Hilbish/shell.go

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package main
import (
"context"
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"fmt"
"os"
"path/filepath"
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"strings"
"time"
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"github.com/yuin/gopher-lua"
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//"github.com/yuin/gopher-lua/parse"
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"mvdan.cc/sh/v3/interp"
"mvdan.cc/sh/v3/syntax"
)
func runInput(input string) {
running = true
cmdString := aliases.Resolve(input)
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// If alias was found, use command alias
hooks.Em.Emit("command.preexec", input, cmdString)
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// First try to load input, essentially compiling to bytecode
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fn, err := l.LoadString(cmdString)
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if err != nil && noexecute {
fmt.Println(err)
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/* if lerr, ok := err.(*lua.ApiError); ok {
if perr, ok := lerr.Cause.(*parse.Error); ok {
print(perr.Pos.Line == parse.EOF)
}
}
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*/
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return
}
// And if there's no syntax errors and -n isnt provided, run
if !noexecute {
l.Push(fn)
err = l.PCall(0, lua.MultRet, nil)
}
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if err == nil {
cmdFinish(0, cmdString)
return
}
// Last option: use sh interpreter
err = execCommand(cmdString)
if err != nil {
// If input is incomplete, start multiline prompting
if syntax.IsIncomplete(err) {
for {
cmdString, err = continuePrompt(strings.TrimSuffix(cmdString, "\\"))
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if err != nil {
break
}
err = execCommand(cmdString)
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if syntax.IsIncomplete(err) || strings.HasSuffix(input, "\\") {
continue
} else if code, ok := interp.IsExitStatus(err); ok {
cmdFinish(code, cmdString)
} else if err != nil {
fmt.Fprintln(os.Stderr, err)
cmdFinish(1, cmdString)
}
break
}
} else {
if code, ok := interp.IsExitStatus(err); ok {
cmdFinish(code, cmdString)
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} else {
fmt.Fprintln(os.Stderr, err)
}
}
} else {
cmdFinish(0, cmdString)
}
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}
// Run command in sh interpreter
func execCommand(cmd string) error {
file, err := syntax.NewParser().Parse(strings.NewReader(cmd), "")
if err != nil {
return err
}
exechandle := func(ctx context.Context, args []string) error {
_, argstring := splitInput(strings.Join(args, " "))
// If alias was found, use command alias
argstring = aliases.Resolve(argstring)
args, _ = splitInput(argstring)
// If command is defined in Lua then run it
luacmdArgs := l.NewTable()
for _, str := range args[1:] {
luacmdArgs.Append(lua.LString(str))
}
if commands[args[0]] != nil {
err := l.CallByParam(lua.P{
Fn: commands[args[0]],
NRet: 1,
Protect: true,
}, luacmdArgs)
if err != nil {
fmt.Fprintln(os.Stderr,
"Error in command:\n\n" + err.Error())
return interp.NewExitStatus(1)
}
luaexitcode := l.Get(-1)
var exitcode uint8
l.Pop(1)
if code, ok := luaexitcode.(lua.LNumber); luaexitcode != lua.LNil && ok {
exitcode = uint8(code)
}
cmdFinish(exitcode, argstring)
return interp.NewExitStatus(exitcode)
}
err := lookpath(args[0])
if err == os.ErrPermission {
hooks.Em.Emit("command.no-perm", args[0])
return interp.NewExitStatus(126)
} else if err != nil {
hooks.Em.Emit("command.not-found", args[0])
return interp.NewExitStatus(127)
}
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return interp.DefaultExecHandler(2 * time.Second)(ctx, args)
}
runner, _ := interp.New(
interp.StdIO(os.Stdin, os.Stdout, os.Stderr),
interp.ExecHandler(exechandle),
)
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err = runner.Run(context.TODO(), file)
return err
}
// custom lookpath function so we know if a command is found *and* has execute permission
func lookpath(file string) error {
skip := []string{"./", "/", "../", "~/"}
for _, s := range skip {
if strings.HasPrefix(file, s) {
err := findExecutable(file)
return err
}
}
for _, dir := range filepath.SplitList(os.Getenv("PATH")) {
path := filepath.Join(dir, file)
err := findExecutable(path)
if err == os.ErrPermission {
return err
} else if err == nil {
return nil
}
}
return os.ErrNotExist
}
func findExecutable(name string) error {
f, err := os.Stat(name)
if err != nil {
return err
}
if m := f.Mode(); !m.IsDir() && m & 0111 != 0 {
return nil
}
return os.ErrPermission
}
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func splitInput(input string) ([]string, string) {
// end my suffering
// TODO: refactor this garbage
quoted := false
startlastcmd := false
lastcmddone := false
cmdArgs := []string{}
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sb := &strings.Builder{}
cmdstr := &strings.Builder{}
lastcmd := "" //readline.GetHistory(readline.HistorySize() - 1)
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for _, r := range input {
if r == '"' {
// start quoted input
// this determines if other runes are replaced
quoted = !quoted
// dont add back quotes
//sb.WriteRune(r)
} else if !quoted && r == '~' {
// if not in quotes and ~ is found then make it $HOME
sb.WriteString(os.Getenv("HOME"))
} else if !quoted && r == ' ' {
// if not quoted and there's a space then add to cmdargs
cmdArgs = append(cmdArgs, sb.String())
sb.Reset()
} else if !quoted && r == '^' && startlastcmd && !lastcmddone {
// if ^ is found, isnt in quotes and is
// the second occurence of the character and is
// the first time "^^" has been used
cmdstr.WriteString(lastcmd)
sb.WriteString(lastcmd)
startlastcmd = !startlastcmd
lastcmddone = !lastcmddone
continue
} else if !quoted && r == '^' && !lastcmddone {
// if ^ is found, isnt in quotes and is the
// first time of starting "^^"
startlastcmd = !startlastcmd
continue
} else {
sb.WriteRune(r)
}
cmdstr.WriteRune(r)
}
if sb.Len() > 0 {
cmdArgs = append(cmdArgs, sb.String())
}
return cmdArgs, cmdstr.String()
}
func cmdFinish(code uint8, cmdstr string) {
hooks.Em.Emit("command.exit", code, cmdstr)
}