rust-clippy/src/main.rs

// error-pattern:yummy
#![feature(box_syntax)]
#![feature(rustc_private)]
#![allow(unknown_lints, missing_docs_in_private_items)]

extern crate clippy_lints;
extern crate getopts;
extern crate rustc;
extern crate rustc_driver;
extern crate rustc_errors;
extern crate rustc_plugin;
extern crate syntax;

use rustc_driver::{driver, Compilation, CompilerCalls, RustcDefaultCalls};
use rustc::session::{config, CompileIncomplete, Session};
use rustc::session::config::{ErrorOutputType, Input};
use std::collections::HashMap;
use std::path::PathBuf;
use std::process::{self, Command};
use syntax::ast;
use std::io::{self, Write};

extern crate cargo_metadata;

struct ClippyCompilerCalls {
    default: RustcDefaultCalls,
    run_lints: bool,
}

impl ClippyCompilerCalls {
    fn new(run_lints: bool) -> Self {
        ClippyCompilerCalls {
            default: RustcDefaultCalls,
            run_lints: run_lints,
        }
    }
}

impl<'a> CompilerCalls<'a> for ClippyCompilerCalls {
    fn early_callback(
        &mut self,
        matches: &getopts::Matches,
        sopts: &config::Options,
        cfg: &ast::CrateConfig,
        descriptions: &rustc_errors::registry::Registry,
        output: ErrorOutputType,
    ) -> Compilation {
        self.default.early_callback(
            matches,
            sopts,
            cfg,
            descriptions,
            output,
        )
    }
    fn no_input(
        &mut self,
        matches: &getopts::Matches,
        sopts: &config::Options,
        cfg: &ast::CrateConfig,
        odir: &Option<PathBuf>,
        ofile: &Option<PathBuf>,
        descriptions: &rustc_errors::registry::Registry,
    ) -> Option<(Input, Option<PathBuf>)> {
        self.default.no_input(
            matches,
            sopts,
            cfg,
            odir,
            ofile,
            descriptions,
        )
    }
    fn late_callback(
        &mut self,
        matches: &getopts::Matches,
        sess: &Session,
        input: &Input,
        odir: &Option<PathBuf>,
        ofile: &Option<PathBuf>,
    ) -> Compilation {
        self.default.late_callback(
            matches,
            sess,
            input,
            odir,
            ofile,
        )
    }
    fn build_controller(&mut self, sess: &Session, matches: &getopts::Matches) -> driver::CompileController<'a> {
        let mut control = self.default.build_controller(sess, matches);

        if self.run_lints {
            let old = std::mem::replace(&mut control.after_parse.callback, box |_| {});
            control.after_parse.callback = Box::new(move |state| {
                {
                    let mut registry = rustc_plugin::registry::Registry::new(
                        state.session,
                        state
                            .krate
                            .as_ref()
                            .expect(
                                "at this compilation stage \
                                                                                          the krate must be parsed",
                            )
                            .span,
                    );
                    registry.args_hidden = Some(Vec::new());
                    clippy_lints::register_plugins(&mut registry);

                    let rustc_plugin::registry::Registry {
                        early_lint_passes,
                        late_lint_passes,
                        lint_groups,
                        llvm_passes,
                        attributes,
                        ..
                    } = registry;
                    let sess = &state.session;
                    let mut ls = sess.lint_store.borrow_mut();
                    for pass in early_lint_passes {
                        ls.register_early_pass(Some(sess), true, pass);
                    }
                    for pass in late_lint_passes {
                        ls.register_late_pass(Some(sess), true, pass);
                    }

                    for (name, to) in lint_groups {
                        ls.register_group(Some(sess), true, name, to);
                    }

                    sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
                    sess.plugin_attributes.borrow_mut().extend(attributes);
                }
                old(state);
            });
        }

        control
    }
}

use std::path::Path;

const CARGO_CLIPPY_HELP: &str = r#"Checks a package to catch common mistakes and improve your Rust code.

Usage:
    cargo clippy [options] [--] [<opts>...]

Common options:
    -h, --help               Print this message
    --features               Features to compile for the package
    -V, --version            Print version info and exit
    --all                    @@@ something sensible here (copy from cargo-edit?)

Other options are the same as `cargo rustc`.

To allow or deny a lint from the command line you can use `cargo clippy --`
with:

    -W --warn OPT       Set lint warnings
    -A --allow OPT      Set lint allowed
    -D --deny OPT       Set lint denied
    -F --forbid OPT     Set lint forbidden

The feature `cargo-clippy` is automatically defined for convenience. You can use
it to allow or deny lints from the code, eg.:

    #[cfg_attr(feature = "cargo-clippy", allow(needless_lifetimes))]
"#;

#[allow(print_stdout)]
fn show_help() {
    println!("{}", CARGO_CLIPPY_HELP);
}

#[allow(print_stdout)]
fn show_version() {
    println!("{}", env!("CARGO_PKG_VERSION"));
}

pub fn main() {
    use std::env;

    if env::var("CLIPPY_DOGFOOD").map(|_| true).unwrap_or(false) {
        panic!("yummy");
    }

