Accesses readarray for macOS using bash

.github/workflows/wheeltest.yml

@@ -18,7 +18,8 @@ jobs:
       - name: Checks out repo
         uses: actions/checkout@v4
 
-      - name: Set tags env variables.
+      - name: Set UBUNTU tags env variables.
+        if: matrix.os == 'ubuntu-latest'
         run: |
           # Set "checking" variable to false by default.
           echo "has_tags=false" >> $GITHUB_ENV
@@ -34,6 +35,30 @@ jobs:
             echo "spec_tags=${commit_message[1]}" >> $GITHUB_ENV
           fi
 
+      - name: Set macOS tags env variables.
+        if: (matrix.os == 'macos-13') || (matrix.os == 'macos-14')
+        run: |
+
+          # Get updated bash to access readarray
+          brew install bash
+          # Switch to bash for readarray
+          $(brew --prefix bash)/bin/bash
+          # Set "checking" variable to false by default.
+          echo "has_tags=false" >> $GITHUB_ENV
+          # Get your last commit message, not the merge commit.
+          text=$(git log -1 --no-merges --pretty=%B)
+          # Read the commit message into an array split by "#".
+          readarray -d "#" -t commit_message <<< "$text"
+          # Sanity check.
+          echo "the tags are: ${commit_message[1]}"
+          # Add tags and overwrite "checking" variable to true if there are tags.
+          if [[ "${commit_message[1]}" == *"@"*  ]]; then
+            echo "has_tags=true" >> $GITHUB_ENV
+            echo "spec_tags=${commit_message[1]}" >> $GITHUB_ENV
+          fi
+          # Switch back to zsh
+          /bin/zsh
+
       - name: Set up macOS-specific paths and libraries
         if: (matrix.os == 'macos-13') || (matrix.os == 'macos-14')
         run: |