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string-option

A cursed way to pass arbitrary string options to flakes. Inspired by Command Line Flake Arguments.

The options are extracted in ascending lexicographic order using builtins.attrNames. You are responsible for naming them so they behave.

Example flake.nix

{
  inputs = {
    # For the library used to decode this terrible mess
    string-option.url = "github:numinit/string-option";

    # Pad to the maximum allowable length of your string.
    option_00.url = "github:numinit/string-option";
    option_01.url = "github:numinit/string-option";
    option_02.url = "github:numinit/string-option";
    option_03.url = "github:numinit/string-option";
    option_04.url = "github:numinit/string-option";
    option_05.url = "github:numinit/string-option";
    option_06.url = "github:numinit/string-option";
    option_07.url = "github:numinit/string-option";
    option_08.url = "github:numinit/string-option";
    option_09.url = "github:numinit/string-option";
    option_10.url = "github:numinit/string-option";
    option_11.url = "github:numinit/string-option";
    option_12.url = "github:numinit/string-option";
    option_13.url = "github:numinit/string-option";
    option_14.url = "github:numinit/string-option";
    option_15.url = "github:numinit/string-option";
  };

  outputs = { self, string-option, ... }@args: {
    # First argument is the prefix, second is all your arguments.
    value = string-option.extract "option_" args;
  };
}

Running it

This repository includes at least one branch for every character in the printable ASCII character set exporting a single-character string as the flake output "value". The master branch returns an empty string.

Characters matching /[A-Za-z0-9_]/ are considered safe to include in a flake URL and have their own branches. Decimal and hex versions (lowercase; prefixed with 0x) are included too.

So, to pass "Hello world!" to a flake that depends on this one, you'd do something like the following:

nix eval \
    --override-input option_00 github:numinit/string-option/H \
    --override-input option_01 github:numinit/string-option/e \
    --override-input option_02 github:numinit/string-option/l \
    --override-input option_03 github:numinit/string-option/l \
    --override-input option_04 github:numinit/string-option/o \
    --override-input option_05 github:numinit/string-option/32 \
    --override-input option_06 github:numinit/string-option/w \
    --override-input option_07 github:numinit/string-option/o \
    --override-input option_08 github:numinit/string-option/r \
    --override-input option_09 github:numinit/string-option/l \
    --override-input option_10 github:numinit/string-option/d \
    --override-input option_11 github:numinit/string-option/33 \
    --raw \
    .#value

This has the added benefit of being roughly 58x less efficient to write out than just "Hello world!"

Another example with home-manager in numinit/dotfiles that passes the current username into the flake for the purpose of setting up home-manager:

  dotfiles = pkgs.writeShellScriptBin "dotfiles.sh" ''
    config="$1"
    if [ -z "$config" ]; then
        config=".#workstation"
    fi

    set -euo pipefail
    username="$(whoami)"
    username="''${username:0:16}"

    extra_args=()
    for ((i=0;i<''${#username};i++)); do
        char="''${username:i:1}"
        extra_args+=(
            --override-input
            "username_$(printf '%02d' "$i")"
            "github:numinit/string-option/$(printf '%d' "'$char")"
        )
    done

    cd "${self}" && exec ${
      home-manager.packages.${system}.default
    }/bin/home-manager switch \
        --flake "''${config}" \
        ''${extra_args[@]+"''${extra_args[@]}"}
  '';

List of all the branches

In case you actually wanted to use this for some reason.

