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# This script implements the workspace inheritance mechanism described
# here: https://doc.rust-lang.org/cargo/reference/workspaces.html#the-package-table
#
# Please run `mypy --strict`, `black`, and `isort --profile black` on this after editing, thanks!
import sys
from typing import Any
import tomli
import tomli_w
def load_file(path: str) -> dict[str, Any]:
with open(path, "rb") as f:
return tomli.load(f)
# This replicates the dependency merging logic from Cargo.
# See `inner_dependency_inherit_with`:
# https://github.com/rust-lang/cargo/blob/4de0094ac78743d2c8ff682489e35c8a7cafe8e4/src/cargo/util/toml/mod.rs#L982
def replace_key(
workspace_manifest: dict[str, Any], table: dict[str, Any], section: str, key: str
) -> bool:
if (
isinstance(table[key], dict)
and "workspace" in table[key]
and table[key]["workspace"] is True
):
print("replacing " + key)
local_dep = table[key]
del local_dep["workspace"]
workspace_dep = workspace_manifest[section][key]
if section == "dependencies":
if isinstance(workspace_dep, str):
workspace_dep = {"version": workspace_dep}
final: dict[str, Any] = workspace_dep.copy()
merged_features = local_dep.pop("features", []) + workspace_dep.get("features", [])
if merged_features:
final["features"] = merged_features
local_default_features = local_dep.pop("default-features", None)
workspace_default_features = workspace_dep.get("default-features")
if not workspace_default_features and local_default_features:
final["default-features"] = True
optional = local_dep.pop("optional", False)
if optional:
final["optional"] = True
if local_dep:
raise Exception(f"Unhandled keys in inherited dependency {key}: {local_dep}")
table[key] = final
elif section == "package":
table[key] = workspace_dep
return True
return False
def replace_dependencies(
workspace_manifest: dict[str, Any], root: dict[str, Any]
) -> bool:
changed = False
for key in ["dependencies", "dev-dependencies", "build-dependencies"]:
if key in root:
for k in root[key].keys():
changed |= replace_key(workspace_manifest, root[key], "dependencies", k)
return changed
def main() -> None:
top_cargo_toml = load_file(sys.argv[2])
if "workspace" not in top_cargo_toml:
# If top_cargo_toml is not a workspace manifest, then this script was probably
# ran on something that does not actually use workspace dependencies
print(f"{sys.argv[2]} is not a workspace manifest, doing nothing.")
return
crate_manifest = load_file(sys.argv[1])
workspace_manifest = top_cargo_toml["workspace"]
if "workspace" in crate_manifest:
return
changed = False
for key in crate_manifest["package"].keys():
changed |= replace_key(
workspace_manifest, crate_manifest["package"], "package", key
)
changed |= replace_dependencies(workspace_manifest, crate_manifest)
if "target" in crate_manifest:
for key in crate_manifest["target"].keys():
changed |= replace_dependencies(
workspace_manifest, crate_manifest["target"][key]
)
if (
"lints" in crate_manifest
and "workspace" in crate_manifest["lints"]
and crate_manifest["lints"]["workspace"] is True
):
crate_manifest["lints"] = workspace_manifest["lints"]
if not changed:
return
with open(sys.argv[1], "wb") as f:
tomli_w.dump(crate_manifest, f)
if __name__ == "__main__":
main()
|
