Hilbish/rl.go

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//go:build !hilbiline
// +build !hilbiline
package main
// Here we define a generic interface for readline and hilbiline,
// making them interchangable during build time
// this is normal readline
import (
"path/filepath"
"strings"
"os"
"github.com/Rosettea/readline"
"github.com/yuin/gopher-lua"
)
type LineReader struct {
Prompt string
}
func NewLineReader(prompt string) *LineReader {
readline.Completer = func(query string, ctx string) []string {
var completions []string
// trim whitespace from ctx
ctx = strings.TrimLeft(ctx, " ")
fields := strings.Split(ctx, " ")
if len(fields) == 0 {
return nil
}
if len(fields) == 1 {
prefixes := []string{"./", "../"}
for _, prefix := range prefixes {
if strings.HasPrefix(query, prefix) {
if matches, err := filepath.Glob(query + "*"); err == nil {
for _, match := range matches {
if info, err := os.Stat(match); err == nil && info.Mode().Perm() & 0100 == 0 {
continue
}
name := filepath.Base(match)
completions = append(completions, name)
}
}
if len(completions) == 1 {
// we have add the base dir of query since the completion entries are basename
// why? so readline will display just that
// and we want to complete the full path when its the only completion entry
// query will be incomplete so adding it will be broken
// also Dir doesn't have a trailing slash so we need to filepath join
// to account to windows
// AND ANOTHER THING is it returns . if the arg is ./ and Join will
// ignore that so we have to check and just add the prefix instead
if prefix != "./" {
completions[0] = filepath.Join(filepath.Dir(query), completions[0])
} else {
completions[0] = prefix + completions[0]
}
}
return completions
}
}
for _, dir := range filepath.SplitList(os.Getenv("PATH")) {
// print dir to stderr for debugging
// 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
if info, err := os.Stat(match); err == nil && info.Mode().Perm() & 0100 == 0 {
continue
}
// get basename from match
name := filepath.Base(match)
// print name to stderr for debugging
// 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)
}
}
} else {
if completecb, ok := luaCompletions["command." + fields[0]]; ok {
err := l.CallByParam(lua.P{
Fn: completecb,
NRet: 1,
Protect: true,
})
if err != nil {
return []string{}
}
luacompleteTable := l.Get(-1)
l.Pop(1)
if cmpTbl, ok := luacompleteTable.(*lua.LTable); ok {
cmpTbl.ForEach(func(key lua.LValue, value lua.LValue) {
// print key and value to stderr for debugging
// if key is a number (index), we just check and complete that
if key.Type() == lua.LTNumber {
// if we have only 2 fields then this is fine
if len(fields) == 2 {
if strings.HasPrefix(value.String(), fields[1]) {
completions = append(completions, value.String())
}
}
} else if key.Type() == lua.LTString {
if len(fields) == 2 {
if strings.HasPrefix(key.String(), fields[1]) {
completions = append(completions, key.String())
}
} else {
// if we have more than 2 fields, we need to check if the key matches
// the current field and if it does, we need to check if the value is a string
// or table (nested sub completions)
if key.String() == fields[1] {
// if value is a table, we need to iterate over it
// and add each value to completions
valueTbl := value.(*lua.LTable)
valueTbl.ForEach(func(key lua.LValue, value lua.LValue) {
val := value.String()
if val == "<file>" {
// complete files
completions = append(completions, readline.FilenameCompleter(query, ctx)...)
} else {
if strings.HasPrefix(val, query) {
completions = append(completions, val)
}
}
})
}
}
}
})
}
}
if len(completions) == 0 {
completions = readline.FilenameCompleter(query, ctx)
}
}
return completions
}
readline.LoadHistory(defaultHistPath)
return &LineReader{
Prompt: prompt,
}
}
func (lr *LineReader) Read() (string, error) {
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hooks.Em.Emit("command.precmd", nil)
return readline.String(lr.Prompt)
}
func (lr *LineReader) SetPrompt(prompt string) {
lr.Prompt = prompt
}
func (lr *LineReader) AddHistory(cmd string) {
readline.AddHistory(cmd)
readline.SaveHistory(defaultHistPath)
}
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func (lr *LineReader) ClearInput() {
readline.ReplaceLine("", 0)
readline.RefreshLine()
}
func (lr *LineReader) Resize() {
readline.Resize()
}