home: direnv: add 'python' library file

home/direnv/lib/python.sh

@@ -0,0 +1,25 @@
+#shellcheck shell=bash
+
+layout_poetry() {
+    if ! has poetry; then
+        # shellcheck disable=2016
+        log_error 'layout_poetry: `poetry` is not in PATH'
+        return 1
+    fi
+
+    if [[ ! -f pyproject.toml ]]; then
+        # shellcheck disable=2016
+        log_error 'layout_poetry: no pyproject.toml found. Use `poetry new` or `poetry init` to create one first'
+        return 1
+    fi
+
+    # create venv if it doesn't exist
+    poetry run true
+
+    # shellcheck disable=2155
+    export VIRTUAL_ENV=$(poetry env info --path)
+    export POETRY_ACTIVE=1
+    PATH_add "$VIRTUAL_ENV/bin"
+    watch_file pyproject.toml
+    watch_file poetry.lock
+}