install.sh

#!/bin/bash

# ensures that the script exits immediately if an error occurs
set -euo pipefail

# installer script
# this downloads a github release executable for the current arch and installs it to the /usr/bin/ directory
#
# repo details:
REPO_OWNER="ellipticobj"
REPO_NAME="scrap"
EXEC_NAME="scrap"
INSTALL_PATH="/usr/bin/"

# tells the user what this script does
echo "this script downloads the latest release of ${REPO_OWNER}/${REPO_NAME} and installs it to ${INSTALL_PATH}"
echo "note: you may be prompted to input your password. this is to move the executable to ${INSTALL_PATH}"
echo "do you want to install?"
echo "enter y to continue or any other key to exit"
read -r -n 1 -s CONTINUE
if [ "$CONTINUE" != "y" ]; then
    echo "exiting..."
    exit 0
fi

# ensures that the current system is linux or macos
if [[ "$(uname)" != "Linux" && "$(uname)" != "Darwin" ]]; then
    echo "error: this script only supports linux and macos."
    exit 1
fi

# check for dependancies (curl grep and sed)
for cmd in curl grep sed; do
    if ! command -v "$cmd" >/dev/null 2>&1; then
        echo "error: $cmd is not installed."
        exit 1
    fi
done

# use jq if available
if command -v jq >/dev/null 2>&1; then
    USE_JQ=true
else
    USE_JQ=false
fi

# arch detection
ARCH=$(uname -m)
case "$ARCH" in
    x86_64)
        ARCH="x86_64"
        ;;
    aarch64|arm64)
        ARCH="arm64"
        ;;
  *)
    echo "Unsupported architecture: $ARCH"
    exit 1
    ;;
esac

# gets latest release
API_URL="https://api.github.com/repos/${REPO_OWNER}/${REPO_NAME}/releases/latest"
if [ "$USE_JQ" = true ]; then
    LATEST=$(curl -s "$API_URL" | jq -r '.tag_name')
else
    LATEST=$(curl -s "$API_URL" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
fi

if [ -z "$LATEST" ]; then
    echo "failed to fetch the latest release"
    echo "visit https://github.com/${REPO_OWNER}/${REPO_NAME}/releases/latest to manually download the executable."
    exit 1
fi

# gets download url
# this assumes your release asset is named like this: EXEC_NAME-ARCH (e.g. scrap-x86_64)
DOWNLOAD_URL="https://github.com/${REPO_OWNER}/${REPO_NAME}/releases/download/${LATEST}/${EXEC_NAME}-${ARCH}"
echo "downloading executable from $DOWNLOAD_URL"

# downloading
curl -L -o "${EXEC_NAME}" "$DOWNLOAD_URL"
if [ $? -ne 0 ]; then
    echo "download failed"
    exit 1
fi

# makes the file executable.
chmod +x "$EXEC_NAME"

# moves the executable to /usr/bin.
echo "moving executable to ${INSTALL_PATH}${EXEC_NAME}"
sudo mv "${EXEC_NAME}" "${INSTALL_PATH}${EXEC_NAME}"

echo "installed to ${INSTALL_PATH}${EXEC_NAME}"