yasnippet-snippets/snippets/crystal-mode/cls

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# -*- mode: snippet -*-
# name: class ... end
# key: cls
# group : definitions
# --
class ${1:`(let ((fn (capitalize (file-name-nondirectory
(file-name-sans-extension
(or (buffer-file-name)
(buffer-name (current-buffer))))))))
(replace-regexp-in-string "_" "" fn t t))`}
$0
end