Add script to install chezmoi for initial setup

.chezmoiignore

@@ -1,4 +1,5 @@
 /README.md
+/scripts/
 {{ if .include_legacy }}
 /dot_local/bin/duck-encoder.jar
 {{ end }}

scripts/install-chezmoi

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+XDG_BIN_HOME=${XDG_BIN_HOME:-${HOME}/.local/bin}
+XDG_DATA_HOME=${XDG_DATA_HOME:-${HOME}/.local/share}
+XDG_CONFIG_HOME=${XDG_CONFIG_HOME:-${HOME}/.config}
+
+SCRIPTS_DIR=$(dirname "$0")
+REPO_DIR=${SCRIPTS_DIR}/..
+INCLUDES_DIR=${REPO_DIR}/dot_local/share/buddy-up/includes
+
+# shellcheck disable=SC1091
+source "${INCLUDES_DIR}/utils.sh"
+
+APP=chezmoi
+VERSION=${VERSION:-2.33.6}
+DEST=${XDG_DATA_HOME}/apps/releases/${APP}
+
+main() (
+	URL=https://github.com/twpayne/chezmoi/releases/download/v${VERSION}/chezmoi_${VERSION}_$(get_os)_$(get_arch).tar.gz
+
+	extract_tarball "${URL}" "${DEST}/${VERSION}"
+	set_current_link "${DEST}" "${VERSION}"
+	set_link "${XDG_BIN_HOME}/${APP}" "${DEST}" "${APP}"
+	set_link "${XDG_CONFIG_HOME}/bash/bashrc.d/chezmoi.sh" "${DEST}" "completions/chezmoi-completion.bash"
+	set_link "${XDG_CONFIG_HOME}/zsh/zshrc.d/chezmoi.zsh" "${DEST}" "completions/chezmoi.zsh"
+	set_link "${XDG_CONFIG_HOME}/fish/completions/chezmoi.fish" "${DEST}" "completions/chezmoi.fish"
+	set_link "${XDG_DATA_HOME}/doc/chezmoi" "${DEST}" "docs"
+)
+
+get_arch() (
+	case $(uname -m) in
+	x86_64*) echo amd64 ;;
+	*)
+		echo >&2 "unsupported architecture: $(uname -m)"
+		exit 1
+		;;
+	esac
+)
+
+main "${@}"