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package complete
import (
"fmt"
"os"
"strings"
)
const (
envComplete = "COMP_LINE"
envDebug = "COMP_DEBUG"
)
type Completer struct {
Command
}
func New(c Command) *Completer {
return &Completer{Command: c}
}
func (c *Completer) Complete() {
args := getLine()
Log("Completing args: %s", args)
options := c.complete(args)
Log("Completion: %s", options)
output(options)
}
func (c *Completer) complete(args []string) []string {
all, _ := c.options(args[:len(args)-1])
return c.chooseRelevant(last(args), all)
}
func (c *Completer) chooseRelevant(last string, options []Option) (relevant []string) {
for _, option := range options {
if option.Matches(last) {
relevant = append(relevant, option.String())
}
}
return
}
func getLine() []string {
line := os.Getenv(envComplete)
if line == "" {
panic("should be run as a complete script")
}
return strings.Split(line, " ")
}
func last(args []string) (last string) {
if len(args) > 0 {
last = args[len(args)-1]
}
return
}
func output(options []string) {
// stdout of program defines the complete options
for _, option := range options {
fmt.Println(option)
}
}
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