.stack-prefix.yml

name: .Stack Prefix
on:
  workflow_call:
    outputs:
      STACK_PREFIX: 
        description: 'The Stack Prefix'
        value: ${{ jobs.prefix.outputs.STACK_PREFIX }}
jobs:
  prefix:
    name: Stack Prefix
    runs-on: ubuntu-24.04
    outputs:
      STACK_PREFIX: ${{ steps.stack-prefix.outputs.STACK_PREFIX }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Generate Stack Prefix
        id: stack-prefix
        shell: bash
        run: |
          # Get repository name
          REPO_NAME="${{ github.event.repository.name }}"

          # If repo name is less than 20 characters, use it directly
          if [[ ${#REPO_NAME} -lt 20 ]]; then
            STACK_PREFIX="${REPO_NAME}"
          else
            # Split by hyphen or underscore and get first letter of each word
            PREFIX=$(echo "$REPO_NAME" | 
                    awk -v RS='[-_]' '{printf "%s", tolower(substr($0,1,1))}' | 
                    tr -d '\n')

            # Ensure at least 4 characters without repetition
            while [[ ${#PREFIX} -lt 4 ]]; do
              # Concatenate with the next letter in the sequence (avoiding randomness)
              SUFFIX="${PREFIX: -1}"  # Get the last character of the current PREFIX
              INDEX=$(( $(echo "$PREFIX" | grep -o "$SUFFIX" | wc -l) + 1 ))  # Get the index of the next character
              NEXT_CHAR=$(echo "$PREFIX" | cut -c $INDEX)  # Get the next character
              PREFIX="${PREFIX}${NEXT_CHAR}"
            done

            # Truncate if prefix exceeds 10 characters
            if [[ ${#PREFIX} -gt 10 ]]; then
              PREFIX="${PREFIX:0:10}"
            fi

            STACK_PREFIX="${PREFIX}"
          fi

          # Set output
          echo "STACK_PREFIX=$STACK_PREFIX" >> $GITHUB_OUTPUT
          echo "Generated prefix: $STACK_PREFIX"