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58 lines
2.6 KiB
Nix
58 lines
2.6 KiB
Nix
lib: rec
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{
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attrsToList = attrs: builtins.map (name: { inherit name; value = attrs.${name}; }) (builtins.attrNames attrs);
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mkConditional = condition: trueResult: falseResult: let inherit (lib) mkMerge mkIf; in
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mkMerge [ ( mkIf condition trueResult ) ( mkIf (!condition) falseResult ) ];
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# Behaviors of these two NixOS modules would be different:
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# { pkgs, ... }@inputs: { environment.systemPackages = [ pkgs.hello ]; }
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# inputs: { environment.systemPackages = [ pkgs.hello ]; }
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# The second one would failed to evaluate because nixpkgs would not pass pkgs to it.
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# So that we wrote a wrapper to make it always works like the first one.
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mkModules = moduleList:
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(builtins.map
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(
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let handle = module: let type = builtins.typeOf module; in
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if type == "path" || type == "string" then (handle (import module))
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else if type == "lambda" then ({ pkgs, utils, ... }@inputs: (module inputs))
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else module;
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in handle
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)
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moduleList);
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# from: https://github.com/NixOS/nix/issues/3759
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stripeTabs = text:
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let
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# Whether all lines start with a tab (or is empty)
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shouldStripTab = lines: builtins.all (line: (line == "") || (lib.strings.hasPrefix " " line)) lines;
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# Strip a leading tab from all lines
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stripTab = lines: builtins.map (line: lib.strings.removePrefix " " line) lines;
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# Strip tabs recursively until there are none
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stripTabs = lines: if (shouldStripTab lines) then (stripTabs (stripTab lines)) else lines;
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in
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# Split into lines. Strip leading tabs. Concat back to string.
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builtins.concatStringsSep "\n" (stripTabs (lib.strings.splitString "\n" text));
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# find an element in a list, return the index
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findIndex = e: list:
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let findIndex_ = i: list: if (builtins.elemAt list i) == e then i else findIndex_ (i + 1) list;
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in findIndex_ 0 list;
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# return a list of path, including:
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# - all .nix file in the directory except for default.nix
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# - all directories containing a default.nix
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findModules = path:
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mkModules (builtins.filter (path: path != null) (builtins.map
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(subPath:
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if subPath.value == "regular" && subPath.name != "default.nix"
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then if lib.strings.hasSuffix ".nix" subPath.name
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then "${path}/${subPath.name}"
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else null
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else if subPath.value == "directory"
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then if (builtins.readDir "${path}/${subPath.name}")."default.nix" or null == "regular"
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then "${path}/${subPath.name}"
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else null
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else null)
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(attrsToList (builtins.readDir path))));
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}
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