#!/usr/bin/env bash

set -euo pipefail

REPO="ufuayk/u"

BRANCH="macos"

ARCHIVE_URL="https://github.com/${REPO}/archive/refs/heads/${BRANCH}.tar.gz"

INSTALL_NAME="u"

# Update this after any change to u.rb or libr/:

# ( cd . && find u.rb libr -type f | LC_ALL=C sort | while IFS= read -r f; do shasum -a 256 "$f"; done ) | shasum -a 256 | awk '{print $1}'

EXPECTED_TREE_SHA="63e38c255f8f2311226cb6047ebee1dedf64b5526d80756305a6d638825c93a0"

info() { printf "\033[34m==>\033[0m %s\n" "$1"; }

ok() { printf "\033[32m✓\033[0m %s\n" "$1"; }

fail() { printf "\033[31m✗ %s\033[0m\n" "$1" >&2; exit 1; }

command -v ruby >/dev/null 2>&1 || fail "ruby not found. macOS ships Ruby by default — check your PATH."

command -v curl >/dev/null 2>&1 || fail "curl is required to install u."

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

USE_SUDO=""

if [ -w "/usr/local/bin" ]; then

DEST_DIR="/usr/local/bin"

elif command -v sudo >/dev/null 2>&1; then

DEST_DIR="/usr/local/bin"

USE_SUDO="sudo"

else

DEST_DIR="$HOME/.local/bin"

mkdir -p "$DEST_DIR"

fi

SHARE_DIR="$(dirname "$DEST_DIR")/share/u"

LAUNCHER="$DEST_DIR/$INSTALL_NAME"

info "Downloading u..."

TMP_DIR="$(mktemp -d)"

trap 'rm -rf "$TMP_DIR"' EXIT

curl -fsSL "$ARCHIVE_URL" -o "$TMP_DIR/u.tar.gz" || fail "download failed."

tar -xzf "$TMP_DIR/u.tar.gz" -C "$TMP_DIR" || fail "could not extract archive."

SRC_DIR="$(find "$TMP_DIR" -maxdepth 1 -type d -name 'u-*' -print -quit)"

if [ -z "$SRC_DIR" ] || [ ! -f "$SRC_DIR/u.rb" ]; then

fail "archive layout unexpected — aborting."

fi

if command -v shasum >/dev/null 2>&1; then

ACTUAL_TREE_SHA="$( ( cd "$SRC_DIR" && find u.rb libr -type f | LC_ALL=C sort | while IFS= read -r f; do shasum -a 256 "$f"; done ) | shasum -a 256 | awk '{print $1}' )"

[ "$ACTUAL_TREE_SHA" = "$EXPECTED_TREE_SHA" ] || fail "checksum mismatch — download may be corrupted or tampered with."

else

head -1 "$SRC_DIR/u.rb" | grep -q '^#!/usr/bin/env ruby' || fail "downloaded file doesn't look right — aborting."

fi

info "Installing to $SHARE_DIR..."

$USE_SUDO mkdir -p "$SHARE_DIR/libr"

$USE_SUDO cp "$SRC_DIR/u.rb" "$SHARE_DIR/u.rb"

$USE_SUDO cp "$SRC_DIR"/libr/*.rb "$SHARE_DIR/libr/"

$USE_SUDO chmod 755 "$SHARE_DIR/u.rb"

printf '#!/bin/sh\nexec ruby "%s" "$@"\n' "$SHARE_DIR/u.rb" > "$TMP_DIR/launcher"

$USE_SUDO chmod 755 "$TMP_DIR/launcher"

$USE_SUDO mv "$TMP_DIR/launcher" "$LAUNCHER"

ok "u installed at $LAUNCHER"

case ":$PATH:" in

*":$DEST_DIR:"*) ;;

*)

echo

printf "\033[33m!\033[0m %s is not on your PATH.\n" "$DEST_DIR"

echo " Add this to your shell profile (~/.zshrc or ~/.bashrc):"

echo

echo " export PATH=\"$DEST_DIR:\$PATH\""

echo

;;

esac

echo

ok "Done. Run 'u' to get started."