asdf/lib/commands/reshim.sh

reshim_command() {
  local plugin_name=$1
  local full_version=$2

  if [ -z "$plugin_name" ]; then
    local plugins_path
    plugins_path=$(get_plugin_path)

    if ls "$plugins_path" &> /dev/null; then
      for plugin_path in "$plugins_path"/* ; do
        plugin_name=$(basename "$plugin_path")
        reshim_command "$plugin_name"
      done
    fi
    return 0
  fi

  check_if_plugin_exists "$plugin_name"
  ensure_shims_dir

  if [ "$full_version" != "" ]; then
    # generate for the whole package version
    asdf_run_hook "pre_asdf_reshim_$plugin_name" "$full_version_name"
    generate_shims_for_version "$plugin_name" "$full_version"
    asdf_run_hook "post_asdf_reshim_$plugin_name" "$full_version"
  else
    # generate for all versions of the package
    local plugin_installs_path
    plugin_installs_path="$(asdf_data_dir)/installs/${plugin_name}"

    for install in "${plugin_installs_path}"/*/; do
      local full_version_name
      full_version_name=$(basename "$install" | sed 's/ref\-/ref\:/')
      asdf_run_hook "pre_asdf_reshim_$plugin_name" "$full_version_name"
      generate_shims_for_version "$plugin_name" "$full_version_name"
      remove_obsolete_shims "$plugin_name" "$full_version_name"
      asdf_run_hook "post_asdf_reshim_$plugin_name" "$full_version_name"
    done
  fi

}


ensure_shims_dir() {
  # Create shims dir if doesn't exist
  if [ ! -d "$(asdf_data_dir)/shims" ]; then
    mkdir "$(asdf_data_dir)/shims"
  fi
}


write_shim_script() {
  local plugin_name=$1
  local version=$2
  local executable_path=$3

  if ! is_executable "$executable_path"; then
    return 0
  fi

  local executable_name
  executable_name=$(basename "$executable_path")

  local shim_path
  shim_path="$(asdf_data_dir)/shims/$executable_name"

  if [ -f "$shim_path" ]; then
    if ! grep -x "# asdf-plugin: ${plugin_name} ${version}" "$shim_path" >/dev/null; then
     sed -i.bak -e "s/exec /# asdf-plugin: ${plugin_name} ${version}\\"$'\n''exec /' "$shim_path"
     rm "$shim_path".bak
    fi
  else
    cat <<EOF > "$shim_path"
#!/usr/bin/env bash
# asdf-plugin: ${plugin_name} ${version}
exec $(asdf_dir)/bin/asdf exec "${executable_name}" "\$@"
EOF
  fi

  chmod +x "$shim_path"
}


generate_shim_for_executable() {
  local plugin_name=$1
  local executable=$2

  check_if_plugin_exists "$plugin_name"

  local version
  IFS=':' read -r -a version_info <<< "$full_version"
  if [ "${version_info[0]}" = "ref" ]; then
    version="${version_info[1]}"
  else
    version="${version_info[0]}"
  fi

  write_shim_script "$plugin_name" "$version" "$executable"
}

generate_shims_for_version() {
  local plugin_name=$1
  local full_version=$2
  for executable_path in $(plugin_executables "$plugin_name" "$full_version"); do
    write_shim_script "$plugin_name" "$full_version" "$executable_path"
  done
}

remove_obsolete_shims() {
  local plugin_name=$1
  local full_version=$2

  local shims
  shims=$(plugin_shims "$plugin_name" "$full_version" | xargs -IX basename X | sort)

  local exec_names
  exec_names=$(plugin_executables "$plugin_name" "$full_version" | xargs -IX basename X | sort)

  local obsolete_shims
  obsolete_shims=$(comm -23 <(echo "$shims") <(echo "$exec_names"))

  for shim_name in $obsolete_shims; do
    remove_shim_for_version "$plugin_name" "$full_version" "$shim_name"
  done
}

remove_shim_for_version() {
  local plugin_name=$1
  local version=$2
  local shim_name

  shim_name=$(basename "$3")

  local shim_path
  shim_path="$(asdf_data_dir)/shims/$shim_name"

  local count_installed
  count_installed=$(list_installed_versions "$plugin_name" | wc -l)

  if ! grep -x "# asdf-plugin: $plugin_name $version" "$shim_path" > /dev/null 2>&1; then
    return 0
  fi

  sed -i.bak -e "/# asdf-plugin: $plugin_name $version"'$/d' "$shim_path"
  rm "$shim_path".bak

  if ! grep "# asdf-plugin:" "$shim_path" > /dev/null || \
      [ "$count_installed" -eq 0 ]; then
    rm "$shim_path"
  fi
}

remove_shims_for_version() {
  local plugin_name=$1
  local full_version=$2
  for shim_path in $(plugin_shims "$plugin_name" "$full_version"); do
    remove_shim_for_version "$plugin_name" "$full_version" "$shim_path"
  done
}