loop_this

#!/usr/bin/env bash
#
# Public: Executes a given command in a given number of times.
#
# - size: number of times that the command will be executed.
# - command: the command that will be executed.
#
# Modifiers:
#
# DONT_STOP: if this environment variable is set, the given
# command will be execute in the given times, even if it does not
# return success.
#
# Examples
#
#     # will execute the `ls` command 5 times.
#     loop_this 5 ls
#
#     # will execute the `rspec` 10 times, even if the command return something
#     # different from 0.
#     DONT_STOP=1 loop_this 10 rspec
###############################################################################

params=($(echo "$@"))
cmd="${params[@]:1}"
size=${params[0]}
build_count=0
error_count=0

cmd=$(echo $cmd | sed "s/'/'\\''/g")

report() {
  echo -e "\n\nkilled: << Build $build_count (failed: $error_count) >>\n\n"
  exit $error_count
}; trap report SIGINT SIGTERM

while [ $build_count -lt $size ]
do
  echo ">> Build $((++build_count)) (failed: $error_count)"
  echo ">> $cmd"
  $cmd
  if [[ $? != 0 ]]
  then
    error_count=$(($error_count + 1))
    if [[ "$DONT_STOP" = "" ]]
    then
      break
    fi
  fi
  echo ""
done

echo -e "\nBuilds: $build_count (failed: $error_count)\n"
exit $error_count