110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
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// Package complete provides a tool for bash writing bash completion in go.
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//
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// Writing bash completion scripts is a hard work. This package provides an easy way
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// to create bash completion scripts for any command, and also an easy way to install/uninstall
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// the completion of the command.
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package complete
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"strconv"
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"github.com/posener/complete/cmd"
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"github.com/posener/complete/match"
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)
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const (
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envLine = "COMP_LINE"
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envPoint = "COMP_POINT"
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envDebug = "COMP_DEBUG"
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)
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// Complete structs define completion for a command with CLI options
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type Complete struct {
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Command Command
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cmd.CLI
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Out io.Writer
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}
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// New creates a new complete command.
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// name is the name of command we want to auto complete.
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// IMPORTANT: it must be the same name - if the auto complete
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// completes the 'go' command, name must be equal to "go".
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// command is the struct of the command completion.
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func New(name string, command Command) *Complete {
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return &Complete{
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Command: command,
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CLI: cmd.CLI{Name: name},
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Out: os.Stdout,
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}
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}
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// Run runs the completion and add installation flags beforehand.
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// The flags are added to the main flag CommandLine variable.
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func (c *Complete) Run() bool {
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c.AddFlags(nil)
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flag.Parse()
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return c.Complete()
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}
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// Complete a command from completion line in environment variable,
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// and print out the complete options.
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// returns success if the completion ran or if the cli matched
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// any of the given flags, false otherwise
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// For installation: it assumes that flags were added and parsed before
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// it was called.
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func (c *Complete) Complete() bool {
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line, point, ok := getEnv()
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if !ok {
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// make sure flags parsed,
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// in case they were not added in the main program
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return c.CLI.Run()
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}
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if point >= 0 && point < len(line) {
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line = line[:point]
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}
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Log("Completing phrase: %s", line)
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a := newArgs(line)
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Log("Completing last field: %s", a.Last)
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options := c.Command.Predict(a)
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Log("Options: %s", options)
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// filter only options that match the last argument
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matches := []string{}
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for _, option := range options {
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if match.Prefix(option, a.Last) {
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matches = append(matches, option)
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}
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}
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Log("Matches: %s", matches)
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c.output(matches)
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return true
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}
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func getEnv() (line string, point int, ok bool) {
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line = os.Getenv(envLine)
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if line == "" {
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return
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}
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point, err := strconv.Atoi(os.Getenv(envPoint))
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if err != nil {
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// If failed parsing point for some reason, set it to point
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// on the end of the line.
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Log("Failed parsing point %s: %v", os.Getenv(envPoint), err)
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point = len(line)
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}
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return line, point, true
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}
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func (c *Complete) output(options []string) {
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// stdout of program defines the complete options
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for _, option := range options {
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fmt.Fprintln(c.Out, option)
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}
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}
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