Grab an executable from github and install it to /usr/local/bin...

grab

#!/bin/bash

VER="0.2.0"

GR="\033[0;36m"
RD="\033[0;31m"
YL="\033[0;33m"
OF="\033[0m"

function msg {
    echo -e "$GR${1}$OF"
}

function warn {
    echo -e "$YL${1}$OF"
}

function err {
    echo -e "$RD${1}$OF"
}

msg "\ngrab version ${VER}"
msg "platform: ${OSTYPE}"

command -v wget >/dev/null 2>&1 || { err "wget not installed"; exit 1;} 
command -v unzip >/dev/null 2>&1 || { err "unzip not installed"; exit 1;} 
command -v tar >/dev/null 2>&1 || { err "tar not installed"; exit 1;} 
command -v curl >/dev/null 2>&1 || { err "curl not installed"; exit 1;} 

[ -z $1 ] && { err "1st arggument must be a github address in the format: user/repo"; exit 1; }
u="${1}"

if [ -z $2 ]; then
    ex=${1##*/}
    warn "2rd arggument (executable name) missing, assuming it is: ${ex}"
    e="${ex}"
else
    e="${2}"
fi

# grab list of released files from github
lst=$(curl -s "https://api.github.com/repos/${u}/releases/latest" | grep "browser_download_url" | grep "${e}" |  cut -d '"' -f 4 | xargs -n1 basename)

echo -e "\nchoose the version you would like to install:"
select choice in ${lst}; do
    if [[ -n $choice ]]; then
        a="${choice}"
        msg "\nYou chose to install ${a}"
        break
    else
        err "invalid choice, try again"
    fi
done


tmpf="/tmp/grab_cache_$$"
msg "creating cache in ${tmpf}"
mkdir "${tmpf}"

[ -d "${tmpf}" ] || { err "failed to create cache folder ${tmpf}"; exit 1; }

cd ${tmpf}

msg "downloading ${a} from github.com/${u}" 
wget -qN "https://github.com/${u}/releases/latest/download/${a}"
[ $? -ne 0 ] && { err "unable to download https://github.com/${u}/releases/latest/download/${a}"; exit 1; }

[ -f ${a} ] || { err "file ${a} not found"; rm -rf ${tmpf}; exit 1; }

ext="${a##*.}"
msg "archive type is ${ext}"

msg "extracting ${e} from ${a}..."

if [ $ext == "zip" ]; then
    unzip -oq ${a}
elif [ $ext == "gz" ]; then
    tar -xzf ${a} --strip-components 1
else
    err "unable to extract from ${ext}"
    rm -rf ${tmpf}
fi

[ $? -ne 0 ] && { err "unable to unzip ${a}"; rm -rf ${tmpf}; exit 1; }


msg "installing ${e} to /usr/local/bin..."
chmod +x ${e} 
sudo mv ${e} /usr/local/bin

[ -f /usr/local/bin/${e} ] || { err "failed to install ${e}"; rm -rf ${tmpf}; exit 1; }

msg "successfully installed"
warn "to uninstall: rm -f /usr/local/bin/${e}"

msg "cleaning up..."
rm -rf ${tmpf}

[ -d "${tmpf}" ] && { err "failed to delete cache folder ${tmpf}"; exit 1; }

msg "~*~ done\n"