src/main.rs

   1 // error-pattern:yummy
   2 #![feature(box_syntax)]
   3 #![feature(rustc_private)]
   4
   5 #![allow(unknown_lints, missing_docs_in_private_items)]
   6
   7 extern crate clippy_lints;
   8 extern crate getopts;
   9 extern crate rustc;
  10 extern crate rustc_driver;
  11 extern crate rustc_errors;
  12 extern crate rustc_plugin;
  13 extern crate syntax;
  14
  15 use rustc_driver::{driver, CompilerCalls, RustcDefaultCalls, Compilation};
  16 use rustc::session::{config, Session, CompileIncomplete};
  17 use rustc::session::config::{Input, ErrorOutputType};
  18 use std::collections::HashMap;
  19 use std::path::PathBuf;
  20 use std::process::{self, Command};
  21 use syntax::ast;
  22 use std::io::{self, Write};
  23
  24 extern crate cargo_metadata;
  25
  26 struct ClippyCompilerCalls {
  27     default: RustcDefaultCalls,
  28     run_lints: bool,
  29 }
  30
  31 impl ClippyCompilerCalls {
  32     fn new(run_lints: bool) -> Self {
  33         ClippyCompilerCalls {
  34             default: RustcDefaultCalls,
  35             run_lints: run_lints,
  36         }
  37     }
  38 }
  39
  40 impl<'a> CompilerCalls<'a> for ClippyCompilerCalls {
  41     fn early_callback(
  42         &mut self,
  43         matches: &getopts::Matches,
  44         sopts: &config::Options,
  45         cfg: &ast::CrateConfig,
  46         descriptions: &rustc_errors::registry::Registry,
  47         output: ErrorOutputType,
  48     ) -> Compilation {
  49         self.default
  50             .early_callback(matches, sopts, cfg, descriptions, output)
  51     }
  52     fn no_input(
  53         &mut self,
  54         matches: &getopts::Matches,
  55         sopts: &config::Options,
  56         cfg: &ast::CrateConfig,
  57         odir: &Option<PathBuf>,
  58         ofile: &Option<PathBuf>,
  59         descriptions: &rustc_errors::registry::Registry,
  60     ) -> Option<(Input, Option<PathBuf>)> {
  61         self.default
  62             .no_input(matches, sopts, cfg, odir, ofile, descriptions)
  63     }
  64     fn late_callback(
  65         &mut self,
  66         matches: &getopts::Matches,
  67         sess: &Session,
  68         input: &Input,
  69         odir: &Option<PathBuf>,
  70         ofile: &Option<PathBuf>,
  71     ) -> Compilation {
  72         self.default
  73             .late_callback(matches, sess, input, odir, ofile)
  74     }
  75     fn build_controller(&mut self, sess: &Session, matches: &getopts::Matches) -> driver::CompileController<'a> {
  76         let mut control = self.default.build_controller(sess, matches);
  77
  78         if self.run_lints {
  79             let old = std::mem::replace(&mut control.after_parse.callback, box |_| {});
  80             control.after_parse.callback = Box::new(move |state| {
  81                 {
  82                     let mut registry = rustc_plugin::registry::Registry::new(state.session,
  83                                                                              state
  84                                                                                  .krate
  85                                                                                  .as_ref()
  86                                                                                  .expect("at this compilation stage \
  87                                                                                           the krate must be parsed")
  88                                                                                  .span);
  89                     registry.args_hidden = Some(Vec::new());
  90                     clippy_lints::register_plugins(&mut registry);
  91
  92                     let rustc_plugin::registry::Registry {
  93                         early_lint_passes,
  94                         late_lint_passes,
  95                         lint_groups,
  96                         llvm_passes,
  97                         attributes,
  98                         ..
  99                     } = registry;
 100                     let sess = &state.session;
 101                     let mut ls = sess.lint_store.borrow_mut();
 102                     for pass in early_lint_passes {
 103                         ls.register_early_pass(Some(sess), true, pass);
 104                     }
 105                     for pass in late_lint_passes {
 106                         ls.register_late_pass(Some(sess), true, pass);
 107                     }
 108
 109                     for (name, to) in lint_groups {
 110                         ls.register_group(Some(sess), true, name, to);
 111                     }
 112
 113                     sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
 114                     sess.plugin_attributes.borrow_mut().extend(attributes);
 115                 }
 116                 old(state);
 117             });
 118         }
 119
 120         control
 121     }
 122 }
 123
 124 use std::path::Path;
 125
 126 const CARGO_CLIPPY_HELP: &str = r#"Checks a package to catch common mistakes and improve your Rust code.
