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