    // Check for version and help flags even when invoked as 'cargo-clippy'
    if std::env::args().any(|a| a == "--help" || a == "-h") {
        show_help();
        return;
    }
    if std::env::args().any(|a| a == "--version" || a == "-V") {
        show_version();
        return;
    }

    if let Some("clippy") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
        // this arm is executed on the initial call to `cargo clippy`

        let manifest_path_arg = std::env::args()
            .skip(2)
            .find(|val| val.starts_with("--manifest-path="));

        let mut metadata =
            if let Ok(metadata) = cargo_metadata::metadata(manifest_path_arg.as_ref().map(AsRef::as_ref)) {
                metadata
            } else {
                let _ = io::stderr().write_fmt(format_args!("error: Could not obtain cargo metadata.\n"));
                process::exit(101);
            };

        let manifest_path = manifest_path_arg.map(|arg| {
            Path::new(&arg["--manifest-path=".len()..])
                .canonicalize()
                .expect("manifest path could not be canonicalized")
        });

        let packages = if std::env::args().any(|a| a == "--all") {
            metadata.packages
        } else {
            let package_index = {
                if let Some(manifest_path) = manifest_path {
                    metadata.packages.iter().position(|package| {
                        let package_manifest_path = Path::new(&package.manifest_path)
                            .canonicalize()
                            .expect("package manifest path could not be canonicalized");
                        package_manifest_path == manifest_path
                    })
                } else {
                    let package_manifest_paths: HashMap<_, _> = metadata
                        .packages
                        .iter()
                        .enumerate()
                        .map(|(i, package)| {
                            let package_manifest_path = Path::new(&package.manifest_path)
                                .parent()
                                .expect("could not find parent directory of package manifest")
                                .canonicalize()
                                .expect("package directory cannot be canonicalized");
                            (package_manifest_path, i)
                        })
                        .collect();

                    let current_dir = std::env::current_dir()
                        .expect("could not read current directory")
                        .canonicalize()
                        .expect("current directory cannot be canonicalized");

                    let mut current_path: &Path = &current_dir;

                    // This gets the most-recent parent (the one that takes the fewest `cd ..`s to
                    // reach).
                    loop {
                        if let Some(&package_index) = package_manifest_paths.get(current_path) {
                            break Some(package_index);
                        } else {
                            // We'll never reach the filesystem root, because to get to this point in the
                            // code
                            // the call to `cargo_metadata::metadata` must have succeeded. So it's okay to
                            // unwrap the current path's parent.
                            current_path = current_path
                                .parent()
                                .unwrap_or_else(|| panic!("could not find parent of path {}", current_path.display()));
                        }
                    }
                }
            }.expect("could not find matching package");

            vec![metadata.packages.remove(package_index)]
        };

        for package in packages {
            let manifest_path = package.manifest_path;

            for target in package.targets {
                let args = std::env::args()
                    .skip(2)
                    .filter(|a| a != "--all" && !a.starts_with("--manifest-path="));

                let args = std::iter::once(format!("--manifest-path={}", manifest_path)).chain(args);
                if let Some(first) = target.kind.get(0) {
                    if target.kind.len() > 1 || first.ends_with("lib") {
                        if let Err(code) = process(std::iter::once("--lib".to_owned()).chain(args)) {
                            std::process::exit(code);
                        }
                    } else if ["bin", "example", "test", "bench"].contains(&&**first) {
                        if let Err(code) = process(
                            vec![format!("--{}", first), target.name]
                                .into_iter()
                                .chain(args),
                        ) {
                            std::process::exit(code);
                        }
                    }
                } else {
                    panic!("badly formatted cargo metadata: target::kind is an empty array");
                }
            }
        }
    } else {
        // this arm is executed when cargo-clippy runs `cargo rustc` with the `RUSTC`
        // env var set to itself

        let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
        let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
        let sys_root = if let (Some(home), Some(toolchain)) = (home, toolchain) {
            format!("{}/toolchains/{}", home, toolchain)
        } else {
            option_env!("SYSROOT")
                .map(|s| s.to_owned())
                .or_else(|| {
                    Command::new("rustc")
                        .arg("--print")
                        .arg("sysroot")
                        .output()
                        .ok()
                        .and_then(|out| String::from_utf8(out.stdout).ok())
                        .map(|s| s.trim().to_owned())
                })
                .expect(
                    "need to specify SYSROOT env var during clippy compilation, or use rustup or multirust",
                )
        };

        rustc_driver::in_rustc_thread(|| {
            // this conditional check for the --sysroot flag is there so users can call
            // `cargo-clippy` directly
            // without having to pass --sysroot or anything
            let mut args: Vec<String> = if env::args().any(|s| s == "--sysroot") {
                env::args().collect()
            } else {
                env::args()
                    .chain(Some("--sysroot".to_owned()))
                    .chain(Some(sys_root))
                    .collect()
            };

            // this check ensures that dependencies are built but not linted and the final
            // crate is
            // linted but not built
            let clippy_enabled = env::args().any(|s| s == "--emit=metadata");

            if clippy_enabled {
                args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
            }

            let mut ccc = ClippyCompilerCalls::new(clippy_enabled);
            let (result, _) = rustc_driver::run_compiler(&args, &mut ccc, None, None);
            if let Err(CompileIncomplete::Errored(_)) = result {
                std::process::exit(1);
            }
        }).expect("rustc_thread failed");
    }
}

fn process<I>(old_args: I) -> Result<(), i32>
where
    I: Iterator<Item = String>,
{

    let mut args = vec!["rustc".to_owned()];

    let mut found_dashes = false;
    for arg in old_args {
        found_dashes |= arg == "--";
        args.push(arg);
    }
    if !found_dashes {
        args.push("--".to_owned());
    }
    args.push("--emit=metadata".to_owned());
    args.push("--cfg".to_owned());
    args.push(r#"feature="cargo-clippy""#.to_owned());

    let path = std::env::current_exe().expect("current executable path invalid");
    let exit_status = std::process::Command::new("cargo")
        .args(&args)
        .env("RUSTC", path)
        .spawn()
        .expect("could not run cargo")
        .wait()
        .expect("failed to wait for cargo?");

    if exit_status.success() {
        Ok(())
    } else {
        Err(exit_status.code().unwrap_or(-1))
    }
}