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target
Cargo.lock
target

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[package]
name = "runwhen"
version = "0.1.0"
authors = ["Jeremy Wall <jeremy@marzhillstudios.com>"]
description = "Runs a command on user specified triggers."
[dependencies]
clap = "~2.19.0"
humantime = "~1.0.0"
notify = "~3.0.0"
md5 = "~0.3.2"
subprocess = "~0.1.7"

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# runwhen - A utility that executes commands on user defined triggers.
## Usage
```
Runs a command on user defined triggers.
USAGE:
runwhen --cmd <cmd> [SUBCOMMAND]
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
-c, --cmd <cmd> Command to run on supplied triggers
SUBCOMMANDS:
help Prints this message or the help of the given subcommand(s)
success Trigger that fires if a command runs successful.
timer Trigger that fires on a timer.
watch Trigger that fires when a file or directory changes.
```
## Description
I wanted a project to learn Rust on and this one scratches an itch I've had for
a while. runwhen executes a command on a user specified trigger. There are other
utilities out there that will execute on a timer or when a file changes but I
haven't seen any that bundled all the types of triggers into one utility.

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// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::error::Error;
use std::fmt;
use notify;
#[derive(Debug)]
pub struct CommandError {
msg: String,
}
impl CommandError {
pub fn new(msg: String) -> CommandError {
CommandError{
msg: msg
}
}
}
impl fmt::Display for CommandError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self.msg)
}
}
impl From<notify::Error> for CommandError {
fn from(e: notify::Error) -> CommandError {
CommandError::new(e.description().to_string())
}
}

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// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use notify::DebouncedEvent;
#[derive(PartialEq,Clone)]
pub enum WatchEventType {
Touched,
Changed,
Error,
Ignore
}
impl From<DebouncedEvent> for WatchEventType {
fn from(e: DebouncedEvent) -> WatchEventType {
println!("Found event: {:?}", e);
match e {
DebouncedEvent::Chmod(_) => WatchEventType::Touched,
DebouncedEvent::Create(_) => WatchEventType::Touched,
DebouncedEvent::Remove(_) => WatchEventType::Changed,
DebouncedEvent::Rename(_, _) => WatchEventType::Changed,
DebouncedEvent::Write(_) => WatchEventType::Changed,
DebouncedEvent::NoticeRemove(_) => WatchEventType::Ignore,
DebouncedEvent::NoticeWrite(_) => WatchEventType::Ignore,
DebouncedEvent::Rescan => WatchEventType::Ignore,
DebouncedEvent::Error(_, _) => WatchEventType::Ignore
}
}
}

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// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::thread;
use std::time::Duration;
use subprocess::{Exec,PopenError,ExitStatus};
use traits::Process;
use error::CommandError;
pub fn run_cmd(cmd: &str) -> Result<(), PopenError> {
Exec::shell(cmd).join()?;
Ok(())
}
fn is_cmd_success(cmd: &str) -> bool {
match Exec::shell(cmd).join() {
Ok(ExitStatus::Exited(code)) => code == 0,
_ => false,
}
}
pub struct ExecProcess<'a> {
test_cmd: &'a str,
cmd: &'a str,
poll: Duration,
}
impl<'a> ExecProcess<'a> {
pub fn new(test_cmd: &'a str, cmd: &'a str, poll: Duration) -> ExecProcess<'a> {
ExecProcess{test_cmd: test_cmd, cmd: cmd, poll: poll}
}
}
impl<'a> Process for ExecProcess<'a> {
fn run(&self) -> Result<(), CommandError> {
loop {
if is_cmd_success(self.test_cmd) {
if let Err(err) = run_cmd(self.cmd) {
println!("{:?}", err)
}
}
thread::sleep(self.poll);
}
}
}

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// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::thread;
use std::sync::{Arc,RwLock};
use std::time::Duration;
use std::path::Path;
use std::sync::mpsc::channel;
use notify::{Watcher,RecursiveMode,watcher};
use traits::Process;
use error::CommandError;
use events::WatchEventType;
use exec::run_cmd;
pub struct FileProcess<'a> {
cmd: &'a str,
file: &'a str,
method: WatchEventType,
poll: Duration,
}
impl<'a> FileProcess<'a> {
pub fn new(cmd: &'a str, file: &'a str, method: WatchEventType, poll: Duration) -> FileProcess<'a> {
FileProcess{ cmd: cmd, file: file, method: method, poll: poll}
}
}
fn spawn_runner_thread(lock: Arc<RwLock<bool>>, cmd: String, poll: Duration) {
thread::spawn(move || {
loop {
// Wait our requisit number of seconds
thread::sleep(poll);
// Default to not running the command.
let should_run = { // get a new scope for our read lock.
// Check our evt drop off.
*(lock.read().unwrap())
}; // drop our read lock
if should_run {
{ // Set a new scope for our write lock.
let mut signal = lock.write().unwrap();
// set signal to false so we won't trigger on the
// next loop iteration unless we recieved more events.
*signal = false;
// Run our command!
if let Err(err) = run_cmd(&cmd) {
println!("{:?}", err)
}
} // drop our write lock.
}
}
});
}
fn wait_for_fs_events(lock: Arc<RwLock<bool>>, method: WatchEventType, file: &str) -> Result<(), CommandError> {
// Notify requires a channel for communication.
let (tx, rx) = channel();
let mut watcher = try!(watcher(tx, Duration::from_secs(1)));
// TODO(jwall): Better error handling.
try!(watcher.watch(file, RecursiveMode::Recursive));
println!("Watching {:?}", file);
loop {
let evt: WatchEventType = match rx.recv() {
Ok(event) => {
WatchEventType::from(event)
},
Err(_) => {
WatchEventType::Error
}
};
match evt {
WatchEventType::Ignore => {
// We ignore this one.
},
WatchEventType::Error => {
// We log this one.
},
WatchEventType::Touched => {
if method == WatchEventType::Touched {
let mut signal = lock.write().unwrap();
*signal = true;
}
},
WatchEventType::Changed => {
let mut signal = lock.write().unwrap();
*signal = true;
}
}
}
}
impl<'a> Process for FileProcess<'a> {
fn run(&self) -> Result<(), CommandError> {
// NOTE(jwall): this is necessary because notify::fsEventWatcher panics
// if the path doesn't exist. :-(
if !Path::new(self.file).exists() {
return Err(CommandError::new(format!("No such path! {0}", self.file).to_string()))
}
// TODO(jeremy): Is this sufficent or do we want to ignore
// any events that come in while the command is running?
let lock = Arc::new(RwLock::new(false));
spawn_runner_thread(lock.clone(), self.cmd.to_string(), self.poll);
wait_for_fs_events(lock, self.method.clone(), self.file)
}
}

