static-nix-shell: add $dep/share to XDG_DATA_DIRS, also only add those $dep/bin paths which actually exist to PATH

this actually causes some packages which were previously wrapped to no longer require wrapping (because none of the directories they were adding actually existed)

pkgs/by-name/static-nix-shell/package.nix

@@ -76,11 +76,6 @@ in rec {
     # allow any package to be a list of packages, to support things like
     # -p python3.pkgs.foo.propagatedBuildInputs
     pkgsEnv' = lib.flatten pkgsEnv;
-
-    makeWrapperArgs = lib.optionals (pkgsEnv' != []) [
-      "--suffix" "PATH" ":" (lib.makeBinPath pkgsEnv')
-    ] ++ extraMakeWrapperArgs;
-    doWrap = makeWrapperArgs != [];
   in
     stdenv.mkDerivation (final: {
       version = "0.1.0";  # default version
@@ -90,7 +85,7 @@ in rec {
         makeBinaryWrapper
       ];
 
-      inherit makeWrapperArgs;
+      runtimePrefixes = pkgsEnv';
 
       patchPhase = ''
         substituteInPlace ${srcPath} \
@@ -102,6 +97,7 @@ in rec {
 
       installPhase = ''
         runHook preInstall
+
         mkdir -p $out/bin
         mv ${srcPath} $out/bin/${srcPath}
 
@@ -109,16 +105,33 @@ in rec {
           echo "$@"
           exit 1
         }
+
         # ensure that all nix-shell references were substituted
         (! grep '#![ \t]*nix-shell' $out/bin/${srcPath}) || die 'not all #!nix-shell directives were processed in ${srcPath}'
         # ensure that there weren't some trailing deps we *didn't* substitute
         grep '^# nix deps evaluated statically$' $out/bin/${srcPath} || die 'trailing characters in nix-shell directive for ${srcPath}'
 
-      '' + lib.optionalString doWrap ''
-        # add runtime dependencies to PATH
-        wrapProgram $out/bin/${srcPath} \
-          ${lib.escapeShellArgs final.makeWrapperArgs}
-      '' + ''
+        # wrap the program to place each dependency on PATH and XDG_DATA_DIRS:
+        concatTo runtimePrefixesList runtimePrefixes
+        extraPaths=
+        extraXdgDataDirs=
+        for p in "''${runtimePrefixesList[@]}"; do
+          echo "considering if dependency needs to be added to runtime environment(s): $p"
+          # `addToSearchPath` behaves as no-op if the provided path doesn't exist
+          addToSearchPath extraPaths "$p/bin"
+          addToSearchPath extraXdgDataDirs "$p/share"
+        done
+
+        if [ -n "$extraPaths" ]; then
+          makeWrapperArgs+=("--suffix" "PATH" ":" "$extraPaths")
+        fi
+        if [ -n "$extraXdgDataDirs" ]; then
+          makeWrapperArgs+=("--suffix" "XDG_DATA_DIRS" ":" "$extraXdgDataDirs")
+        fi
+        if [[ ''${#makeWrapperArgs[@]} != 0 ]]; then
+          wrapProgram $out/bin/${srcPath} \
+            "''${makeWrapperArgs[@]}"
+        fi
 
         runHook postInstall
       '';