support for nimskull in v3 (#63)

* runner: there is no CaseTransition warning in nimskull

* ci: test against nimskull

* runner: disable refc and m&s for nimskull

nimskull does not have these GCs

* runner: disable c++ testing on nimskull

This backend no longer exists there

* ci: bump nimskull version to fix osproc bug

.github/workflows/ci.yml

@@ -30,8 +30,25 @@ jobs:
       fail-fast: false
       matrix:
         os: ['windows-latest', 'macos-latest', 'ubuntu-latest']
-        nim: ['devel', 'version-1-6', 'version-1-4', 'version-1-2', 'version-1-0']
-    name: '${{ matrix.os }} (${{ matrix.nim }})'
+        compiler:
+          - name: nim
+            version: devel
+          - name: nim
+            version: version-1-6
+          - name: nim
+            version: version-1-4
+          - name: nim
+            version: version-1-2
+          - name: nim
+            version: version-1-0
+          - name: nimskull
+            version: '^0.1.0-dev.21160'
+        exclude:
+          - os: windows-latest
+            compiler:
+              name: nimskull
+
+    name: '${{ matrix.os }} (${{ matrix.compiler.name }} ${{ matrix.compiler.version }})'
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
@@ -40,10 +57,38 @@ jobs:
           path: ci
 
       - name: Setup Nim
+        if: matrix.compiler.name == 'nim'
         uses: alaviss/[email protected]
         with:
           path: nim
-          version: ${{ matrix.nim }}
+          version: ${{ matrix.compiler.version }}
+
+      - name: Setup Nimskull
+        id: nimskull
+        if: matrix.compiler.name == 'nimskull'
+        uses: alaviss/setup-nimskull@f6e8ade8ac51191024616216e5da0ee968d9da48
+        with:
+          version: ${{ matrix.compiler.version }}
+
+      - if: matrix.compiler.name == 'nimskull'
+        name: Fetch nimble's fork for nimskull
+        uses: actions/checkout@v4
+        with:
+          path: nimble
+          repository: alaviss/nimble
+          ref: nimskull
+
+      - if: matrix.compiler.name == 'nimskull'
+        name: Build nimble and add to PATH
+        shell: bash
+        run: |
+          cd nimble
+          nim c -d:release -o:nimble src/nimble.nim
+          cp nimble "$NIMSKULL_BIN/nimble"
+          # Add nimble binary folder to PATH too
+          echo "$HOME/.nimble/bin" >> $GITHUB_PATH
+        env:
+          NIMSKULL_BIN: ${{ steps.nimskull.outputs.binPath }}
 
       - name: Run tests
         shell: bash
@@ -72,7 +117,8 @@ jobs:
       - name: Publish docs
         if: >
           github.event_name == 'push' && github.ref == 'refs/heads/master' &&
-          matrix.os == 'ubuntu-latest' && matrix.nim == 'devel'
+          matrix.os == 'ubuntu-latest' && matrix.compiler.name == 'nim' &&
+          matrix.compiler.version == 'devel'
         uses: crazy-max/ghaction-github-pages@v1
         with:
           build_dir: ci/docs

balls/runner.nim

@@ -239,7 +239,9 @@ proc hints*(p: Profile; ci: bool): string =
   omit = @[]
   if ci:
     # remove spam from ci logs
-    omit.add ["UnusedImport", "ProveInit", "CaseTransition"]
+    omit.add ["UnusedImport", "ProveInit"]
+    when not defined(isNimSkull):
+      omit.add "CaseTransition"
     when (NimMajor, NimMinor) >= (1, 2):
       omit.add "ObservableStores"
     when (NimMajor, NimMinor) >= (1, 4):
@@ -419,6 +421,10 @@ func nonsensical(p: Profile): bool =
     true
   elif p.fn == changeFileExt(p.fn, "nims") and p.gc != vm:
     true
+  elif defined(isNimSkull) and p.gc in {refc, markAndSweep}:
+    true
+  elif defined(isNimSkull) and p.be in {cpp}:
+    true
   else:
     false