Make cargo install report needed features

src/cargo/ops/cargo_install.rs

@@ -4,7 +4,7 @@ use std::sync::Arc;
 use std::{env, fs};
 
 use crate::core::compiler::{CompileKind, DefaultExecutor, Executor, UnitOutput};
-use crate::core::{Dependency, Edition, Package, PackageId, Source, SourceId, Workspace};
+use crate::core::{Dependency, Edition, Package, PackageId, Source, SourceId, Target, Workspace};
 use crate::ops::{common_for_install_and_uninstall::*, FilterRule};
 use crate::ops::{CompileFilter, Packages};
 use crate::sources::{GitSource, PathSource, SourceConfigMap};
@@ -14,6 +14,7 @@ use crate::{drop_println, ops};
 
 use anyhow::{bail, format_err, Context as _};
 use cargo_util::paths;
+use itertools::Itertools;
 use semver::VersionReq;
 use tempfile::Builder as TempFileBuilder;
 
@@ -360,10 +361,16 @@ impl<'cfg, 'a> InstallablePackage<'cfg, 'a> {
             //
             // Note that we know at this point that _if_ bins or examples is set to `::Just`,
             // they're `::Just([])`, which is `FilterRule::none()`.
-            if self.pkg.targets().iter().any(|t| t.is_executable()) {
+            let binaries: Vec<_> = self
+                .pkg
+                .targets()
+                .iter()
+                .filter(|t| t.is_executable())
+                .collect();
+            if !binaries.is_empty() {
                 self.config
                     .shell()
-                    .warn("none of the package's binaries are available for install using the selected features")?;
+                    .warn(make_warning_about_missing_features(&binaries))?;
             }
 
             return Ok(false);
@@ -546,6 +553,45 @@ impl<'cfg, 'a> InstallablePackage<'cfg, 'a> {
     }
 }
 
+fn make_warning_about_missing_features(binaries: &[&Target]) -> String {
+    let max_targets_listed = 7;
+    let target_features_message = binaries
+        .iter()
+        .take(max_targets_listed)
+        .map(|b| {
+            let name = b.description_named();
+            let features = b
+                .required_features()
+                .unwrap_or(&Vec::new())
+                .iter()
+                .map(|f| format!("`{f}`"))
+                .join(", ");
+            format!("  {name} requires the features: {features}")
+        })
+        .join("\n");
+
+    let additional_bins_message = if binaries.len() > max_targets_listed {
+        format!(
+            "\n{} more targets also requires features not enabled, see them in the Cargo.toml file.",
+            binaries.len() - max_targets_listed
+        )
+    } else {
+        "".into()
+    };
+
+    let example_features = binaries[0]
+        .required_features()
+        .map(|f| f.join(" "))
+        .unwrap_or_default();
+
+    format!(
+        "\
+none of the package's binaries are available for install using the selected features
+{target_features_message}{additional_bins_message}
+Consider enabling some of the needed features by passing, e.g., `--features=\"{example_features}\"`"
+    )
+}
+
 pub fn install(
     config: &Config,
     root: Option<&str>,

