71 lines
2.3 KiB
Nix
71 lines
2.3 KiB
Nix
{lib, ...}: { config.lyn.lib = rec {
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/**
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Split a string, and return all elements after a marker.
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# Example
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```
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splitAfterMarker "/" "modules" /home/user/flake/modules/abc/def
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== ["abc" "def"]
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```
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*/
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splitAfterMarker = splitter: marker: input: builtins.foldl' (acc: new:
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if acc == false then # marker not found yet
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if new == marker then [] /* marker found */ else false
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else acc ++ [new] # marker already found, add to output list
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) false (lib.splitString splitter input);
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/**
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Make a Nix module, with its attrpath being the local path
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relative to a marker directory. Accepts a prefix, and removes `.nix` file endings.
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# Example
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```
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mkLocalModuleMarker "modules" ["myModules" "abc"] ./current-file.nix "enable something" {}
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{ myModules.abc.current.file.path.current-file.enable = true; }
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```
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*/
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mkLocalModuleMarker = marker: prefix: currentPath: optDesc: moduleConfig: let
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normalizedPath = removeSuffix ".nix" (builtins.toString currentPath);
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attrPath = prefix ++ (splitAfterMarker "/" marker normalizedPath);
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mod = {config, ...}: {
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options = lib.setAttrsByPath attrPath (lib.mkEnableOption optDesc);
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config = lib.mkIf (lib.getAttrByPath attrPath config) moduleConfig;
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};
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in mod;
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/**
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Find a folder or a parent folder containing a file.
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# Example
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```
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findFolderWithFile "flake.nix" ./.
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== /home/user/flake/
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```
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*/
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findFolderWithFile = file: arg:
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if builtins.pathExists (arg + "/" + file) then arg
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else if arg == /. then throw "could not find folder containing ${file}"
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else findRoot file (arg + "/..");
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/**
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Shorthand for mkLocalModuleMarker, setting marker to your flake and prefix to l.
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*/
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mkLocalModule = path: mkLocalModuleMarker (findFolderWithFile "flake.nix" path) ["lyn"] path;
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};}
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# foldl' op nul [x0 x1 x2 ...] = op (op (op nul x0) x1) x2) .... For example, foldl' (x: y: x + y) 0 [1 2 3]
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# input = /home/alina/flake/desktop/common
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# options.desktop.common
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# input' = /nix/store/aaa-flake/desktop/common
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# foldl' (split "/" input)
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# marker = flake
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# foldl' ([home alina flake modules audio.nix ])
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# acc = false false [] [modules] [modules audio.nix]
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# | ^ marker found
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# | marker not found yet
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# $ echo "abc\ndef" > readme
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# readPathsFromFile "readme" == [./abc ./def]
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