/
version.go
65 lines (54 loc) · 1017 Bytes
/
version.go
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package main
import (
"errors"
"fmt"
"log"
"os"
)
const format = "v%d.%d.%d"
const (
cmdMajor = "major"
cmdMinor = "minor"
cmdPatch = "patch"
)
var invalidCommand = errors.New("invalid command")
func usage() string {
return `version <major|minor|patch> <currentVersion>`
}
func command() (string, string, error) {
if len(os.Args) != 3 {
return "", "", invalidCommand
}
switch os.Args[1] {
case cmdMajor, cmdMinor, cmdPatch:
return os.Args[1], os.Args[2], nil
default:
return "", "", invalidCommand
}
}
func inc(cmd string, major, minor, patch *int) {
switch cmd {
case cmdMajor:
*major++
*minor = 0
*patch = 0
case cmdMinor:
*minor++
*patch = 0
case cmdPatch:
*patch++
}
}
func main() {
cmd, current, err := command()
if err != nil {
log.Fatalln(usage())
}
var major, minor, patch int
_, err = fmt.Sscanf(current, format, &major, &minor, &patch)
if err != nil {
log.Fatalln(err)
}
inc(cmd, &major, &minor, &patch)
fmt.Printf(format, major, minor, patch)
}