ci: Continuously invoke a command when input files change

ci

#!/bin/sh
#
# ci: Continuously invoke a command when input files change
#
# Requires inotifywait, from inotify-tools:
#   # apt-get install inotify-tools
#   # yum install inotify-tools
#
# Conrad Parker 2015

THIS="ci"

############################################################
## help
############################################################

ci_help() {
  echo >&2 "ci: Continuously invoke a command when input files change"
  echo >&2
  echo >&2 "Usage: ci [command] ..."
  echo >&2
  echo >&2 "Options:"
  echo >&2 "  -l CMD, --list CMD          Command that lists files to watch"
  echo >&2
  echo >&2 "Miscellaneous options"
  echo >&2 "  -n, --dry-run               Don't actually run commands, print"
  echo >&2 "  -h, --help                  Display this help"
  echo >&2 "  -v, --verbose               Print informative messages"
  echo >&2
  exit 1
}

############################################################
## General functions
############################################################

ci_verbose_echo () {
  if test "x$CI_QUIET" = "x"; then
    echo $THIS: $*
  fi
}

#
# ci_try_run desc cmd
#
ci_try_run () {
  desc=$1
  shift

  ci_verbose_echo ==========================================================================
  ci_verbose_echo $desc ...

  if test "x$CI_DRY_RUN" != "x" || test "x$CI_QUIET" = "x"; then
    echo $*
  fi
  if test "x$CI_DRY_RUN" = "x" ; then
    eval $*
    if test "$?" != "0"; then
      echo $*
      #exit 1
    fi
  fi
}

############################################################
## Cleanup
############################################################

# exit status
stat=1

cleanup () {
  exit $stat
}

trap cleanup 0

############################################################
## Continuously invoke
############################################################

continuously_invoke () {
  while true; do
   eval $CI_LIST | inotifywait $CI_QUIET -e modify --fromfile -
   ci_try_run "$CI_COMMAND" $CI_COMMAND
  done
}

############################################################
## Main
############################################################

CI_DRY_RUN=""
CI_QUIET="-q"
CI_LIST=""
CI_COMMAND=""

GETOPTEST=`getopt --version`
SHORTOPTS="nhvl:"

case $GETOPTEST in
  getopt*) # GNU getopt
    TEMP=`getopt -l dry-run -l help -l verbose -l "list:" -- +$SHORTOPTS "$@"`
    ;;
  *) # POSIX getopt ?
    TEMP=`getopt $SHORTOPTS "$@"`
    ;;
esac

if test "$?" != "0"; then
  ci_help
fi

eval set -- "$TEMP"

while test "x$1" != "x--" ; do
  case "$1" in
    -n | --dry-run)
      CI_DRY_RUN="y"
      CI_QUIET=""
      ;;
    -v | verbose)
      CI_QUIET=""
      ;;
    -h | --help)
      ci_help
      ;;
    -l | --list)
      CI_LIST="$2"
      shift
      ;;
  esac
  shift
done

# Check that all options parsed ok
if test "x$1" != "x--"; then
  ci_help
  return
fi
shift # Get rid of the '--'

CI_COMMAND=$*

continuously_invoke

# Set exit status to 0
stat=0