Character Plain Decimal Hex
"\t" (N/A; collides with the digit '9') github:numinit/string-option/0x09
"\n" github:numinit/string-option/10 github:numinit/string-option/0x0a
"\r" github:numinit/string-option/13 github:numinit/string-option/0x0d
" " github:numinit/string-option/32 github:numinit/string-option/0x20
"!" github:numinit/string-option/33 github:numinit/string-option/0x21
"\"" github:numinit/string-option/34 github:numinit/string-option/0x22
"#" github:numinit/string-option/35 github:numinit/string-option/0x23
"$" github:numinit/string-option/36 github:numinit/string-option/0x24
"%" github:numinit/string-option/37 github:numinit/string-option/0x25
"&" github:numinit/string-option/38 github:numinit/string-option/0x26
"'" github:numinit/string-option/39 github:numinit/string-option/0x27
"(" github:numinit/string-option/40 github:numinit/string-option/0x28
")" github:numinit/string-option/41 github:numinit/string-option/0x29
"*" github:numinit/string-option/42 github:numinit/string-option/0x2a
"+" github:numinit/string-option/43 github:numinit/string-option/0x2b
"," github:numinit/string-option/44 github:numinit/string-option/0x2c
"-" github:numinit/string-option/45 github:numinit/string-option/0x2d
"." github:numinit/string-option/46 github:numinit/string-option/0x2e
"/" github:numinit/string-option/47 github:numinit/string-option/0x2f
"0" github:numinit/string-option/0 github:numinit/string-option/48 github:numinit/string-option/0x30
"1" github:numinit/string-option/1 github:numinit/string-option/49 github:numinit/string-option/0x31
"2" github:numinit/string-option/2 github:numinit/string-option/50 github:numinit/string-option/0x32
"3" github:numinit/string-option/3 github:numinit/string-option/51 github:numinit/string-option/0x33
"4" github:numinit/string-option/4 github:numinit/string-option/52 github:numinit/string-option/0x34
"5" github:numinit/string-option/5 github:numinit/string-option/53 github:numinit/string-option/0x35
"6" github:numinit/string-option/6 github:numinit/string-option/54 github:numinit/string-option/0x36
"7" github:numinit/string-option/7 github:numinit/string-option/55 github:numinit/string-option/0x37
"8" github:numinit/string-option/8 github:numinit/string-option/56 github:numinit/string-option/0x38
"9" github:numinit/string-option/9 github:numinit/string-option/57 github:numinit/string-option/0x39
":" github:numinit/string-option/58 github:numinit/string-option/0x3a
";" github:numinit/string-option/59 github:numinit/string-option/0x3b
"<" github:numinit/string-option/60 github:numinit/string-option/0x3c
"=" github:numinit/string-option/61 github:numinit/string-option/0x3d
">" github:numinit/string-option/62 github:numinit/string-option/0x3e
"?" github:numinit/string-option/63 github:numinit/string-option/0x3f
"@" github:numinit/string-option/64 github:numinit/string-option/0x40
"A" github:numinit/string-option/A github:numinit/string-option/65 github:numinit/string-option/0x41
"B" github:numinit/string-option/B github:numinit/string-option/66 github:numinit/string-option/0x42
"C" github:numinit/string-option/C github:numinit/string-option/67 github:numinit/string-option/0x43
"D" github:numinit/string-option/D github:numinit/string-option/68 github:numinit/string-option/0x44
"E" github:numinit/string-option/E github:numinit/string-option/69 github:numinit/string-option/0x45
"F" github:numinit/string-option/F github:numinit/string-option/70 github:numinit/string-option/0x46
"G" github:numinit/string-option/G github:numinit/string-option/71 github:numinit/string-option/0x47
"H" github:numinit/string-option/H github:numinit/string-option/72 github:numinit/string-option/0x48
"I" github:numinit/string-option/I github:numinit/string-option/73 github:numinit/string-option/0x49
"J" github:numinit/string-option/J github:numinit/string-option/74 github:numinit/string-option/0x4a
"K" github:numinit/string-option/K github:numinit/string-option/75 github:numinit/string-option/0x4b
"L" github:numinit/string-option/L github:numinit/string-option/76 github:numinit/string-option/0x4c
"M" github:numinit/string-option/M github:numinit/string-option/77 github:numinit/string-option/0x4d
"N" github:numinit/string-option/N github:numinit/string-option/78 github:numinit/string-option/0x4e
"O" github:numinit/string-option/O github:numinit/string-option/79 github:numinit/string-option/0x4f
"P" github:numinit/string-option/P github:numinit/string-option/80 github:numinit/string-option/0x50
