recipetool: create: add support for crates

diff --git a/scripts/lib/recipetool/create_cargo.py b/scripts/lib/recipetool/create_cargo.py
new file mode 100644
index 00000000000..d24ce63509c
--- /dev/null
+++ b/scripts/lib/recipetool/create_cargo.py
@@ -0,0 +1,125 @@ 
+# Recipe creation tool - cargo support plugin
+#
+# Copyright (c) 2023 BayLibre, SAS
+# Author: Julien Stephan <jstephan@baylibre.com>
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
+import logging
+import os
+from recipetool.create import RecipeHandler
+
+logger = logging.getLogger("recipetool")
+
+tinfoil = None
+
+
+def tinfoil_init(instance):
+    global tinfoil
+    tinfoil = instance
+
+
+class CargoRecipeHandler(RecipeHandler):
+    """
+    Base class to support rust crate
+    """
+
+    # The supported metadata list
+    # Exaustive list available here: https://doc.rust-lang.org/cargo/reference/manifest.html#the-manifest-format
+    manifest_package_table = [
+        "name",
+        "version",
+        "homepage",
+        "description",
+        "license",
+        "license-file",
+        "dependencies",
+    ]
+
+    bbvar_map = {
+        "name": "PN",
+        "version": "PV",
+        "homepage": "HOMEPAGE",
+        "description": "SUMMARY",
+        "license": "LICENSE",
+    }
+
+    def __init__(self):
+        pass
+
+    def process(
+        self, srctree, classes, lines_before, lines_after, handled, extravalues
+    ):
+        if "buildsystem" in handled:
+            return False
+
+        # Check for non-zero size Cargo.toml file
+        manifestfiles = RecipeHandler.checkfiles(srctree, ["Cargo.toml"])
+        for fn in manifestfiles:
+            if os.path.getsize(fn):
+                break
+        else:
+            return False
+
+        manifest = os.path.join(srctree, "Cargo.toml")
+
+        lockfile = RecipeHandler.checkfiles(srctree, ["Cargo.lock"])
+        if lockfile == []:
+            logger.error(
+                "No cargo lock found, this is not yet supported, falling back to another method"
+            )
+            return False
+
+        try:
+            import tomllib
+        except ImportError:
+            try:
+                import tomli as tomllib
+            except ImportError:
+                logger.exception(
+                    "Neither 'tomllib' nor 'tomli' could be imported. Please use python3.11 or above or install tomli module"
+                )
+                return False
+            except Exception:
+                logger.exception("Failed to parse pyproject.toml")
+                return False
+
+        try:
+            with open(manifest, "rb") as f:
+                config = tomllib.load(f)
+
+            metadata = config["package"]
+
+            if metadata:
+                for field, value in metadata.items():
+                    if field in self.manifest_package_table:
+                        if field == "license":
+                            # license field is an SPDX 2.1 license expression
+                            # https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields
+                            value = value.replace("AND", "&")
+                            value = value.replace("OR", "|")
+                            # even if deprecated we can still find some old crate using "/" to separate mulitple licenses
+                            value = value.replace("/", " & ")
+                        elif field == "license-file":
+                            # TODO: handle this properly
+                            continue
+
+                        extravalues[self.bbvar_map[field]] = value
+
+            if "dependencies" in extravalues:
+                lines_after.append("include ${BPN}-crates.inc")
+                extravalues.pop("dependencies")
+            classes.append("cargo")
+            classes.append("cargo-update-recipe-crates")
+            handled.append("buildsystem")
+        except Exception:
+            logger.exception(
+                "Failed to correctly handle Cargo.toml, falling back to another method"
+            )
+            return False
+
+
+def register_recipe_handlers(handlers):
+    # We need to make sure these are ahead of the makefile fallback handler
+    handlers.append((CargoRecipeHandler(), 80))