Update README #18

README.md

@@ -11,33 +11,27 @@ See [action.yml](action.yml)
 Basic:
 ```yaml
 steps:
-- uses: actions/checkout@master
-- uses: jiro4989/setup-nim-action@v1
-  with:
-    nim-version: '1.2.0'
-- run: nimble build -Y
-- run: nimble test -Y
+  - uses: actions/checkout@master
+  - uses: jiro4989/setup-nim-action@v1
+    with:
+      nim-version: '1.2.0'
+  - run: nimble build -Y
+  - run: nimble test -Y
 ```
 
 Use cache:
 ```yaml
 steps:
-- uses: actions/checkout@master
-- name: Cache choosenim
-  id: cache-choosenim
-  uses: actions/cache@v1
-  with:
-    path: ~/.choosenim
-    key: ${{ runner.os }}-choosenim-stable
-- name: Cache nimble
-  id: cache-nimble
-  uses: actions/cache@v1
-  with:
-    path: ~/.nimble
-    key: ${{ runner.os }}-nimble-stable
-- uses: jiro4989/setup-nim-action@v1
-- run: nimble build -Y
-- run: nimble test -Y
+  - uses: actions/checkout@master
+  - name: Cache nimble
+    id: cache-nimble
+    uses: actions/cache@v1
+    with:
+      path: ~/.nimble
+      key: ${{ runner.os }}-nimble-${{ hashFiles('*.nimble') }}
+  - uses: jiro4989/setup-nim-action@v1
+  - run: nimble build -Y
+  - run: nimble test -Y
 ```
 
 Matrix Testing:
@@ -58,6 +52,41 @@ jobs:
       - run: nimble build
 ```
 
+Use `date` cache-key if you want to use `stable` or `devel` or `devel --latest` and caching.
+
+```yaml
+jobs:
+  test_devel:
+    runs-on: ubuntu-latest
+    env:
+      nim_version: 'devel'
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Get Date
+        id: get-date
+        run: echo "::set-output name=date::$(date "+%Y-%m-%d")"
+        shell: bash
+
+      - name: Cache choosenim
+        id: cache-choosenim
+        uses: actions/cache@v1
+        with:
+          path: ~/.choosenim
+          key: ${{ runner.os }}-choosenim-${{ env.nim_version }}-${{ steps.get-date.outputs.date }}
+      - name: Cache nimble
+        id: cache-nimble
+        uses: actions/cache@v1
+        with:
+          path: ~/.nimble
+          key: ${{ runner.os }}-nimble-${{ env.nim_version }}-${{ hashFiles('*.nimble') }}
+      - uses: jiro4989/setup-nim-action@v1
+        with:
+          nim-version: ${{ env.nim_version }}
+
+      - run: nimble build
+```
+
 # License
 
 MIT