CODEWITHSUNDEEP
goslackslack-api
jaxxstorm
jaxxstorm

Reputation: 13321

Slackbot that supports parameters wrapped with quotation marks

I am trying to write a slackbot. I've tried a variety of frameworks from github, but the most promising I've used seems to be hanu

What I'd like to do is send a message to a bot like so:

@bot <command> "Something" "Another thing that contains spaces" "A final thing with spaces"

I'd like to then have each of those 3 parameters be passed as strings to a var, which then has a handle func which can be executed.

I just don't seem to be able to do this! The hanu framework linked above seems to use this framework which states:

The allot library supports placeholders and regular expressions for parameter matching and parsing.

But because I'm a terrible developer, I can't seem to figure out how to do this in the framework above because there's no examples.

So I'd like to either be able to:

Upvotes: 0

Views: 664

Answers (1)

maerics
maerics

Reputation: 156642

One approach would be to abuse strings.FieldsFunc(...) to split the string on whitespace only if it is not in a quoted section:

func main() {
  s := `@bot <command> "Something" "Another thing that contains spaces, it's great" "A final thing with spaces"`

  tokens := splitWithQuotes(s)
  for i, t := range tokens {
    fmt.Printf("OK: tokens[%d] = %s\n", i, t)
  }
  // OK: tokens[0] = @bot
  // OK: tokens[1] = <command>
  // OK: tokens[2] = "Something"
  // OK: tokens[3] = "Another thing that contains spaces, it's great"
  // OK: tokens[4] = "A final thing with spaces"
}

func splitWithQuotes(s string) []string {
  inquote := false
  return strings.FieldsFunc(s, func(c rune) bool {
    switch {
    case c == '"':
      inquote = !inquote
      return false
    case inquote:
      return false
    default:
      return unicode.IsSpace(c)
    }
  })
}

Strictly speaking, this approach might not work with all versions of golang since, per the documentation:

If f does not return consistent results for a given c, FieldsFunc may crash.

...and this function definitely returns varying results for whitespace characters; however, it seems to work with go 1.9 and newer, so I guess it depends on your appetite for adventure!

Upvotes: 1

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