Implement installer logic

Author: amorphid

bin/install.sh

@@ -6,6 +6,11 @@ set -e
 # halt when referencing any unbound variable
 set -u
 
+
+out() { printf %s\\n "$*" ; }
+err() { >&2 printf %s\\n "$*" ; }
+die() { >&2 printf %s\\n "$*" ; exit 1 ; }
+
 display_help () {
  cat <<EOM
 Usage: install.sh [OPTIONS]
@@ -18,6 +23,28 @@ Options:
 EOM
 }
 
+install () {
+ if [[ ! "$(force_install?)" ]] && [[ -e "$(dst_file)" ]]; then
+ err "file already exists: ""$(dst_file)"
+ fi
+
+ local src_file="$(dirname "${0}")"/num
+
+ if ! cp "${src_file}" "$(dst_file)"; then
+ err "Unable to copy '${src_file}' to '$(dst_file)'"
+ fi
+}
+
+dst_file () {
+ local dst_dir="${NUM_INSTALL_DIR:-/usr/local/bin}"
+ mkdir -p "${dst_dir}"
+ out "${NUM_INSTALL_DIR:-/usr/local/bin}"/num
+}
+
+force_install? () {
+ echo "${NUM_FORCE_INSTALL:-""}"
+}
+
 parse_args () {
  if [[ $@ ]]; then
  case "${1}" in
@@ -35,8 +62,7 @@ parse_args () {
  exit 0
  ;;
  *)
- echo "invalid option: "${1} >&2
- exit 1
+ die "invalid option: ""${1}"
  ;;
  esac
 
@@ -47,4 +73,5 @@ parse_args () {
 # parse command line options
 parse_args $@
 
-# TODO: implement installer
+# install num
+install