fix(add): Limit 'Features as of vX.Y.Z' to when relevant

This will only show the messaeg if we didn't already show a version req
with full precision specified ... mostly.  We'll also skip it if its a
local or git dependency but we never show the version in those cases
because it doesn't matter.

The `precise_version` logic came from cargo-upgrade.

src/cargo/ops/cargo_add/mod.rs

@@ -769,7 +769,16 @@ fn print_msg(shell: &mut Shell, dep: &DependencyEx, section: &[String]) -> Cargo
     if !activated.is_empty() || !deactivated.is_empty() {
         let prefix = format!("{:>13}", " ");
         let suffix = if let Some(version) = &dep.available_version {
-            format!(" as of v{}", version)
+            let version = version.to_string();
+            let version_req = dep
+                .version()
+                .and_then(|v| semver::VersionReq::parse(v).ok())
+                .and_then(|v| precise_version(&v));
+            if version_req.as_deref() != Some(version.as_str()) {
+                format!(" as of v{}", version)
+            } else {
+                "".to_owned()
+            }
         } else {
             "".to_owned()
         };
@@ -832,3 +841,35 @@ fn find_workspace_dep(toml_key: &str, root_manifest: &Path) -> CargoResult<Depen
     ))?;
     Dependency::from_toml(root_manifest.parent().unwrap(), toml_key, dep_item)
 }
+
+fn precise_version(version_req: &semver::VersionReq) -> Option<String> {
+    version_req
+        .comparators
+        .iter()
+        .filter(|c| {
+            matches!(
+                c.op,
+                // Only ops we can determine a precise version from
+                semver::Op::Exact
+                    | semver::Op::GreaterEq
+                    | semver::Op::LessEq
+                    | semver::Op::Tilde
+                    | semver::Op::Caret
+                    | semver::Op::Wildcard
+            )
+        })
+        .filter_map(|c| {
+            // Only do it when full precision is specified
+            c.minor.and_then(|minor| {
+                c.patch.map(|patch| semver::Version {
+                    major: c.major,
+                    minor,
+                    patch,
+                    pre: c.pre.clone(),
+                    build: Default::default(),
+                })
+            })
+        })
+        .max()
+        .map(|v| v.to_string())
+}

tests/testsuite/cargo_add/add_normalized_name_external/stderr.log

@@ -2,7 +2,7 @@
 warning: translating `linked_hash_map` to `linked-hash-map`
 warning: translating `Inflector` to `inflector`
       Adding linked-hash-map v0.5.4 to dependencies.
-             Features as of v0.5.4:
+             Features:
              - clippy
              - heapsize
              - heapsize_impl
@@ -11,7 +11,7 @@ warning: translating `Inflector` to `inflector`
              - serde_impl
              - serde_test
       Adding inflector v0.11.4 to dependencies.
-             Features as of v0.11.4:
+             Features:
              + heavyweight
              + lazy_static
              + regex

tests/testsuite/cargo_add/build_prefer_existing_version/stderr.log

@@ -1,4 +1,4 @@
       Adding cargo-list-test-fixture-dependency (local) to build-dependencies.
-             Features as of v0.0.0:
+             Features:
              - one
              - two

tests/testsuite/cargo_add/list_features_path/stderr.log

@@ -1,5 +1,5 @@
       Adding your-face (local) to dependencies.
-             Features as of v0.1.3:
+             Features:
              + mouth
              + nose
              - eyes

tests/testsuite/cargo_add/list_features_path_no_default/stderr.log

@@ -1,5 +1,5 @@
       Adding your-face (local) to dependencies.
-             Features as of v0.1.3:
+             Features:
              - eyes
              - mouth
              - nose

tests/testsuite/cargo_add/overwrite_name_dev_noop/stderr.log

@@ -1,4 +1,4 @@
       Adding your-face (local) to dev-dependencies.
-             Features as of v0.0.0:
+             Features:
              + mouth
              + nose

tests/testsuite/cargo_add/overwrite_name_noop/stderr.log

@@ -1,4 +1,4 @@
       Adding your-face (local) to optional dependencies.
-             Features as of v0.0.0:
+             Features:
              + mouth
              + nose

tests/testsuite/cargo_add/overwrite_path_noop/stderr.log

@@ -1,4 +1,4 @@
       Adding your-face (local) to optional dependencies.
-             Features as of v0.0.0:
+             Features:
              + mouth
              + nose

tests/testsuite/cargo_add/overwrite_workspace_dep_features/stderr.log

@@ -1,5 +1,5 @@
       Adding foo (local) to dependencies.
-             Features as of v0.0.0:
+             Features:
              + default-base
              + default-merge-base
              + default-test-base