Create a io.Reader from a local file

Question

I would like to open a local file, and return a io.Reader. The reason is that I need to feed a io.Reader to a library I am using, like:

Answer 1

Here is an example where we open a text file and create an io.Reader from the returned *os.File instance f

package main

import (
    "io"
    "os"
)

func main() {
    f, err := os.Open("somefile.txt")
    if err != nil {
        panic(err)
    }
    defer f.Close()

    var r io.Reader
    r = f
}