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// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#[macro_use]
extern crate clap;
extern crate humantime;
extern crate md5;
extern crate notify;
extern crate subprocess;
use std::process;
use std::str::FromStr;
mod traits;
mod file;
mod timer;
mod error;
mod events;
mod exec;
use traits::Process;
use file::FileProcess;
use timer::TimerProcess;
use exec::ExecProcess;
use events::WatchEventType;
fn do_flags<'a>() -> clap::ArgMatches<'a> {
clap_app!(
runwhen =>
(version: crate_version!())
(author: crate_authors!())
(about: "Runs a command on user defined triggers.")
(@arg cmd: -c --cmd +required +takes_value "Command to run on supplied triggers")
(@subcommand watch =>
(about: "Trigger that fires when a file or directory changes.")
// TODO(jeremy): We need to support filters
(@arg file: -f --file +takes_value "File/Directory to watch. (default current working directory)")
(@arg filetouch: --touch "Watches for attribute modifications as well as content changes.")
(@arg wait: --poll +takes_value "How frequently to poll for events (default 5s)")
)
(@subcommand timer =>
(about: "Trigger that fires on a timer.")
(@arg duration: -t --duration +required +takes_value "Defines timer frequency.")
(@arg repeat: -n --repeat +takes_value "Defines an optional max number times to run on repeat.")
)
(@subcommand success =>
(about: "Trigger that fires if a command runs successful.")
(@arg ifcmd: --if +required +takes_value "The command to test for successful exit from")
(@arg wait: --poll +takes_value "How frequently to test command (default 5s)")
)
).get_matches()
}
fn main() {
let app = do_flags();
// Unwrap because this flag is required.
let cmd = app.value_of("cmd").unwrap();
let mut process: Option<Box<Process>> = None;
if let Some(matches) = app.subcommand_matches("watch") {
// Unwrap because this flag is required.
let file = matches.value_of("file").unwrap_or(".");
let mut method = WatchEventType::Changed;
if matches.is_present("filetouch") {
method = WatchEventType::Touched;
}
let poll = matches.value_of("poll").unwrap_or("5s");
let dur = humantime::parse_duration(poll).unwrap();
process = Some(Box::new(FileProcess::new(cmd, file, method, dur)));
} else if let Some(matches) = app.subcommand_matches("timer") {
// Unwrap because this flag is required.
let dur = humantime::parse_duration(matches.value_of("duration").unwrap());
match dur {
Ok(duration) =>{
let max_repeat = if let Some(val) = matches.value_of("repeat") {
match u32::from_str(val) {
Ok(n) => Some(n),
Err(e) => {
println!("Invalid --repeat value {}", e);
println!("{}", matches.usage());
process::exit(1)
}
}
} else {
None
};
process = Some(Box::new(TimerProcess::new(cmd, duration, max_repeat)));
},
Err(msg) => {
println!("Malformed duration {:?}", msg);
process::exit(1);
}
}
} else if let Some(matches) = app.subcommand_matches("success") {
// unwrap because this is required.
let ifcmd = matches.value_of("ifcmd").unwrap();
let dur = humantime::parse_duration(
matches.value_of("poll").unwrap_or("5s"));
process = match dur {
Ok(duration) => Some(Box::new(ExecProcess::new(ifcmd, cmd, duration))),
Err(msg) => {
println!("Malformed poll {:?}", msg);
process::exit(1)
}
}
}
match process {
Some(process) => match process.run() {
Ok(_) => return,
Err(err) => {
println!("{0}", err);
process::exit(1)
}
},
None => {
println!("You must specify a subcommand.");
process::exit(1)
},
}
}

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// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::thread;
use std::time::Duration;
use traits::Process;
use error::CommandError;
use exec::run_cmd;
pub struct TimerProcess<'a> {
cmd: &'a str,
poll_duration: Duration,
max_repeat: Option<u32>
}
impl<'a> TimerProcess<'a> {
pub fn new(cmd: &'a str, poll_duration: Duration, max_repeat: Option<u32>) -> TimerProcess<'a> {
TimerProcess{cmd: cmd, poll_duration: poll_duration, max_repeat: max_repeat}
}
}
impl<'a> Process for TimerProcess<'a> {
fn run(&self) -> Result<(), CommandError> {
let mut counter = 0;
loop {
if self.max_repeat.is_some() && counter >= self.max_repeat.unwrap() {
return Ok(());
}
if let Err(err) = run_cmd(self.cmd) {
println!("{:?}", err)
}
thread::sleep(self.poll_duration);
if self.max_repeat.is_some() { counter += 1 }
}
}
}

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// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use error::CommandError;
pub trait Process {
fn run(&self) -> Result<(), CommandError>;
}