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// Package complete provides a tool for bash writing bash completion in go.
//
// Writing bash completion scripts is a hard work. This package provides an easy way
// to create bash completion scripts for any command, and also an easy way to install/uninstall
// the completion of the command.
package complete
import (
"fmt"
"os"
"strings"
"github.com/posener/complete/cmd"
)
const (
envComplete = "COMP_LINE"
envDebug = "COMP_DEBUG"
)
// Run get a command, get the typed arguments from environment
// variable, and print out the complete options
// name is the name of command we want to auto complete.
// IMPORTANT: it must be the same name - if the auto complete
// completes the 'go' command, name must be equal to "go".
func Run(name string, c Command) {
args, ok := getLine()
if !ok {
cmd.Run(name)
return
}
Log("Completing args: %s", args)
options := complete(c, args)
Log("Completion: %s", options)
output(options)
}
// complete get a command an command line arguments and returns
// matching completion options
func complete(c Command, args []string) (matching []string) {
options, _ := c.options(args[:len(args)-1])
// choose only matching options
l := last(args)
for _, option := range options {
if option.Match(l) {
matching = append(matching, option.String())
}
}
return
}
func getLine() ([]string, bool) {
line := os.Getenv(envComplete)
if line == "" {
return nil, false
}
return strings.Split(line, " "), true
}
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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