feat(nix): indentation queries

tests/indent/nix_spec.lua

@@ -0,0 +1,40 @@
+local Runner = require("tests.indent.common").Runner
+
+local runner = Runner:new(it, "tests/indent/nix", {
+  tabstop = 2,
+  shiftwidth = 2,
+  softtabstop = 2,
+  expandtab = true,
+})
+
+describe("indent Nix:", function()
+  describe("whole file:", function()
+    runner:whole_file(".", {
+      expected_failures = {},
+    })
+  end)
+
+  describe("new line:", function()
+    for _, info in ipairs {
+      { 14, 2 },
+      { 16, 2 },
+      { 48, 4 },
+      { 112, 6 },
+    } do
+      runner:new_line("general.nix", { on_line = info[1], text = "x = 1;", indent = info[2] })
+    end
+
+    for _, info in ipairs {
+      { 115, 6 },
+      { 113, 10 },
+      { 6, 4 },
+      { 12, 2 },
+      { 16, 6 },
+      { 35, 6 },
+      { 23, 2 },
+      { 21, 6 },
+    } do
+      runner:new_line("conds.nix", { on_line = info[1], text = "x = 1;", indent = info[2] })
+    end
+  end)
+end)