improve nixbash

.aliases

@@ -99,8 +99,6 @@ alias nixpath="nix-build '<nixpkgs>' --no-build-output -A"
 
 alias nixcorrect="nix-shell -p --run 'bundle exec rubocop --format simple --config .rubocop.yml --auto-correct'"
 alias nixtodo="nix-shell -p --run 'bundle exec rubocop --format simple --config .rubocop.yml --auto-gen-config --no-auto-gen-timestamp'"
-alias nixbi="nix-shell -p zlib libxml2 postgresql sqlite libxslt shared-mime-info --run 'CFLAGS=-Wno-error=format-overflow bundle install'"
-alias nixbu="nix-shell -p zlib libxml2 postgresql sqlite libxslt shared-mime-info --run 'CFLAGS=-Wno-error=format-overflow bundle update'"
 
 # MISC
 # ====

.functions

@@ -215,3 +215,16 @@ nixpkg-install () {
 nixpkg-uninstall () {
   nix-env -e "${1}"
 }
+
+nixruby () {
+  freedesktop="$(nixpath shared-mime-info)"
+
+  nix-shell -p \
+            zlib \
+            libxml2 \
+            postgresql \
+            sqlite \
+            libxslt \
+            shared-mime-info \
+            --run "FREEDESKTOP_MIME_TYPES_PATH=${freedesktop}/share/mime/packages/freedesktop.org.xml ${*}"
+}