#!/bin/sh
# shellcheck disable=SC2034

test || __() { :; }

installer="https://git.io/shellspec"
repo="https://github.com/shellspec/shellspec.git"
archive="https://github.com/shellspec/shellspec/archive"
project="shellspec"
exec="shellspec"

set -eu && :<<'USAGE'
Usage: [sudo] ${0##*/} [VERSION] [OPTIONS...]
  or : wget -O- $installer | [sudo] sh
  or : wget -O- $installer | [sudo] sh -s -- [OPTIONS...]
  or : wget -O- $installer | [sudo] sh -s VERSION [OPTIONS...]
  or : curl -fsSL $installer | [sudo] sh
  or : curl -fsSL $installer | [sudo] sh -s -- [OPTIONS...]
  or : curl -fsSL $installer | [sudo] sh -s VERSION [OPTIONS...]

VERSION:
  Specify install version and method

  e.g
    1.0.0           Install 1.0.0 from git
    master          Install master from git
    1.0.0.tar.gz    Install 1.0.0 from tar.gz archive
    .               Install from local directory

OPTIONS:
  -p, --prefix PREFIX   Specify prefix                 [default: \$HOME/.local]
  -b, --bin BIN         Specify bin directory          [default: <PREFIX>/bin]
  -d, --dir DIR         Specify installation directory [default: <PREFIX>/lib/$project]
  -s, --switch          Switch version (requires installation via git)
  -l, --list            List available versions (tags)
      --pre             Include pre-release
      --fetch FETCH     Force command to use when installing from archive (curl or wget)
  -y, --yes             Automatic yes to prompts
  -h, --help            You're looking at it
USAGE

usage() {
  while IFS= read -r line && [ ! "${line#*:}" = \<\<"'$1'" ]; do :; done
  while IFS= read -r line && [ ! "$line" = "$1" ]; do set "$@" "$line"; done
  shift && [ $# -eq 0 ] || printf '%s\n' cat\<\<"$line" "$@" "$line"
}

CDPATH=''
[ "${ZSH_VERSION:-}" ] && setopt shwordsplit

finish() { done=1; exit "${1:-0}"; }
error() { printf '\033[31m%s\033[0m\n' "$1"; }
abort() { [ "${1:-}" ] && error "$1" >&2; finish 1; }
finished() { [ "$done" ] || error "Failed to install"; }

exists() {
  type "$1" >/dev/null 2>&1 && return 0
  ( IFS=:; for p in $PATH; do [ -x "${p%/}/$1" ] && return 0; done; return 1 )
}

prompt() {
  set -- "$1" "$2" "${3:-/dev/tty}"
  printf "%s " "$1"
  if eval "[ \"\$$2\" ] && :"; then
    eval "printf \"%s\n\" \"\$$2\""
  else
    IFS= read -r "$2" < "$3" || return 1
    [ "$3" = "/dev/tty" ] || eval "printf \"%s\n\" \"\$$2\""
  fi
}

is_yes() {
  case $1 in ( [Yy] | [Yy][Ee][Ss] ) return 0; esac
  return 1
}

confirm() {
  prompt "$@" || return 1
  eval "is_yes \"\$$2\" &&:"
}

fetch() {
  tmpfile="${TMPDIR:-${TMP:-/tmp}}/${1##*/}.$$"
  case $FETCH in
    curl) curl --head -sSfL -o /dev/null "$1" && curl -SfL "$1" ;;
    wget) wget --spider -q "$1" && wget -O- "$1" ;;
  esac > "$tmpfile" &&:
  error=$?
  if [ "$error" -eq 0 ]; then
    unarchive "$tmpfile" "$1" "$2" &&:
    error=$?
    [ "$error" -ne 0 ] && [ -d "$2" ]