Fix #10680, Fix #13702

src/cargo/ops/cargo_add/mod.rs

@@ -361,7 +361,9 @@ fn resolve_dependency(
     };
     selected_dep = populate_dependency(selected_dep, arg);
 
-    let old_dep = get_existing_dependency(manifest, selected_dep.toml_key(), section)?;
+    let lookup = |dep_key: &_| get_existing_dependency(manifest, dep_key, section);
+    let old_dep = fuzzy_lookup(&mut selected_dep, lookup, gctx)?;
+
     let mut dependency = if let Some(mut old_dep) = old_dep.clone() {
         if old_dep.name != selected_dep.name {
             // Assuming most existing keys are not relevant when the package changes
@@ -383,7 +385,8 @@ fn resolve_dependency(
     if dependency.source().is_none() {
         // Checking for a workspace dependency happens first since a member could be specified
         // in the workspace dependencies table as a dependency
-        if let Some(_dep) = find_workspace_dep(dependency.toml_key(), ws.root_manifest()).ok() {
+        let lookup = |toml_key: &_| Ok(find_workspace_dep(toml_key, ws.root_manifest()).ok());
+        if let Some(_dep) = fuzzy_lookup(&mut dependency, lookup, gctx)? {
             dependency = dependency.set_source(WorkspaceSource::new());
         } else if let Some(package) = ws.members().find(|p| p.name().as_str() == dependency.name) {
             // Only special-case workspaces when the user doesn't provide any extra
@@ -449,6 +452,42 @@ fn resolve_dependency(
     Ok(dependency)
 }
 
+fn fuzzy_lookup(
+    dependency: &mut Dependency,
+    lookup: impl Fn(&str) -> CargoResult<Option<Dependency>>,
+    gctx: &GlobalContext,
+) -> CargoResult<Option<Dependency>> {
+    if let Some(rename) = dependency.rename() {
+        // Manually implement `toml_key` to restrict fuzzy lookups to only package names to mirror `PackageRegistry::query()`
+        return lookup(rename);
+    }
+
+    for name_permutation in [
+        dependency.name.clone(),
+        dependency.name.replace('-', "_"),
+        dependency.name.replace('_', "-"),
+    ] {
+        let Some(dep) = lookup(&name_permutation)? else {
+            continue;
+        };
+
+        if dependency.name != name_permutation {
+            // Mirror the fuzzy matching policy of `PackageRegistry::query()`
+            if !matches!(dep.source, Some(Source::Registry(_))) {
+                continue;
+            }
+            gctx.shell().warn(format!(
+                "translating `{}` to `{}`",
+                dependency.name, &name_permutation,
+            ))?;
+            dependency.name = name_permutation;
+        }
+        return Ok(Some(dep));
+    }
+
+    Ok(None)
+}
+
 /// When { workspace = true } you cannot define other keys that configure
 /// the source of the dependency such as `version`, `registry`, `registry-index`,
 /// `path`, `git`, `branch`, `tag`, `rev`, or `package`. You can also not define

tests/testsuite/cargo_add/add_workspace_non_fuzzy/in/Cargo.toml

@@ -0,0 +1,2 @@
+[workspace]
+members = ["primary", "fuzzy_name"]

tests/testsuite/cargo_add/add_workspace_non_fuzzy/in/fuzzy_name/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+name = "fuzzy_name"
+version = "0.0.0"
+edition = "2015"

tests/testsuite/cargo_add/add_workspace_non_fuzzy/in/primary/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "bar"
+version = "0.0.0"
+edition = "2015"
+
+[dependencies]
+fuzzy_name = { path = "../fuzzy_name" }

tests/testsuite/cargo_add/add_workspace_non_fuzzy/mod.rs

@@ -0,0 +1,24 @@
+use cargo_test_support::compare::assert_ui;
+use cargo_test_support::current_dir;
+use cargo_test_support::file;
+use cargo_test_support::prelude::*;
+use cargo_test_support::str;
+use cargo_test_support::Project;
+
+#[cargo_test]
+fn case() {
+    let project = Project::from_template(current_dir!().join("in"));
+    let project_root = project.root();
+    let cwd = &project_root;
+
+    snapbox::cmd::Command::cargo_ui()
+        .arg("add")
+        .args(["fuzzy-name", "-p", "bar"])
+        .current_dir(cwd)
+        .assert()
+        .code(101)
+        .stdout_eq(str![""])
+        .stderr_eq(file!["stderr.term.svg"]);
+
+    assert_ui().subset_matches(current_dir!().join("out"), &project_root);
+}

tests/testsuite/cargo_add/add_workspace_non_fuzzy/out/Cargo.toml

@@ -0,0 +1,2 @@
+[workspace]
+members = ["primary", "fuzzy_name"]

tests/testsuite/cargo_add/add_workspace_non_fuzzy/out/primary/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "bar"
+version = "0.0.0"
+edition = "2015"
+
+[dependencies]
+fuzzy_name = { path = "../fuzzy_name" }

tests/testsuite/cargo_add/detect_workspace_inherit_fuzzy/out/primary/Cargo.toml

@@ -4,4 +4,4 @@ version = "0.0.0"
 edition = "2015"
 
 [dependencies]
-fuzzy_dependency = "1.0.0"
+fuzzy_dependency.workspace = true

tests/testsuite/cargo_add/features_fuzzy/out/Cargo.toml

@@ -6,4 +6,4 @@ version = "0.0.0"
 edition = "2015"
 
 [dependencies]
-your_face = { version = "99999.0.0" }
+your_face = { version = "99999.0.0", features = ["eyes"] }

tests/testsuite/cargo_add/mod.rs

@@ -4,6 +4,7 @@ mod add_no_vendored_package_with_alter_registry;
 mod add_no_vendored_package_with_vendor;
 mod add_normalized_name_external;
 mod add_toolchain;
+mod add_workspace_non_fuzzy;
 mod build;
 mod build_prefer_existing_version;
 mod change_rename_target;