languages/elixir: readd; format module options

modules/extra/deprecations.nix

@@ -3,11 +3,6 @@
 in {
   imports = [
     # 2024-06-06
-    (mkRemovedOptionModule ["vim" "languages" "elixir"] ''
-      Elixir language support has been removed as of 2024-06-06 as it was long unmaintained. If
-      you dependend on this language support, please consider contributing to its maintenance.
-    '')
-
     (mkRemovedOptionModule ["vim" "tidal"] ''
       Tidalcycles language support has been removed as of 2024-06-06 as it was long unmaintained. If
       you depended on this functionality, please open an issue.

modules/plugins/languages/default.nix

@@ -6,6 +6,7 @@ in {
     ./dart.nix
     ./clang.nix
     ./css.nix
+    ./elixir.nix
     ./go.nix
     ./html.nix
     ./java.nix

modules/plugins/languages/elixir.nix

@@ -0,0 +1,138 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (builtins) attrNames;
+  inherit (lib.options) mkEnableOption mkOption;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.lists) isList;
+  inherit (lib.types) enum either listOf package str;
+  inherit (lib.nvim.types) mkGrammarOption;
+  inherit (lib.nvim.lua) expToLua;
+  inherit (lib.nvim.dag) entryAnywhere;
+
+  cfg = config.vim.languages.elixir;
+
+  defaultServer = "elixirls";
+  servers = {
+    elixirls = {
+      package = pkgs.elixir-ls;
+      lspConfig = ''
+        -- elixirls setup
+        lspconfig.elixirls.setup {
+          capabilities = capabilities,
+          on_attach = default_on_attach,
+          cmd = ${
+          if isList cfg.lsp.package
+          then expToLua cfg.lsp.package
+          else ''{"${cfg.lsp.package}/bin/elixir-ls"}''
+        }
+        }
+      '';
+    };
+  };
+
+  defaultFormat = "mix";
+  formats = {
+    mix = {
+      package = pkgs.elixir;
+      nullConfig = ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.formatting.mix.with({
+            command = "${cfg.format.package}/bin/mix",
+          })
+        )
+      '';
+    };
+  };
+in {
+  options.vim.languages.elixir = {
+    enable = mkEnableOption "Elixir language support";
+
+    treesitter = {
+      enable = mkEnableOption "Elixir treesitter" // {default = config.vim.languages.enableTreesitter;};
+      package = mkGrammarOption pkgs "elixir";
+    };
+
+    lsp = {
+      enable = mkEnableOption "Elixir LSP support" // {default = config.vim.languages.enableLSP;};
+
+      server = mkOption {
+        description = "Elixir LSP server to use";
+        type = enum (attrNames servers);
+        default = defaultServer;
+      };
+
+      package = mkOption {
+        description = "Elixir LSP server package, or the command to run as a list of strings";
+        example = ''[lib.getExe pkgs.jdt-language-server " - data " " ~/.cache/jdtls/workspace "]'';
+        type = either package (listOf str);
+        default = servers.${cfg.lsp.server}.package;
+      };
+    };
+
+    format = {
+      enable = mkEnableOption "Elixir formatting" // {default = config.vim.languages.enableFormat;};
+
+      type = mkOption {
+        description = "Elixir formatter to use";
+        type = enum (attrNames formats);
+        default = defaultFormat;
+      };
+
+      package = mkOption {
+        description = "Elixir formatter package";
+        type = package;
+        default = formats.${cfg.format.type}.package;
+      };
+    };
+
+    elixir-tools = {
+      enable = mkEnableOption "Elixir tools";
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.package];
+    })
+
+    (mkIf cfg.lsp.enable {
+      vim.lsp.lspconfig.enable = true;
+      vim.lsp.lspconfig.sources.elixir-lsp = servers.${cfg.lsp.server}.lspConfig;
+    })
+
+    (mkIf cfg.format.enable {
+      vim.lsp.null-ls.enable = true;
+      vim.lsp.null-ls.sources.elixir-format = formats.${cfg.format.type}.nullConfig;
+    })
+
+    (mkIf cfg.elixir-tools.enable {
+      vim.startPlugins = ["elixir-tools"];
+      vim.luaConfigRC.elixir-tools = entryAnywhere ''
+        local elixir-tools = require("elixir")
+        local elixirls = require("elixir-tools.elixirls")
+
+        -- disable imperative insstallations of various
+        -- elixir related tools installed by elixir-tools
+        elixir-tools.setup {
+          nextls = {
+            enable = false -- defaults to false
+          },
+
+          credo = {
+            enable = false -- defaults to true
+          },
+
+          elixirls = {
+            enable = false, -- defaults to true
+          }
+        }
+      '';
+    })
+  ]);
+}

