Auto merge of #9438 - ehuss:report-subcommand, r=alexcrichton

Add `report` subcommand.

This renames the `cargo describe-future-incompatibilities` subcommand to `cargo report future-incompatibilities`. The intent here is to have a general `report` subcommand that can be used for other reports in the future. This helps avoid the proliferation of top-level subcommands, and to help keep the CLI a little more organized.

src/bin/cargo/commands/mod.rs

@@ -7,7 +7,6 @@ pub fn builtin() -> Vec<App> {
         check::cli(),
         clean::cli(),
         config::cli(),
-        describe_future_incompatibilities::cli(),
         doc::cli(),
         fetch::cli(),
         fix::cli(),
@@ -25,6 +24,7 @@ pub fn builtin() -> Vec<App> {
         pkgid::cli(),
         publish::cli(),
         read_manifest::cli(),
+        report::cli(),
         run::cli(),
         rustc::cli(),
         rustdoc::cli(),
@@ -47,7 +47,6 @@ pub fn builtin_exec(cmd: &str) -> Option<fn(&mut Config, &ArgMatches<'_>) -> Cli
         "check" => check::exec,
         "clean" => clean::exec,
         "config" => config::exec,
-        "describe-future-incompatibilities" => describe_future_incompatibilities::exec,
         "doc" => doc::exec,
         "fetch" => fetch::exec,
         "fix" => fix::exec,
@@ -65,6 +64,7 @@ pub fn builtin_exec(cmd: &str) -> Option<fn(&mut Config, &ArgMatches<'_>) -> Cli
         "pkgid" => pkgid::exec,
         "publish" => publish::exec,
         "read-manifest" => read_manifest::exec,
+        "report" => report::exec,
         "run" => run::exec,
         "rustc" => rustc::exec,
         "rustdoc" => rustdoc::exec,
@@ -87,7 +87,6 @@ pub mod build;
 pub mod check;
 pub mod clean;
 pub mod config;
-pub mod describe_future_incompatibilities;
 pub mod doc;
 pub mod fetch;
 pub mod fix;
@@ -106,6 +105,7 @@ pub mod package;
 pub mod pkgid;
 pub mod publish;
 pub mod read_manifest;
+pub mod report;
 pub mod run;
 pub mod rustc;
 pub mod rustdoc;

src/bin/cargo/commands/describe_future_incompatibilities.rs → src/bin/cargo/commands/report.rs

@@ -5,26 +5,35 @@ use cargo::drop_eprint;
 use std::io::Read;
 
 pub fn cli() -> App {
-    subcommand("describe-future-incompatibilities")
-        .arg(
-            opt(
-                "id",
-                "identifier of the report [generated by a Cargo command invocation",
-            )
-            .value_name("id")
-            .required(true),
+    subcommand("report")
+        .about("Generate and display various kinds of reports")
+        .after_help("Run `cargo help report` for more detailed information.\n")
+        .setting(clap::AppSettings::SubcommandRequiredElseHelp)
+        .subcommand(
+            subcommand("future-incompatibilities")
+                .about("Reports any crates which will eventually stop compiling")
+                .arg(
+                    opt(
+                        "id",
+                        "identifier of the report generated by a Cargo command invocation",
+                    )
+                    .value_name("id")
+                    .required(true),
+                ),
         )
-        .about("Reports any crates which will eventually stop compiling")
 }
 
 pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
     if !config.nightly_features_allowed {
-        return Err(anyhow!(
-            "`cargo describe-future-incompatibilities` can only be used on the nightly channel"
-        )
-        .into());
+        return Err(anyhow!("`cargo report` can only be used on the nightly channel").into());
     }
+    match args.subcommand() {
+        ("future-incompatibilities", Some(args)) => report_future_incompatibilies(config, args),
+        (cmd, _) => panic!("unexpected command `{}`", cmd),
+    }
+}
 
+fn report_future_incompatibilies(config: &Config, args: &ArgMatches<'_>) -> CliResult {
     let ws = args.workspace(config)?;
     let report_file = ws.target_dir().open_ro(
         FUTURE_INCOMPAT_FILE,

src/cargo/core/compiler/job_queue.rs

@@ -887,11 +887,11 @@ impl<'cfg> DrainState<'cfg> {
             if cx.bcx.build_config.future_incompat_report {
                 drop_eprint!(cx.bcx.config, "{}", full_report);
                 drop(cx.bcx.config.shell().note(
-                    &format!("this report can be shown with `cargo describe-future-incompatibilities -Z future-incompat-report --id {}`", id)
+                    &format!("this report can be shown with `cargo report future-incompatibilities -Z future-incompat-report --id {}`", id)
                 ));
             } else {
                 drop(cx.bcx.config.shell().note(
-                    &format!("to see what the problems were, use the option `--future-incompat-report`, or run `cargo describe-future-incompatibilities --id {}`", id)
+                    &format!("to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id {}`", id)
                 ));
             }
         }

tests/testsuite/future_incompat_report.rs

@@ -43,10 +43,8 @@ fn gate_future_incompat_report() {
         .with_status(101)
         .run();
 
-    p.cargo("describe-future-incompatibilities --id foo")
-        .with_stderr_contains(
-            "error: `cargo describe-future-incompatibilities` can only be used on the nightly channel"
-        )
+    p.cargo("report future-incompatibilities --id foo")
+        .with_stderr_contains("error: `cargo report` can only be used on the nightly channel")
         .with_status(101)
         .run();
 }
@@ -134,7 +132,7 @@ fn test_multi_crate() {
             .with_stderr_does_not_contain("[..]triggers[..]")
             .run();
 
-        p.cargo("describe-future-incompatibilities -Z future-incompat-report --id bad-id")
+        p.cargo("report future-incompatibilities -Z future-incompat-report --id bad-id")
             .masquerade_as_nightly_cargo()
             .with_stderr_contains("error: Expected an id of [..]")
             .with_stderr_does_not_contain("[..]triggers[..]")
@@ -157,7 +155,7 @@ fn test_multi_crate() {
         .unwrap();
 
     // Extract the 'id' from the stdout. We are looking
-    // for the id in a line of the form "run `cargo describe-future-incompatibilities --id yZ7S`"
+    // for the id in a line of the form "run `cargo report future-incompatibilities --id yZ7S`"
     // which is generated by Cargo to tell the user what command to run
     // This is just to test that passing the id suppresses the warning mesasge. Any users needing
     // access to the report from a shell script should use the `--future-incompat-report` flag
@@ -172,7 +170,7 @@ fn test_multi_crate() {
     // Strip off the trailing '`' included in the output
     let id: String = id.chars().take_while(|c| *c != '`').collect();
 
-    p.cargo(&format!("describe-future-incompatibilities -Z future-incompat-report --id {}", id))
+    p.cargo(&format!("report future-incompatibilities -Z future-incompat-report --id {}", id))
         .masquerade_as_nightly_cargo()
         .with_stderr_contains("The crate `first-dep v0.0.1` currently triggers the following future incompatibility lints:")
         .with_stderr_contains("The crate `second-dep v0.0.2` currently triggers the following future incompatibility lints:")