yasnippet-snippets/snippets/crystal-mode/mod

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# -*- mode: snippet -*-
# name: module ... end
# group : definitions
# key: mod
# --
module ${1:`(let ((fn (capitalize (file-name-nondirectory
(file-name-sans-extension
(or (buffer-file-name)
(buffer-name (current-buffer))))))))
(while (string-match "_" fn)
(setq fn (replace-match "" nil nil fn)))
fn)`}
$0
end