Use script to check changed files instead for dorny/paths-filter@v2 in action workflows. (#994)

* use script to check changed files instead for dorny/paths-filter@v2

Author: lollipopjin

.github/workflows/build.yml

@@ -32,7 +32,7 @@ jobs:
             REPO_OWNER=${{ github.repository_owner }}
             REPO_NAME=${{ github.event.repository.name }}
 
-            # calling GitHub API for changed files in PR
+            # calling GitHub API for changed files in PR, the result is in string format.
             CHANGED_FILES=$(curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
               "https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/pulls/$PR_NUMBER/files" | \
               jq -r '.[].filename' | tr '\n' ' ')
@@ -44,7 +44,7 @@ jobs:
       - name: Check Java changes
         id: java
         run: |
-          if echo "${{ steps.changed_files.outputs.files }}" | grep -qE '^(java/|pom.xml)'; then
+          if echo "${{ steps.changed_files.outputs.files }}" | tr  ' ' '\n'| grep -qE '^(java/|pom.xml)'; then
             echo "::set-output name=java::true"
           else
             echo "::set-output name=java::false"
@@ -53,7 +53,7 @@ jobs:
       - name: Check C++ changes
         id: cpp
         run: |
-          if echo "${{ steps.changed_files.outputs.files }}" | grep -qE '^cpp/'; then
+          if echo "${{ steps.changed_files.outputs.files }}" | tr  ' ' '\n'| grep -qE '^cpp/'; then
             echo "::set-output name=cpp::true"
           else
             echo "::set-output name=cpp::false"
@@ -62,7 +62,7 @@ jobs:
       - name: Check Golang changes
         id: golang
         run: |
-          if echo "${{ steps.changed_files.outputs.files }}" | grep -qE '^golang/'; then
+          if echo "${{ steps.changed_files.outputs.files }}" | tr  ' ' '\n' | grep -qE '^golang/'; then
             echo "::set-output name=golang::true"
           else
             echo "::set-output name=golang::false"
@@ -71,7 +71,7 @@ jobs:
       - name: Check C# changes
         id: csharp
         run: |
-          if echo "${{ steps.changed_files.outputs.files }}" | grep -qE '^csharp/'; then
+          if echo "${{ steps.changed_files.outputs.files }}" | tr  ' ' '\n' | grep -qE '^csharp/'; then
             echo "::set-output name=csharp::true"
           else
             echo "::set-output name=csharp::false"
@@ -80,7 +80,7 @@ jobs:
       - name: Check PHP changes
         id: php
         run: |
-          if echo "${{ steps.changed_files.outputs.files }}" | grep -qE '^php/'; then
+          if echo "${{ steps.changed_files.outputs.files }}" | tr  ' ' '\n' | grep -qE '^php/'; then
             echo "::set-output name=php::true"
           else
             echo "::set-output name=php::false"
@@ -89,7 +89,7 @@ jobs:
       - name: Check Rust changes
         id: rust
         run: |
-          if echo "${{ steps.changed_files.outputs.files }}" | grep -qE '^rust/'; then
+          if echo "${{ steps.changed_files.outputs.files }}" | tr  ' ' '\n' | grep -qE '^rust/'; then
             echo "::set-output name=rust::true"
           else
             echo "::set-output name=rust::false"
@@ -98,7 +98,7 @@ jobs:
       - name: Check Python changes
         id: python
         run: |
-          if echo "${{ steps.changed_files.outputs.files }}" | grep -qE '^python/'; then
+          if echo "${{ steps.changed_files.outputs.files }}" | tr  ' ' '\n' | grep -qE '^python/'; then
             echo "::set-output name=python::true"
           else
             echo "::set-output name=python::false"
@@ -107,7 +107,7 @@ jobs:
       - name: Check Node.js changes
         id: nodejs
         run: |
-          if echo "${{ steps.changed_files.outputs.files }}" | grep -qE '^nodejs/'; then
+          if echo "${{ steps.changed_files.outputs.files }}" | tr  ' ' '\n' | grep -qE '^nodejs/'; then
             echo "::set-output name=nodejs::true"
           else
             echo "::set-output name=nodejs::false"