Re: Convert the shell command used in emacs init-file into its normal version.

[Jean Louis <bugs@gnu.support>]

* Hongyi Zhao <hongyi.zhao@gmail.com> [2021-06-09 09:50]:
> I found the following command from
> <https://github.com/jethrokuan/mathpix.el/blob/02016ca4aee9ffce32e730372f45de35c00a3657/mathpix.el#L49>:
> 
> "curl -s https://api.mathpix.com/v3/latex -X POST -H \"app_id: %s\" -H
> \"app_key: %s\" -H \"Content-Type: application/json\" --data
> \"{\\\"src\\\":\\\"%s\\\",\\\"formats\\\":
> [\\\"latex_styled\\\"],\\\"format_options\\\":{\\\"latex_styled\\\":
> {\\\"transforms\\\": [\\\"rm_spaces\\\"]}}}\""
> 
> I want to obtain its normal version and test it under the system's
> shell terminal. Any hints for deleting the escape characters correctly
> from the above command in Emacs way?

You should use the function `call-process' as it will help with
quoting:

(call-process "curl" nil nil nil "-s" "https://api.mathpix.com/v3/latex"
	      "-X" "POST" "-H" (format "app_id: %s" id) 
	      "-H" (format "app_key: %s" key)
	      "-H" "Content-Type: application/json"
	      "--data" "{\"src\":\"%s\",
                         \"formats\": [\"latex_styled\"],
                         \"format_options\": {\"latex_styled\": 
                                             {\"transforms\": [\"rm_spaces\"]}}}")

The data part I would format before it arrives to function `call-process'

Please study the function definition with {C-h f call-process RET}

-- 
Jean

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