Replace snapshot printer with scip CLI

CONTRIBUTING.md

@@ -56,7 +56,9 @@ These are the main components of the project.
 | `snapshots/testOnly tests.MinimizedSnapshotSuite`                   | sbt      | Runs fast snapshot tests. Indexes a small set of files under `tests/minimized`.     |
 | `snapshots/testOnly tests.MinimizedSnapshotSuite -- *InnerClasses*` | sbt      | Runs only individual tests cases matching the name "InnerClasses".                  |
 | `snapshots/test`                                                    | sbt      | Runs all snapshot tests.                                                            |
-| `snapshots/run`                                                     | sbt      | Update snapshot tests. Use this command after you have fixed a bug.                 |
+| `snapshots/run`                                                     | sbt      | Update only the Java snapshot goldens under `tests/snapshots`.                      |
+| `scipKotlincMinimized/kotlincSnapshots`                             | sbt      | Update only the Kotlin snapshot goldens under `scip-kotlinc/minimized`.             |
+| `regenerateSnapshots`                                               | sbt      | Regenerate ALL snapshot goldens (Java + Kotlin). Run after fixing a bug.            |
 | `cli/run --cwd DIRECTORY`                                           | sbt      | Run `scip-java` command-line tool against a given Gradle/Maven build.               |
 | `fixAll`                                                            | sbt      | Run Scalafmt, Scalafix and Javafmt on all sources. Run this before opening a PR.    |
 

build.sbt

@@ -72,6 +72,11 @@ commands +=
       "scalafixAll --check" :: "publishLocal" :: s
   }
 
+commands +=
+  Command.command("regenerateSnapshots") { s =>
+    "snapshots/run" :: "scipKotlincMinimized/kotlincSnapshots" :: s
+  }
+
 // Shared module with the SCIP shard utilities (symbol encoder, document
 // builder, on-disk writer) consumed by both the Java compiler plugin
 // (scip-javac) and the Kotlin compiler plugin (scip-kotlinc).
@@ -480,15 +485,23 @@ lazy val scipKotlincMinimized = project
           val snapDir =
             (baseDirectory.value / "src" / "generatedSnapshots" / "resources")
               .getAbsolutePath
-          val scipOut = s"$tgtRoot/index.scip"
+          // Write the aggregated index OUTSIDE the scanned targetroot. If it
+          // lived under `tgtRoot`, a second `kotlincSnapshots` run would feed
+          // the previous index.scip back into `aggregate`, which re-applies the
+          // package prefix and yields doubled symbols
+          // (e.g. `scip-java maven . . scip-java maven . . kotlin/`).
+          val indexDir = target.value / "scip-index"
+          IO.createDirectory(indexDir)
+          val scipOut = (indexDir / "index.scip").getAbsolutePath
           val mainCls = "com.sourcegraph.scip_java.ScipJava"
           Def.sequential(
             Compile / compile,
             (cli / Compile / runMain).toTask(
               s" $mainCls aggregate --no-emit-inverse-relationships --cwd $srcRoot --output $scipOut $tgtRoot"
             ),
             (cli / Compile / runMain).toTask(
-              s" $mainCls snapshot --cwd $srcRoot --output $snapDir $tgtRoot"
+              s" $mainCls snapshot --cwd $srcRoot --output $snapDir ${indexDir
+                  .getAbsolutePath}"
             )
           )
         }

flake.nix

@@ -6,18 +6,23 @@
     nixpkgs = {
       url = "github:NixOS/nixpkgs/nixos-25.11";
     };
+    scip = {
+      url = "github:scip-code/scip";
+    };
   };
 
   outputs =
     {
       self,
       flake-utils,
       nixpkgs,
+      scip,
     }:
     flake-utils.lib.eachDefaultSystem (
       system:
       let
         pkgs = import nixpkgs { inherit system; };
+        scipCli = scip.packages.${system}.default;
         mkDevShell =
           jdk:
           pkgs.mkShellNoCC {
@@ -32,6 +37,7 @@
               nodejs
               (sbt.override ({ jre = jdk; }))
               scalafmt
+              scipCli
               yarn
             ];
           };