chore: add install.sh

.chezmoiignore

@@ -13,3 +13,4 @@
 .config/waybar
 launch-sway.sh
 {{ end }}
+install.sh

install.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+# -e: exit on error
+# -u: exit on unset variables
+set -eu
+
+if ! chezmoi="$(command -v chezmoi)"; then
+  bin_dir="${HOME}/.local/bin"
+  chezmoi="${bin_dir}/chezmoi"
+  echo "Installing chezmoi to '${chezmoi}'" >&2
+  if command -v curl >/dev/null; then
+    chezmoi_install_script="$(curl -fsSL get.chezmoi.io)"
+  elif command -v wget >/dev/null; then
+    chezmoi_install_script="$(wget -qO- get.chezmoi.io)"
+  else
+    echo "To install chezmoi, you must have curl or wget installed." >&2
+    exit 1
+  fi
+  sh -c "${chezmoi_install_script}" -- -b "${bin_dir}"
+  unset chezmoi_install_script bin_dir
+fi
+
+# POSIX way to get script's dir: https://stackoverflow.com/a/29834779/12156188
+script_dir="$(cd -P -- "$(dirname -- "$(command -v -- "$0")")" && pwd -P)"
+
+set -- init --apply --source="${script_dir}"
+
+echo "Running 'chezmoi $*'" >&2
+# exec: replace current process with chezmoi
+exec "$chezmoi" "$@"