How to include or use external modules in macros?

[kkharji]

Hey @Olical, finally I'm back at rewriting my config with aniseed. Currently I'm trying to leverage macros. However, I'm getting errors due to external module, I tried to define c in let expression, didn't work, also tried defining a local variable (local c (require aniseed.core)) at the top of the file, but that too didn't fix my issue.

Here is my macro.fnl, I'm basically writing a macro that would bind key definition or a list of definitions.

Thanks

{
 :bindkey
 (fn [m]
   (let [options (or (. m 4) {})
         opts (c.merge {:noremap true :silent true} options)
         buffer (. m :buffer)
         prefix {}
         formatrhs (fn [m]
                     (let [opts (or (. m 4) {})
                           dep (. opts :dep)
                           extra (if (not dep) ""
                                   (c.table? dep) (.. "<cmd>packadd " (table.concat dep " ") "<cr>")
                                   (c.string? dep) (.. "<cmd>packadd " dep "<cr>"))
                           rhs (if (. opts :lua) (.. extra "<cmd>" "lua " (. m 3) "<cr>")
                                 (. opts :cmd) (.. extra "<cmd>" (. m 3) "<cr>")
                                 :else (.. extra (. m 3) ))] rhs))]
     `(do 
        (each [mode _ (string.gmatch (. m 1) "(%w)")]
          (table.insert prefix mode))
        (each [_ key (pairs [ "cmd" "lua" "dep" "buffer"])]
          (c.assoc opts key nil))
        (each [_ mode (pairs prefix)]
          (if buffer
            (vim.schedule #(vim.api.nvim_buf_set_keymap buffer mode (. m 2) (formatrhs m) opts))
            :else
            (vim.schedule #(vim.api.nvim_set_keymap mode (. m 2) (formatrhs m) opts))))   
        )))

 :bindgroup
 (fn [group]
   `(c.run! bindkey group))
}

[Olical]

Hey, so this is because you're referring to a value in your macro file at runtime with (c.run! bindkey group), c is not defined at runtime, only at compile time.

If you would like c at runtime you'll need something like this:

 :bindgroup
 (fn [group]
   `(let [c (require :aniseed.core]
      (c.run! bindkey group)))

Does that make sense?

[kkharji]

@Olical thanks for your quick response, let me test and report back

[kkharji]

@Olical I got this error now

Compile error in /home/tami/.config/nvim/fnl/env/macros.fnl:39
  macro tried to bind c without gensym
   `(let [c (require :aniseed.core)]
* Try changing to c# when introducing identifiers inside macros.

Current code

{
 :bindkey
 (fn [m]
   `(let [c (require :aniseed.core)
          options (or (. m 4) {})
          opts (c.merge {:noremap true :silent true} options)
          buffer (. m :buffer)
          prefix {}
          formatrhs (fn [m]
                      (let [opts (or (. m 4) {})
                            dep (. opts :dep)
                            extra (if (not dep) ""
                                    (c.table? dep) (.. "<cmd>packadd " (table.concat dep " ") "<cr>")
                                    (c.string? dep) (.. "<cmd>packadd " dep "<cr>"))
                            rhs (if (. opts :lua) (.. extra "<cmd>" "lua " (. m 3) "<cr>")
                                  (. opts :cmd) (.. extra "<cmd>" (. m 3) "<cr>")
                                  :else (.. extra (. m 3) ))] rhs))]
      (do
        (each [mode _ (string.gmatch (. m 1) "(%w)")]
          (table.insert prefix mode))
        (each [_ key (pairs [ "cmd" "lua" "dep" "buffer"])]
          (c.assoc opts key nil))
        (each [_ mode (pairs prefix)]
          (if buffer
            (vim.schedule #(vim.api.nvim_buf_set_keymap buffer mode (. m 2) (formatrhs m) opts))
            :else
            (vim.schedule #(vim.api.nvim_set_keymap mode (. m 2) (formatrhs m) opts))))
        )))

 :bindgroup
 (fn [group]
   `(let [c (require :aniseed.core)]
      (c.run! bindkey group)))
}

[Olical]

Oh, since you're introducing a local in that let in a macro fennel forces you to use generated symbols, or gensym, with a # suffix as the error explains.

So just replace occurrences of c with c# and it should be okay. This should all be documented on the fennel website, although maybe not in deep detail, reading my Aniseed macros file might help you out too.

[kkharji]

Thanks a lot @Olical , I'm going to revisit this after I'm done with porting my config.