fix: spec list with a single plugin spec ignored (#34)

lua/lz/n/spec.lua

@@ -151,10 +151,18 @@ local function parse(spec)
     return result
 end
 
+---XXX: This is unsafe because we assume a prior `vim.islist` check
+---
+---@param spec lz.n.Spec
+---@return boolean
+local function is_list_with_single_spec_unsafe(spec)
+    return #spec == 1 and type(spec[1]) == "table"
+end
+
 ---@param spec lz.n.Spec
 ---@return boolean
 function M.is_spec_list(spec)
-    return #spec > 1 or vim.islist(spec) and #spec > 1
+    return #spec > 1 or vim.islist(spec) and #spec > 1 or is_list_with_single_spec_unsafe(spec)
 end
 
 ---@param spec lz.n.Spec

spec/lz_n_spec.lua

@@ -81,5 +81,22 @@ describe("lz.n", function()
             vim.api.nvim_feedkeys(feed, "ix", false)
             assert.True(loaded)
         end)
+        it("list with a single plugin spec", function()
+            local spy_load = spy.on(loader, "_load")
+            lz.load({
+                {
+                    "single.nvim",
+                    cmd = "Single",
+                },
+            })
+            assert.spy(spy_load).called(0)
+            pcall(vim.cmd.Single)
+            assert.spy(spy_load).called(1)
+            assert.spy(spy_load).called_with({
+                name = "single.nvim",
+                lazy = true,
+                cmd = { "Single" },
+            })
+        end)
     end)
 end)