Fwatcher

Auto run command when some files changed.

Install

fwatcher is implemented by rust language, so you need cargo command:

cargo install fwatcher

fwatcher will be installed in your cargo binary directory(~/.cargo/bin/).

CLI

fwarcher can be use as a command:

$ fwatcher -h
Usage:
    fwatcher [options] CMD

Options:
    -h, --help          Display this message
    -v, --version       Print version info
    -r, --restart       Auto restart command, default to false
    -d, --directory <dir>
                        Watch directory, default to current directory
    -p, --pattern <pattern>
                        Watch file glob pattern, default to "*"
    -P, --exclude_pattern <exclude_pattern>
                        Watch file glob pattern exclusively, default null
        --delay <second>
                        Delay in seconds for watcher, default to 2
    -i, --interval <second>
                        Interval in seconds to scan filesystem, default to 1

For example to search recursively for python files in the current directory and run pytest when a file is updated:

fwatcher -p "**/*.py" pytest --maxfail=2

you can also use more than one directory/pattern option:

fwatcher -d src -d test -p "**/*.py" -p "**/*.html" pytest --maxfail=2

The --restart option kills the command if it's still running when a filesystem change happens. Can be used to restart locally running webservers on updates, or kill long running tests and restart on updates:

fwatcher -d src -p "**/*.py" --restart run_forever_cmd

Rust Lib

Dependencies in your project's Cargo.toml:

[dependencies]
glob = "0.2"
notify = "4.0"
fwatcher = "*"

The following example shows simple usage:

extern crate glob;
extern crate fwatcher;

use fwatcher::Fwatcher;
use glob::Pattern;
use std::path::PathBuf;
use std::time::Duration;


fn main() {
    let dirs =vec![PathBuf::from("src")];
    let cmd = vec!["pytest".to_string()];

    let mut fwatcher = Fwatcher::new(dirs, cmd);
    fwatcher.pattern(Pattern::new("**/*.py").unwrap())
            .exclude_pattern(Pattern::new("**/.git/**").unwrap())
            .interval(Duration::new(1, 0))
            .restart(false)
            .run();
}