65 lines
1.9 KiB
Fennel
65 lines
1.9 KiB
Fennel
(fn merge [table1 table2]
|
|
(collect [k v (pairs table2) &into table1]
|
|
k v))
|
|
|
|
(fn dup [table]
|
|
(collect [k v (pairs table)] k v))
|
|
|
|
(fn split [sep string]
|
|
(icollect [v (string.gmatch string (.. "([^" sep "]+)"))]
|
|
v))
|
|
|
|
(fn file-exists? [name]
|
|
(match (io.open name :r)
|
|
f (do (f:close) true)
|
|
_ false))
|
|
|
|
(fn system [s]
|
|
(match (os.execute s)
|
|
res (do (print (.. "Executed \"" s "\", exit code " (tostring res))) res)
|
|
(nil err) (error (.. "Error executing \"" s "\" (" err ")"))))
|
|
|
|
(fn hash [str]
|
|
(accumulate [h 5381
|
|
c (str:gmatch ".")]
|
|
(+ (* h 33) (string.byte c))))
|
|
|
|
|
|
(local
|
|
base64-indices
|
|
(doto [
|
|
"B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P"
|
|
"Q" "R" "S" "T" "U" "V" "W" "X" "Y" "Z" "a" "b" "c" "d" "e" "f"
|
|
"g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v"
|
|
"w" "x" "y" "z" "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "-" "_"
|
|
]
|
|
(tset 0 "A")))
|
|
|
|
;; local function base64(s)
|
|
;; local byte, rep = string.byte, string.rep
|
|
;; local pad = 2 - ((#s-1) % 3)
|
|
;; s = (s..rep('\0', pad)):gsub("...", function(cs)
|
|
;; local a, b, c = byte(cs, 1, 3)
|
|
;; return bs[a>>2] .. bs[(a&3)<<4|b>>4] .. bs[(b&15)<<2|c>>6] .. bs[c&63]
|
|
;; end)
|
|
;; return s:sub(1, #s-pad) .. rep('=', pad)
|
|
;; end
|
|
|
|
(fn base64url [s]
|
|
"URL-safe Base64-encoded form of s (no trailing padding)"
|
|
(let [pad (- 2 (% (- (# s) 1) 3))
|
|
bs base64-indices
|
|
blank (string.rep "\0" pad)
|
|
s (-> (.. s blank)
|
|
(: :gsub
|
|
"..."
|
|
(fn [cs]
|
|
(let [(a b c) (string.byte cs 1 3)]
|
|
(.. (. bs (rshift a 2))
|
|
(. bs (bor (lshift (band a 3) 4) (rshift b 4)))
|
|
(. bs (bor (lshift (band b 15) 2) (rshift c 6)))
|
|
(. bs (band c 63)))))))]
|
|
(s:sub 1 (- (# s) pad))))
|
|
|
|
|
|
{ : merge : split : file-exists? : system : hash : base64url : dup }
|