name: Replace Build Placeholders
description: >
  Ersetzt {{BUILD_VAR_*}}-Platzhalter in allen Textdateien durch Gitea-Actions-Build-Infos
  (Commit, Branch, Run-Metadaten, …). Sprachunabhängig (reiner Text-Replace,
  kein Build-Tool-Bezug), kein Input nötig.
runs:
  using: composite
  steps:
    - shell: bash
      run: |
        set -euo pipefail

        SHA_SHORT="${GITHUB_SHA:0:7}"
        BUILD_DATE="$(date -u '+%Y-%m-%dT%H:%M:%SZ')"

        # Same label as the docker-build image tag: pr-<n> for PRs, else ref name with / -> -
        REF="${GITHUB_REF:-}"
        if [[ "$REF" == refs/pull/* ]]; then
          PR_NUM="${REF#refs/pull/}"
          REF_LABEL="pr-${PR_NUM%%/*}"
        else
          REF_NAME="${GITHUB_REF_NAME:-}"
          REF_LABEL="${REF_NAME//\//-}"
        fi

        declare -A VARS=(
          [BUILD_VAR_GITHUB_SHA]="${GITHUB_SHA:-}"
          [BUILD_VAR_GITHUB_REF_NAME]="${GITHUB_REF_NAME:-}"
          [BUILD_VAR_GITHUB_REF_TYPE]="${GITHUB_REF_TYPE:-}"
          [BUILD_VAR_GITHUB_REPOSITORY]="${GITHUB_REPOSITORY:-}"
          [BUILD_VAR_GITHUB_REPOSITORY_OWNER]="${GITHUB_REPOSITORY_OWNER:-}"
          [BUILD_VAR_GITHUB_RUN_ID]="${GITHUB_RUN_ID:-}"
          [BUILD_VAR_GITHUB_RUN_NUMBER]="${GITHUB_RUN_NUMBER:-}"
          [BUILD_VAR_GITHUB_RUN_ATTEMPT]="${GITHUB_RUN_ATTEMPT:-}"
          [BUILD_VAR_GITHUB_RETENTION_DAYS]="${GITHUB_RETENTION_DAYS:-}"
          [BUILD_VAR_GITHUB_SERVER_URL]="${GITHUB_SERVER_URL:-}"
          [BUILD_VAR_GITHUB_EVENT_NAME]="${GITHUB_EVENT_NAME:-}"
          [BUILD_VAR_GITHUB_BASE_REF]="${GITHUB_BASE_REF:-}"
          [BUILD_VAR_GITHUB_HEAD_REF]="${GITHUB_HEAD_REF:-}"
          [BUILD_VAR_GITHUB_ACTION_REF]="${GITHUB_ACTION_REF:-}"
          [BUILD_VAR_GITHUB_ACTION_REPOSITORY]="${GITHUB_ACTION_REPOSITORY:-}"
          [BUILD_VAR_GITEA_ACTIONS_RUNNER_VERSION]="${GITEA_ACTIONS_RUNNER_VERSION:-}"
          [BUILD_VAR_COMMIT_SHA_SHORT]="$SHA_SHORT"
          [BUILD_VAR_BUILD_DATE]="$BUILD_DATE"
          [BUILD_VAR_REF_LABEL]="$REF_LABEL"
        )

        SED_ARGS=()
        for key in "${!VARS[@]}"; do
          SED_ARGS+=(-e "s|{{${key}}}|${VARS[$key]}|g")
        done

        grep -rIl --exclude-dir=.git '' . | xargs -r sed -i "${SED_ARGS[@]}"