load packages only if installed

plugin/20_startup.lua

@@ -390,23 +390,25 @@ end)
 
 -- zk
 now_if_args(function()
-  require("zk").setup({
-    picker = "minipick",
-    lsp = {
-      -- `config` is passed to `vim.lsp.start_client(config)`
-      config = {
-        cmd = { "zk", "lsp" },
-        name = "zk",
-        -- on_attach = ...
-        -- etc, see `:h vim.lsp.start_client()`
-      },
+  if nix.get_cat("markdown", false) then
+    require("zk").setup({
+      picker = "minipick",
+      lsp = {
+        -- `config` is passed to `vim.lsp.start_client(config)`
+        config = {
+          cmd = { "zk", "lsp" },
+          name = "zk",
+          -- on_attach = ...
+          -- etc, see `:h vim.lsp.start_client()`
+        },
 
-      -- automatically attach buffers in a zk notebook that match the given filetypes
-      auto_attach = {
-        enabled = true,
-        filetypes = { "markdown" },
-      },
+        -- automatically attach buffers in a zk notebook that match the given filetypes
+        auto_attach = {
+          enabled = true,
+          filetypes = { "markdown" },
+        },
 
-    },
-  })
+      },
+    })
+  end
 end)