17 files changed, 164 insertions, 230 deletions

diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index b379797f9..0455dd2eb 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -6,9 +6,6 @@ authors = ["rust-analyzer developers"]
 publish = false
 license = "MIT OR Apache-2.0"
 
-[lib]
-doctest = false
-
 [dependencies]
 anyhow = "1.0.26"
 flate2 = "1.0"
diff --git a/xtask/src/codegen.rs b/xtask/src/codegen.rs
index adea053b6..743e83e76 100644
--- a/xtask/src/codegen.rs
+++ b/xtask/src/codegen.rs
@@ -20,7 +20,7 @@ use xshell::{cmd, pushenv, read_file, write_file};
 
 use crate::{ensure_rustfmt, project_root, Result};
 
-pub use self::{
+pub(crate) use self::{
     gen_assists_docs::{generate_assists_docs, generate_assists_tests},
     gen_diagnostic_docs::generate_diagnostic_docs,
     gen_feature_docs::generate_feature_docs,
@@ -30,17 +30,17 @@ pub use self::{
 };
 
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
-pub enum Mode {
+pub(crate) enum Mode {
     Overwrite,
     Verify,
 }
 
-pub struct CodegenCmd {
-    pub features: bool,
+pub(crate) struct CodegenCmd {
+    pub(crate) features: bool,
 }
 
 impl CodegenCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         if self.features {
             generate_lint_completions(Mode::Overwrite)?;
         }
diff --git a/xtask/src/codegen/gen_assists_docs.rs b/xtask/src/codegen/gen_assists_docs.rs
index 1ae1343a5..c469b388d 100644
--- a/xtask/src/codegen/gen_assists_docs.rs
+++ b/xtask/src/codegen/gen_assists_docs.rs
@@ -7,12 +7,12 @@ use crate::{
     project_root, rust_files_in, Result,
 };
 
-pub fn generate_assists_tests(mode: Mode) -> Result<()> {
+pub(crate) fn generate_assists_tests(mode: Mode) -> Result<()> {
     let assists = Assist::collect()?;
     generate_tests(&assists, mode)
 }
 
-pub fn generate_assists_docs(mode: Mode) -> Result<()> {
+pub(crate) fn generate_assists_docs(mode: Mode) -> Result<()> {
     let assists = Assist::collect()?;
     let contents = assists.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
     let contents = format!("//{}\n{}\n", PREAMBLE, contents.trim());
diff --git a/xtask/src/codegen/gen_diagnostic_docs.rs b/xtask/src/codegen/gen_diagnostic_docs.rs
index 7c14d4a07..a2561817b 100644
--- a/xtask/src/codegen/gen_diagnostic_docs.rs
+++ b/xtask/src/codegen/gen_diagnostic_docs.rs
@@ -7,7 +7,7 @@ use crate::{
     project_root, rust_files, Result,
 };
 
-pub fn generate_diagnostic_docs(mode: Mode) -> Result<()> {
+pub(crate) fn generate_diagnostic_docs(mode: Mode) -> Result<()> {
     let diagnostics = Diagnostic::collect()?;
     let contents =
         diagnostics.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
diff --git a/xtask/src/codegen/gen_feature_docs.rs b/xtask/src/codegen/gen_feature_docs.rs
index 61081063b..cad7ff477 100644
--- a/xtask/src/codegen/gen_feature_docs.rs
+++ b/xtask/src/codegen/gen_feature_docs.rs
@@ -7,7 +7,7 @@ use crate::{
     project_root, rust_files, Result,
 };
 
-pub fn generate_feature_docs(mode: Mode) -> Result<()> {
+pub(crate) fn generate_feature_docs(mode: Mode) -> Result<()> {
     let features = Feature::collect()?;
     let contents = features.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
     let contents = format!("//{}\n{}\n", PREAMBLE, contents.trim());
diff --git a/xtask/src/codegen/gen_lint_completions.rs b/xtask/src/codegen/gen_lint_completions.rs
index 8c51d35c7..b1c057037 100644
--- a/xtask/src/codegen/gen_lint_completions.rs
+++ b/xtask/src/codegen/gen_lint_completions.rs
@@ -10,7 +10,7 @@ use crate::{
     run_rustfmt,
 };
 
-pub fn generate_lint_completions(mode: Mode) -> Result<()> {
+pub(crate) fn generate_lint_completions(mode: Mode) -> Result<()> {
     if !Path::new("./target/rust").exists() {
         cmd!("git clone --depth=1 https://github.com/rust-lang/rust ./target/rust").run()?;
     }
diff --git a/xtask/src/codegen/gen_parser_tests.rs b/xtask/src/codegen/gen_parser_tests.rs
index 6e4abd10c..cb8939063 100644
--- a/xtask/src/codegen/gen_parser_tests.rs
+++ b/xtask/src/codegen/gen_parser_tests.rs
@@ -12,7 +12,7 @@ use crate::{
     project_root, Result,
 };
 
