs = util.deepcompare(v1,v2,nil,cycles,thresh1,thresh2)
+    if not same then
+      crumbs = crumbs or {}
+      table.insert(crumbs, k1)
+      return false, crumbs
+    end
+  end
+  for k2,_ in next, t2 do
+    -- only check whether each element has a t1 counterpart, actual comparison
+    -- has been done in first loop above
+    if t1[k2] == nil then return false, {k2} end
+  end
+
+  cycles[1][t1] = cycles[1][t1] - 1
+  cycles[2][t2] = cycles[2][t2] - 1
+
+  return true
+end
+
+function util.shallowcopy(t)
+  if type(t) ~= "table" then return t end
+  local copy = {}
+  setmetatable(copy, getmetatable(t))
+  for k,v in next, t do
+    copy[k] = v
+  end
+  return copy
+end
+
+function util.deepcopy(t, deepmt, cache)
+  local spy = require 'luassert.spy'
+  if type(t) ~= "table" then return t end
+  local copy = {}
+
+  -- handle recursive tables
+  local cache = cache or {}
+  if cache[t] then return cache[t] end
+  cache[t] = copy
+
+  for k,v in next, t do
+    copy[k] = (spy.is_spy(v) and v or util.deepcopy(v, deepmt, cache))
+  end
+  if deepmt then
+    debug.setmetatable(copy, util.deepcopy(debug.getmetatable(t), false, cache))
+  else
+    debug.setmetatable(copy, debug.getmetatable(t))
+  end
+  return copy
+end
+
+-----------------------------------------------
+-- Copies arguments as a list of arguments
+-- @param args the arguments of which to copy
+-- @return the copy of the arguments
+function util.copyargs(args)
+  local copy = {}
+  setmetatable(copy, getmetatable(args))
+  local match = require 'luassert.match'
+  local spy = require 'luassert.spy'
+  for k,v in pairs(args) do
+    copy[k] = ((match.is_matcher(v) or spy.is_spy(v)) and v or util.deepcopy(v))
+  end
+  return { vals = copy, refs = util.shallowcopy(args) }
+end
+
+-----------------------------------------------
+-- Clear an arguments or return values list from a table
+-- @param arglist the table to clear of arguments or return values and their count
+-- @return No return values
+function util.cleararglist(arglist)
+  for idx = arglist.n, 1, -1 do
+    util.tremove(arglist, idx)
+  end
+  arglist.n = nil
+end
+
+-----------------------------------------------
+-- Test specs against an arglist in deepcopy and refs flavours.
+-- @param args deepcopy arglist
+-- @param argsrefs refs arglist
+-- @param specs arguments/return values to match against args/argsrefs
+-- @return true if specs match args/argsrefs, false otherwise
+local function matcharg(args, argrefs, specs)
+  local match = require 'luassert.match'
+  for idx, argval in pairs(args) do
+    local spec = specs[idx]
+    if match.is_matcher(spec) then
+      if match.is_ref_matcher(spec) then
+        argval = argrefs[idx]
+      end
+      if not spec(argval) then
+        return false
+      end
+    elseif (spec == nil or not util.deepcompare(argval, spec)) then
+      return false
+    end
+  end
+
+  for idx, spec in pairs(specs) do
+    -- only check whether each element has an args counterpart,
+    -- actual comparison has been done in first loop above
+    local argval = args[idx]
+    if argval == nil then
+      -- no args counterpart, so try to compare using matcher
+      if match.is_matcher(spec) then
+        if not spec(argval) then
+          return false
+        end
+      else
+        return false
+      end
+    end
+  end
+  return true
+end
+
+-----------------------------------------------
+-- Find matching arguments/return values in a saved list of
+-- arguments/returned values.
+-- @param invocations_list list of arguments/returned values to search (list of lists)
+-- @param specs arguments/return values to match against argslist
+-- @return the last matching arguments/returned values if a match is found, otherwise nil
+function util.matchargs(invocations_list, specs)
+  -- Search the arguments/returned values last to first to give the
+  -- most helpful answer possible. In the cases where you can place
+  -- your assertions between calls to check this gives you the best
+  -- information if no calls match. In the cases where you can't do
+  -- that there is no good way to predict what would work best.
+  assert(not util.is_arglist(invocations_list), "expected a list of arglist-object, got an arglist")
+  for ii = #invocations_list, 1, -1 do
+    local val = invocations_list[ii]
+    if matcharg(val.vals, val.refs, specs) then
+      return val
+    end
+  end
+  return nil
+end
+
+-----------------------------------------------
+-- Find matching oncall for an actual call.
+-- @param oncalls list of oncalls to search
+-- @param args actual call argslist to match against
+-- @return the first matching oncall if a match is found, otherwise nil
+function util.matchoncalls(oncalls, args)
+  for _, callspecs in ipairs(oncalls) do
+    -- This lookup is done immediately on *args* passing into the stub
+    -- so pass *args* as both *args* and *argsref* without copying
+    -- either.
+    if matcharg(args, args, callspecs.vals) then
+      return callspecs
+    end
+  end
+  return nil
+end
+
+-----------------------------------------------
+-- table.insert() replacement that respects nil values.
