Support workspace inheritance (#104)

src/dependencies.rs

@@ -35,6 +35,7 @@ pub(crate) fn try_get_workspace_manifest(manifest_dir: &Path) -> Result<Workspac
     let manifest_str = fs::read_to_string(cargo_toml_path)?;
     let mut manifest: WorkspaceManifest = basic_toml::from_str(&manifest_str)?;
 
+    fix_dependencies(&mut manifest.workspace.dependencies, manifest_dir);
     fix_patches(&mut manifest.patch, manifest_dir);
     fix_replacements(&mut manifest.replace, manifest_dir);
 
@@ -66,12 +67,27 @@ fn fix_replacements(replacements: &mut Map<String, Patch>, dir: &Path) {
 
 #[derive(Deserialize, Default, Debug)]
 pub struct WorkspaceManifest {
+    #[serde(default)]
+    pub workspace: Workspace,
     #[serde(default)]
     pub patch: Map<String, RegistryPatch>,
     #[serde(default)]
     pub replace: Map<String, Patch>,
 }
 
+#[derive(Deserialize, Default, Debug)]
+pub struct Workspace {
+    #[serde(default)]
+    pub package: WorkspacePackage,
+    #[serde(default)]
+    pub dependencies: Map<String, Dependency>,
+}
+
+#[derive(Deserialize, Default, Debug)]
+pub struct WorkspacePackage {
+    pub edition: Option<String>,
+}
+
 #[derive(Deserialize, Default, Debug)]
 pub struct Manifest {
     #[serde(default, rename = "cargo-features")]
@@ -107,6 +123,8 @@ pub struct Dependency {
     pub default_features: bool,
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
     pub features: Vec<String>,
+    #[serde(default, skip_serializing_if = "is_false")]
+    pub workspace: bool,
     #[serde(flatten)]
     pub rest: Map<String, Value>,
 }
@@ -136,6 +154,11 @@ fn is_true(boolean: &bool) -> bool {
     *boolean
 }
 
+#[allow(clippy::trivially_copy_pass_by_ref)]
+fn is_false(boolean: &bool) -> bool {
+    !*boolean
+}
+
 impl Serialize for Dependency {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where
@@ -171,6 +194,7 @@ impl<'de> Deserialize<'de> for Dependency {
                     path: None,
                     default_features: true,
                     features: Vec::new(),
+                    workspace: false,
                     rest: Map::new(),
                 })
             }

src/expand.rs

@@ -268,7 +268,12 @@ fn make_manifest(
         features,
         dependencies: std::collections::BTreeMap::new(),
         bins: Vec::new(),
-        workspace: Some(Workspace {}),
+        workspace: Some(Workspace {
+            package: crate::manifest::WorkspacePackage {
+                edition: workspace_manifest.workspace.package.edition,
+            },
+            dependencies: workspace_manifest.workspace.dependencies,
+        }),
         // Within a workspace, only the [patch] and [replace] sections in
         // the workspace root's Cargo.toml are applied by Cargo.
         patch: workspace_manifest.patch,
@@ -286,6 +291,7 @@ fn make_manifest(
             path: Some(project.source_dir.clone()),
             default_features: false,
             features: Vec::new(),
+            workspace: false,
             rest: std::collections::BTreeMap::new(),
         },
     );

src/manifest.rs

@@ -1,5 +1,6 @@
 use crate::dependencies::{Dependency, Patch, RegistryPatch};
 use serde_derive::{Deserialize, Serialize};
+use serde_json::Value;
 use std::collections::BTreeMap as Map;
 use std::ffi::OsStr;
 use std::path::PathBuf;
@@ -27,13 +28,13 @@ pub struct Manifest {
 pub struct Package {
     pub name: String,
     pub version: String,
-    pub edition: Edition,
     pub publish: bool,
+    pub edition: Edition,
 }
 
 // Do not use enum for edition for future-compatibility.
 #[derive(Serialize, Deserialize, Debug)]
-pub struct Edition(pub String);
+pub struct Edition(pub Value);
 
 #[derive(Serialize, Debug)]
 pub struct Bin {
@@ -55,7 +56,24 @@ pub struct Build {
 }
 
 #[derive(Serialize, Debug)]
-pub struct Workspace {}
+pub struct Workspace {
+    #[serde(skip_serializing_if = "WorkspacePackage::is_none")]
+    pub package: WorkspacePackage,
+    #[serde(skip_serializing_if = "Map::is_empty")]
+    pub dependencies: Map<String, Dependency>,
+}
+
+#[derive(Serialize, Debug)]
+pub struct WorkspacePackage {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub edition: Option<String>,
+}
+
+impl WorkspacePackage {
+    fn is_none(&self) -> bool {
+        self.edition.is_none()
+    }
+}
 
 impl Default for Edition {
     fn default() -> Self {