package complete
import (
"os"
"path/filepath"
"strings"
"unicode"
)
// Args describes command line arguments
type Args struct {
// All lists of all arguments in command line (not including the command itself)
All []string
// Completed lists of all completed arguments in command line,
// If the last one is still being typed - no space after it,
// it won't appear in this list of arguments.
Completed []string
// Last argument in command line, the one being typed, if the last
// character in the command line is a space, this argument will be empty,
// otherwise this would be the last word.
Last string
// LastCompleted is the last argument that was fully typed.
// If the last character in the command line is space, this would be the
// last word, otherwise, it would be the word before that.
LastCompleted string
}
// Directory gives the directory of the current written
// last argument if it represents a file name being written.
// in case that it is not, we fall back to the current directory.
func (a Args) Directory() string {
if info, err := os.Stat(a.Last); err == nil && info.IsDir() {
return fixPathForm(a.Last, a.Last)
}
dir := filepath.Dir(a.Last)
if info, err := os.Stat(dir); err != nil || !info.IsDir() {
return "./"
}
return fixPathForm(a.Last, dir)
}
func newArgs(line string) Args {
var (
all []string
completed []string
)
parts := splitFields(line)
if len(parts) > 0 {
all = parts[1:]
completed = removeLast(parts[1:])
}
return Args{
All: all,
Completed: completed,
Last: last(parts),
LastCompleted: last(completed),
}
}
// splitFields returns a list of fields from the given command line.
// If the last character is space, it appends an empty field in the end
// indicating that the field before it was completed.
// If the last field is of the form "a=b", it splits it to two fields: "a", "b",
// So it can be completed.
func splitFields(line string) []string {
parts := strings.Fields(line)
// Add empty field if the last field was completed.
if len(line) > 0 && unicode.IsSpace(rune(line[len(line)-1])) {
parts = append(parts, "")
}
// Treat the last field if it is of the form "a=b"
parts = splitLastEqual(parts)
return parts
}
func splitLastEqual(line []string) []string {
if len(line) == 0 {
return line
}
parts := strings.Split(line[len(line)-1], "=")
return append(line[:len(line)-1], parts...)
}
func (a Args) from(i int) Args {
if i > len(a.All) {
i = len(a.All)
}
a.All = a.All[i:]
if i > len(a.Completed) {
i = len(a.Completed)
}
a.Completed = a.Completed[i:]
return a
}
func removeLast(a []string) []string {
if len(a) > 0 {
return a[:len(a)-1]
}
return a
}
func last(args []string) string {
if len(args) == 0 {
return ""
}
return args[len(args)-1]
}
