name: Prune ESP-IDF install
description: >
  Remove the picolibc sysroots (1.1GB of the 3.9GB install) from the native
  ESP-IDF toolchains; IDF 5.x links newlib. Skipped when an IDF 6 install is
  present, which links picolibc (see esp32/__init__.py).
runs:
  using: composite
  steps:
    - name: Prune picolibc
      shell: bash
      run: |
        shopt -s nullglob
        prefix="${ESPHOME_ESP_IDF_PREFIX:-$HOME/.esphome-idf}"
        prefix="${prefix/#\~/$HOME}"
        for fw in "$prefix"/frameworks/*/; do
          case "$(basename "$fw")" in
            [6-9].*) echo "IDF $(basename "$fw") installed, keeping picolibc"; exit 0 ;;
          esac
        done
        n=0
        for dir in "$prefix"/tools/*-esp-elf/*/*-esp-elf/picolibc; do
          echo "Removing $dir ($(du -sh "$dir" | cut -f1))"
          rm -rf "$dir"
          n=$((n + 1))
        done
        # The marker rides along in the cache entry so a restored slim tree stays quiet.
        if [ "$n" -gt 0 ]; then
          touch "$prefix/.picolibc-pruned"
        elif [ -d "$prefix/tools" ] && [ ! -f "$prefix/.picolibc-pruned" ]; then
          echo "::warning::no picolibc sysroots matched under $prefix/tools"
        fi
        if [ -d "$prefix" ]; then
          du -sh "$prefix"
        fi