provide a simpler case $ACTION API through docopts

[Sylvain303]

use case show_env is listed and not trigered, but create_target_group is remove from action list, but still in the if .. elif .. fi

WARNING: this bash eval at true

v=''
if $v ; then echo pipo; fi
#  will output pipo

example cli (snipet not tested)

# Usage:
#  ./run_migration.sh init
#  ./run_migration.sh add DESCRIPTION MIGRATION_FILE [--target_group=TARGET_GROUP]
#  ./run_migration.sh list
#  ./run_migration.sh run MIGRATION_JOBID
#  ./run_migration.sh delete MIGRATION_JOBID
#  ./run_migration.sh view MIGRATION_JOBID
#  ./run_migration.sh list_target_groups
#  ./run_migration.sh list_available_target
#  ./run_migration.sh list_databases [--server=SERVER_NAME] [--join]
#  ./run_migration.sh show_env
#  ./run_migration.sh -h
#

SCRIPT_DIR=$(dirname $0)
PATH=$SCRIPT_DIR:$PATH
# auto parse the script header and export ${ARGS[]} mapped argument
# docopts do all the magic parsing argument as defined in the doc header.
source docopts.sh --auto "$@"

## ======================================== main switch for arguments
if ${ARGS[add]}
then
  add_migration "${ARGS[DESCRIPTION]}" "${ARGS[MIGRATION_FILE]}" "${ARGS[--target_group]}"
elif ${ARGS[run]}
then
    if exec_migration_job ${ARGS[MIGRATION_JOBID]}
    then
      echo "migration in progress"
      exit 0
    fi
elif ${ARGS[list]}
then
  list_migration
elif ${ARGS[delete]}
then
  delete_migration_job "${ARGS[MIGRATION_JOBID]}"
elif ${ARGS[view]}
then
  view_migration "${ARGS[MIGRATION_JOBID]}"
elif ${ARGS[list_target_groups]}
then
  list_target_groups
elif ${ARGS[create_target_group]}
then
  create_target_group "${ARGS[TARGET_GROUP]}" "${ARGS[SERVER_NAME]}" DATABASE
elif ${ARGS[list_databases]}
then
  list_databases
elif ${ARGS[list_available_target]}
then
  list_available_target
else
  echo "error: unknown action"
fi 

Could we provide something like:

case ${ARGS[docopts_ACTIONS]} in
   add)
    ;;
   run)
    ;;
   list)
    ;;
   *)
    ;;
esac