wrapper-manager-fds/lib: add function for getting XDG-related directories

lib/utils.nix

@@ -9,7 +9,23 @@ rec {
     builtins.map (v: lib.getBin v) drvs;
 
   /*
+    Given a list of derivations, return a list of the store paths with the
+    `libexec` appended.
   */
   getLibexec = drvs:
     builtins.map (v: "${v}/libexec") drvs;
+
+  /*
+    Given a list of derivations, return a list of the store paths appended with
+    `/etc/xdg` suitable as part of the XDG_CONFIG_DIRS environment variable.
+  */
+  getXdgConfigDirs = drvs:
+    builtins.map (v: "${v}/etc/xdg") drvs;
+
+  /*
+    Given a list of derivations, return a list of store paths appended with
+    `/share` suitable as part of the XDG_DATA_DIRS environment variable.
+  */
+  getXdgDataDirs = drvs:
+    builtins.map (v: "${v}/share") drvs;
 }

tests/lib/utils.nix

@@ -22,4 +22,26 @@ lib.runTests {
       "${../../modules}/libexec"
     ];
   };
+
+  testsUtilsGetXdgConfigDirs = {
+    expr = self.utils.getXdgConfigDirs [
+      ../../lib
+      ../../modules
+    ];
+    expected = [
+      "${../../lib}/etc/xdg"
+      "${../../modules}/etc/xdg"
+    ];
+  };
+
+  testsUtilsGetXdgDataDirs = {
+    expr = self.utils.getXdgDataDirs [
+      ../../lib
+      ../../modules
+    ];
+    expected = [
+      "${../../lib}/share"
+      "${../../modules}/share"
+    ];
+  };
 }