flakelike

default.nix

@@ -0,0 +1,51 @@
+# if evaluating outside of the store, copy the current directory to the store and import it
+# filtering out .gitignore files and .git directories
+# if evaluating inside the store, import the outputs.nix file
+
+let
+  contains = str: substr: let
+    str_length = builtins.stringLength str;
+    substr_length = builtins.stringLength substr;
+    listOfPossibleSubstrings = builtins.genList (i: builtins.substring i substr_length str) (str_length - substr_length + 1);
+  in if substr_length > str_length then false else builtins.any (x: x == substr) listOfPossibleSubstrings;
+
+  endsWith = str: substr: let
+    str_length = builtins.stringLength str;
+    substr_length = builtins.stringLength substr;
+  in if substr_length > str_length then false else builtins.substring (str_length - substr_length) str_length str == substr;
+
+  gitignore = builtins.filter (v:
+      # ignore comments and empty lines
+      if !(builtins.isString v) then false
+      else if !builtins.isNull(builtins.match "^#.*" v) then false
+      else if !builtins.isNull(builtins.match "^$" v) then false
+      else true
+    ) (builtins.split "\n" (builtins.readFile ./.gitignore));
+  
+  # checks if a given path matches a gitignore pattern
+  # string -> bool
+  matchesGitIgnore = path: builtins.any (pattern:
+    let
+      patternLength = builtins.stringLength pattern;
+      unsupportedPatternMessage = "matchesGitIgnore: Unsupported pattern: ${pattern}";
+    in
+      if pattern == "*" then true
+      else if pattern == ".*" then true
+      else if pattern == "*.*" then true
+      else if builtins.substring 0 2 pattern == "*." then endsWith path (builtins.substring 0 2 pattern)
+      else if contains pattern "*" then abort unsupportedPatternMessage
+      else if patternLength > 2 && builtins.substring 0 2 pattern == "./" then abort unsupportedPatternMessage
+      else if patternLength > 1 && builtins.substring 0 1 pattern == "/" then abort unsupportedPatternMessage
+      else contains path pattern
+  ) gitignore;
+
+  currentFilePath = (builtins.unsafeGetAttrPos "any" { any = "any"; }).file;
+  storePathLength = builtins.stringLength (builtins.toString builtins.storeDir);
+  evaluatingInStore = (builtins.substring 0 storePathLength currentFilePath) == builtins.storeDir;
+
+  selfInStore = builtins.filterSource (path: type:
+      type != "unknown" && builtins.baseNameOf path != ".git" && !matchesGitIgnore path
+    ) ./.;
+in
+if !(evaluatingInStore) then import selfInStore
+else import ./outputs.nix