+-- The function will use table field 'n' as indicator of the
+-- table length, if not set, it will be added.
+-- @param t table into which to insert
+-- @param pos (optional) position in table where to insert. NOTE: not optional if you want to insert a nil-value!
+-- @param val value to insert
+-- @return No return values
+function util.tinsert(...)
+  -- check optional POS value
+  local args = {...}
+  local c = select('#',...)
+  local t = args[1]
+  local pos = args[2]
+  local val = args[3]
+  if c < 3 then
+    val = pos
+    pos = nil
+  end
+  -- set length indicator n if not present (+1)
+  t.n = (t.n or #t) + 1
+  if not pos then
+    pos = t.n
+  elseif pos > t.n then
+    -- out of our range
+    t[pos] = val
+    t.n = pos
+  end
+  -- shift everything up 1 pos
+  for i = t.n, pos + 1, -1 do
+    t[i]=t[i-1]
+  end
+  -- add element to be inserted
+  t[pos] = val
+end
+-----------------------------------------------
+-- table.remove() replacement that respects nil values.
+-- The function will use table field 'n' as indicator of the
+-- table length, if not set, it will be added.
+-- @param t table from which to remove
+-- @param pos (optional) position in table to remove
+-- @return No return values
+function util.tremove(t, pos)
+  -- set length indicator n if not present (+1)
+  t.n = t.n or #t
+  if not pos then
+    pos = t.n
+  elseif pos > t.n then
+    local removed = t[pos]
+    -- out of our range
+    t[pos] = nil
+    return removed
+  end
+  local removed = t[pos]
+  -- shift everything up 1 pos
+  for i = pos, t.n do
+    t[i]=t[i+1]
+  end
+  -- set size, clean last
+  t[t.n] = nil
+  t.n = t.n - 1
+  return removed
+end
+
+-----------------------------------------------
+-- Checks an element to be callable.
+-- The type must either be a function or have a metatable
+-- containing an '__call' function.
+-- @param object element to inspect on being callable or not
+-- @return boolean, true if the object is callable
+function util.callable(object)
+  return type(object) == "function" or type((debug.getmetatable(object) or {}).__call) == "function"
+end
+
+-----------------------------------------------
+-- Checks an element has tostring.
+-- The type must either be a string or have a metatable
+-- containing an '__tostring' function.
+-- @param object element to inspect on having tostring or not
+-- @return boolean, true if the object has tostring
+function util.hastostring(object)
+  return type(object) == "string" or type((debug.getmetatable(object) or {}).__tostring) == "function"
+end
+
+-----------------------------------------------
+-- Find the first level, not defined in the same file as the caller's
+-- code file to properly report an error.
+-- @param level the level to use as the caller's source file
+-- @return number, the level of which to report an error
+function util.errorlevel(level)
+  local level = (level or 1) + 1 -- add one to get level of the caller
+  local info = debug.getinfo(level)
+  local source = (info or {}).source
+  local file = source
+  while file and (file == source or source == "=(tail call)") do
+    level = level + 1
+    info = debug.getinfo(level)
+    source = (info or {}).source
+  end
+  if level > 1 then level = level - 1 end -- deduct call to errorlevel() itself
+  return level
+end
+
+-----------------------------------------------
+-- Extract modifier and namespace keys from list of tokens.
+-- @param nspace the namespace from which to match tokens
+-- @param tokens list of tokens to search for keys
+-- @return table, list of keys that were extracted
+function util.extract_keys(nspace, tokens)
+  local namespace = require 'luassert.namespaces'
+
+  -- find valid keys by coalescing tokens as needed, starting from the end
+  local keys = {}
+  local key = nil
+  local i = #tokens
+  while i > 0 do
+    local token = tokens[i]
+    key = key and (token .. '_' .. key) or token
+
+    -- find longest matching key in the given namespace
+    local longkey = i > 1 and (tokens[i-1] .. '_' .. key) or nil
+    while i > 1 and longkey and namespace[nspace][longkey] do
+      key = longkey
+      i = i - 1
+      token = tokens[i]
+      longkey = (token .. '_' .. key)
+    end
+
+    if namespace.modifier[key] or namespace[nspace][key] then
+      table.insert(keys, 1, key)
+      key = nil
+    end
+    i = i - 1
+  end
+
+  -- if there's anything left we didn't recognize it
+  if key then
+    error("luassert: unknown modifier/" .. nspace .. ": '" .. key .."'", util.errorlevel(2))
+  end
+
+  return keys
+end
+
+-----------------------------------------------
+-- store argument list for return values of a function in a table.
+-- The table will get a metatable to identify it as an arglist
+function util.make_arglist(...)
+  local arglist = { ... }
+  arglist.n = select('#', ...) -- add values count for trailing nils
+  return setmetatable(arglist, arglist_mt)
+end
+
+-----------------------------------------------
+-- check a table to be an arglist type.
+function util.is_arglist(object)
+  return getmetatable(object) == arglist_mt
+end
+
+return util