Pawnd

A tool of running commands on file change and other triggers. There are a lot like it and this one is mine.

Installation

$ go get github.com/kopoli/pawnd

Description

The idea is to have a terminal window that displays the current status of building, running tests, running lint etc. The window displays the output of each process in a distinct manner. At the bottom there would be a summary of the commands, whether they failed or succeeded.

Example with animations

The Pawnfile that is used in the above:

[godoc]
init
daemon=godoc -http=:6060

[gochange]
file=**/*.go
changed=gobuild

[gobuild]
init
exec=go build
succeeded=gotest megacheck

[gotest]
exec=go test ./lib/...

[megacheck]
exec=megacheck

[failing]
init
exec="/bin/sh -c 'sleep 2 && echo This fails 1>&2 && false'"

Basic usage

Create a Pawnfile in the directory.
Run pawnd.

Pawnfile reference

The format is an ini-file.
The section names are arbitrary names that are referred to by other sections and displayed on screen.
Each of the sections will have exactly one of the following keys:
- file
- signal
- cron
- exec
- daemon
- script.
The keys trigger sections depending on their rules. The exec, script and daemon keys run commands as well.

Triggers

file

The value is recursive globbing pattern that will trigger when a file matching the pattern changes.

Globbing patterns are handled by https://github.com/mattn/go-zglob

Triggered sections are listed in the changed list.

Can have optional key hysteresis which will delay triggering until the given timeout has run out. The timeout is parsed by https://godoc.org/time#ParseDuration

Minimal example:

[change]
file=README
hysteresis=5s
changed=checksum stat

[checksum]
exec=md5sum README

[stat]
exec=stat README

cron

The value is a cron like pattern that will trigger when said time is reached.

Cron functionality is handled by https://godoc.org/github.com/robfig/cron

Triggered sections are listed in the triggered list.

Minimal example:

[daily]
cron=@daily
triggered=show-date

[show-date]
exec=date

signal

The value is signal name. Either sigusr1 or sigusr2. This is only supported on UNIX.

Triggered sections are listed in the triggered list.

Minimal example:

[sigusr1]
signal=sigusr1
triggered=clean

[clean]
exec=make clean

exec, script and daemon

These triggers will run commands in addition to triggering additional sections.

The exec and script are synonymous. They both run a POSIX compatible shell scripts.

The difference between exec and daemon is that exec is expected to stop and daemon is supposed to run indefinitely.

These sections can have the init key. It means the sections will run on start. The init key has no value.

If the command succeeds it will trigger the sections listed in the succeeded list. If the command fails, then failed are triggered.

Can have optional key cooldown which will delay running the same command again before the timeout has run out.

exec have optional key timeout, which terminate the command after the timeout has run out.

The timeouts are parsed by https://godoc.org/time#ParseDuration

Can have an optional key visible which is a boolean key of values true and false. If this is false the command is not visible at the bottom of the pawnd output. By default exec and daemon commands are visible.

Example:

[godoc]
init
daemon=godoc -http=:6060

[gochange]
file=**/*.go
changed=gobuild

[gobuild]
init
exec=go build
succeeded=gotest

[gotest]
exec=go test ./lib/...

License

MIT license