argf

This is a small Go library that reads lines of text from either a file or files specified in os.Args, or, if none are given, from stdin. It's similar to Ruby's ARGF or Perl's diamond operator.

This is mainly intended for tiny script-like CLI tools. Note that multiple goroutines should not call its functions concurrently.

Here's how to write a simple version of cat using argf:

package main

import (
  "fmt"
  "github.com/cespare/argf"
  "os"
)

func main() {
  for argf.Scan() {
    fmt.Println(argf.String())
  }
  if err := argf.Error(); err != nil {
    fmt.Println(err)
    os.Exit(1)
  }
}