Add dependency check to project step runs

requirements.txt

@@ -33,5 +33,6 @@ hypothesis>=3.27.0,<7.0.0
 mypy>=0.910,<0.970; platform_machine!='aarch64'
 types-dataclasses>=0.1.3; python_version < "3.7"
 types-mock>=0.1.1
+types-setuptools>=57.0.0
 types-requests
 black>=22.0,<23.0

spacy/cli/project/run.py

@@ -1,5 +1,8 @@
-from typing import Optional, List, Dict, Sequence, Any, Iterable
+from typing import Optional, List, Dict, Sequence, Any, Iterable, Tuple
+import os.path
 from pathlib import Path
+
+import pkg_resources
 from wasabi import msg
 from wasabi.util import locale_escape
 import sys
@@ -71,6 +74,12 @@ def project_run(
     commands = {cmd["name"]: cmd for cmd in config.get("commands", [])}
     workflows = config.get("workflows", {})
     validate_subcommand(list(commands.keys()), list(workflows.keys()), subcommand)
+
+    req_path = project_dir / "requirements.txt"
+    if os.path.exists(req_path):
+        with req_path.open() as requirements_file:
+            _validate_requirements([req.replace("\n", "") for req in requirements_file])
+
     if subcommand in workflows:
         msg.info(f"Running workflow '{subcommand}'")
         for cmd in workflows[subcommand]:
@@ -308,3 +317,32 @@ def get_fileinfo(project_dir: Path, paths: List[str]) -> List[Dict[str, Optional
         md5 = get_checksum(file_path) if file_path.exists() else None
         data.append({"path": path, "md5": md5})
     return data
+
+
+def _validate_requirements(requirements: List[str]) -> Tuple[bool, bool]:
+    """Checks whether requirements are installed and free of version conflicts.
+    requirements (List[str]): List of requirements.
+    RETURNS (Tuple[bool, bool]): Whether (1) any packages couldn't be imported, (2) any packages with version conflicts
+        exist.
+    """
+
+    failed_pkgs_msgs: List[str] = []
+    conflicting_pkgs_msgs: List[str] = []
+
+    for req in requirements:
+        try:
+            pkg_resources.require(req)
+        except pkg_resources.DistributionNotFound as dnf:
+            failed_pkgs_msgs.append(dnf.report())
+        except pkg_resources.VersionConflict as vc:
+            conflicting_pkgs_msgs.append(vc.report())
+
+    if len(failed_pkgs_msgs) or len(conflicting_pkgs_msgs):
+        msg.warn(
+            title="Missing requirements or requirement conflicts detected. Make sure your Python environment is set up "
+            "correctly and you installed all requirements specified in your project's requirements.txt: "
+        )
+        for pgk_msg in failed_pkgs_msgs + conflicting_pkgs_msgs:
+            msg.text(pgk_msg)
+
+    return len(failed_pkgs_msgs) > 0, len(conflicting_pkgs_msgs) > 0

spacy/tests/package/test_requirements.py

@@ -17,6 +17,7 @@ def test_build_dependencies():
         "types-dataclasses",
         "types-mock",
         "types-requests",
+        "types-setuptools",
     ]
     # ignore language-specific packages that shouldn't be installed by all
     libs_ignore_setup = [