Add install shellcheck script

install-scripts/.local/bin/install-shellcheck-home

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+# shellcheck disable=SC1090
+source "${XDG_DATA_HOME}/buddy-up/includes/utils.sh"
+
+function get_os () {
+    case $(uname -s) in
+        Linux*)                 echo linux;;
+        Darwin*)                echo darwin;;
+        *) >&2 echo "unsupported os: $(uname -s)"; exit 1;;
+    esac
+}
+
+function get_arch () {
+    case $(uname -m) in
+        amd64*|x86_64*)     echo x86_64;;
+        arm|armv7*|armv6*)  echo armv6hf;;
+        aarch64*|armv8*)    echo aarch64;;
+        *) >&2 echo "unsupported architecture: $(uname -m)"; exit 1;;
+    esac
+}
+
+APP=shellcheck
+DEST="${XDG_DATA_HOME}/apps/releases/${APP}"
+CURRENT="${DEST}/current"
+VERSION=${VERSION:-0.7.2}
+URL=https://github.com/koalaman/shellcheck/releases/download/v${VERSION}/shellcheck-v${VERSION}.$(get_os).$(get_arch).tar.xz
+
+extract_tarball "${URL}" "${DEST}/${VERSION}" "--strip-components 1"
+set_current_link "${DEST}" "${VERSION}"
+
+unlink_if_set "${XDG_BIN_HOME}/${APP}"
+cd "${XDG_BIN_HOME}" || exit 1
+ln -s "$(relative_path "${XDG_BIN_HOME}" "${CURRENT}/${APP}")" "${APP}"
+cd - &> /dev/null || exit 1