name: "Get Images From Files"
description: "Extract docker images from selected files (Dockerfiles, Kubernetes manifests, Docker Compose/compose files, Helmfile values, and files with recognizable image references)"
author: "Timo Behrendt <t.behrendt@t00n.de>"
branding:
  icon: "package"
  color: "blue"

inputs:
  files:
    description: "Files to extract images from. Multiple files can be specified (YAML list format)."
    required: true

outputs:
  images:
    description: "Comma-separated list of extracted image references (e.g. docker.io/library/alpine:latest,gcr.io/distroless/static:nonroot@sha256:...)"
    value: ${{ steps.extract.outputs.images }}

runs:
  using: "composite"
  steps:
    - id: extract
      shell: bash
      run: |
        set -e
        files="${{ inputs.files }}"
        # Parse YAML list: lines like "  - path/to/file" or "- file"
        file_list=$(echo "$files" | sed -n 's/^[[:space:]]*-[[:space:]]*//p' | tr -d '"' | tr -d "'")
        images=$(
          for f in $file_list; do
            [ -f "$f" ] || continue
            # Dockerfile: FROM [--platform=...] <image>
            awk '/^[[:space:]]*FROM[[:space:]]/ { print $NF }' "$f" 2>/dev/null || true
            # Kubernetes / Docker Compose: image: <ref>
            grep -E '[[:space:]]image:[[:space:]]' "$f" 2>/dev/null | sed 's/.*image:[[:space:]]*//' | awk '{ print $1 }' || true
            # Helmfile values: repository (required), tag optional (by indent); tag without repo is skipped
            awk '
              match($0, /^[[:space:]]*/) { indent = RLENGTH }
              /^[[:space:]]*repository:[[:space:]]/ {
                v = $0; sub(/^[^:]*:[[:space:]]*"?/, "", v); sub(/"?[[:space:]]*$/, "", v); repo[indent] = v;
                if (tag[indent] != "") { print repo[indent] ":" tag[indent] } else { print repo[indent] };
                delete repo[indent]; delete tag[indent]; next
              }
              /^[[:space:]]*tag:[[:space:]]/ {
                v = $0; sub(/^[^:]*:[[:space:]]*"?/, "", v); sub(/"?[[:space:]]*$/, "", v); tag[indent] = v;
                if (repo[indent] != "") { print repo[indent] ":" tag[indent]; delete repo[indent]; delete tag[indent] } else { delete tag[indent] }; next
              }
            ' "$f" 2>/dev/null || true
          done | grep -E '/' | sort -u | paste -sd,
        )
        echo "images=${images:-}" >> "$GITHUB_OUTPUT"