Add +format-with-lsp variable

To control whether or not to use LSP code formatter when it is
available.

modules/editor/format/autoload/format.el

@@ -206,7 +206,8 @@ See `+format/buffer' for the interactive version of this function, and
   "Reformat the current buffer using LSP or `format-all-buffer'."
   (interactive)
   (call-interactively
-   (if (and (bound-and-true-p lsp-mode)
+   (if (and +format-with-lsp
+            (bound-and-true-p lsp-mode)
             (lsp-feature? "textDocument/formatting"))
        #'lsp-format-buffer
      #'format-all-buffer)))
@@ -219,7 +220,8 @@ WARNING: this may not work everywhere. It will throw errors if the region
 contains a syntax error in isolation. It is mostly useful for formatting
 snippets or single lines."
   (interactive "rP")
-  (if (and (bound-and-true-p lsp-mode)
+  (if (and +format-with-lsp
+           (bound-and-true-p lsp-mode)
            (lsp-feature? "textDocument/rangeFormatting"))
       #'lsp-format-region
     (save-restriction

modules/editor/format/config.el

@@ -23,6 +23,12 @@ Indentation is always preserved when formatting regions.")
 (defvar-local +format-with nil
   "Set this to explicitly use a certain formatter for the current buffer.")
 
+(defvar +format-with-lsp t
+  "If non-nil, format with LSP formatter if it's available.
+
+This can be set buffer-locally with `setq-hook!' to disable LSP formatting in
+select buffers.")
+
 
 ;;
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