jdhao-nvim-config/lua/utils.lua

local fn = vim.fn

local M = {}

function M.executable(name)
  if fn.executable(name) > 0 then
    return true
  end

  return false
end

--- check whether a feature exists in Nvim
--- @param feat string the feature name, like `nvim-0.7` or `unix`.
--- @return boolean
M.has = function(feat)
  if fn.has(feat) == 1 then
    return true
  end

  return false
end

--- Create a dir if it does not exist
function M.may_create_dir(dir)
  local res = fn.isdirectory(dir)

  if res == 0 then
    fn.mkdir(dir, "p")
  end
end

--- Generate random integers in the range [Low, High], inclusive,
--- adapted from https://stackoverflow.com/a/12739441/6064933
--- @param low integer the lower value for this range
--- @param high integer the upper value for this range
--- @return integer
function M.rand_int(low, high)
  -- Use lua to generate random int, see also: https://stackoverflow.com/a/20157671/6064933
  math.randomseed(os.time())

  return math.random(low, high)
end

--- Select a random element from a sequence/list.
--- @param seq any[] the sequence to choose an element
function M.rand_element(seq)
  local idx = M.rand_int(1, #seq)

  return seq[idx]
end

return M