Add initial wasm32-wasi support

Cargo.toml

@@ -9,10 +9,8 @@ name = "ruff"
 [dependencies]
 anyhow = { version = "1.0.60" }
 bincode = { version = "1.3.3" }
-cacache = { version = "10.0.1" }
 chrono = { version = "0.4.21" }
 clap = { version = "4.0.1", features = ["derive"] }
-clearscreen = { version = "1.0.10" }
 colored = { version = "2.0.0" }
 common-path = { version = "1.0.0" }
 dirs = { version = "4.0.0" }
@@ -24,7 +22,7 @@ libcst = { git = "https://github.com/charliermarsh/LibCST", rev = "32a044c127668
 log = { version = "0.4.17" }
 notify = { version = "4.0.17" }
 once_cell = { version = "1.13.1" }
-path-absolutize = { version = "3.0.13", features = ["once_cell_cache"] }
+path-absolutize = { version = "3.0.14", features = ["once_cell_cache", "use_unix_paths_on_wasm"] }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
 rustpython-ast = { features = ["unparse"], git = "https://github.com/charliermarsh/RustPython.git", rev = "778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f" }
@@ -40,6 +38,15 @@ strum_macros = "0.24.3"
 num-bigint = "0.4.3"
 titlecase = "2.2.1"
 
+[target.'cfg(not(target_family = "wasm"))'.dependencies]
+cacache = { version = "10.0.1" } # uses async-std
+clearscreen = { version = "1.0.10" } # uses which
+
+# https://docs.rs/getrandom/0.2.7/getrandom/#webassembly-support
+# For (future) wasm-pack support
+[target.'cfg(all(target_family = "wasm", target_os = "unknown"))'.dependencies]
+getrandom = { version = "0.2.7", features = ["js"] }
+
 [dev-dependencies]
 assert_cmd = "2.0.4"
 insta = { version = "1.19.1", features = ["yaml"] }

src/cache.rs

@@ -1,10 +1,17 @@
+// cacache uses asyncd-std which has no wasm support, so currently no caching support on wasm
+#![cfg_attr(
+ target_family = "wasm",
+ allow(unused_imports, unused_variables, dead_code)
+)]
+
 use std::collections::hash_map::DefaultHasher;
 use std::fs::{create_dir_all, File, Metadata};
 use std::hash::{Hash, Hasher};
 use std::io::Write;
 use std::path::Path;
 
 use anyhow::Result;
+#[cfg(not(target_family = "wasm"))]
 use cacache::Error::EntryNotFound;
 use filetime::FileTime;
 use log::error;
@@ -107,6 +114,7 @@ pub fn get(
  return None;
  };
 
+ #[cfg(not(target_family = "wasm"))] // cacache needs async-std which doesn't support wasm
  match cacache::read_sync(cache_dir(), cache_key(path, settings, autofix)) {
  Ok(encoded) => match bincode::deserialize::<CheckResult>(&encoded[..]) {
  Ok(CheckResult {
@@ -137,12 +145,14 @@ pub fn set(
  return;
  };
 
+ #[cfg(not(target_family = "wasm"))] // modification date not supported on wasm
  let check_result = CheckResultRef {
  metadata: &CacheMetadata {
  mtime: FileTime::from_last_modification_time(metadata).unix_seconds(),
  },
  messages,
  };
+ #[cfg(not(target_family = "wasm"))] // cacache needs async-std which doesn't support wasm
  if let Err(e) = cacache::write_sync(
  cache_dir(),
  cache_key(path, settings, autofix),

src/linter.rs

@@ -4,6 +4,7 @@ use std::io::Write;
 use std::path::Path;
 
 use anyhow::Result;
+#[cfg(not(target_family = "wasm"))]
 use log::debug;
 use rustpython_parser::lexer::LexResult;
 use rustpython_parser::{lexer, parser};
@@ -122,6 +123,7 @@ pub fn lint_stdin(
  .collect())
 }
 
+#[cfg_attr(target_family = "wasm", allow(unused_variables))]
 pub fn lint_path(
  path: &Path,
  settings: &Settings,
@@ -131,6 +133,7 @@ pub fn lint_path(
  let metadata = path.metadata()?;
 
  // Check the cache.
+ #[cfg(not(target_family = "wasm"))]
  if let Some(messages) = cache::get(path, &metadata, settings, autofix, mode) {
  debug!("Cache hit for: {}", path.to_string_lossy());
  return Ok(messages);
@@ -166,6 +169,7 @@ pub fn lint_path(
  filename: path.to_string_lossy().to_string(),
  })
  .collect();
+ #[cfg(not(target_family = "wasm"))]
  cache::set(path, &metadata, settings, autofix, &messages, mode);
 
  Ok(messages)