feat: suggest similarly named features

src/cargo/ops/cargo_add/mod.rs

@@ -29,6 +29,7 @@ use crate::core::Summary;
 use crate::core::Workspace;
 use crate::sources::source::QueryKind;
 use crate::util::cache_lock::CacheLockMode;
+use crate::util::edit_distance;
 use crate::util::style;
 use crate::util::toml::lookup_path_base;
 use crate::util::toml_mut::dependency::Dependency;
@@ -167,7 +168,20 @@ pub fn add(workspace: &Workspace<'_>, options: &AddOptions<'_>) -> CargoResult<(
             if activated.is_empty() && deactivated.is_empty() {
                 write!(message, "\n\nno features available for crate {}", dep.name)?;
             } else {
-                if !deactivated.is_empty() {
+                let mut suggested = false;
+                for unknown_feature in &unknown_features {
+                    let suggestion = edit_distance::closest_msg(
+                        unknown_feature,
+                        deactivated.iter().chain(activated.iter()),
+                        |dep| *dep,
+                        "feature",
+                    );
+                    if !suggestion.is_empty() {
+                        write!(message, "{suggestion}")?;
+                        suggested = true;
+                    }
+                }
+                if !deactivated.is_empty() && !suggested {
                     if deactivated.len() <= MAX_FEATURE_PRINTS {
                         write!(
                             message,
@@ -191,7 +205,7 @@ pub fn add(workspace: &Workspace<'_>, options: &AddOptions<'_>) -> CargoResult<(
                         )?;
                     }
                 }
-                if !activated.is_empty() {
+                if !activated.is_empty() && !suggested {
                     if deactivated.len() + activated.len() <= MAX_FEATURE_PRINTS {
                         writeln!(
                             message,

tests/testsuite/cargo_add/feature_suggestion_multiple/stderr.term.svg

@@ -1,4 +1,4 @@
-<svg width="740px" height="146px" xmlns="http://www.w3.org/2000/svg">
+<svg width="740px" height="164px" xmlns="http://www.w3.org/2000/svg">
   <style>
     .fg { fill: #AAAAAA }
     .bg { background: #000000 }
@@ -27,11 +27,13 @@
 </tspan>
     <tspan x="10px" y="82px">
 </tspan>
-    <tspan x="10px" y="100px"><tspan>disabled features:</tspan>
+    <tspan x="10px" y="100px"><tspan>help: a feature with a similar name exists: `bar`</tspan>
 </tspan>
-    <tspan x="10px" y="118px"><tspan>    bar, foo</tspan>
+    <tspan x="10px" y="118px">
 </tspan>
-    <tspan x="10px" y="136px">
+    <tspan x="10px" y="136px"><tspan>help: a feature with a similar name exists: `foo`</tspan>
+</tspan>
+    <tspan x="10px" y="154px">
 </tspan>
   </text>
 

tests/testsuite/cargo_add/feature_suggestion_single/stderr.term.svg

@@ -1,4 +1,4 @@
-<svg width="740px" height="146px" xmlns="http://www.w3.org/2000/svg">
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
   <style>
     .fg { fill: #AAAAAA }
     .bg { background: #000000 }
@@ -27,11 +27,9 @@
 </tspan>
     <tspan x="10px" y="82px">
 </tspan>
-    <tspan x="10px" y="100px"><tspan>disabled features:</tspan>
+    <tspan x="10px" y="100px"><tspan>help: a feature with a similar name exists: `bar`</tspan>
 </tspan>
-    <tspan x="10px" y="118px"><tspan>    bar</tspan>
-</tspan>
-    <tspan x="10px" y="136px">
+    <tspan x="10px" y="118px">
 </tspan>
   </text>
 

tests/testsuite/cargo_add/features_error_activated_over_limit/stderr.term.svg

@@ -1,4 +1,4 @@
-<svg width="740px" height="200px" xmlns="http://www.w3.org/2000/svg">
+<svg width="740px" height="164px" xmlns="http://www.w3.org/2000/svg">
   <style>
     .fg { fill: #AAAAAA }
     .bg { background: #000000 }
@@ -27,17 +27,13 @@
 </tspan>
     <tspan x="10px" y="82px">
 </tspan>
-    <tspan x="10px" y="100px"><tspan>disabled features:</tspan>
+    <tspan x="10px" y="100px"><tspan>help: a feature with a similar name exists: `eyes000`</tspan>
 </tspan>
-    <tspan x="10px" y="118px"><tspan>    eyes040, eyes041, eyes042, eyes043, eyes044, eyes045, eyes046, eyes047, eyes048</tspan>
+    <tspan x="10px" y="118px">
 </tspan>
-    <tspan x="10px" y="136px"><tspan>    eyes049</tspan>
+    <tspan x="10px" y="136px"><tspan>help: a feature with a similar name exists: `eyes001`</tspan>
 </tspan>
     <tspan x="10px" y="154px">
-</tspan>
-    <tspan x="10px" y="172px"><tspan>40 enabled features available</tspan>
-</tspan>
-    <tspan x="10px" y="190px">
 </tspan>
   </text>
 

tests/testsuite/cargo_add/features_error_deactivated_over_limit/stderr.term.svg

@@ -27,11 +27,11 @@
 </tspan>
     <tspan x="10px" y="82px">
 </tspan>
-    <tspan x="10px" y="100px"><tspan>199 disabled features available</tspan>
+    <tspan x="10px" y="100px"><tspan>help: a feature with a similar name exists: `eyes100`</tspan>
 </tspan>
     <tspan x="10px" y="118px">
 </tspan>
-    <tspan x="10px" y="136px"><tspan>1 enabled features available</tspan>
+    <tspan x="10px" y="136px"><tspan>help: a feature with a similar name exists: `eyes101`</tspan>
 </tspan>
     <tspan x="10px" y="154px">
 </tspan>

tests/testsuite/cargo_add/features_unknown/stderr.term.svg

@@ -1,4 +1,4 @@
-<svg width="740px" height="146px" xmlns="http://www.w3.org/2000/svg">
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
   <style>
     .fg { fill: #AAAAAA }
     .bg { background: #000000 }
@@ -27,11 +27,9 @@
 </tspan>
     <tspan x="10px" y="82px">
 </tspan>
-    <tspan x="10px" y="100px"><tspan>disabled features:</tspan>
+    <tspan x="10px" y="100px"><tspan>help: a feature with a similar name exists: `nose`</tspan>
 </tspan>
-    <tspan x="10px" y="118px"><tspan>    ears, eyes, mouth, nose</tspan>
-</tspan>
-    <tspan x="10px" y="136px">
+    <tspan x="10px" y="118px">
 </tspan>
   </text>