quickfix

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The goquickfix command quick fixes Go source that is well typed but
Go refuses to compile e.g. "x declared and not used".

== Installation

    go get github.com/motemen/go-quickfix/cmd/goquickfix

== Usage

    goquickfix [-w] [-revert] <path>...

    Flags:
      -revert=false: try to revert possible quickfixes introduced by goquickfix
      -w=false: write result to (source) file instead of stdout

== Description

While coding, sometimes you may write a Go program that is completely well typed
but `go build` (or `run` or `test`) refuses to build, like this:

[source,go]
----
package main

import (
	"fmt"
	"log"
)

func main() {
	nums := []int{3, 1, 4, 1, 5}
	for i, n := range nums {
		fmt.Println(n)
	}
}
----

The Go compiler will complain:

    eg.go:5: imported and not used: "log"

Or

    eg.go:9: i declared and not used

Do we have to bother to comment out the import line or remove
the unused identifier one by one for the Go compiler? Of course no,
`goquickfix` does the work instead of you.

Run

    goquickfix -w eg.go

and you will get the source rewritten so that Go compiles it well without
changing the semantics:

[source,go]
----
package main

import (
	"fmt"
	_ "log"
)

func main() {
	nums := []int{3, 1, 4, 1, 5}
	for i, n := range nums {
		fmt.Println(n)
		_ = i
	}
}
----

Now you can `go run` or `go test` your code safely.

== TODO

* `-d` option to show diffs
* `-hard=true` option to remove erroneous code rather than adding new code