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Article contents:== sexpc [[toc:]] {{sexpc}} is a tiny li'l Unix filter that reads one sexp from stdin and outputs the same expression in C syntax, using foof's [[http://synthcode.com/scheme/fmt|fmt-c combinators]]. (The percent signs didn't make sense to me so I made them optional.) It's like three lines, since foof did all the heavy lifting (and that tree library I wrote a few years back), it's just a toy. The cool part is that you can use it in Emacs. Put this in your Emacs once you have the sexpc binary in your path: (defun sexpc () (interactive) (shell-command-on-region (progn (beginning-of-defun) (point)) (save-excursion (end-of-defun) (point)) "sexpc" nil t)) Here's an example. Someone sends you a file and you wanna hack in it, but, it's C instead of a normal sexp language. Let's say you wanna add a fib function. You type: (fun #f fib (n) (if (<= n 1) 1 (+ (fib (- n 1)) (fib (- n 2))))) Easy enough with Paredit and friends. Then, with your cursor anywhere in the sexp, you call {{sexpc}} (via {{M-x}} or via a binding), and it's replaced by: int fib (int n) { if (n <= 1) { return 1; } else { return fib(n - 1) + fib(n - 2); } } === Roadmap Of course, down the line we'd wanna figure out a way to do macros, quasiquoting etc, and support other C-like languages like JavaScript or Golang. That might require a setup beyond just reading one sexp. But sometimes cool stuff can grow from what starts as just a toy. === Source code git clone https://idiomdrottning.org/sexpc Description of your changes:

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