feat: add copilot plugin

overlays/idea/default.nix

@@ -1,5 +1,53 @@
 final: prev: {
   jetbrains = prev.jetbrains // {
+    # Get info from site...
+    copilot-plugin-info = final.jetbrains.plugins.getUrl {
+      id = "17718";
+      hash = "sha256-Cjt/FMLVKR9RGmnM4pZLxgTuw+STbOkRO91HIEoacZ0=";
+    };
+    # Actually build the plugin
+    copilot-plugin = final.jetbrains.plugins.urlToDrv (final.jetbrains.copilot-plugin-info // {
+        hash = "sha256-XuQWI+kbck1BqnTvMfK6o85u9spksBkPhfcmFzs4VvI=";
+        extra = {
+          inputs = [prev.patchelf prev.glibc prev.gcc-unwrapped];
+          commands = let
+            libPath = prev.lib.makeLibraryPath [prev.glibc prev.gcc-unwrapped];
+          in ''
+            agent="copilot-agent/bin/copilot-agent-linux"
+            orig_size=$(stat --printf=%s $agent)
+            patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $agent
+            patchelf --set-rpath ${libPath} $agent
+            chmod +x $agent
+            new_size=$(stat --printf=%s $agent)
+            # https://github.com/NixOS/nixpkgs/pull/48193/files#diff-329ce6280c48eac47275b02077a2fc62R25
+            ###### zeit-pkg fixing starts here.
+            # we're replacing plaintext js code that looks like
+            # PAYLOAD_POSITION = '1234                  ' | 0
+            # [...]
+            # PRELUDE_POSITION = '1234                  ' | 0
+            # ^-----20-chars-----^^------22-chars------^
+            # ^-- grep points here
+            #
+            # var_* are as described above
+            # shift_by seems to be safe so long as all patchelf adjustments occur
+            # before any locations pointed to by hardcoded offsets
+            var_skip=20
+            var_select=22
+            shift_by=$(expr $new_size - $orig_size)
+            function fix_offset {
+              # $1 = name of variable to adjust
+              location=$(grep -obUam1 "$1" $agent | cut -d: -f1)
+              location=$(expr $location + $var_skip)
+              value=$(dd if=$agent iflag=count_bytes,skip_bytes skip=$location \
+                bs=1 count=$var_select status=none)
+              value=$(expr $shift_by + $value)
+              echo -n $value | dd of=$agent bs=1 seek=$location conv=notrunc
+            }
+            fix_offset PAYLOAD_POSITION
+            fix_offset PRELUDE_POSITION
+          '';
+        };
+      });
     jdk = prev.jetbrains.jdk.overrideAttrs (oldAttrs: rec {
       version = "17.0.4.1-linux-x64-b629.2";
       src = prev.fetchurl {
@@ -76,6 +124,7 @@ final: prev: {
         url = "https://download.jetbrains.com/idea/ideaIU-${version}-no-jbr.tar.gz";
         sha256 = "dFTX4Lj049jYBd3mRdKLhCEBvXeuqLKRJYgMWS5rjIU=";
       };
+      plugins = [final.jetbrains.copilot-plugin];
     });
   };
 }