prefixer

Prefixer

Golang's io.Reader wrapper prepending every line with a given string.

Use cases

1. Logger that prefixes every line with a timestamp etc.

   16:54:49 My awesome server | Creating etcd client pointing to http://localhost:4001
   16:54:49 My awesome server | Listening on http://localhost:8080
   16:54:49 My awesome server | [restful/swagger] listing is available at 127.0.0.1:8080/swaggerapi
   

2. SSH multiplexer prepending output from multiple servers with a hostname

   host1.example.com | SUCCESS
   host2.example.com | SUCCESS
   host3.example.com | -bash: cd: workdir: No such file or directory
   host4.example.com | SUCCESS
   

3. Create an email reply ("> " prefix) from any text easily.

   $ ./prefix
   Dear John,               
   did you know that https://github.com/goware/prefixer is a golang pkg
   that prefixes every line with a given string and accepts any io.Reader?
   
   Cheers,
   - Jane
   ^D     
   > Dear John,               
   > did you know that https://github.com/goware/prefixer is a golang pkg
   > that prefixes every line with a given string and accepts any io.Reader?
   >
   > Cheers,
   > - Jane
   

Example

See the "Prefix Line Reader" example.

package main

import (
    "io/ioutil"
    "os"

    "github.com/goware/prefixer"
)

func main() {
    // Prefixer accepts anything that implements io.Reader interface
    prefixReader := prefixer.New(os.Stdin, "> ")

    // Read all prefixed lines from STDIN into a buffer
    buffer, _ := ioutil.ReadAll(prefixReader)

    // Write buffer to STDOUT
    os.Stdout.Write(buffer)
}

License

Prefixer is licensed under the MIT License.