How not to write code with scsh [Scheme Shell]
For the hell of it I decided to write that "content_index" calculator in scsh.
With a lot of help from Riastradh on #scsh I've now got the following:
(let ((read-ls-output (field-reader (infix-splitter (rx (+ " ")) -8)))) (format #t "~A kilobytes" (/ (fold + 0 (map string->number (run/strings (| (find "." -name "content_index" -print0) (xargs "-0" ls -l) (begin (read-line) (awk (read-ls-output) (record fields) () (#t (format #t "~A~%" (list-ref fields 4))))))))) 1024))(newline))Which works but is incredibly ugly.
It performs the find as you would expect. Then I use the scsh "awk"-like functionality to filter out the 4th field [size]. run/strings builds a list of strings which I convert to numbers using map with string->number.
To sum the items I call fold with + and 0 [is the identity of addition]. I divide it by 1024 and use the result in a format statement [works like printf for scheme]. The let statement binds me an expression holding the result of field-reader which produces a function. The -8 means that I expect at least 8 records and the rest are seen as the final record. This is for
ls -lwhen you have files/directories with spaces.
There are better ways...
And here it is:
(begin (format #t "~A kilobytes" (/ (fold + 0 (map file-info:size (map file-info (run/strings (find "." -name "content_index"))))) 1024)) (newline))
Again... thanks fo Riastradh for teaching me about the REPL.