 127
 128 Usage:
 129     cargo clippy [options] [--] [<opts>...]
 130
 131 Common options:
 132     -h, --help               Print this message
 133     --features               Features to compile for the package
 134     -V, --version            Print version info and exit
 135
 136 Other options are the same as `cargo rustc`.
 137
 138 To allow or deny a lint from the command line you can use `cargo clippy --`
 139 with:
 140
 141     -W --warn OPT       Set lint warnings
 142     -A --allow OPT      Set lint allowed
 143     -D --deny OPT       Set lint denied
 144     -F --forbid OPT     Set lint forbidden
 145
 146 The feature `cargo-clippy` is automatically defined for convenience. You can use
 147 it to allow or deny lints from the code, eg.:
 148
 149     #[cfg_attr(feature = "cargo-clippy", allow(needless_lifetimes))]
 150 "#;
 151
 152 #[allow(print_stdout)]
 153 fn show_help() {
 154     println!("{}", CARGO_CLIPPY_HELP);
 155 }
 156
 157 #[allow(print_stdout)]
 158 fn show_version() {
 159     println!("{}", env!("CARGO_PKG_VERSION"));
 160 }
 161
 162 pub fn main() {
 163     use std::env;
 164
 165     if env::var("CLIPPY_DOGFOOD").map(|_| true).unwrap_or(false) {
 166         panic!("yummy");
 167     }
 168
 169     // Check for version and help flags even when invoked as 'cargo-clippy'
 170     if std::env::args().any(|a| a == "--help" || a == "-h") {
 171         show_help();
 172         return;
 173     }
 174     if std::env::args().any(|a| a == "--version" || a == "-V") {
 175         show_version();
 176         return;
 177     }
 178
 179     if let Some("clippy") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
 180         // this arm is executed on the initial call to `cargo clippy`
 181
 182         let manifest_path_arg = std::env::args()
 183             .skip(2)
 184             .find(|val| val.starts_with("--manifest-path="));
 185
 186         let mut metadata =
 187             if let Ok(metadata) = cargo_metadata::metadata(manifest_path_arg.as_ref().map(AsRef::as_ref)) {
 188                 metadata
 189             } else {
 190                 let _ = io::stderr().write_fmt(format_args!("error: Could not obtain cargo metadata.\n"));
 191                 process::exit(101);
 192             };
 193
 194         let manifest_path = manifest_path_arg.map(|arg| PathBuf::from(Path::new(&arg["--manifest-path=".len()..])));
 195
 196         let package_index = {
 197                 if let Some(ref manifest_path) = manifest_path {
 198                     metadata.packages.iter().position(|package| {
 199                         let package_manifest_path = Path::new(&package.manifest_path);
 200                         package_manifest_path == manifest_path
 201                     })
 202                 } else {
 203                     let package_manifest_paths: HashMap<_, _> =
 204                         metadata.packages.iter()
 205                         .enumerate()
 206                         .map(|(i, package)| {
 207                             let package_manifest_path = Path::new(&package.manifest_path)
 208                                 .parent()
 209                                 .expect("could not find parent directory of package manifest")
 210                                 .canonicalize()
 211                                 .expect("package directory cannot be canonicalized");
 212                             (package_manifest_path, i)
 213                         })
 214                         .collect();
 215
 216                     let current_dir = std::env::current_dir()
 217                         .expect("could not read current directory")
 218                         .canonicalize()
 219                         .expect("current directory cannot be canonicalized");
 220
 221                     let mut current_path: &Path = &current_dir;
 222
 223                     // This gets the most-recent parent (the one that takes the fewest `cd ..`s to
 224                     // reach).
 225                     loop {
 226                         if let Some(&package_index) = package_manifest_paths.get(current_path) {
 227                             break Some(package_index);
 228                         }
 229                         else {
 230                             // We'll never reach the filesystem root, because to get to this point in the code
 231                             // the call to `cargo_metadata::metadata` must have succeeded. So it's okay to
 232                             // unwrap the current path's parent.
