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)

plugin/21_datascience.lua

@@ -71,22 +71,24 @@ end)
 now(function()
   vim.treesitter.language.register("markdown", { "quarto", "rmd" })
 
-  vim.api.nvim_create_autocmd("FileType", {
-    pattern = { "quarto" },
-    callback = function()
-      require("otter").activate()
-    end,
-  })
+  if nix.get_cat({"r", "markdown"}, false) then
+    vim.api.nvim_create_autocmd("FileType", {
+      pattern = { "quarto" },
+      callback = function()
+        require("otter").activate()
+      end,
+    })
 
-  require("otter").setup({
-    lsp = {
-      diagnostic_update_events = { "BufWritePost", "InsertLeave" },
-    },
-    buffers = {
-      set_filetype = true,
-      write_to_disk = true,
-    },
-  })
+    require("otter").setup({
+      lsp = {
+        diagnostic_update_events = { "BufWritePost", "InsertLeave" },
+      },
+      buffers = {
+        set_filetype = true,
+        write_to_disk = true,
+      },
+    })
+  end
 end)
 
 later(function()