tests/testsuite/required_features.rs

@@ -640,6 +640,9 @@ fn install_default_features() {
 [INSTALLING] foo v0.0.1 ([..])
 [FINISHED] release [optimized] target(s) in [..]
 [WARNING] none of the package's binaries are available for install using the selected features
+  bin \"foo\" requires the features: `a`
+  example \"foo\" requires the features: `a`
+Consider enabling some of the needed features by passing, e.g., `--features=\"a\"`
 ",
         )
         .run();
@@ -792,6 +795,11 @@ fn install_multiple_required_features() {
 [INSTALLING] foo v0.0.1 ([..])
 [FINISHED] release [optimized] target(s) in [..]
 [WARNING] none of the package's binaries are available for install using the selected features
+  bin \"foo_1\" requires the features: `b`, `c`
+  bin \"foo_2\" requires the features: `a`
+  example \"foo_3\" requires the features: `b`, `c`
+  example \"foo_4\" requires the features: `a`
+Consider enabling some of the needed features by passing, e.g., `--features=\"b c\"`
 ",
         )
         .run();
@@ -802,6 +810,11 @@ fn install_multiple_required_features() {
 [WARNING] Target filter `bins` specified, but no targets matched. This is a no-op
 [FINISHED] release [optimized] target(s) in [..]
 [WARNING] none of the package's binaries are available for install using the selected features
+  bin \"foo_1\" requires the features: `b`, `c`
+  bin \"foo_2\" requires the features: `a`
+  example \"foo_3\" requires the features: `b`, `c`
+  example \"foo_4\" requires the features: `a`
+Consider enabling some of the needed features by passing, e.g., `--features=\"b c\"`
 ",
         )
         .run();
@@ -812,6 +825,11 @@ fn install_multiple_required_features() {
 [WARNING] Target filter `examples` specified, but no targets matched. This is a no-op
 [FINISHED] release [optimized] target(s) in [..]
 [WARNING] none of the package's binaries are available for install using the selected features
+  bin \"foo_1\" requires the features: `b`, `c`
+  bin \"foo_2\" requires the features: `a`
+  example \"foo_3\" requires the features: `b`, `c`
+  example \"foo_4\" requires the features: `a`
+Consider enabling some of the needed features by passing, e.g., `--features=\"b c\"`
 ",
         )
         .run();
@@ -822,6 +840,11 @@ fn install_multiple_required_features() {
 [WARNING] Target filters `bins`, `examples` specified, but no targets matched. This is a no-op
 [FINISHED] release [optimized] target(s) in [..]
 [WARNING] none of the package's binaries are available for install using the selected features
+  bin \"foo_1\" requires the features: `b`, `c`
+  bin \"foo_2\" requires the features: `a`
+  example \"foo_3\" requires the features: `b`, `c`
+  example \"foo_4\" requires the features: `a`
+Consider enabling some of the needed features by passing, e.g., `--features=\"b c\"`
 ",
         )
         .run();
@@ -1080,6 +1103,9 @@ Consider enabling them by passing, e.g., `--features=\"bar/a\"`
 [INSTALLING] foo v0.0.1 ([..])
 [FINISHED] release [optimized] target(s) in [..]
 [WARNING] none of the package's binaries are available for install using the selected features
+  bin \"foo\" requires the features: `bar/a`
+  example \"foo\" requires the features: `bar/a`
+Consider enabling some of the needed features by passing, e.g., `--features=\"bar/a\"`
 ",
         )
         .run();
@@ -1333,3 +1359,94 @@ Consider enabling them by passing, e.g., `--features=\"a1/f1\"`
         .with_stdout("a1 f1\na2 f2")
         .run();
 }
+
+#[cargo_test]
+fn truncated_install_warning_message() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+    [package]
+    name = "foo"
+    version = "0.1.0"
+    edition = "2021"
+
+    [features]
+    feature1 = []
+    feature2 = []
+    feature3 = []
+    feature4 = []
+    feature5 = []
+
+    [[bin]]
+    name = "foo1"
+    required-features = ["feature1", "feature2", "feature3"]
+
+    [[bin]]
+    name = "foo2"
+    required-features = ["feature2"]
+
+    [[bin]]
+    name = "foo3"
+    required-features = ["feature3"]
+
+    [[bin]]
+    name = "foo4"
+    required-features = ["feature4", "feature1"]
+
+    [[bin]]
+    name = "foo5"
+    required-features = ["feature1", "feature2", "feature3", "feature4", "feature5"]
+
+    [[bin]]
+    name = "foo6"
+    required-features = ["feature1", "feature2", "feature3", "feature4", "feature5"]
+
+    [[bin]]
+    name = "foo7"
+    required-features = ["feature1", "feature2", "feature3", "feature4", "feature5"]
+
+    [[bin]]
+    name = "foo8"
+    required-features = ["feature1", "feature2", "feature3", "feature4", "feature5"]
+
+    [[bin]]
+    name = "foo9"
+    required-features = ["feature1", "feature2", "feature3", "feature4", "feature5"]
+
+    [[bin]]
+    name = "foo10"
+    required-features = ["feature1", "feature2", "feature3", "feature4", "feature5"]
+
+    [[example]]
+    name = "example1"
+    required-features = ["feature1", "feature2"]
+    "#,
+        )
+        .file("src/bin/foo1.rs", "fn main() {}")
+        .file("src/bin/foo2.rs", "fn main() {}")
+        .file("src/bin/foo3.rs", "fn main() {}")
+        .file("src/bin/foo4.rs", "fn main() {}")
+        .file("src/bin/foo5.rs", "fn main() {}")
+        .file("src/bin/foo6.rs", "fn main() {}")
+        .file("src/bin/foo7.rs", "fn main() {}")
+        .file("src/bin/foo8.rs", "fn main() {}")
+        .file("src/bin/foo9.rs", "fn main() {}")
+        .file("src/bin/foo10.rs", "fn main() {}")
+        .file("examples/example1.rs", "fn main() {}")
+        .build();
+
+    p.cargo("install --path .").with_stderr("\
+[INSTALLING] foo v0.1.0 ([..])
+[FINISHED] release [optimized] target(s) in [..]
+[WARNING] none of the package's binaries are available for install using the selected features
+  bin \"foo1\" requires the features: `feature1`, `feature2`, `feature3`
+  bin \"foo2\" requires the features: `feature2`
+  bin \"foo3\" requires the features: `feature3`
+  bin \"foo4\" requires the features: `feature4`, `feature1`
+  bin \"foo5\" requires the features: `feature1`, `feature2`, `feature3`, `feature4`, `feature5`
+  bin \"foo6\" requires the features: `feature1`, `feature2`, `feature3`, `feature4`, `feature5`
+  bin \"foo7\" requires the features: `feature1`, `feature2`, `feature3`, `feature4`, `feature5`
+4 more targets also requires features not enabled. See them in the Cargo.toml file.
+Consider enabling some of the needed features by passing, e.g., `--features=\"feature1 feature2 feature3\"`").run();
+}