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Copy pathcompletion.go
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296 lines (244 loc) · 9.34 KB
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package readline
import (
"fmt"
"github.com/reeflective/readline/internal/color"
"github.com/reeflective/readline/internal/completion"
"github.com/reeflective/readline/internal/history"
"github.com/reeflective/readline/internal/keymap"
)
func (rl *Shell) completionCommands() commands {
return map[string]func(){
"complete": rl.completeWord,
"possible-completions": rl.possibleCompletions,
"insert-completions": rl.insertCompletions,
"menu-complete": rl.menuComplete,
"menu-complete-backward": rl.menuCompleteBackward,
"delete-char-or-list": rl.deleteCharOrList,
"menu-complete-next-tag": rl.menuCompleteNextTag,
"menu-complete-prev-tag": rl.menuCompletePrevTag,
"accept-and-menu-complete": rl.acceptAndMenuComplete,
"vi-registers-complete": rl.viRegistersComplete,
"menu-incremental-search": rl.menuIncrementalSearch,
}
}
//
// Commands ---------------------------------------------------------------------------
//
// Attempt completion on the current word.
// Currently identitical to menu-complete.
func (rl *Shell) completeWord() {
rl.History.SkipSave()
// This completion function should attempt to insert the first
// valid completion found, without printing the actual list.
if !rl.completer.IsActive() {
rl.startMenuComplete(rl.commandCompletion)
if rl.Config.GetBool("menu-complete-display-prefix") {
// Insert the prefix shared by all candidates, then display the
// menu without selecting one (GNU menu-complete-display-prefix).
rl.completer.InsertCommonPrefix()
return
}
}
rl.completer.Select(1, 0)
rl.completer.SkipDisplay()
}
// List possible completions for the current word.
func (rl *Shell) possibleCompletions() {
rl.History.SkipSave()
rl.startMenuComplete(rl.commandCompletion)
}
// Insert all completions for the current word into the line.
func (rl *Shell) insertCompletions() {
rl.History.Save()
// Generate all possible completions
if !rl.completer.IsActive() {
rl.startMenuComplete(rl.commandCompletion)
}
// Insert each match, cancel insertion with preserving
// the candidate just inserted in the line, for each. The match count is
// invariant here: Select only moves the highlight and Cancel(false,false)
// only restores the line buffer, neither alters the candidate groups.
for range rl.completer.Matches() {
rl.completer.Select(1, 0)
rl.completer.Cancel(false, false)
}
// Clear the completion menu.
rl.completer.Cancel(false, false)
rl.completer.ClearMenu(true)
}
// Like complete-word, except that menu completion is used.
func (rl *Shell) menuComplete() {
rl.History.SkipSave()
// No completions are being printed yet, so simply generate the completions
// as if we just request them without immediately selecting a candidate.
if !rl.completer.IsActive() {
rl.startMenuComplete(rl.commandCompletion)
// Immediately select only if not asked to display first.
if rl.Config.GetBool("menu-complete-display-prefix") {
// Insert the prefix shared by all candidates before displaying.
rl.completer.InsertCommonPrefix()
return
}
}
rl.completer.Select(1, 0)
}
// Deletes the character under the cursor if not at the
// beginning or end of the line (like delete-char).
// If at the end of the line, behaves identically to
// possible-completions.
func (rl *Shell) deleteCharOrList() {
switch {
case rl.cursor.Pos() < rl.line.Len():
rl.line.CutRune(rl.cursor.Pos())
default:
rl.possibleCompletions()
}
}
// Identical to menu-complete, but moves backward through the
// list of possible completions, as if menu-complete had been
// given a negative argument.
func (rl *Shell) menuCompleteBackward() {
rl.History.SkipSave()
// We don't do anything when not already completing.
if !rl.completer.IsActive() {
rl.startMenuComplete(rl.commandCompletion)
}
rl.completer.Select(-1, 0)
}
// In a menu completion, if there are several tags
// of completions, go to the first result of the next tag.
func (rl *Shell) menuCompleteNextTag() {
rl.History.SkipSave()
if !rl.completer.IsActive() {
return
}
rl.completer.SelectTag(true)
}
// In a menu completion, if there are several tags of
// completions, go to the first result of the previous tag.
func (rl *Shell) menuCompletePrevTag() {
rl.History.SkipSave()
if !rl.completer.IsActive() {
return
}
rl.completer.SelectTag(false)
}
// In a menu completion, insert the current completion
// into the buffer, and advance to the next possible completion.
func (rl *Shell) acceptAndMenuComplete() {
rl.History.SkipSave()
// We don't do anything when not already completing.
if !rl.completer.IsActive() {
return
}
// Also return if no candidate
if !rl.completer.IsInserting() {
return
}
// First insert the current candidate.
rl.completer.Cancel(false, false)
// And cycle to the next one.
rl.completer.Select(1, 0)
}
// Open a completion menu (similar to menu-complete) with all currently populated Vim registers.
func (rl *Shell) viRegistersComplete() {
rl.History.SkipSave()
rl.startMenuComplete(rl.Buffers.Complete)
}
// In a menu completion (whether a candidate is selected or not), start incremental-search
// (fuzzy search) on the results. Search backward incrementally for a specified string.
