nixvim: re-add edit_alternate.vim

modules2/nixvim/edit-alternate/config.nix

@@ -0,0 +1,56 @@
+{
+  flake.modules.nixvim.custom.extraConfigLua = ''
+    vim.fn["edit_alternate#rule#add"]("php", function(filename)
+      if filename:find "Test.php$" then
+        filename = filename:gsub("Test.php$", ".php")
+
+        if filename:find "tests/src/" then
+          -- Drupal tests. Remove the `src/{type}` from the path.
+          return filename:gsub("tests/src/(.-)/", "src/")
+        else
+          return filename:gsub("tests/", "src/")
+        end
+      else
+        filename = filename:gsub(".php$", "Test.php")
+
+        if filename:find "modules/custom" then
+          -- Drupal test types.
+          local test_types = { "Functional", "FunctionalJavaScript", "Kernel", "Unit" }
+
+          for _, test_type in ipairs(test_types) do
+            local filename_with_test_type = filename:gsub("src/", string.format("tests/src/%s/", test_type))
+
+            -- Return the first matching test file that exists.
+            if vim.fn.filereadable(filename_with_test_type) == 1 then
+              return filename_with_test_type
+            end
+          end
+        end
+      end
+    end)
+
+    if vim.fn.filereadable "composer.json" == 1 then
+      vim.fn["edit_alternate#rule#add"]("json", function(filename)
+        if filename:find "composer.json" then
+          return (filename:gsub("%.json$", ".lock"))
+        end
+      end)
+
+      vim.fn["edit_alternate#rule#add"]("lock", function(filename)
+        if filename:find "composer.lock" then
+          return (filename:gsub("%.lock$", ".json"))
+        end
+      end)
+    end
+
+    if vim.fn.filereadable "fractal.config.js" == 1 then
+      vim.fn["edit_alternate#rule#add"]("twig", function(filename)
+        return (filename:gsub("%.twig$", ".config.yml"))
+      end)
+
+      vim.fn["edit_alternate#rule#add"]("yml", function(filename)
+        return (filename:gsub("%.config.yml$", ".twig"))
+      end)
+    end
+  '';
+}