Normalise nimble (#36)

* normalise nimble file, ci / deprecation fixes

* other deprecations

.github/workflows/ci.yml

@@ -6,6 +6,10 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency: # Cancel stale PR builds (but not push builds)
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
 jobs:
   build:
     strategy:
@@ -43,10 +47,10 @@ jobs:
 
     name: '${{ matrix.target.os }}-${{ matrix.target.cpu }} (Nim ${{ matrix.branch }})'
     runs-on: ${{ matrix.builder }}
-    continue-on-error: ${{ matrix.branch == 'version-1-6' || matrix.branch == 'devel' }}
+    continue-on-error: ${{ matrix.branch == 'devel' }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Install build dependencies (Linux i386)
         if: runner.os == 'Linux' && matrix.target.cpu == 'i386'
@@ -94,23 +98,23 @@ jobs:
         id: windows-dlls-cache
         uses: actions/cache@v2
         with:
-          path: external/dlls
-          key: 'dlls'
+          path: external/dlls-${{ matrix.target.cpu }}
+          key: 'dlls-${{ matrix.target.cpu }}'
 
-      - name: Install DLL dependencies (Windows)
+      - name: Install DLLs dependencies (Windows)
         if: >
           steps.windows-dlls-cache.outputs.cache-hit != 'true' &&
           runner.os == 'Windows'
         run: |
-          mkdir external
+          mkdir -p external
           curl -L "https://nim-lang.org/download/windeps.zip" -o external/windeps.zip
-          7z x external/windeps.zip -oexternal/dlls
+          7z x -y external/windeps.zip -oexternal/dlls-${{ matrix.target.cpu }}
 
       - name: Path to cached dependencies (Windows)
         if: >
           runner.os == 'Windows'
         run: |
-          echo '${{ github.workspace }}'"/external/dlls" >> $GITHUB_PATH
+          echo "${{ github.workspace }}/external/dlls-${{ matrix.target.cpu }}" >> $GITHUB_PATH
 
       - name: Derive environment variables
         run: |
@@ -152,5 +156,5 @@ jobs:
           nim --version
           nimble --version
           nimble install -y --depsOnly
-          env TEST_LANG="c" nimble test
-          env TEST_LANG="cpp" nimble test
+          env NIMLANG=c nimble test
+          env NIMLANG=cpp nimble test