// The search is case-insensitive if the search string does not have uppercase letters
// and no numeric argument was given. The string may begin with ‘^’ to anchor the search
// to the beginning of the line. A restricted set of editing functions is available in the
// mini-buffer. Keys are looked up in the special isearch keymap, On each change in the
// mini-buffer, any currently selected candidate is dropped from the line and the menu.
// An interrupt signal, as defined by the stty setting, will stop the search and go back to the original line.
func (rl *Shell) menuIncrementalSearch() {
rl.History.SkipSave()
// Always regenerate the list of completions.
rl.completer.GenerateWith(rl.commandCompletion)
rl.completer.IsearchStart("completions", false, false)
}
// RefreshCompletions regenerates the currently active completion menu from the
// cached completer and repaints, so completions produced asynchronously (for
// instance by a background producer that updates a cache the completer reads)
// can be shown in place without the user pressing a key.
//
// It is safe to call from any goroutine. If no completion menu is active it is
// a clean no-op. The regeneration runs on the Readline goroutine (rendering
// stays single-writer). If the user has a candidate selected, that selection is
// preserved across the refresh: the same candidate (matched by tag+value) is
// re-selected in the rebuilt menu, or, if it no longer exists in the new
// results, the menu is left active with no selection.
func (rl *Shell) RefreshCompletions() {
rl.completer.RequestRegen()
rl.Keys.RequestRefresh()
}
//
// Utilities --------------------------------------------------------------------------
//
// startMenuComplete generates a completion menu with completions
// generated from a given completer, without selecting a candidate.
func (rl *Shell) startMenuComplete(completer completion.Completer) {
rl.History.SkipSave()
rl.Keymap.SetLocal(keymap.MenuSelect)
rl.completer.GenerateWith(completer)
}
// commandCompletion generates the completions for commands/args/flags.
//
// The application-provided completer is user code that readline calls on nearly
// every keystroke (menu completion and as-you-type autocomplete both funnel
// through here). A panic in it — a bad completer or transient command-tree
// state — is recovered and surfaced as a completion message, so a single faulty
// completion degrades into a visible error instead of crashing the shell.
func (rl *Shell) commandCompletion() (values completion.Values) {
if rl.Completer == nil {
return completion.Values{}
}
defer func() {
if r := recover(); r != nil {
msg := CompleteMessage("completion error: %v", r)
values = msg.convert()
}
}()
line, cursor := rl.completer.Line()
comps := rl.Completer(*line, cursor.Pos())
return comps.convert()
}
// historyCompletion manages the various completion/isearch modes related
// to history control. It can start the history completions, stop them, cycle
// through sources if more than one, and adjust the completion/isearch behavior.
func (rl *Shell) historyCompletion(forward, filterLine, substring bool) {
switch {
case rl.Keymap.Local() == keymap.MenuSelect || rl.Keymap.Local() == keymap.Isearch || rl.completer.AutoCompleting():
// If we are currently completing the last
// history source, cancel history completion.
if rl.History.OnLastSource() {
rl.History.Cycle(true)
rl.completer.ResetForce()
rl.Hint.Reset()
return
}
// Else complete the next history source.
rl.History.Cycle(true)
fallthrough
default:
// Notify if we don't have history sources at all.
if rl.History.Current() == nil {
rl.Hint.SetTemporary(fmt.Sprintf("%s%s%s %s", color.Dim, color.FgRed, "No command history source", color.Reset))
return
}
// Generate the completions with specified behavior.
completer := func() completion.Values {
maxLines := rl.Display.AvailableHelperLines()
return history.Complete(rl.History, forward, filterLine, maxLines, rl.completer.IsearchRegex)
}
if substring {
rl.completer.GenerateWith(completer)
rl.completer.IsearchStart(rl.History.Name(), true, true)
} else {
rl.startMenuComplete(completer)
rl.completer.AutocompleteForce()
}
}
}