Simplify xtask

lib/bin/test separation isn't really needed.

xtask/src/main.rs

@@ -7,22 +7,35 @@
 //!
 //! This binary is integrated into the `cargo` command line by using an alias in
 //! `.cargo/config`.
+mod codegen;
+mod ast_src;
+#[cfg(test)]
+mod tidy;
 
-use std::env;
+mod install;
+mod release;
+mod dist;
+mod pre_commit;
+mod metrics;
+mod pre_cache;
 
-use anyhow::bail;
+use anyhow::{bail, Result};
 use codegen::CodegenCmd;
 use pico_args::Arguments;
-use xshell::{cmd, cp, pushd};
-use xtask::{
-    codegen::{self, Mode},
+use std::{
+    env,
+    path::{Path, PathBuf},
+};
+use walkdir::{DirEntry, WalkDir};
+use xshell::{cmd, cp, pushd, pushenv};
+
+use crate::{
+    codegen::Mode,
     dist::DistCmd,
     install::{InstallCmd, Malloc, ServerOpt},
     metrics::MetricsCmd,
     pre_cache::PreCacheCmd,
-    pre_commit, project_root,
     release::{PromoteCmd, ReleaseCmd},
-    run_clippy, run_fuzzer, run_rustfmt, Result,
 };
 
 fn main() -> Result<()> {
@@ -172,3 +185,110 @@ fn finish_args(args: Arguments) -> Result<()> {
     }
     Ok(())
 }
+
+fn project_root() -> PathBuf {
+    Path::new(
+        &env::var("CARGO_MANIFEST_DIR").unwrap_or_else(|_| env!("CARGO_MANIFEST_DIR").to_owned()),
+    )
+    .ancestors()
+    .nth(1)
+    .unwrap()
+    .to_path_buf()
+}
+
+fn rust_files() -> impl Iterator<Item = PathBuf> {
+    rust_files_in(&project_root().join("crates"))
+}
+
+#[cfg(test)]
+fn cargo_files() -> impl Iterator<Item = PathBuf> {
+    files_in(&project_root(), "toml")
+        .filter(|path| path.file_name().map(|it| it == "Cargo.toml").unwrap_or(false))
+}
+
+fn rust_files_in(path: &Path) -> impl Iterator<Item = PathBuf> {
+    files_in(path, "rs")
+}
+
+fn run_rustfmt(mode: Mode) -> Result<()> {
+    let _dir = pushd(project_root())?;
+    let _e = pushenv("RUSTUP_TOOLCHAIN", "stable");
+    ensure_rustfmt()?;
+    let check = match mode {
+        Mode::Overwrite => &[][..],
+        Mode::Verify => &["--", "--check"],
+    };
+    cmd!("cargo fmt {check...}").run()?;
+    Ok(())
+}
+
+fn ensure_rustfmt() -> Result<()> {
+    let out = cmd!("rustfmt --version").read()?;
+    if !out.contains("stable") {
+        bail!(
+            "Failed to run rustfmt from toolchain 'stable'. \
+             Please run `rustup component add rustfmt --toolchain stable` to install it.",
+        )
+    }
+    Ok(())
+}
+
+fn run_clippy() -> Result<()> {
+    if cmd!("cargo clippy --version").read().is_err() {
+        bail!(
+            "Failed run cargo clippy. \
+            Please run `rustup component add clippy` to install it.",
+        )
+    }
+
+    let allowed_lints = "
+        -A clippy::collapsible_if
+        -A clippy::needless_pass_by_value
+        -A clippy::nonminimal_bool
+        -A clippy::redundant_pattern_matching
+    "
+    .split_ascii_whitespace();
+    cmd!("cargo clippy --all-features --all-targets -- {allowed_lints...}").run()?;
+    Ok(())
+}
+
+fn run_fuzzer() -> Result<()> {
+    let _d = pushd("./crates/syntax")?;
+    let _e = pushenv("RUSTUP_TOOLCHAIN", "nightly");
+    if cmd!("cargo fuzz --help").read().is_err() {
+        cmd!("cargo install cargo-fuzz").run()?;
+    };
+
+    // Expecting nightly rustc
+    let out = cmd!("rustc --version").read()?;
+    if !out.contains("nightly") {
+        bail!("fuzz tests require nightly rustc")
+    }
+
+    cmd!("cargo fuzz run parser").run()?;
+    Ok(())
+}
+
+fn date_iso() -> Result<String> {
+    let res = cmd!("date --iso --utc").read()?;
+    Ok(res)
+}
+
+fn is_release_tag(tag: &str) -> bool {
+    tag.len() == "2020-02-24".len() && tag.starts_with(|c: char| c.is_ascii_digit())
+}
+
+fn files_in(path: &Path, ext: &'static str) -> impl Iterator<Item = PathBuf> {
+    let iter = WalkDir::new(path);
+    return iter
+        .into_iter()
+        .filter_entry(|e| !is_hidden(e))
+        .map(|e| e.unwrap())
+        .filter(|e| !e.file_type().is_dir())
+        .map(|e| e.into_path())
+        .filter(move |path| path.extension().map(|it| it == ext).unwrap_or(false));
+
+    fn is_hidden(entry: &DirEntry) -> bool {
+        entry.file_name().to_str().map(|s| s.starts_with('.')).unwrap_or(false)
+    }
+}