RegexWriter

This is a simple helper to enable taking actions based on writer output. Personal use is parsing ffmpeg command-line output for video duration and completion percentage. Use it for all sorts of fun stuff!

Getting it

go get -u github.com/timdufrane/regexwriter

Using it

https://play.golang.org/p/xr3x5-wwDfu

package main

import (
	"github.com/timdufrane/regexwriter"
	"strings"
)

func main() {
	reWriter := regexwriter.RegexWriter{}

	// Add one match action
	reWriter.AddMatchAction("production", func([][]byte) {
		println("We're in production now, baby!")
	})

	// Maybe add another!
	reWriter.AddMatchAction("(?i)(te)(st)", func(b [][]byte) {
		println("Looks like this is a case-insensitive test string!")
		println("First part being", string(b[1]), "second part being", string(b[2]))
	})

	// Or add an action when something doesn't match? How novel!
	reWriter.AddNonMatchAction("production", func(b [][]byte) {
		println("This is definitely not a production string!")
		println("In fact, here's the string itself:", string(b[0]))
	})

	println("**Testing first string**")
	reader := strings.NewReader("This is a TEst string")

	reader.WriteTo(reWriter)

	println("**Testing second string**")
	reader = strings.NewReader("This is a production string")

	reader.WriteTo(reWriter)
}

Result

**Testing first string**
Looks like this is a case-insensitive test string!
First part being TE second part being st
This is definitely not a production string!
In fact, here's the string itself: This is a TEst string
**Testing second string**
We're in production now, baby!