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Add watch command (#5331)

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Reilly Wood 2022-04-28 07:26:34 -07:00 committed by GitHub
parent 3cf3329e49
commit f2d7454330
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5 changed files with 545 additions and 65 deletions
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@ -87,7 +87,7 @@ version = "0.12.1"
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"signal-hook",
]
@ -4094,7 +4253,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "66d72b759436ae32898a2af0a14218dbf55efde3feeb170eb623637db85ee1e0"
dependencies = [
"libc",
"winapi",
"winapi 0.3.9",
]
[[package]]
@ -4304,7 +4463,7 @@ dependencies = [
"cstr_core",
"libc",
"web-sys",
"winapi",
"winapi 0.3.9",
]
[[package]]
@ -4313,13 +4472,13 @@ version = "0.23.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4eea2ed6847da2e0c7289f72cb4f285f0bd704694ca067d32be811b2a45ea858"
dependencies = [
"cfg-if",
"cfg-if 1.0.0",
"core-foundation-sys",
"libc",
"ntapi",
"once_cell",
"rayon",
"winapi",
"winapi 0.3.9",
]
[[package]]
@ -4338,12 +4497,12 @@ version = "3.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5cdb1ef4eaeeaddc8fbd371e5017057064af0911902ef36b39801f67cc6d79e4"
dependencies = [
"cfg-if",
"cfg-if 1.0.0",
"fastrand",
"libc",
"redox_syscall",
"remove_dir_all",
"winapi",
"winapi 0.3.9",
]
[[package]]
@ -4373,7 +4532,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "633c1a546cee861a1a6d0dc69ebeca693bf4296661ba7852b9d21d159e0506df"
dependencies = [
"libc",
"winapi",
"winapi 0.3.9",
]
[[package]]
@ -4436,7 +4595,7 @@ checksum = "6db9e6914ab8b1ae1c260a4ae7a49b6c5611b40328a735b21862567685e73255"
dependencies = [
"libc",
"wasi 0.10.0+wasi-snapshot-preview1",
"winapi",
"winapi 0.3.9",
]
[[package]]
@ -4473,11 +4632,11 @@ dependencies = [
"bytes",
"libc",
"memchr",
"mio",
"mio 0.8.2",
"num_cpus",
"pin-project-lite",
"socket2",
"winapi",
"winapi 0.3.9",
]
[[package]]
@ -4525,7 +4684,7 @@ version = "0.1.34"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5d0ecdcb44a79f0fe9844f0c4f33a342cbcbb5117de8001e6ba0dc2351327d09"
dependencies = [
"cfg-if",
"cfg-if 1.0.0",
"pin-project-lite",
"tracing-attributes",
"tracing-core",
@ -4808,7 +4967,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
dependencies = [
"same-file",
"winapi",
"winapi 0.3.9",
"winapi-util",
]
@ -4846,7 +5005,7 @@ version = "0.2.80"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "27370197c907c55e3f1a9fbe26f44e937fe6451368324e009cba39e139dc08ad"
dependencies = [
"cfg-if",
"cfg-if 1.0.0",
"wasm-bindgen-macro",
]
@ -4871,7 +5030,7 @@ version = "0.4.30"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6f741de44b75e14c35df886aff5f1eb73aa114fa5d4d00dcd37b5e01259bf3b2"
dependencies = [
"cfg-if",
"cfg-if 1.0.0",
"js-sys",
"wasm-bindgen",
"web-sys",
@ -4947,6 +5106,12 @@ dependencies = [
"libc",
]
[[package]]
name = "winapi"
version = "0.2.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
[[package]]
name = "winapi"
version = "0.3.9"
@ -4957,6 +5122,12 @@ dependencies = [
"winapi-x86_64-pc-windows-gnu",
]
[[package]]
name = "winapi-build"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
[[package]]
name = "winapi-i686-pc-windows-gnu"
version = "0.4.0"
@ -4969,7 +5140,7 @@ version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
dependencies = [
"winapi",
"winapi 0.3.9",
]
[[package]]
@ -5100,7 +5271,17 @@ version = "0.10.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
dependencies = [
"winapi",
"winapi 0.3.9",
]
[[package]]
name = "ws2_32-sys"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
dependencies = [
"winapi 0.2.8",
"winapi-build",
]
[[package]]

1
crates/nu-command/Cargo.toml
View file

@ -53,6 +53,7 @@ lscolors = { version = "0.9.0", features = ["crossterm"]}
md5 = { package = "md-5", version = "0.10.0" }
meval = "0.2.0"
mime = "0.3.16"
notify = "4.0.17"
num = { version = "0.4.0", optional = true }
pathdiff = "0.2.1"
quick-xml = "0.22"

