add perl-rename to container and update related runtime scripts

api/default.nix

@@ -40,6 +40,7 @@ with pkgs; rec {
       gnutar
       gzip
       gnugrep
+      rename
       util-linux
     ];
 

runtimes/vlang.nix

@@ -15,11 +15,11 @@ in piston.mkRuntime {
         export TMPDIR="$PWD"
 
         # modify file extension
-        mv "$1" "$1.v"
-        filename="$1.v"
+        filename="$1"
+        rename 's/$/.v/' "$filename"
         shift
 
-        ${pkg}/bin/v run "$filename" "$@"
+        ${pkg}/bin/v run "$filename.v" "$@"
     '';
 
     tests = [

runtimes/zig.nix

@@ -8,7 +8,7 @@ in piston.mkRuntime {
 
     # Add .zig extension for compile script and optimize compiler for small programs
     compile = ''
-        for f; do mv "$f" "$f.zig"; done
+        rename 's/$/.zig/' "$@"
         ${pkg}/bin/zig build-exe -O ReleaseSafe --color off --cache-dir . --global-cache-dir . --name out *.zig
     '';