install-shfmt.sh

#!/usr/bin/env bash
CURRENT_SHELL="${SHELL##*/}"
case "$CURRENT_SHELL" in
    'bash') SHELL_FILE="$(ls "$HOME"/.bashrc)" ;;
    'zsh') SHELL_FILE="$(ls "$HOME"/.zshrc)" ;;
    *) echo "Not a supported shell" && exit 1 ;;
esac

case "$(uname -m)" in
    'armv7l') ARCH=arm ;;
    'i386') ARCH=386 ;;
    'x86_64') ARCH=amd64 ;;
    *) echo "Not supported architecture" && exit 1 ;;
esac

if ! type -p shfmt > /dev/null 2>&1; then
    printf 'shfmt not installed\n'
    printf 'Fetching latest release...\n'
    LATEST_RELEASE="$(ver="$(curl https://github.com/mvdan/sh/releases.atom -s | grep '<title>v.*</title>' -m1)" && regex="(>.*<)" && [[ $ver =~ $regex ]] && echo "${BASH_REMATCH[1]:1:-1}")"
    printf "\033[1A\033[2K"
    printf "Latest Release: %s         \\n" "$LATEST_RELEASE"
    LINK=https://github.com/mvdan/sh/releases/download/"$LATEST_RELEASE"/shfmt_"$LATEST_RELEASE"_linux_"$ARCH"
    mkdir -p "$HOME"/.shfmt
    printf "Architecture=%s detected, downloading...\\n" "$ARCH"
    wget --show-progress -q "$LINK" -O "$HOME"/.shfmt/shfmt
    chmod +x "$HOME"/.shfmt/shfmt
    PATH="$HOME/.shfmt/:$PATH"
    export PATH
    echo -e "\nPATH=$HOME/.shfmt/:$PATH" >> "$SHELL_FILE"
    echo "shfmt installed"
    echo "shfmt --help"
else
    echo "shfmt already installed"
    echo "Path: $(type -p shfmt)"
fi