-pub fn generate_parser_tests(mode: Mode) -> Result<()> {
+pub(crate) fn generate_parser_tests(mode: Mode) -> Result<()> {
     let tests = tests_from_dir(&project_root().join(Path::new("crates/parser/src/grammar")))?;
     fn install_tests(tests: &HashMap<String, Test>, into: &str, mode: Mode) -> Result<()> {
         let tests_dir = project_root().join(into);
diff --git a/xtask/src/codegen/gen_syntax.rs b/xtask/src/codegen/gen_syntax.rs
index eb524d85a..191bc0e9d 100644
--- a/xtask/src/codegen/gen_syntax.rs
+++ b/xtask/src/codegen/gen_syntax.rs
@@ -18,7 +18,7 @@ use crate::{
     project_root, Result,
 };
 
-pub fn generate_syntax(mode: Mode) -> Result<()> {
+pub(crate) fn generate_syntax(mode: Mode) -> Result<()> {
     let grammar = rust_grammar();
     let ast = lower(&grammar);
 
diff --git a/xtask/src/dist.rs b/xtask/src/dist.rs
index 56bf9f99d..f2503f807 100644
--- a/xtask/src/dist.rs
+++ b/xtask/src/dist.rs
@@ -11,13 +11,13 @@ use xshell::{cmd, cp, mkdir_p, pushd, read_file, rm_rf, write_file};
 
 use crate::{date_iso, project_root};
 
-pub struct DistCmd {
-    pub nightly: bool,
-    pub client_version: Option<String>,
+pub(crate) struct DistCmd {
+    pub(crate) nightly: bool,
+    pub(crate) client_version: Option<String>,
 }
 
 impl DistCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         let dist = project_root().join("dist");
         rm_rf(&dist)?;
         mkdir_p(&dist)?;
diff --git a/xtask/src/install.rs b/xtask/src/install.rs
index 4c5c2673c..ea2194248 100644
--- a/xtask/src/install.rs
+++ b/xtask/src/install.rs
@@ -8,13 +8,13 @@ use xshell::{cmd, pushd};
 // Latest stable, feel free to send a PR if this lags behind.
 const REQUIRED_RUST_VERSION: u32 = 50;
 
-pub struct InstallCmd {
-    pub client: Option<ClientOpt>,
-    pub server: Option<ServerOpt>,
+pub(crate) struct InstallCmd {
+    pub(crate) client: Option<ClientOpt>,
+    pub(crate) server: Option<ServerOpt>,
 }
 
 #[derive(Clone, Copy)]
-pub enum ClientOpt {
+pub(crate) enum ClientOpt {
     VsCode,
     VsCodeExploration,
     VsCodeInsiders,
@@ -24,7 +24,7 @@ pub enum ClientOpt {
 }
 
 impl ClientOpt {
-    pub const fn as_cmds(&self) -> &'static [&'static str] {
+    pub(crate) const fn as_cmds(&self) -> &'static [&'static str] {
         match self {
             ClientOpt::VsCode => &["code"],
             ClientOpt::VsCodeExploration => &["code-exploration"],
@@ -60,18 +60,18 @@ impl std::str::FromStr for ClientOpt {
     }
 }
 
-pub struct ServerOpt {
-    pub malloc: Malloc,
+pub(crate) struct ServerOpt {
+    pub(crate) malloc: Malloc,
 }
 
-pub enum Malloc {
+pub(crate) enum Malloc {
     System,
     Mimalloc,
     Jemalloc,
 }
 
 impl InstallCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         if cfg!(target_os = "macos") {
             fix_path_for_mac().context("Fix path for mac")?
         }
diff --git a/xtask/src/lib.rs b/xtask/src/lib.rs
deleted file mode 100644
index b19985fb2..000000000
--- a/xtask/src/lib.rs
+++ /dev/null
@@ -1,131 +0,0 @@
-//! Support library for `cargo xtask` command.
-//!
-//! See https://github.com/matklad/cargo-xtask/
-
-pub mod codegen;
-mod ast_src;
-
-pub mod install;
-pub mod release;
-pub mod dist;
-pub mod pre_commit;
-pub mod metrics;
-pub mod pre_cache;
-
-use std::{
-    env,
-    path::{Path, PathBuf},
-};
-
-use walkdir::{DirEntry, WalkDir};
-use xshell::{cmd, pushd, pushenv};
-
-use crate::codegen::Mode;
-
-pub use anyhow::{bail, Context as _, Result};
-
-pub 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()
-}
-
-pub fn rust_files() -> impl Iterator<Item = PathBuf> {
-    rust_files_in(&project_root().join("crates"))
-}
-
-pub 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))
-}
-
-pub fn rust_files_in(path: &Path) -> impl Iterator<Item = PathBuf> {
-    files_in(path, "rs")
-}
-
-pub 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(())
-}
-
-pub 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(())
-}
-
-pub 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)
-    }
-}
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index cbb9b315e..84b17ce23 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -7,29 +7,37 @@
 //!
 //! 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 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<()> {
-    if env::args().next().map(|it| it.contains("pre-commit")) == Some(true) {
-        return pre_commit::run_hook();
-    }
-
     let _d = pushd(project_root())?;
 
     let mut args = Arguments::from_env();
@@ -90,14 +98,6 @@ FLAGS:
             finish_args(args)?;
             CodegenCmd { features }.run()
         }
-        "format" => {
-            finish_args(args)?;
-            run_rustfmt(Mode::Overwrite)
-        }
-        "install-pre-commit-hook" => {
-            finish_args(args)?;
-            pre_commit::install_hook()
-        }
         "lint" => {
             finish_args(args)?;
             run_clippy()
@@ -151,8 +151,6 @@ USAGE:
     cargo xtask <SUBCOMMAND>
 
