language/markdown: added markdown-previewer.nvim

modules/languages/markdown/config.nix

@@ -4,7 +4,8 @@
   lib,
   ...
 }: let
-  inherit (lib) nvim mkIf mkMerge mkBinding isList;
+  inherit (lib) nvim mkIf mkMerge mkBinding isList concatMapStringsSep;
+  inherit (nvim.vim) mkVimBool;
 
   cfg = config.vim.languages.markdown;
   self = import ./markdown.nix {
@@ -49,6 +50,21 @@ in {
       '';
     })
 
+    (mkIf cfg.markdownPreview.enable {
+      vim.startPlugins = [pkgs.vimPlugins.markdown-preview-nvim];
+
+      vim.configRC.markdown-preview = nvim.dag.entryAnywhere ''
+        let g:mkdp_auto_start = ${mkVimBool cfg.markdownPreview.autoStart}
+        let g:mkdp_auto_close = ${mkVimBool cfg.markdownPreview.autoClose}
+        let g:mkdp_refresh_slow = ${mkVimBool cfg.markdownPreview.lazyRefresh}
+        let g:mkdp_filetypes = [${concatMapStringsSep ", " (x: "'" + x + "'") cfg.markdownPreview.filetypes}]
+        let g:mkdp_command_for_global = ${mkVimBool cfg.markdownPreview.alwaysAllowPreview}
+        let g:mkdp_open_to_the_world = ${mkVimBool cfg.markdownPreview.broadcastServer}
+        let g:mkdp_open_ip = '${cfg.markdownPreview.customIP}'
+        let g:mkdp_port = '${cfg.markdownPreview.customPort}'
+      '';
+    })
+
     (mkIf cfg.lsp.enable {
       vim.lsp.lspconfig.enable = true;
 

modules/languages/markdown/markdown.nix

@@ -40,6 +40,62 @@ in {
       };
     };
 
+    markdownPreview = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Enable markdown preview in neovim with markdown-preview.nvim";
+      };
+
+      autoStart = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Automatically open the preview window after entering a Markdown buffer";
+      };
+
+      autoClose = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Automatically close the preview window after leaving a Markdown buffer";
+      };
+
+      lazyRefresh = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Only update preview when saving or leaving insert mode";
+      };
+
+      filetypes = mkOption {
+        type = types.listOf types.str;
+        default = ["markdown"];
+        description = "Allowed filetypes";
+      };
+
+      alwaysAllowPreview = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Allow preview on all filetypes";
+      };
+
+      broadcastServer = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Allow for outside and network wide connections";
+      };
+
+      customIP = mkOption {
+        type = types.str;
+        default = "";
+        description = "IP-address to use";
+      };
+
+      customPort = mkOption {
+        type = types.str;
+        default = "";
+        description = "Port to use";
+      };
+    };
+
     treesitter = {
       enable = mkOption {
         description = "Enable Markdown treesitter";