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let
nixpkgs-lib = import <nixpkgs/lib>;
lib = with lib; nixpkgs-lib // builtins // {
git = import ./git.nix { inherit lib; };
shell = import ./shell.nix { inherit lib; };
types = nixpkgs-lib.types // import ./types.nix { inherit lib; };
eq = x: y: x == y;
ne = x: y: x != y;
mod = x: y: x - y * (x / y);
genid = import ./genid.nix { inherit lib; };
genid_signed = x: ((lib.genid x) + 16777216) / 2;
lpad = n: c: s:
if lib.stringLength s < n
then lib.lpad n c (c + s)
else s;
subdirsOf = path:
lib.mapAttrs (name: _: path + "/${name}")
(filterAttrs (_: eq "directory") (readDir path));
genAttrs' = names: f: listToAttrs (map f names);
getAttrs = names: set:
listToAttrs (map (name: nameValuePair name set.${name})
(filter (flip hasAttr set) names));
setAttr = name: value: set: set // { ${name} = value; };
toC = x: let
type = typeOf x;
reject = throw "cannot convert ${type}";
in {
list = "{ ${concatStringsSep ", " (map toC x)} }";
null = "NULL";
set = if isDerivation x then toJSON x else reject;
string = toJSON x; # close enough
}.${type} or reject;
indent = replaceChars ["\n"] ["\n "];
# https://tools.ietf.org/html/rfc5952
normalize-ip6-addr =
let
max-run-0 =
let
both = v: { off = v; pos = v; };
gt = a: b: a.pos - a.off > b.pos - b.off;
chkmax = ctx: {
cur = both (ctx.cur.pos + 1);
max = if gt ctx.cur ctx.max then ctx.cur else ctx.max;
};
incpos = ctx: recursiveUpdate ctx {
cur.pos = ctx.cur.pos + 1;
};
f = ctx: blk: (if blk == "0" then incpos else chkmax) ctx;
z = { cur = both 0; max = both 0; };
in
blks: (chkmax (foldl' f z blks)).max;
group-zeros = a:
let
blks = splitString ":" a;
max = max-run-0 blks;
lhs = take max.off blks;
rhs = drop max.pos blks;
in
if max.pos == 0
then a
else "${concatStringsSep ":" lhs}::${concatStringsSep ":" rhs}";
drop-leading-zeros =
let
f = block:
let
res = match "0*(.+)" block;
in
if res == null
then block # empty block
else elemAt res 0;
in
a: concatStringsSep ":" (map f (splitString ":" a));
in
a: toLower (group-zeros (drop-leading-zeros a));
};
in
lib
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