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Hilbish/complete.go

328 lines
7.8 KiB

package main
import (
"errors"
"path/filepath"
"strings"
"os"
"hilbish/util"
rt "github.com/arnodel/golua/runtime"
)
var charEscapeMap = []string{
"\"", "\\\"",
"'", "\\'",
"`", "\\`",
" ", "\\ ",
"(", "\\(",
")", "\\)",
"[", "\\[",
"]", "\\]",
"$", "\\$",
"&", "\\&",
"*", "\\*",
">", "\\>",
"<", "\\<",
"|", "\\|",
}
var charEscapeMapInvert = invert(charEscapeMap)
var escapeReplaer = strings.NewReplacer(charEscapeMap...)
var escapeInvertReplaer = strings.NewReplacer(charEscapeMapInvert...)
func invert(m []string) []string {
newM := make([]string, len(charEscapeMap))
for i := range m {
if (i + 1) % 2 == 0 {
newM[i] = m[i - 1]
newM[i - 1] = m[i]
}
}
return newM
}
func splitForFile(str string) []string {
split := []string{}
sb := &strings.Builder{}
quoted := false
for i, r := range str {
if r == '"' {
quoted = !quoted
sb.WriteRune(r)
} else if r == ' ' && str[i - 1] == '\\' {
sb.WriteRune(r)
} else if !quoted && r == ' ' {
split = append(split, sb.String())
sb.Reset()
} else {
sb.WriteRune(r)
}
}
if strings.HasSuffix(str, " ") {
split = append(split, "")
}
if sb.Len() > 0 {
split = append(split, sb.String())
}
return split
}
func fileComplete(query, ctx string, fields []string) ([]string, string) {
q := splitForFile(ctx)
return matchPath(q[len(q) - 1])
}
func binaryComplete(query, ctx string, fields []string) ([]string, string) {
q := splitForFile(ctx)
query = q[len(q) - 1]
var completions []string
prefixes := []string{"./", "../", "/", "~/"}
for _, prefix := range prefixes {
if strings.HasPrefix(query, prefix) {
fileCompletions, filePref := matchPath(query)
if len(fileCompletions) != 0 {
for _, f := range fileCompletions {
fullPath, _ := filepath.Abs(util.ExpandHome(query + strings.TrimPrefix(f, filePref)))
if err := findExecutable(escapeInvertReplaer.Replace(fullPath), false, true); err != nil {
continue
}
completions = append(completions, f)
}
}
return completions, filePref
}
}
// filter out executables, but in path
for _, dir := range filepath.SplitList(os.Getenv("PATH")) {
// search for an executable which matches our query string
if matches, err := filepath.Glob(filepath.Join(dir, query + "*")); err == nil {
// get basename from matches
for _, match := range matches {
// check if we have execute permissions for our match
err := findExecutable(match, true, false)
if err != nil {
continue
}
// get basename from match
name := filepath.Base(match)
// add basename to completions
completions = append(completions, name)
}
}
}
// add lua registered commands to completions
for cmdName := range commands {
if strings.HasPrefix(cmdName, query) {
completions = append(completions, cmdName)
}
}
completions = removeDupes(completions)
return completions, query
}
func matchPath(query string) ([]string, string) {
oldQuery := query
query = strings.TrimPrefix(query, "\"")
var entries []string
var baseName string
query = escapeInvertReplaer.Replace(query)
path, _ := filepath.Abs(util.ExpandHome(filepath.Dir(query)))
if string(query) == "" {
// filepath base below would give us "."
// which would cause a match of only dotfiles
path, _ = filepath.Abs(".")
