install.sh

#!/bin/sh
set -eu

REPOSITORY="microsoft/shell-use"
BINARY_NAME="shell-use"

fail() {
  echo "Error: $*" >&2
  exit 1
}

command -v uname >/dev/null 2>&1 || fail "uname is required."
command -v tar >/dev/null 2>&1 || fail "tar is required."

case "$(uname -s)" in
  Darwin) OS="apple-darwin" ;;
  Linux) OS="unknown-linux-musl" ;;
  MINGW*|MSYS*|CYGWIN*)
    fail "Use install.ps1 to install shell-use on Windows."
    ;;
  *) fail "Unsupported operating system: $(uname -s)" ;;
esac

case "$(uname -m)" in
  x86_64|amd64) ARCH="x86_64" ;;
  arm64|aarch64) ARCH="aarch64" ;;
  *) fail "Unsupported architecture: $(uname -m)" ;;
esac

TARGET="${ARCH}-${OS}"
ASSET="${BINARY_NAME}-${TARGET}.tar.gz"
VERSION="${SHELL_USE_VERSION:-latest}"

if [ -z "$VERSION" ] || [ "$VERSION" = "latest" ]; then
  RELEASE_URL="https://github.com/${REPOSITORY}/releases/latest/download"
else
  case "$VERSION" in
    v*) ;;
    *) VERSION="v${VERSION}" ;;
  esac
  RELEASE_URL="https://github.com/${REPOSITORY}/releases/download/${VERSION}"
fi

DOWNLOAD_URL="${RELEASE_URL}/${ASSET}"
TOKEN="${GITHUB_TOKEN:-${GH_TOKEN:-}}"
TMP_DIR="$(mktemp -d 2>/dev/null || mktemp -d -t shell-use)"
ARCHIVE_PATH="${TMP_DIR}/${ASSET}"
EXTRACT_DIR="${TMP_DIR}/extract"

cleanup() {
  rm -rf -- "$TMP_DIR"
}
trap cleanup EXIT HUP INT TERM

download() {
  url="$1"
  destination="$2"

  if command -v curl >/dev/null 2>&1; then
    if [ -n "$TOKEN" ]; then
      curl --proto '=https' --tlsv1.2 -fsSL \
        -H "Authorization: Bearer ${TOKEN}" \
        "$url" -o "$destination"
    else
      curl --proto '=https' --tlsv1.2 -fsSL "$url" -o "$destination"
    fi
  elif command -v wget >/dev/null 2>&1; then
    if [ -n "$TOKEN" ]; then
      wget -q --header="Authorization: Bearer ${TOKEN}" \
        -O "$destination" "$url"
    else
      wget -q -O "$destination" "$url"
    fi
  else
    fail "curl or wget is required."
  fi
}

echo "Downloading shell-use for ${TARGET}..."
download "$DOWNLOAD_URL" "$ARCHIVE_PATH" ||
  fail "Could not download ${DOWNLOAD_URL}"

ARCHIVE_CONTENTS="$(tar -tzf "$ARCHIVE_PATH")" ||
  fail "Downloaded archive is invalid."
case "$ARCHIVE_CONTENTS" in
  "$BINARY_NAME"|"./$BINARY_NAME") ;;
  *) fail "Downloaded archive has unexpected contents." ;;
esac

mkdir -p "$EXTRACT_DIR"
tar -xzf "$ARCHIVE_PATH" -C "$EXTRACT_DIR"

if [ -n "${SHELL_USE_INSTALL_DIR:-}" ]; then
  INSTALL_DIR="$SHELL_USE_INSTALL_DIR"
elif [ -n "${PREFIX:-}" ]; then
  INSTALL_DIR="${PREFIX}/bin"
elif [ "$(id -u 2>/dev/null || echo 1)" -eq 0 ]; then
  INSTALL_DIR="/usr/local/bin"
else
  : "${HOME:?HOME is required when installing without root privileges.}"
  INSTALL_DIR="${HOME}/.local/bin"
fi

mkdir -p "$INSTALL_DIR" ||
  fail "Could not create ${INSTALL_DIR}. Set SHELL_USE_INSTALL_DIR to a writable directory."

DESTINATION="${INSTALL_DIR}/${BINARY_NAME}"
STAGED_DESTINATION="${INSTALL_DIR}/.${BINARY_NAME}.tmp.$$"
cp "${EXTRACT_DIR}/${BINARY_NAME}" "$STAGED_DESTINATION"
chmod 755 "$STAGED_DESTINATION"
mv -f "$STAGED_DESTINATION" "$DESTINATION"

echo "Installed shell-use to ${DESTINATION}"

case ":${PATH:-}:" in
  *":${INSTALL_DIR}:"*) exit 0 ;;
esac

CURRENT_SHELL="$(basename "${SHELL:-/bin/sh}")"
case "$CURRENT_SHELL" in
  zsh)
    RC_FILE="${ZDOTDIR:-$HOME}/.zprofile"
    PATH_LINE="export PATH=\"${INSTALL_DIR}:\$PATH\""
    ;;
  bash)
    if [ -f "$HOME/.bash_profile" ]; then
      RC_FILE="$HOME/.bash_profile"
    elif [ -f "$HOME/.bash_login" ]; then
      RC_FILE="$HOME/.bash_login"
    else
      RC_FILE="$HOME/.profile"
    fi
    PATH_LINE="export PATH=\"${INSTALL_DIR}:\$PATH\""
    ;;
  fish)
    RC_FILE="${XDG_CONFIG_HOME:-$HOME/.config}/fish/conf.d/shell-use.fish"
    PATH_LINE="fish_add_path \"${INSTALL_DIR}\""
    ;;
  *)
    RC_FILE="$HOME/.profile"
    PATH_LINE="export PATH=\"${INSTALL_DIR}:\$PATH\""
    ;;
esac

case "${SHELL_USE_NO_MODIFY_PATH:-}" in
  1|true|TRUE|yes|YES)
    echo "Add ${INSTALL_DIR} to PATH."
    exit 0
    ;;
esac

mkdir -p "$(dirname "$RC_FILE")"
if ! grep -Fqx "$PATH_LINE" "$RC_FILE" 2>/dev/null; then
  printf "\n%s\n" "$PATH_LINE" >>"$RC_FILE"
  echo "Added ${INSTALL_DIR} to PATH. Restart your shell."
fi