summaryrefslogtreecommitdiffstats
path: root/lib/default.nix
blob: 75086f864d9aa2ad1469346827f2c5e23f6a0dcd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
let
  nixpkgs-lib = import <nixpkgs/lib>;
  lib = with lib; nixpkgs-lib // builtins // {

    evalSource = import ./eval-source.nix;

    git = import ./git.nix { inherit lib; };
    krebs = import ./krebs lib;
    krops = import ../submodules/krops/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 = lib.genid_uint32; # TODO remove
    genid_uint31 = x: ((lib.genid_uint32 x) + 16777216) / 2;
    genid_uint32 = import ./genid.nix { inherit lib; };

    lpad = n: c: s:
      if lib.stringLength s < n
        then lib.lpad n c (c + s)
        else s;

    genAttrs' = names: f: listToAttrs (map f names);

    getAttrs = names: set:
      listToAttrs (map (name: nameValuePair name set.${name})
                       (filter (flip hasAttr set) names));

    test = re: x: isString x && testString re x;

    testString = re: x: match re x != null;

    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  "];

    mapNixDir = f: x: {
      list = foldl' mergeAttrs {} (map (mapNixDir1 f) x);
      path = mapNixDir1 f x;
    }.${typeOf x};

    mapNixDir1 = f: dirPath:
      listToAttrs
        (map
          (relPath: let
            name = removeSuffix ".nix" relPath;
            path = dirPath + "/${relPath}";
          in
            nameValuePair name (f path))
          (filter
            (name: name != "default.nix" && !hasPrefix "." name)
            (attrNames (readDir dirPath))));

    # 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 let
                sep =
                  if 8 - (length lhs + length rhs) == 1
                    then ":0:"
                    else "::";
              in
                "${concatStringsSep ":" lhs}${sep}${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
            (if test ".*::.*" a
              then a
              else group-zeros (drop-leading-zeros a));

    hashToLength = n: s: substring 0 n (hashString "sha256" s);

    dropLast = n: xs: reverseList (drop n (reverseList xs));
    takeLast = n: xs: reverseList (take n (reverseList xs));

    # Split string into list of chunks where each chunk is at most n chars long.
    # The leftmost chunk might shorter.
    # Example: stringToGroupsOf "123456" -> ["12" "3456"]
    stringToGroupsOf = n: s: let
      acc =
        foldl'
          (acc: c: if stringLength acc.chunk < n then {
            chunk = acc.chunk + c;
            chunks = acc.chunks;
          } else {
            chunk = c;
            chunks = acc.chunks ++ [acc.chunk];
          })
          {
            chunk = "";
            chunks = [];
          }
          (stringToCharacters s);
    in
      filter (x: x != []) ([acc.chunk] ++ acc.chunks);

    warnOldVersion = oldName: newName:
      if compareVersions oldName newName != -1 then
        trace "Upstream `${oldName}' gets overridden by `${newName}'." newName
      else
        newName;
  };
in

lib