xf

#!/bin/bash

VERSION_NUMBER=1.0.0

usage() {
cat << EOF
Usage: xf

COMMANDS:
  --help, -h               
    Show this message

  --version, -v            
    Show version

  init <path>              
    Initialize cmd project. Uses current working 
    directory if no path is given.

  ls                       
    List available commands

  <command> [options]
    Run the specified command
EOF
}

show_cmd_version() {
  echo "xf v$VERSION_NUMBER"
}

find_project_root() {
  while [[ ! -a .xf ]]
  do
    cd ..
    # using dev/null because it always? exists at root
    # need to find a better way of identifying root directory
    if [[ -a dev/null ]]
    then
      echo "ERROR: No .xf file found"
      exit 1 # no cmd files found
    fi
  done
  PROJECT_PATH=.
}

list_all_commands() {
  find $PROJECT_PATH -perm +111 -type f -not -path "*.git*"
}

find_command() {
  list_all_commands | grep $1$
}

select_command() {
  echo "Multiple matches found:"
  echo $1 | tr ' ' '\n' > /tmp/xfcommands
  cat -n /tmp/xfcommands
  echo "Enter the command you want to execute:"
  read command_number
  command=$(sed -n "$command_number p" < /tmp/xfcommands)
}

exit_no_such_cmd() {
  echo "ERROR: No such command"
  exit 1 # no command to run
}

if [[ -z "$1" ]] # if no arguments were given, print usage
then
  show_cmd_version
  usage
  exit 1
elif [[ $1 = "--help" ]] || [[ $1 = "-h" ]]
then
  usage
  exit 0
elif [[ $1 = "--version" ]] || [[ $1 = "-v" ]]
then
  show_cmd_version
  exit 0
elif [[ $1 = "init" ]]
then
  # use specified path if it exists
  if [[ -z "$2" ]]
  then 
    PROJECT_PATH=.
  else
    PROJECT_PATH=$2
  fi

  touch $PROJECT_PATH/.xf
  exit 0
else
  find_project_root

  if [[ $1 = "ls" ]]
  then
    list_all_commands
  else
    command=$(find_command $1)
    count=`echo $command | wc -w`
    if [[ $count -eq 0 ]]
    then
      exit_no_such_cmd
    elif [[ $count -ne 1 ]]
    then
      select_command "$command"
    fi

    $command ${@:2:$#}
    exit $?
  fi
fi