From a181fd318b12d0648d126b81ed031d074c8471cf Mon Sep 17 00:00:00 2001
From: Alan Du <alanhdu@gmail.com>
Date: Mon, 3 Jun 2019 09:43:06 -0400
Subject: Implement cargo lint to run clippy

---
 .cargo/config            |  3 +++
 crates/tools/src/lib.rs  | 28 ++++++++++++++++++++++++++++
 crates/tools/src/main.rs |  4 +++-
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/.cargo/config b/.cargo/config
index b12f407e6..51ae33910 100644
--- a/.cargo/config
+++ b/.cargo/config
@@ -12,6 +12,9 @@ install-code = "run --package tools --bin tools -- install-code"
 # Formats the full repository or installs the git hook to do it automatically.
 format       = "run --package tools --bin tools -- format"
 format-hook  = "run --package tools --bin tools -- format-hook"
+# Run clippy
+lint         = "run --package tools --bin tools -- lint"
+
 # Runs the fuzzing test suite (currently only parser)
 fuzz-tests   = "run --package tools --bin tools -- fuzz-tests"
 
diff --git a/crates/tools/src/lib.rs b/crates/tools/src/lib.rs
index 11b52ccb7..92634655d 100644
--- a/crates/tools/src/lib.rs
+++ b/crates/tools/src/lib.rs
@@ -133,6 +133,34 @@ pub fn install_format_hook() -> Result<()> {
     Ok(())
 }
 
+pub fn run_clippy() -> Result<()> {
+    match Command::new("rustup")
+        .args(&["run", TOOLCHAIN, "--", "cargo", "clippy", "--version"])
+        .stderr(Stdio::null())
+        .stdout(Stdio::null())
+        .status()
+    {
+        Ok(status) if status.success() => (),
+        _ => install_clippy()?,
+    };
+
+    let allowed_lints = ["clippy::collapsible_if", "clippy::nonminimal_bool"];
+    run(
+        &format!(
+            "rustup run {} -- cargo clippy --all-features --all-targets -- -A {}",
+            TOOLCHAIN,
+            allowed_lints.join(" -A ")
+        ),
+        ".",
+    )?;
+    Ok(())
+}
+
+pub fn install_clippy() -> Result<()> {
+    run(&format!("rustup install {}", TOOLCHAIN), ".")?;
+    run(&format!("rustup component add clippy --toolchain {}", TOOLCHAIN), ".")
+}
+
 pub fn run_fuzzer() -> Result<()> {
     match Command::new("cargo")
         .args(&["fuzz", "--help"])
diff --git a/crates/tools/src/main.rs b/crates/tools/src/main.rs
index 0c3339685..cf189bf1c 100644
--- a/crates/tools/src/main.rs
+++ b/crates/tools/src/main.rs
@@ -3,7 +3,7 @@ use core::str;
 use failure::bail;
 use tools::{
     generate, gen_tests, install_format_hook, run, run_with_output, run_rustfmt,
-    Overwrite, Result, run_fuzzer,
+    Overwrite, Result, run_fuzzer, run_clippy,
 };
 use std::{path::{PathBuf}, env};
 
@@ -16,6 +16,7 @@ fn main() -> Result<()> {
         .subcommand(SubCommand::with_name("format"))
         .subcommand(SubCommand::with_name("format-hook"))
         .subcommand(SubCommand::with_name("fuzz-tests"))
+        .subcommand(SubCommand::with_name("lint"))
         .get_matches();
     match matches.subcommand_name().expect("Subcommand must be specified") {
         "install-code" => {
@@ -28,6 +29,7 @@ fn main() -> Result<()> {
         "gen-syntax" => generate(Overwrite)?,
         "format" => run_rustfmt(Overwrite)?,
         "format-hook" => install_format_hook()?,
+        "lint" => run_clippy()?,
         "fuzz-tests" => run_fuzzer()?,
         _ => unreachable!(),
     }
-- 
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