# rerun /

Filename Size Date modified Message
rerun
10 B
101 B
1.6 KB
17 B
1.7 KB
3.1 KB
255 B
12 B
4.3 KB

## Rerun

Command-line executable Python script to re-run the given command every time files are modified in the current directory or its subdirectories.

## Usage

rerun [--help|-h] [--verbose|-v] [--ignore|-i=<file>] [--version] <command>


Where:

<command>           Command to execute
--help|-h           Show this help message and exit.
--ignore|-i=<file>  File or directory to ignore. Any directories of the
given name (and their subdirs) are excluded from the
search for changed files. Any modification to files of
the given name are ignored. The given value is
compared to basenames, so for example, "--ignore=def"
will skip the contents of directory "./abc/def/" and
will ignore file "./ghi/def". Can be specified multiple
times.
--verbose|-v        Display the names of changed files before the command
output.
--version           Show version number and exit.


## Description

Rerun detects changes to files by polling file modification times once per second. It looks in the current directory and all its subdirectories. On detecting any changes, it clears the terminal and reruns the given command.

It always ignores directories called .svn, .git, .hg, .bzr, build and dist.

It always ignores files ending with .pyc or .pyo.

e.g:

rerun python -m unittest mypackage.mymodule


will rerun your tests every time you save your source code, but it won't rerun the tests a second time when .pyo files get updated as a result of executing the tests. Handy for seeing the new test results in another console window after you hit 'save' in your editor, without having to change window focus.

## Dependencies

Tested on MacOSX, Ubuntu, WindowsXP, Windows 7.

Tested under Python2.7 or 3.2. May run under Python 2.6 or older with PyPI package 'argparse' installed.

No other dependencies.

## Install

pip install rerun


## Known Problems

Polling for modification times perhaps isn't ideal. Registering of OS-specific notifications of file system events might be better. In practice though, I haven't noticed it burden my machine in directories containing hundreds of files.

It might be handy if '--ignore' accepted globs, e.g. "*.tmp"

## Alternatives

PyPI package 'watchdog' is a cross-platform library for handling file-system events, which includes script 'watchmedo', which looks like a more serious and heavy-duty version of 'Rerun'.

## Thanks

The idea came from the Bash command 'watch', and inspiration for this implementation came from an old blog post by Jeff Winkler, whos website http://jeffwinkler.net seems to have now died.