modules/plugins/languages/elixir/config.nix

@@ -1,67 +0,0 @@
-{
-  config,
-  lib,
-  pkgs,
-  ...
-}: let
-  inherit (lib.modules) mkIf;
-  inherit (lib.meta) getExe;
-  inherit (lib.nvim.dag) entryAnywhere;
-
-  cfg = config.vim.languages.elixir;
-in {
-  config = mkIf (cfg.enable) {
-    vim.startPlugins = [
-      "elixir-tools"
-    ];
-
-    vim.luaConfigRC.elixir-tools = entryAnywhere ''
-        local elixir = require("elixir")
-        local elixirls = require("elixir.elixirls")
-
-        elixir.setup {
-          elixirls = {
-          -- alternatively, point to an existing elixir-ls installation (optional)
-          -- not currently supported by elixirls, but can be a table if you wish to pass other args `{"path/to/elixirls", "--foo"}`
-          cmd = "${getExe pkgs.elixir-ls}",
-
-          -- default settings, use the `settings` function to override settings
-          settings = elixirls.settings {
-            dialyzerEnabled = true,
-            fetchDeps = false,
-            enableTestLenses = false,
-            suggestSpecs = false,
-          },
-
-          on_attach = function(client, bufnr)
-            local map_opts = { buffer = true, noremap = true}
-
-            -- run the codelens under the cursor
-            vim.keymap.set("n", "<space>r",  vim.lsp.codelens.run, map_opts)
-            -- remove the pipe operator
-            vim.keymap.set("n", "<space>fp", ":ElixirFromPipe<cr>", map_opts)
-            -- add the pipe operator
-            vim.keymap.set("n", "<space>tp", ":ElixirToPipe<cr>", map_opts)
-            vim.keymap.set("v", "<space>em", ":ElixirExpandMacro<cr>", map_opts)
-
-            -- bindings for standard LSP functions.
-            vim.keymap.set("n", "<space>df", "<cmd>lua vim.lsp.buf.format()<cr>", map_opts)
-            vim.keymap.set("n", "<space>gd", "<cmd>lua vim.diagnostic.open_float()<cr>", map_opts)
-            vim.keymap.set("n", "<space>dt", "<cmd>lua vim.lsp.buf.definition()<cr>", map_opts)
-            vim.keymap.set("n", "<space>K", "<cmd>lua vim.lsp.buf.hover()<cr>", map_opts)
-            vim.keymap.set("n", "<space>gD","<cmd>lua vim.lsp.buf.implementation()<cr>", map_opts)
-            vim.keymap.set("n", "<space>1gD","<cmd>lua vim.lsp.buf.type_definition()<cr>", map_opts)
-
-            -- keybinds for fzf-lsp.nvim: https://github.com/gfanto/fzf-lsp.nvim
-            -- you could also use telescope.nvim: https://github.com/nvim-telescope/telescope.nvim
-            -- there are also core vim.lsp functions that put the same data in the loclist
-            vim.keymap.set("n", "<space>gr", ":References<cr>", map_opts)
-            vim.keymap.set("n", "<space>g0", ":DocumentSymbols<cr>", map_opts)
-            vim.keymap.set("n", "<space>gW", ":WorkspaceSymbols<cr>", map_opts)
-            vim.keymap.set("n", "<leader>d", ":Diagnostics<cr>", map_opts)
-          end
-        }
-      }
-    '';
-  };
-}

modules/plugins/languages/elixir/default.nix

@@ -1,6 +0,0 @@
-{
-  imports = [
-    ./config.nix
-    ./elixir-tools.nix
-  ];
-}

modules/plugins/languages/elixir/elixir-tools.nix

@@ -1,7 +0,0 @@
-{lib, ...}: let
-  inherit (lib.options) mkEnableOption;
-in {
-  options.vim.languages.elixir = {
-    enable = mkEnableOption "Elixir language support";
-  };
-}