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https://github.com/CHN-beta/nixos.git
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65 lines
2.9 KiB
Nix
65 lines
2.9 KiB
Nix
lib:
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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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# Input a list of modules, allowed types are:
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# * attribute set
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# * file containing attribute set
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# * file containing lambda, which takes inputs as argument
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# * lambda, which takes inputs as argument
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# * list, first member is a lambda,
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mkModules = moduleList: { pkgs, ... }@inputs:
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{
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imports = builtins.map
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(
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let
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handle = { module, customArgs }:
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if ( builtins.typeOf module ) == "list"
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then handle { module = builtins.elemAt module 0; customArgs = builtins.elemAt module 1; }
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else if ( builtins.typeOf module ) == "path"
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then handle { module = import module; inherit customArgs; }
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else if ( builtins.typeOf module ) == "lambda" && customArgs != null # deprecated
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then handle { module = module customArgs; customArgs = null; }
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else if ( builtins.typeOf module ) == "lambda" then module inputs # deprecated
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else module;
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caller = module: handle { inherit module; customArgs = null; };
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in caller
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) moduleList;
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};
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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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# moduleList: { pkgs, ... }@inputs:
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# {
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# imports = builtins.map
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# (
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# handle = module:
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# if ( builtins.typeOf module ) == "path" then handle import module
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# else if ( builtins.typeOf module ) == "lambda" then module inputs
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# else module;
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# ) moduleList;
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# }
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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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}
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