diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..545353a
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+
+(
+	set -euo pipefail
+
+	now="$(date +%Y-%m-%d)"
+	if [[ -s .direnv/pull-date && "$now" = "$(cat .direnv/pull-date)" ]]; then
+		return 0
+	fi
+
+	prints_true() {
+		[[ "$("$@" 2>/dev/null)" = "true" ]]
+	}
+
+	git_dot_git_dir() {
+		if prints_true git rev-parse --is-inside-work-tree; then
+			git rev-parse --git-dir 2>/dev/null
+		fi
+	}
+
+	gdot="$(git_dot_git_dir)"
+	[ -n "$gdot" ] || return 1
+
+	if [[ -f "$gdot/rebase-merge/interactive" ]]; then
+		printf >&2 "%s\n" "REBASE-i"
+		return 1
+	elif [[ -d "$gdot/rebase-merge" ]]; then
+		printf >&2 "%s\n" "REBASE-m"
+		return 1
+	elif [[ -d "$gdot/rebase-apply" ]]; then
+		printf >&2 "%s\n" "AM/REBASE"
+		return 1
+	elif [[ -f "$gdot/MERGE_HEAD" ]]; then
+		printf >&2 "%s\n" "MERGING"
+		return 1
+	elif [[ -f "$gdot/CHERRY_PICK_HEAD" ]]; then
+		printf >&2 "%s\n" "CHERRY-PICKING"
+		return 1
+	elif [[ -f "$gdot/BISECT_LOG" ]]; then
+		printf >&2 "%s\n" "BISECTING"
+		return 1
+	fi
+
+	git pull --rebase --autostash
+
+	mkdir -p .direnv/
+	printf "%s\n" "$now" >.direnv/pull-date
+)
diff --git a/.gitignore b/.gitignore
index 22f4fa3..99f64da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 !/justfile
 !/.gitignore
 !/clean.sh
+!/.envrc