 233                             current_path = current_path
 234                                 .parent()
 235                                 .unwrap_or_else(|| panic!("could not find parent of path {}", current_path.display()));
 236                         }
 237                     }
 238                 }
 239             }
 240             .expect("could not find matching package");
 241
 242         let package = metadata.packages.remove(package_index);
 243         for target in package.targets {
 244             let args = std::env::args().skip(2);
 245             if let Some(first) = target.kind.get(0) {
 246                 if target.kind.len() > 1 || first.ends_with("lib") {
 247                     if let Err(code) = process(std::iter::once("--lib".to_owned()).chain(args)) {
 248                         std::process::exit(code);
 249                     }
 250                 } else if ["bin", "example", "test", "bench"].contains(&&**first) {
 251                     if let Err(code) = process(vec![format!("--{}", first), target.name]
 252                                                    .into_iter()
 253                                                    .chain(args)) {
 254                         std::process::exit(code);
 255                     }
 256                 }
 257             } else {
 258                 panic!("badly formatted cargo metadata: target::kind is an empty array");
 259             }
 260         }
 261     } else {
 262         // this arm is executed when cargo-clippy runs `cargo rustc` with the `RUSTC`
 263         // env var set to itself
 264
 265         let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
 266         let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
 267         let sys_root = if let (Some(home), Some(toolchain)) = (home, toolchain) {
 268             format!("{}/toolchains/{}", home, toolchain)
 269         } else {
 270             option_env!("SYSROOT")
 271                 .map(|s| s.to_owned())
 272                 .or_else(|| {
 273                     Command::new("rustc")
 274                         .arg("--print")
 275                         .arg("sysroot")
 276                         .output()
 277                         .ok()
 278                         .and_then(|out| String::from_utf8(out.stdout).ok())
 279                         .map(|s| s.trim().to_owned())
 280                 })
 281                 .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust")
 282         };
 283
 284         rustc_driver::in_rustc_thread(|| {
 285             // this conditional check for the --sysroot flag is there so users can call
 286             // `cargo-clippy` directly
 287             // without having to pass --sysroot or anything
 288             let mut args: Vec<String> = if env::args().any(|s| s == "--sysroot") {
 289                 env::args().collect()
 290             } else {
 291                 env::args()
 292                     .chain(Some("--sysroot".to_owned()))
 293                     .chain(Some(sys_root))
 294                     .collect()
 295             };
 296
 297             // this check ensures that dependencies are built but not linted and the final
 298             // crate is
 299             // linted but not built
 300             let clippy_enabled = env::args().any(|s| s == "--emit=metadata");
 301
 302             if clippy_enabled {
 303                 args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
 304             }
 305
 306             let mut ccc = ClippyCompilerCalls::new(clippy_enabled);
 307             let (result, _) = rustc_driver::run_compiler(&args, &mut ccc, None, None);
 308             if let Err(CompileIncomplete::Errored(_)) = result {
 309                 std::process::exit(1);
 310             }
 311         })
 312                 .expect("rustc_thread failed");
 313     }
 314 }
 315
 316 fn process<I>(old_args: I) -> Result<(), i32>
 317     where I: Iterator<Item = String>
 318 {
 319
 320     let mut args = vec!["rustc".to_owned()];
 321
 322     let mut found_dashes = false;
 323     for arg in old_args {
 324         found_dashes |= arg == "--";
 325         args.push(arg);
 326     }
 327     if !found_dashes {
 328         args.push("--".to_owned());
 329     }
 330     args.push("--emit=metadata".to_owned());
 331     args.push("--cfg".to_owned());
 332     args.push(r#"feature="cargo-clippy""#.to_owned());
 333
 334     let path = std::env::current_exe().expect("current executable path invalid");
 335     let exit_status = std::process::Command::new("cargo")
 336         .args(&args)
 337         .env("RUSTC", path)
 338         .spawn()
 339         .expect("could not run cargo")
 340         .wait()
 341         .expect("failed to wait for cargo?");
 342
 343     if exit_status.success() {
 344         Ok(())
 345     } else {
 346         Err(exit_status.code().unwrap_or(-1))
 347     }
 348 }