diff --git a/action.yml b/action.yml
index 0653675..d5ef748 100644
--- a/action.yml
+++ b/action.yml
@@ -69,42 +69,8 @@ runs:
         COMPILER: ${{ inputs.compiler }}
         VERSION: ${{ inputs.version }}
       run: |
-        action_path=$(echo '/${{ github.action_path }}' | sed -e 's/\\/\//g' -e 's/://')
-        source "$action_path/setup-fortran.sh"
-        
-        compiler=${COMPILER:-gcc}
-        platform=$(uname -s | tr '[:upper:]' '[:lower:]')
-
-        if [[ "$RUNNER_OS" == "macOS" ]] && [[ "$compiler" == "intel" ]]; then
-          echo "Compiler 'intel' not supported on macOS, falling back to 'intel-classic'"
-          compiler="intel-classic"
-        fi
-
-        case $compiler in
-          gcc)
-            version=${VERSION:-13}
-            install_gcc $platform
-            ;;
-          intel-classic)
-            version=${VERSION:-2023.2.0}
-            install_intel $platform true
-            ;;
-          intel)
-            version=${VERSION:-2025.0}
-            install_intel $platform false
-            ;;
-          nvidia-hpc)
-            version=${VERSION:-25.1}
-            install_nvidiahpc $platform
-            ;;
-          lfortran)
-            version=${VERSION:-0.45.0}
-            install_lfortran $platform
-            ;;
-          *)
-            exit 1
-            ;;
-        esac
+        cd $(echo '/${{ github.action_path }}' | sed -e 's/\\/\//g' -e 's/://')
+        source ./main.sh
 
         echo "FC=${FC}" >> $GITHUB_ENV
         echo "CC=${CC}" >> $GITHUB_ENV
diff --git a/main.sh b/main.sh
new file mode 100644
index 0000000..1fcf76f
--- /dev/null
+++ b/main.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -ex
+
+compiler=${COMPILER:-gcc}
+platform=$(uname -s | tr '[:upper:]' '[:lower:]')
+
+if [[ "$RUNNER_OS" == "macOS" ]] && [[ "$compiler" == "intel" ]]; then
+  echo "Compiler 'intel' not supported on macOS, falling back to 'intel-classic'"
+  compiler="intel-classic"
+fi
+
+source ./setup-fortran.sh
+
+case $compiler in
+  gcc)
+    version=${VERSION:-13}
+    install_gcc $platform
+    ;;
+  intel-classic)
+    version=${VERSION:-2023.2.0}
+    install_intel $platform true
+    ;;
+  intel)
+    version=${VERSION:-2025.0}
+    install_intel $platform false
+    ;;
+  nvidia-hpc)
+    version=${VERSION:-25.1}
+    install_nvidiahpc $platform
+    ;;
+  lfortran)
+    version=${VERSION:-0.45.0}
+    install_lfortran $platform
+    ;;
+  *)
+    exit 1
+    ;;
+esac