 SUBCOMMANDS:
-    format
-    install-pre-commit-hook
     fuzz-tests
     codegen
     install
@@ -172,3 +170,110 @@ 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)
+    }
+}
diff --git a/xtask/src/metrics.rs b/xtask/src/metrics.rs
index 624ad3b7e..babc2a6d4 100644
--- a/xtask/src/metrics.rs
+++ b/xtask/src/metrics.rs
@@ -11,12 +11,12 @@ use xshell::{cmd, mkdir_p, pushd, pushenv, read_file, rm_rf};
 
 type Unit = String;
 
-pub struct MetricsCmd {
-    pub dry_run: bool,
+pub(crate) struct MetricsCmd {
+    pub(crate) dry_run: bool,
 }
 
 impl MetricsCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         let mut metrics = Metrics::new()?;
         if !self.dry_run {
             rm_rf("./target/release")?;
diff --git a/xtask/src/pre_cache.rs b/xtask/src/pre_cache.rs
index 569f88f68..54f4a95a9 100644
--- a/xtask/src/pre_cache.rs
+++ b/xtask/src/pre_cache.rs
@@ -6,12 +6,12 @@ use std::{
 use anyhow::Result;
 use xshell::rm_rf;
 
-pub struct PreCacheCmd;
+pub(crate) struct PreCacheCmd;
 
 impl PreCacheCmd {
     /// Cleans the `./target` dir after the build such that only
     /// dependencies are cached on CI.
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         let slow_tests_cookie = Path::new("./target/.slow_tests_cookie");
         if !slow_tests_cookie.exists() {
             panic!("slow tests were skipped on CI!")
diff --git a/xtask/src/pre_commit.rs b/xtask/src/pre_commit.rs
deleted file mode 100644
index 8f2dbea19..000000000
--- a/xtask/src/pre_commit.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-//! pre-commit hook for code formatting.
-
-use std::{fs, path::PathBuf};
-
-use anyhow::{bail, Result};
-use xshell::cmd;
-
-use crate::{project_root, run_rustfmt, Mode};
-
-// FIXME: if there are changed `.ts` files, also reformat TypeScript (by
-// shelling out to `npm fmt`).
-pub fn run_hook() -> Result<()> {
-    run_rustfmt(Mode::Overwrite)?;
-
-    let diff = cmd!("git diff --diff-filter=MAR --name-only --cached").read()?;
-
-    let root = project_root();
-    for line in diff.lines() {
-        let file = root.join(line);
-        cmd!("git update-index --add {file}").run()?;
-    }
-
-    Ok(())
-}
-
-pub fn install_hook() -> Result<()> {
-    let hook_path: PathBuf =
-        format!("./.git/hooks/pre-commit{}", std::env::consts::EXE_SUFFIX).into();
-
-    if hook_path.exists() {
-        bail!("Git hook already created");
-    }
-
-    let me = std::env::current_exe()?;
-    fs::copy(me, hook_path)?;
-
-    Ok(())
-}
diff --git a/xtask/src/release.rs b/xtask/src/release.rs
index 63556476d..5008881e4 100644
--- a/xtask/src/release.rs
+++ b/xtask/src/release.rs
@@ -4,12 +4,12 @@ use xshell::{cmd, cp, pushd, read_dir, write_file};
 
 use crate::{codegen, date_iso, is_release_tag, project_root, Mode, Result};
 
-pub struct ReleaseCmd {
-    pub dry_run: bool,
+pub(crate) struct ReleaseCmd {
+    pub(crate) dry_run: bool,
 }
 
 impl ReleaseCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         if !self.dry_run {
             cmd!("git switch release").run()?;
             cmd!("git fetch upstream --tags --force").run()?;
@@ -86,12 +86,12 @@ https://github.com/sponsors/rust-analyzer[GitHub Sponsors].
     }
 }
 
-pub struct PromoteCmd {
-    pub dry_run: bool,
+pub(crate) struct PromoteCmd {
+    pub(crate) dry_run: bool,
 }
 
 impl PromoteCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         let _dir = pushd("../rust-rust-analyzer")?;
         cmd!("git switch master").run()?;
         cmd!("git fetch upstream").run()?;
diff --git a/xtask/tests/tidy.rs b/xtask/src/tidy.rs
index a72498a38..63116ec6b 100644
--- a/xtask/tests/tidy.rs
+++ b/xtask/src/tidy.rs
@@ -4,7 +4,8 @@ use std::{
 };
 
 use xshell::{cmd, read_file};
-use xtask::{
+
+use crate::{
     cargo_files,
     codegen::{self, Mode},
     project_root, run_rustfmt, rust_files,