status-react/nix/tools/mkFilter.nix

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{ lib }:
# This Nix expression allows filtering a local directory by specifying dirRootsToInclude, dirsToExclude and filesToInclude.
# It also filters out symlinks to result folders created by nix-build, as well as backup/swap/generated files
let
inherit (lib)
any compare compareLists elem elemAt hasPrefix length min splitString take;
isPathAllowed = allowedPath: path:
let
count = min (length allowedPathElements) (length pathElements);
pathElements = splitString "/" path;
allowedPathElements = splitString "/" allowedPath;
pathElementsSubset = take count pathElements;
allowedPathElementsSubset = take count allowedPathElements;
in (compareLists compare allowedPathElementsSubset pathElementsSubset) == 0;
mkFilter = { dirRootsToInclude, # Relative paths of directories to include
dirsToExclude ? [ ], # Base names of directories to exclude
filesToInclude ? [ ], # Relative path of files to include
filesToExclude ? [ ], # Relative path of files to exclude
root }:
path: type:
let
baseName = baseNameOf (toString path);
subpath = elemAt (splitString "${toString root}/" path) 1;
spdir = elemAt (splitString "/" subpath) 0;
in lib.cleanSourceFilter path type && (
(type != "directory" && (elem spdir filesToInclude) && !(elem spdir filesToExclude)) ||
# check if any part of the directory path is described in dirRootsToInclude
((any (dirRootToInclude: isPathAllowed dirRootToInclude subpath) dirRootsToInclude) && ! (
# Filter out version control software files/directories
(type == "directory" && (elem baseName dirsToExclude))
)));
in mkFilter