1
crates/nu-command/src/default_context.rs
View file

@ -199,6 +199,7 @@ pub fn create_default_context(cwd: impl AsRef<Path>) -> EngineState {
Save,
Touch,
Glob,
Watch,
};
// Platform

2
crates/nu-command/src/filesystem/mod.rs
View file

@ -9,6 +9,7 @@ mod rm;
mod save;
mod touch;
mod util;
mod watch;
pub use cd::Cd;
pub use cp::Cp;
@ -21,3 +22,4 @@ pub use rm::Rm;
pub use save::Save;
pub use touch::Touch;
pub use util::BufferedReader;
pub use watch::Watch;

295
crates/nu-command/src/filesystem/watch.rs Normal file
View file

@ -0,0 +1,295 @@
use std::path::PathBuf;
use std::sync::atomic::Ordering;
use std::sync::mpsc::{channel, RecvTimeoutError};
use std::time::Duration;
use notify::{DebouncedEvent, RecommendedWatcher, RecursiveMode, Watcher};
use nu_engine::{current_dir, eval_block, CallExt};
use nu_protocol::ast::Call;
use nu_protocol::engine::{CaptureBlock, Command, EngineState, Stack};
use nu_protocol::{
Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, Spanned, SyntaxShape,
Value,
};
// durations chosen mostly arbitrarily
const CHECK_CTRL_C_FREQUENCY: Duration = Duration::from_millis(100);
const DEFAULT_WATCH_DEBOUNCE_DURATION: Duration = Duration::from_millis(100);
#[derive(Clone)]
pub struct Watch;
impl Command for Watch {
fn name(&self) -> &str {
"watch"
}
fn usage(&self) -> &str {
"Watch for file changes and execute Nu code when they happen."
}
fn search_terms(&self) -> Vec<&str> {
vec!["watcher", "reload", "filesystem"]
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("watch")
.required("path", SyntaxShape::Filepath, "the path to watch. Can be a file or directory")
.required("block", SyntaxShape::Block(None), "A Nu block of code to run whenever a file changes. The block will be passed `operation`, `path`, and `new_path` (for renames only) arguments in that order")
.named(
"debounce-ms",
SyntaxShape::Int,
"Debounce changes for this many milliseconds (default: 100). Adjust if you find that single writes are reported as multiple events",
Some('d'),
)
.named(
"glob",
SyntaxShape::String, // SyntaxShape::GlobPattern gets interpreted relative to cwd, so use String instead
"Only report changes for files that match this glob pattern (default: all files)",
Some('g'),
)
.named(
"recursive",
SyntaxShape::Boolean,
"Watch all directories under <path> recursively. Will be ignored if <path> is a file (default: true)",
Some('r'),
)
.switch("verbose", "Operate in verbose mode (default: false)", Some('v'))
.category(Category::FileSystem)
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
_input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let cwd = current_dir(engine_state, stack)?;
let path_arg: Spanned<String> = call.req(engine_state, stack, 0)?;
let path_no_whitespace = &path_arg
.item
.trim_end_matches(|x| matches!(x, '\x09'..='\x0d'));
let path = match nu_path::canonicalize_with(path_no_whitespace, &cwd) {
Ok(p) => p,
Err(e) => {
return Err(ShellError::DirectoryNotFound(
path_arg.span,
Some(format!("IO Error: {:?}", e)),
))
}
};
let capture_block: CaptureBlock = call.req(engine_state, stack, 1)?;
let block = engine_state
.clone()
.get_block(capture_block.block_id)
.clone();
let verbose = call.has_flag("verbose");
let debounce_duration_flag: Option<Spanned<i64>> =
call.get_flag(engine_state, stack, "debounce-ms")?;
let debounce_duration = match debounce_duration_flag {
Some(val) => match u64::try_from(val.item) {
Ok(val) => Duration::from_millis(val),
Err(_) => {
return Err(ShellError::UnsupportedInput(
"Input out of range".to_string(),
val.span,
))
}
},
None => DEFAULT_WATCH_DEBOUNCE_DURATION,
};
let glob_flag: Option<Spanned<String>> = call.get_flag(engine_state, stack, "glob")?;
let glob_pattern = match glob_flag {
Some(glob) => {
let absolute_path = path.join(glob.item);
if verbose {
eprintln!("Absolute glob path: {absolute_path:?}");
}
match nu_glob::Pattern::new(&absolute_path.to_string_lossy()) {
Ok(pattern) => Some(pattern),
Err(_) => return Err(ShellError::UnsupportedInput("".to_string(), glob.span)),
