selector_gemsets

#!/usr/bin/env bash

__rvm_gemset_handle_default()
{
  rvm_gemset_name="@${rvm_gemset_name:-}@"
  rvm_gemset_name="${rvm_gemset_name/@default@/@@}"
  rvm_gemset_name="${rvm_gemset_name#@}"
  rvm_gemset_name="${rvm_gemset_name%@}"
}

__rvm_gemset_select_cli_validation()
{
  typeset orig_gemset

  if ! builtin command -v gem > /dev/null
  then
    rvm_log "'gem' command not found, cannot select a gemset."
    return 0
  fi

  orig_gemset="${rvm_gemset_name:-}"
  __rvm_gemset_handle_default

  # No longer defaulting to 'sticky' gem sets.
  # Set 'rvm_sticky_flag=1' in ~/.rvmrc to enable.
  if [[ -z "${rvm_gemset_name:-}"  && "$orig_gemset" != "default" && ${rvm_sticky_flag:-0} -eq 1 ]]
  then
    if [[ -n "${rvm_ruby_gem_home:-}" ]]
    then
      rvm_gemset_name="$rvm_ruby_gem_home"
    elif [[ -n "${GEM_HOME:-}" ]]
    then
      rvm_gemset_name="$GEM_HOME"
    fi
    rvm_gemset_name="${rvm_gemset_name##*/}"
    rvm_gemset_name="${rvm_gemset_name#*${rvm_gemset_separator:-"@"}}"
  fi

  if [[ -z "${rvm_ruby_string:-}" && -n "${GEM_HOME:-}" && -n "${GEM_HOME%@*}" ]]
  then
    rvm_ruby_string="${GEM_HOME%@*}"
    rvm_ruby_string="${rvm_ruby_string##*/}"
  fi

  if [[ -z "${rvm_ruby_string:-}" ]]
  then
    rvm_error "Gemsets can not be used with non rvm controlled rubies (currently)."
    return 3
  fi
}

__rvm_gemset_select_only()
{
  rvm_ruby_gem_home="${rvm_gems_path:-"$rvm_path/gems"}/$rvm_ruby_string"

  : rvm_ignore_gemsets_flag:${rvm_ignore_gemsets_flag:=0}:
  if (( rvm_ignore_gemsets_flag ))
  then
    rvm_ruby_global_gems_path="${rvm_ruby_gem_home}"
    rvm_ruby_gem_path="${rvm_ruby_gem_home}"
    rvm_gemset_name=""
  else
    rvm_ruby_global_gems_path="${rvm_ruby_gem_home}${rvm_gemset_separator:-"@"}global"

    __rvm_gemset_handle_default
    [[ -z "$rvm_gemset_name" ]] ||
      rvm_ruby_gem_home="${rvm_ruby_gem_home}${rvm_gemset_separator:-"@"}${rvm_gemset_name}"

    if [[ "$rvm_gemset_name" == "global" ]]
    then
      rvm_ruby_gem_path="${rvm_ruby_gem_home}"
    else
      rvm_ruby_gem_path="${rvm_ruby_gem_home}:${rvm_ruby_global_gems_path}"
    fi
  fi

  if [[ -n "${rvm_gemset_name}" ]]
  then
    rvm_env_string="${rvm_ruby_string}@${rvm_gemset_name}"
  else
    rvm_env_string=${rvm_ruby_string}
  fi
}

__rvm_gemset_select_validation()
{
  # If the gemset does not exist, then notify the user as such and abort the action.
  if [[ ! -d "${rvm_ruby_gem_home}" ]]
  then
    if (( ${rvm_gemset_create_on_use_flag:=0} == 0 && ${rvm_create_flag:=0} == 0 && ${rvm_delete_flag:=0} == 0 ))
    then
      rvm_expected_gemset_name="${rvm_gemset_name}"
      rvm_gemset_name=""
      __rvm_gemset_select_only
      return 2
    fi
  elif (( ${rvm_delete_flag:=0} == 1 ))
  then
    return 4
  fi
}

__rvm_gemset_select_ensure()
{
  \mkdir -p "$rvm_ruby_gem_home"

  if __rvm_using_gemset_globalcache && [[ ! -L "$rvm_ruby_gem_home/cache" ]]
  then
    : rvm_gems_cache_path:${rvm_gems_cache_path:=${rvm_gems_path:-"$rvm_path/gems"}/cache}
    \mv "$rvm_ruby_gem_home/cache/"*.gem "$rvm_gems_cache_path/" 2>/dev/null
    __rvm_rm_rf "$rvm_ruby_gem_home/cache"
    \ln -fs "$rvm_gems_cache_path" "$rvm_ruby_gem_home/cache"
  fi
}

# Select a gemset based on CLI set options and environment.
__rvm_gemset_select_cli()
{
  __rvm_gemset_select_cli_validation &&
  __rvm_gemset_select
}

__rvm_gemset_select()
{
  __rvm_gemset_select_only &&
  __rvm_gemset_select_validation &&
  __rvm_gemset_select_ensure
}

# Use a gemset specified by 'rvm_ruby_gem_home'
__rvm_gemset_use()
{
  if __rvm_gemset_select_cli
  then
    rvm_log "Using $rvm_ruby_string with gemset ${rvm_gemset_name:-default}"
    __rvm_use # Now ensure the selection takes effect for the environment.
  else
    if [[ ! -d "$rvm_ruby_gem_home" || -n "${rvm_expected_gemset_name}" ]]
    then
      if (( ${rvm_gemset_create_on_use_flag:=0} == 1 || ${rvm_create_flag:=0} == 1 ))
      then
        rvm_warn "gemset $rvm_gemset_name is not existing, creating."
        "$rvm_scripts_path/gemsets" create "$rvm_gemset_name"
      else
        rvm_error "Gemset '${rvm_expected_gemset_name}' does not exist, 'rvm gemset create ${rvm_expected_gemset_name}' first, or append '--create'."
        return 2
      fi
    else
      rvm_error "Gemset was not given.\n  Usage:\n    rvm gemset use <gemsetname>\n"
      return 1
    fi
  fi
}

__rvm_gemset_clear()
{
  export rvm_gemset_name
  rvm_gemset_name=""
  __rvm_use # Now ensure the selection takes effect for the environment.
}