} else if !strings.HasSuffix(query, string(os.PathSeparator)) {
baseName = filepath.Base(query)
}
files, _ := os.ReadDir(path)
for _, entry := range files {
// should we handle errors here?
file, _ := entry.Info()
fileInfo, err := entry.Info()
if err == nil && fileInfo.Mode() & os.ModeSymlink != 0 {
path, _ := filepath.EvalSymlinks(filepath.Join(path, file.Name()))
file, _ = os.Lstat(path)
}
if strings.HasPrefix(file.Name(), baseName) {
entry := file.Name()
if file.IsDir() {
entry = entry + string(os.PathSeparator)
}
if !strings.HasPrefix(oldQuery, "\"") {
entry = escapeFilename(entry)
}
entries = append(entries, entry)
}
}
if !strings.HasPrefix(oldQuery, "\"") {
baseName = escapeFilename(baseName)
}
return entries, baseName
}
func escapeFilename(fname string) string {
return escapeReplaer.Replace(fname)
}
// #interface completions
// tab completions
// The completions interface deals with tab completions.
func completionLoader(rtm *rt.Runtime) *rt.Table {
exports := map[string]util.LuaExport{
"files": {luaFileComplete, 3, false},
"bins": {luaBinaryComplete, 3, false},
"call": {callLuaCompleter, 4, false},
"handler": {completionHandler, 2, false},
}
mod := rt.NewTable()
util.SetExports(rtm, mod, exports)
return mod
}
// #interface completions
// handler(line, pos)
// The handler function is the callback for tab completion in Hilbish.
// You can check the completions doc for more info.
// --- @param line string
// --- @param pos string
func completionHandler(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
return c.Next(), nil
}
// #interface completions
// call(name, query, ctx, fields)
// Calls a completer function. This is mainly used to call
// a command completer, which will have a `name` in the form
// of `command.name`, example: `command.git`
// --- @param name string
// --- @param query string
// --- @param ctx string
// --- @param fields table
func callLuaCompleter(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if err := c.CheckNArgs(4); err != nil {
return nil, err
}
completer, err := c.StringArg(0)
if err != nil {
return nil, err
}
query, err := c.StringArg(1)
if err != nil {
return nil, err
}
ctx, err := c.StringArg(2)
if err != nil {
return nil, err
}
fields, err := c.TableArg(3)
if err != nil {
return nil, err
}
var completecb *rt.Closure
var ok bool
if completecb, ok = luaCompletions[completer]; !ok {
return nil, errors.New("completer " + completer + " does not exist")
}
// we must keep the holy 80 cols
completerReturn, err := rt.Call1(l.MainThread(),
rt.FunctionValue(completecb), rt.StringValue(query),
rt.StringValue(ctx), rt.TableValue(fields))
if err != nil {
return nil, err
}
return c.PushingNext1(t.Runtime, completerReturn), nil
}
// #interface completions
// files(query, ctx, fields)
// Returns file completion candidates based on the provided query.
// --- @param query string
// --- @param ctx string
// --- @param fields table
func luaFileComplete(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
query, ctx, fds, err := getCompleteParams(t, c)
if err != nil {
return nil, err
}
completions, pfx := fileComplete(query, ctx, fds)
luaComps := rt.NewTable()
for i, comp := range completions {
luaComps.Set(rt.IntValue(int64(i + 1)), rt.StringValue(comp))
}
return c.PushingNext(t.Runtime, rt.TableValue(luaComps), rt.StringValue(pfx)), nil
}
// #interface completions
// bins(query, ctx, fields)
// Returns binary/executale completion candidates based on the provided query.
// --- @param query string
// --- @param ctx string
// --- @param fields table
func luaBinaryComplete(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
query, ctx, fds, err := getCompleteParams(t, c)
if err != nil {
return nil, err
}
completions, pfx := binaryComplete(query, ctx, fds)
luaComps := rt.NewTable()
for i, comp := range completions {
luaComps.Set(rt.IntValue(int64(i + 1)), rt.StringValue(comp))
}
return c.PushingNext(t.Runtime, rt.TableValue(luaComps), rt.StringValue(pfx)), nil
}
func getCompleteParams(t *rt.Thread, c *rt.GoCont) (string, string, []string, error) {
if err := c.CheckNArgs(3); err != nil {
return "", "", []string{}, err
}
query, err := c.StringArg(0)
if err != nil {
return "", "", []string{}, err
}
ctx, err := c.StringArg(1)
if err != nil {
return "", "", []string{}, err
}
fields, err := c.TableArg(2)
if err != nil {
return "", "", []string{}, err
}
var fds []string
util.ForEach(fields, func(k rt.Value, v rt.Value) {
if v.Type() == rt.StringType {
fds = append(fds, v.AsString())
}
})
return query, ctx, fds, err
}