}
}
None => None,
};
let recursive_flag: Option<Spanned<bool>> =
call.get_flag(engine_state, stack, "recursive")?;
let recursive_mode = match recursive_flag {
Some(recursive) => {
if recursive.item {
RecursiveMode::Recursive
} else {
RecursiveMode::NonRecursive
}
}
None => RecursiveMode::Recursive,
};
let ctrlc_ref = &engine_state.ctrlc.clone();
let (tx, rx) = channel();
let mut watcher: RecommendedWatcher = match Watcher::new(tx, debounce_duration) {
Ok(w) => w,
Err(e) => {
return Err(ShellError::IOError(format!(
"Failed to create watcher: {e}"
)))
}
};
if let Err(e) = watcher.watch(path.clone(), recursive_mode) {
return Err(ShellError::IOError(format!("Failed to start watcher: {e}")));
}
eprintln!("Now watching files at {path:?}. Press ctrl+c to abort.");
let event_handler =
|operation: &str, path: PathBuf, new_path: Option<PathBuf>| -> Result<(), ShellError> {
let glob_pattern = glob_pattern.clone();
let matches_glob = match glob_pattern.clone() {
Some(glob) => glob.matches_path(&path),
None => true,
};
if verbose && glob_pattern.is_some() {
eprintln!("Matches glob: {matches_glob}");
}
if matches_glob {
let stack = &mut stack.clone();
if let Some(position) = block.signature.get_positional(0) {
if let Some(position_id) = &position.var_id {
stack.add_var(
*position_id,
Value::String {
val: operation.to_string(),
span: call.span(),
},
);
}
}
if let Some(position) = block.signature.get_positional(1) {
if let Some(position_id) = &position.var_id {
stack.add_var(
*position_id,
Value::String {
val: path.to_string_lossy().to_string(),
span: call.span(),
},
);
}
}
if let Some(position) = block.signature.get_positional(2) {
if let Some(position_id) = &position.var_id {
stack.add_var(
*position_id,
Value::String {
val: new_path
.unwrap_or_else(|| "".into())
.to_string_lossy()
.to_string(),
span: call.span(),
},
);
}
}
let eval_result = eval_block(
engine_state,
stack,
&block,
Value::Nothing { span: call.span() }.into_pipeline_data(),
call.redirect_stdout,
call.redirect_stderr,
);
match eval_result {
Ok(val) => {
val.print(engine_state, stack)?;
}
Err(err) => {
// TODO: this isn't as nice as the Miette errors. Find a way to print those.
// Unfortunately can't just wrap err in PipelineData, PipelineData.print() doesn't work that way
eprintln!("{err:?}");
}
}
}
Ok(())
};
loop {
match rx.recv_timeout(CHECK_CTRL_C_FREQUENCY) {
Ok(event) => {
if verbose {
eprintln!("{:?}", event);
}
let handler_result = match event {
DebouncedEvent::Create(path) => event_handler("Create", path, None),
DebouncedEvent::Write(path) => event_handler("Write", path, None),
DebouncedEvent::Remove(path) => event_handler("Remove", path, None),
DebouncedEvent::Rename(path, new_path) => {
event_handler("Rename", path, Some(new_path))
}
DebouncedEvent::Error(err, path) => match path {
Some(path) => Err(ShellError::IOError(format!(
"Error detected for {path:?}: {err:?}"
))),
None => Err(ShellError::IOError(format!("Error detected: {err:?}"))),
},
// These are less likely to be interesting events
DebouncedEvent::Chmod(_)
| DebouncedEvent::NoticeRemove(_)
| DebouncedEvent::NoticeWrite(_)
| DebouncedEvent::Rescan => Ok(()),
};
handler_result?;
}
Err(RecvTimeoutError::Disconnected) => {
return Err(ShellError::IOError(
"Unexpected disconnect from file watcher".into(),
));
}
Err(RecvTimeoutError::Timeout) => {}
}
if let Some(ctrlc) = ctrlc_ref {
if ctrlc.load(Ordering::SeqCst) {
break;
}
}
}
Ok(PipelineData::new(call.head))
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Run `cargo test` whenever a Rust file changes",
example: r#"watch . --glob=**/*.rs { cargo test }"#,
result: None,
},
Example {
description: "Watch all changes in the current directory",
example: r#"watch . { |op, path, new_path| $"($op) ($path) ($new_path)"}"#,
result: None,
},
Example {
description: "Log all changes in a directory",
example: r#"watch /foo/bar { |op, path| $"($op) - ($path)(char nl)" | save --append changes_in_bar.log }"#,
result: None,
},
]
}
}