bash script to simplify handling of MRtrix3 modules

module

#!/bin/bash

if [[ $# != 2 ]]; then
  cat <<EOD
usage: ./module action target

where: 

  - action is one of: install update remove

  - target is the name of the module, either as its full URL, or in the format
    user/repo. When the install action is used, the user/repo format can be
    used only if the module is hosted on GitHub, and will be fetched via HTTPS. 

Examples:

./module install https://github.com/user/mymodule
./module install user/mymodule
./module update user/mymodule

./module install git@gitlab.com/other/private_module.git
./module update other/private_module

EOD
  exit 1
fi

# figure out full URL and short name from single argument:
module_URL=$2
module_name=$2

module_name=${module_name%.git}
module_name=$(echo $module_name | grep -o '[^/:]*/[^/]*$')

if [[ $module_URL == $module_name ]]; then
  module_URL='https://github.com/'$module_name
fi


# handle action argument:
case $1 in
  install)
    if [[ -d modules/$module_name ]]; then
      echo 'ERROR: module "'$module_name'" already exists - maybe you mean ./module update?'
      exit 1
    fi
    ( 
      set -e
      echo "## fetching $module_URL into modules/$module_name..."
      git clone $module_URL modules/$module_name
      cd modules/$module_name
      echo '## building module "'$module_name'"...'
      ../../../build
      echo '## adding module "'$module_name'" to PATH:'
      ../../../set_path
    )
    if [[ $? != 0 ]]; then
      echo 'ERROR occurred - cleaning up...'
      rm -rf modules/$module_name
    fi
    ;;
  remove)
    if [[ ! -d modules/$module_name ]]; then
      echo 'ERROR: no such module "'$module_name'"'
      exit 1
    fi

    echo '## removing module "'$module_name'"...'
    rm -rf modules/$module_name
    ;;
  update)
    (
      set -e
      echo '## updating modules "'$module_name'"...'
      cd modules/$module_name
      git pull
      echo '## building module "'$module_name'"...'
      ../../../build
      echo '## ensure module "'$module_name'" is in PATH:'
      ../../../set_path
    )
    ;;
 *) 
   echo 'no such action "'$1'"'
   exit 1
   ;;
esac