gawp

A simple, configurable, file watching, job execution tool implemented in Go.

gawp
ɡɔːp/
verb, British, informal
stare openly in a stupid or rude manner.

Installation

go get -u gopkg.in/fsnotify.v1
go get -u gopkg.in/yaml.v2
go get -u github.com/martingallagher/gawp

The following assumes your Go $GOPATH/bin is on your $PATH environmental variable (export PATH=$PATH:$GOPATH/bin).

Configuration

By default Gawp attempts to read .gawp in the active directory. The file format is YAML.

The configuration file location can be set using the -config my.conf command-line flag.

Example .gawp file:

recursive: true           # Watch directories recursively, default: true
verbose: false            # Verbose logging, default: false
workers: 4                # Number of concurrent workers (high numbers can thrash IO), default: number CPUs / 2 (minimum 1)
# logfile: gawp.log        # Gawp logfile, default: stdout

# start:
#  - start myscript

# stop:
#  - echo STOPPING!

write, create, rename:    # Actionable events (supported: create, write, rename, remove, chmod), executed sequentially
  (?i)([a-z]+)\.src\.js$: # Rules are regular expression strings (https://code.google.com/p/re2/wiki/Syntax)
  - msg=`jshint $file`; if [ "$msg" ]; then notify-send -t 2000 "$msg"; fi
  - java -jar ~/compiler.jar -O=ADVANCED --language_in=ECMASCRIPT5_STRICT --formatting=SINGLE_QUOTES --define='DEBUG=false' --js_output_file=scripts/$1.js $file

  (?i)[a-z]+\.scss:
  - compass compile --boring --time -s compressed --css-dir styles/ $file
  - echo HELLO DENNIS!    # Rules can have multiple commands; output is written as-is to the Gawp log

create:
  .*:
  - echo created $file    # Rule submatches and file path can be accessed via $1, $2 ... $n (nth submatch) and $file

remove:
  .*:
  - echo removed $file

Configuration defaults fulfil most user's requirements, resulting in a config file that just defines rules:

write, create, rename:
  (?i)([a-z]+)\.src\.js$:
  - msg=`jshint $file`; if [ "$msg" ]; then notify-send -t 2000 "$msg"; fi
  - java -jar ~/compiler.jar -O=ADVANCED --language_in=ECMASCRIPT5_STRICT --formatting=SINGLE_QUOTES --define='DEBUG=false' --js_output_file=scripts/$1.js $file

  (?i)[a-z]+\.scss:
  - compass compile --boring -s compressed --css-dir styles/ $file

create:
  .*:
  - echo created $file

remove:
  .*:
  - echo removed $file

Usage

Assuming correctly configured web/assets/.gawp file: cd web/assets/ && gawp

Atomic Save Support

Some IDE's e.g. NetBeans, perform "atomic" saves. Gawp attempts to detect such operations, running the matching rule commands only once. The threshold duration setting for detecting atomic saves atomicthreshold can be adjusted if you find it is too liberal/conservative for your underlying storage.

Commands

Gawp does no command validation. It pre-processes them, replacing variables and executes blindly. Rules can contain subcommands, which is useful when you need to use subcommand results. For example, on Linux/Ubuntu you might wish to lint the edits to your JavaScript files and create an alert via notify-send:

write:
  (?i)([a-z]+)\.src\.js$:
  - msg=`jshint $file`; if [ "$msg" ]; then notify-send -t 2000 "$msg"; fi

If there's output from jshint, a notification bubble will be displayed to the user with the result.

Contributions

Bug fixes and feature requests welcome.

Contributors