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json-to-fstree.fnl (842B)

      1 (local json (require :json))
      2 (local http (require :fetch))
      3 (local svc (require :anoia.svc))
      4 (local { : utime } (require :lualinux))
      5 
      6 (fn download [url dest]
      7   (let [state (.. dest "/state")
      8         previously (ll.lstat state 12)]
      9     (match (http.fetch url "i" previously)
     10       (nil 10 _) ; not modified
     11       (print (.. url " not modified, already up to date"))
     12 
     13       (nil code str)
     14       (assert nil (.. "error " code ": " str))
     15 
     16       (body { : last-modified })
     17       (let [service (svc.open dest)
     18             lock (.. dest "/.lock")]
     19         (with-open [fout (io.open lock :w)] (fout:write ""))
     20         (service:output "." (json.decode body))
     21         (with-open [fout (io.open state :w)] (fout:write "ok"))
     22         (utime state last-modified)
     23         (os.remove lock))
     24 
     25       )))
     26 
     27 (fn run [] (download (. arg 1) (. arg 2)))
     28 
     29 
     30 { : run }