complete anywhere in the line

[rif]

Would it possible to have autocompletion for multiple words in the line?

For example: prompt> get_cost ArticleId=123

to be written like: type ge[TAB] than Ar[TAB]=123 and so on.

[peterh]

Yes, it is possible. Your completion function can (and should!) parse the input line to provide the best possible completion candidates.

For example, I have something like this at the top of my completion function:

if strings.HasPrefix(line, "load ") || strings.HasPrefix(line, "save ") {
        return completeFile(line)
}

if strings.HasPrefix(line, "set ") {
        list = make([]string, 0)
        // Get a list of all the command-line flags
        flag.VisitAll(func(f *flag.Flag) {
                candidate := "set "+f.Name+"="
                if strings.HasPrefix(candidate, line) {
                        list = append(list, candidate)
                }
        })
        return list
}

// normal first-word completion here

where completeFile reads the current directory for possible matches to the partial file name already typed (or all files if "load " is the entire line).

Treating all words equally for the purpose of completion would be a simple exercise in strings.Split() and strings.Join().