"Q" github:numinit/string-option/Q github:numinit/string-option/81 github:numinit/string-option/0x51
"R" github:numinit/string-option/R github:numinit/string-option/82 github:numinit/string-option/0x52
"S" github:numinit/string-option/S github:numinit/string-option/83 github:numinit/string-option/0x53
"T" github:numinit/string-option/T github:numinit/string-option/84 github:numinit/string-option/0x54
"U" github:numinit/string-option/U github:numinit/string-option/85 github:numinit/string-option/0x55
"V" github:numinit/string-option/V github:numinit/string-option/86 github:numinit/string-option/0x56
"W" github:numinit/string-option/W github:numinit/string-option/87 github:numinit/string-option/0x57
"X" github:numinit/string-option/X github:numinit/string-option/88 github:numinit/string-option/0x58
"Y" github:numinit/string-option/Y github:numinit/string-option/89 github:numinit/string-option/0x59
"Z" github:numinit/string-option/Z github:numinit/string-option/90 github:numinit/string-option/0x5a
"[" github:numinit/string-option/91 github:numinit/string-option/0x5b
"\\" github:numinit/string-option/92 github:numinit/string-option/0x5c
"]" github:numinit/string-option/93 github:numinit/string-option/0x5d
"^" github:numinit/string-option/94 github:numinit/string-option/0x5e
"_" github:numinit/string-option/_ github:numinit/string-option/95 github:numinit/string-option/0x5f
""" github:numinit/string-option/96 github:numinit/string-option/0x60
"a" github:numinit/string-option/a github:numinit/string-option/97 github:numinit/string-option/0x61
"b" github:numinit/string-option/b github:numinit/string-option/98 github:numinit/string-option/0x62
"c" github:numinit/string-option/c github:numinit/string-option/99 github:numinit/string-option/0x63
"d" github:numinit/string-option/d github:numinit/string-option/100 github:numinit/string-option/0x64
"e" github:numinit/string-option/e github:numinit/string-option/101 github:numinit/string-option/0x65
"f" github:numinit/string-option/f github:numinit/string-option/102 github:numinit/string-option/0x66
"g" github:numinit/string-option/g github:numinit/string-option/103 github:numinit/string-option/0x67
"h" github:numinit/string-option/h github:numinit/string-option/104 github:numinit/string-option/0x68
"i" github:numinit/string-option/i github:numinit/string-option/105 github:numinit/string-option/0x69
"j" github:numinit/string-option/j github:numinit/string-option/106 github:numinit/string-option/0x6a
"k" github:numinit/string-option/k github:numinit/string-option/107 github:numinit/string-option/0x6b
"l" github:numinit/string-option/l github:numinit/string-option/108 github:numinit/string-option/0x6c
"m" github:numinit/string-option/m github:numinit/string-option/109 github:numinit/string-option/0x6d
"n" github:numinit/string-option/n github:numinit/string-option/110 github:numinit/string-option/0x6e
"o" github:numinit/string-option/o github:numinit/string-option/111 github:numinit/string-option/0x6f
"p" github:numinit/string-option/p github:numinit/string-option/112 github:numinit/string-option/0x70
"q" github:numinit/string-option/q github:numinit/string-option/113 github:numinit/string-option/0x71
"r" github:numinit/string-option/r github:numinit/string-option/114 github:numinit/string-option/0x72
"s" github:numinit/string-option/s github:numinit/string-option/115 github:numinit/string-option/0x73
"t" github:numinit/string-option/t github:numinit/string-option/116 github:numinit/string-option/0x74
"u" github:numinit/string-option/u github:numinit/string-option/117 github:numinit/string-option/0x75
"v" github:numinit/string-option/v github:numinit/string-option/118 github:numinit/string-option/0x76
"w" github:numinit/string-option/w github:numinit/string-option/119 github:numinit/string-option/0x77
"x" github:numinit/string-option/x github:numinit/string-option/120 github:numinit/string-option/0x78
"y" github:numinit/string-option/y github:numinit/string-option/121 github:numinit/string-option/0x79
"z" github:numinit/string-option/z github:numinit/string-option/122 github:numinit/string-option/0x7a
"{" github:numinit/string-option/123 github:numinit/string-option/0x7b
"|" github:numinit/string-option/124 github:numinit/string-option/0x7c
"}" github:numinit/string-option/125 github:numinit/string-option/0x7d
"~" github:numinit/string-option/126 github:numinit/string-option/0x7e

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A cursed way to pass arbitrary string options to flakes.

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