feat: bash language server

modules/languages/bash/bash.nix

@@ -0,0 +1,121 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with builtins; let
+  inherit (lib) mkOption mkEnableOption types;
+
+  cfg = config.vim.languages.bash;
+
+  defaultServer = "bash-ls";
+  servers = {
+    bash-ls = {
+      package = pkgs.nodePackages.bash-language-server;
+      lspConfig = ''
+        lspconfig.bashls.setup{
+          capabilities = capabilities;
+          on_attach = default_on_attach;
+          cmd = ${
+          if isList cfg.lsp.package
+          then nvim.lua.expToLua cfg.lsp.package
+          else ''{"${cfg.lsp.package}/bin/bash-language-server",  "start"}''
+        };
+        }
+      '';
+    };
+  };
+
+  defaultFormat = "shfmt";
+  formats = {
+    shfmt = {
+      package = pkgs.shfmt;
+      nullConfig = ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.formatting.shfmt.with({
+            command = "${pkgs.shfmt}/bin/shfmt",
+          })
+        )
+      '';
+    };
+  };
+
+  defaultDiagnostics = ["shellcheck"];
+  diagnostics = {
+    shellcheck = {
+      package = pkgs.shellcheck;
+      nullConfig = pkg: ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.diagnostics.shellcheck.with({
+            command = "${pkg}/bin/shellcheck",
+          })
+        )
+      '';
+    };
+  };
+in {
+  options.vim.languages.bash = {
+    enable = mkEnableOption "Bash language support";
+
+    treesitter = {
+      enable = mkOption {
+        description = "Bash treesitter";
+        type = types.bool;
+        default = config.vim.languages.enableTreesitter;
+      };
+      package = lib.nvim.types.mkGrammarOption pkgs "bash";
+    };
+
+    lsp = {
+      enable = mkEnableOption "Enable Bash LSP support" // {default = config.vim.languages.enableLSP;};
+
+      server = mkOption {
+        description = "Bash LSP server to use";
+        type = with types; enum (attrNames servers);
+        default = defaultServer;
+      };
+
+      package = mkOption {
+        description = "bash-language-server package, or the command to run as a list of strings";
+        example = lib.literalExpression ''[lib.getExe pkgs.nodePackages.bash-language-server "start"]'';
+        type = with types; either package (listOf str);
+        default = pkgs.nodePackages.bash-language-server;
+      };
+    };
+
+    format = {
+      enable = mkOption {
+        description = "Enable Bash formatting";
+        type = types.bool;
+        default = config.vim.languages.enableFormat;
+      };
+      type = mkOption {
+        description = "Bash formatter to use";
+        type = with types; enum (attrNames formats);
+        default = defaultFormat;
+      };
+
+      package = mkOption {
+        description = "Bash formatter package";
+        type = types.package;
+        default = formats.${cfg.format.type}.package;
+      };
+    };
+
+    extraDiagnostics = {
+      enable = mkOption {
+        description = "Enable extra Bash diagnostics";
+        type = types.bool;
+        default = config.vim.languages.enableExtraDiagnostics;
+      };
+      types = lib.nvim.types.diagnostics {
+        langDesc = "Bash";
+        inherit diagnostics;
+        inherit defaultDiagnostics;
+      };
+    };
+  };
+}

modules/languages/bash/config.nix

@@ -0,0 +1,80 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with builtins; let
+  cfg = config.vim.languages.bash;
+  diagnostics = {
+    shellcheck = {
+      package = pkgs.shellcheck;
+      nullConfig = pkg: ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.diagnostics.shellcheck.with({
+            command = "${pkg}/bin/shellcheck",
+          })
+        )
+      '';
+    };
+  };
+
+  formats = {
+    shfmt = {
+      package = pkgs.shfmt;
+      nullConfig = ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.formatting.shfmt.with({
+            command = "${pkgs.shfmt}/bin/shfmt",
+          })
+        )
+      '';
+    };
+  };
+
+  servers = {
+    bash-ls = {
+      package = pkgs.nodePackages.bash-language-server;
+      lspConfig = ''
+        lspconfig.bashls.setup{
+          capabilities = capabilities;
+          on_attach = default_on_attach;
+          cmd = ${
+          if isList cfg.lsp.package
+          then nvim.lua.expToLua cfg.lsp.package
+          else ''{"${cfg.lsp.package}/bin/bash-language-server",  "start"}''
+        };
+        }
+      '';
+    };
+  };
+in {
+  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.bash-lsp = servers.${cfg.lsp.server}.lspConfig;
+    })
+
+    (mkIf cfg.format.enable {
+      vim.lsp.null-ls.enable = true;
+      vim.lsp.null-ls.sources.bash-format = formats.${cfg.format.type}.nullConfig;
+    })
+
+    (mkIf cfg.extraDiagnostics.enable {
+      vim.lsp.null-ls.enable = true;
+      vim.lsp.null-ls.sources = lib.nvim.languages.diagnosticsToLua {
+        lang = "bash";
+        config = cfg.extraDiagnostics.types;
+        inherit diagnostics;
+      };
+    })
+  ]);
+}

modules/languages/bash/default.nix

@@ -0,0 +1,6 @@
+_: {
+  imports = [
+    ./bash.nix
+    ./config.nix
+  ];
+}