diff --git a/do.sh b/do.sh
deleted file mode 100644
index 0791209..0000000
--- a/do.sh
+++ /dev/null
@@ -1,69 +0,0 @@
-#!/usr/bin/env bash
-# Do - The Simplest Build Tool on Earth.
-# Documentation and examples see https://github.com/8gears/do
-
-set -Eeuo pipefail # -e "Automatic exit from bash shell script on error"  -u "Treat unset variables and parameters as errors"
-
-checknix() {
-	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
-		echo "In an interactive nix env."
-	else
-		echo "Using poetry as runner, no nix detected."
-	fi
-}
-
-build() {
-	echo "I am ${FUNCNAME[0]}ing"
-	poetry build
-}
-
-fmt() {
-	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
-		black .
-	else
-		poetry run black .
-	fi
-	find . -type f -name "*.py" -exec sed -i -e 's/    /\t/g' {} \;
-}
-
-test() {
-	echo "I am ${FUNCNAME[0]}ing"
-	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
-		flake8 pdme tests
-		mypy pdme
-		pytest
-	else
-		poetry run flake8 pdme tests
-		poetry run mypy pdme
-		poetry run pytest
-	fi
-}
-
-updatesnap() {
-	echo "I am ${FUNCNAME[0]}ing"
-	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
-		pytest --snapshot-update
-	else
-		poetry run pytest --snapshot-update
-	fi
-}
-
-htmlcov() {
-	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
-		pytest --cov-report=html
-	else
-		poetry run pytest --cov-report=html
-	fi
-}
-
-release() {
-	./scripts/release.sh
-}
-
-all() {
-	build && fmt && test
-}
-
-"$@" # <- execute the task
-
-[ "$#" -gt 0 ] || printf "Usage:\n\t./do.sh %s\n" "($(compgen -A function | grep '^[^_]' | paste -sd '|' -))"
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..452db8a
--- /dev/null
+++ b/justfile
@@ -0,0 +1,54 @@
+
+# execute default build
+default: build
+
+# builds the python module using poetry
+build:
+	echo "building..."
+	poetry build
+
+# print a message displaying whether nix is being used
+checknix:
+	#!/usr/bin/env bash
+	set -euxo pipefail
+	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
+		echo "In an interactive nix env."
+	else
+		echo "Using poetry as runner, no nix detected."
+	fi
+
+# run all tests
+test: fmt
+	#!/usr/bin/env bash
+	set -euxo pipefail
+	
+	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
+		echo "testing, using nix..."
+		flake8 pdme tests
+		mypy pdme
+		pytest
+	else
+		echo "testing..."
+		poetry run flake8 pdme tests
+		poetry run mypy pdme
+		poetry run pytest
+	fi
+
+# format code
+fmt:
+	#!/usr/bin/env bash
+	set -euxo pipefail
+	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
+	      black .
+	else
+		poetry run black .
+	fi
+	find pdme -type f -name "*.py" -exec sed -i -e 's/    /\t/g' {} \;
+	find tests -type f -name "*.py" -exec sed -i -e 's/    /\t/g' {} \;
+
+# release the app, checking that our working tree is clean and ready for release
+release:
+	./scripts/release.sh
+
+htmlcov:
+	poetry run pytest --cov-report=html