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completions.go
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completions.go
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package exoskeleton
import (
"strings"
"github.com/square/exoskeleton/pkg/shellcomp"
)
// CompleteCommands is a CompleteFunc that provides completions for command names.
// It is used by commands like 'help' and 'which' which expect their arguments
// to be command names.
func CompleteCommands(e *Entrypoint, args, env []string) ([]string, shellcomp.Directive, error) {
return e.completionsFor(args, env, false)
}
// CompleteFiles is a CompleteFunc that provides completions for files and paths.
func CompleteFiles(e *Entrypoint, args, env []string) ([]string, shellcomp.Directive, error) {
return nil, shellcomp.DirectiveDefault, nil
}
func (e *Entrypoint) completionsFor(args, env []string, completeArgs bool) ([]string, shellcomp.Directive, error) {
if len(args) == 0 {
return nil, shellcomp.DirectiveNoFileComp, nil
}
// The last argument, which is not completely typed by the user,
// should not be part of the list of arguments
toComplete := args[len(args)-1]
trimmedArgs := args[:len(args)-1]
// Find the real command for which completion must be performed
finalCmd, finalCmdArgs, err := e.Identify(trimmedArgs)
if err != nil {
return nil, shellcomp.DirectiveError, err
}
if _, isModule := finalCmd.(Module); !isModule && !completeArgs {
return nil, shellcomp.DirectiveNoFileComp, nil
}
return finalCmd.Complete(e, append(finalCmdArgs, toComplete), env)
}
func completionsForModule(m Module, args []string) ([]string, shellcomp.Directive, error) {
cmds, err := m.Subcommands()
if err != nil {
return nil, shellcomp.DirectiveError, err
}
return cmds.completionsFor(args)
}
func (c Commands) completionsFor(args []string) ([]string, shellcomp.Directive, error) {
var completions []string
if len(args) > 0 {
toComplete := args[0]
var name string
seen := make(map[string]bool)
for _, subcmd := range c {
name = subcmd.Name()
if seen[name] {
continue
}
seen[name] = true
if strings.HasPrefix(name, toComplete) {
completions = append(completions, name)
}
}
}
return completions, shellcomp.DirectiveNoFileComp, nil
}