Add lua dap/osv configuration

vim/.config/nvim/ftplugin/lua.lua

@@ -1,3 +1,86 @@
+local dap = require('dap')
+local api = vim.api
+dap.adapters.nlua = function(callback, conf)
+  local adapter = {
+    type = 'server',
+    host = '127.0.0.1',
+    port = conf.port
+  }
+  if conf.start_neovim then
+    local start_opts = conf.start_neovim
+    conf.start_neovim = nil
+    local handle
+    local pid_or_err
+    local opts = {
+      args = {
+        '-e',
+        'v',
+        '-c',
+        string.format("lua require('osv').launch({ port = %s })", conf.port),
+        start_opts.fname or api.nvim_buf_get_name(0),
+      },
+      cwd = start_opts.cwd or vim.fn.getcwd(),
+      detached = true,
+    }
+    handle, pid_or_err = vim.loop.spawn('/usr/bin/alacritty', opts, function(code)
+      handle:close()
+      assert(code == 0, "Exit code must be 0, not " .. tostring(code))
+    end)
+    if not handle then
+      error(pid_or_err)
+    end
+    local timer = vim.loop.new_timer()
+    timer:start(1000, 0, function()
+      timer:stop()
+      timer:close()
+      vim.schedule(function()
+        callback(adapter)
+      end)
+    end)
+  else
+    callback(adapter)
+  end
+end
+
+
+local function free_port()
+  local tcp = vim.loop.new_tcp()
+  tcp:bind('127.0.0.1', 0)
+  local port = tcp:getsockname().port
+  tcp:shutdown()
+  tcp:close()
+  return port
+end
+
+
+dap.configurations.lua = {
+  {
+    type = 'nlua',
+    request = 'attach',
+    name = 'Attach',
+    port = function()
+      return assert(tonumber(vim.fn.input('Port: ')), 'Port is required')
+    end
+  },
+  {
+    type = "nlua",
+    request = "attach",
+    name = "New instance (current file)",
+    port = free_port,
+    start_neovim = {}
+  },
+  {
+    type = "nlua",
+    request = "attach",
+    name = "New instance (crate/crate)",
+    port = free_port,
+    start_neovim = {
+      cwd = os.getenv('HOME') .. '/dev/crate/crate',
+      fname = 'server/src/test/java/io/crate/planner/PlannerTest.java',
+    }
+  }
+}
+
 local lsp = require('me.lsp.conf')
 local config = lsp.mk_config()