Check update for apps I downloaded directly instead of through a package manager

update.sh

#!/bin/zsh

# return the latest TAG version from GitHub repo (usually include "v" prefix)
get_github_latest_tag() {
    local repo_path=$1
    curl -s -I -L "https://github.com/$repo_path/releases/latest" | \
    grep -i "^location" | \
    tail -n1 | \
    sed -E 's|.*/tag/([^/]+)$|\1|' | \
    tr -d '\r'
}

is_url_alive() {
    local url=$1
    local status_code=$(curl -s -o /dev/null -w "%{http_code}" "$url")

    # Consider 2xx and 3xx status codes as "alive"
    if [[ $status_code -ge 200 && $status_code -lt 400 ]]; then
        return 0  # URL is alive
    else
        return 1  # URL is not alive
    fi
}

check_gh_update() {
    local command=$1
    local repo_path=$2
    local version_extract_cmd=$3
    local file_name=$4

    if [[ ! -x "$(command -v $command)" ]]; then
        return
    fi

    local curr_ver=$(eval "$version_extract_cmd")
    local latest_tag=$(get_github_latest_tag "$repo_path")
    local latest_ver=$(echo "$latest_tag" | sed -E 's/^v//g')

    if [[ "$file_name" =~ "<VERSION>" ]]; then
        file_name=${file_name//<VERSION>/$latest_ver}
    fi

    if [[ "$curr_ver" != "$latest_ver" ]]; then
        local direct_dl_link="https://github.com/$repo_path/releases/download/$latest_tag/$file_name"
        if is_url_alive "$direct_dl_link"; then
            echo "$command: $curr_ver -> $latest_ver"
            echo -e "  - 🔗 \033[32m$direct_dl_link\033[0m"
            echo
        else
            echo "$command: $curr_ver -> $latest_ver"
            echo -e "  - 🏠 \033[33mhttps://github.com/$repo_path/releases/latest\033[0m"
            echo
        fi
    else
        echo "$command: up to date\n"
    fi
}

check_gh_update "fastfetch" "fastfetch-cli/fastfetch" "fastfetch --version | head -n1 | sed -E 's|.* ([0-9.]+).*|\1|'" "fastfetch-linux-amd64.zip"
check_gh_update "onefetch" "o2sh/onefetch" "onefetch --version | head -n1 | sed -E 's|.* ([0-9.]+).*|\1|'" "onefetch-linux.tar.gz"
check_gh_update "fzf" "junegunn/fzf" "fzf --version | sed -E 's/([0-9]+\.[0-9]+\.[0-9]+).*/\1/'" "fzf-<VERSION>-linux_amd64.tar.gz"
check_gh_update "just" "casey/just" "just --version | head -n1 | sed -E 's|.* ([0-9.]+).*|\1|'" "just-<VERSION>-x86_64-unknown-linux-musl.tar.gz"
check_gh_update "lazygit" "jesseduffield/lazygit" "lazygit --version | grep -oP 'version=\K[0-9.]+' | head -n1" "lazygit_<VERSION>_Linux_x86_64.tar.gz"
check_gh_update "lazydocker" "jesseduffield/lazydocker" "lazydocker --version | grep -oP 'Version: \K[0-9.]+' | head -n1" "lazydocker_<VERSION>_Linux_x86_64.tar.gz"

check_ncdu() {
    local current_version=$(ncdu --version | sed -E 's/ncdu ([0-9.]+)/\1/')
    local latest_version=$(curl -s "https://dev.yorhel.nl/ncdu" | grep -oP '/download/ncdu-\K[0-9.]+(?=-linux-x86_64\.tar\.gz)' | head -n1)
    local direct_dl_link="https://dev.yorhel.nl/download/ncdu-$latest_version-linux-x86_64.tar.gz"
    local page_to_dl_link="https://dev.yorhel.nl/ncdu"

    if [[ ! -x "$(command -v ncdu)" ]]; then
        return
    fi

    if [[ "$current_version" != "$latest_version" ]]; then
        if is_url_alive "$direct_dl_link"; then
            echo "ncdu: $current_version -> $latest_version"
            echo "  - 🔗 \033[32m$direct_dl_link\033[0m"
            echo
        else
            echo "ncdu: $current_version -> $latest_version"
            echo "  - 🏠 \033[33m$page_to_dl_link\033[0m"
            echo
        fi
    else
        echo "ncdu: up to date\n"
    fi
}

check_ncdu