Change detection via git + rename githubToken to token (#9)

.github/filters.yml

@@ -1,2 +1,4 @@
+error:
+  - not_existing_path/**/*
 any:
   - "**/*"

.github/workflows/pull-request-verification.yml

@@ -16,24 +16,43 @@ jobs:
         npm install
         npm run all
 
-  test:
+  test-inline:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - uses: ./
       id: filter
-      with:
-        filters: '.github/filters.yml'
-    - uses: ./
-      id: inlineFilter
       with:
         filters: |
-          src:
-            - src/**/*
-          tests:
-            - __tests__/**/*
+          error:
+            - not_existing_path/**/*
           any:
             - "**/*"
     - name: filter-test
-      if: steps.filter.outputs.any != 'true' || steps.inlineFilter.outputs.any != 'true'
+      if: steps.filter.outputs.any != 'true' || steps.filter.outputs.error == 'true'
+      run: exit 1
+
+  test-external:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ./
+      id: filter
+      with:
+        filters: '.github/filters.yml'
+    - name: filter-test
+      if: steps.filter.outputs.any != 'true' || steps.filter.outputs.error == 'true'
+      run: exit 1
+
+  test-without-token:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ./
+      id: filter
+      with:
+        token: ''
+        filters: '.github/filters.yml'
+    - name: filter-test
+      if: steps.filter.outputs.any != 'true' || steps.filter.outputs.error == 'true'
       run: exit 1

README.md

@@ -21,7 +21,7 @@ Corresponding output variable will be created to indicate if there's a changed f
 Output variables can be later used in the `if` clause to conditionally run specific steps.
 
 ### Inputs
-- **`githubToken`**: GitHub Access Token - defaults to `${{ github.token }}`
+- **`token`**: GitHub Access Token - defaults to `${{ github.token }}`
 - **`filters`**: Path to the configuration file or directly embedded string in YAML format. Filter configuration is a dictionary, where keys specifies rule names and values are lists of file path patterns.
 
 ### Outputs
@@ -78,10 +78,11 @@ jobs:
 
 ## How it works
 
-1. Required inputs are checked (`githubToken` & `filters`)
-2. Provided access token is used to fetch list of changed files.
-3. For each filter rule it checks if there is any matching file
-4. Output variables are set
+1. Required inputs are checked (`filters`)
+2. If token was provided, it's used to fetch list of changed files from Github API.
+3. If token was not provided, base branch is fetched and changed files are detected using `git diff-index` command.
+4. For each filter rule it checks if there is any matching file
+5. Output variables are set
 
 ## Difference from related projects:
 

action.yml

@@ -2,9 +2,9 @@ name: 'Pull request changed files filter'
 description: 'Enables conditional execution of workflow job steps considering which files are modified by a pull request.'
 author: 'Michal Dorner <dorner.michal@gmail.com>'
 inputs:
-  githubToken:
+  token:
     description: 'GitHub Access Token'
-    required: true
+    required: false
     default: ${{ github.token }}
   filters:
     description: 'Path to the configuration file or YAML string with filters definition'