Hilbish/shell.go

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package main
import (
"context"
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"fmt"
"os"
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"strings"
"time"
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// "github.com/bobappleyard/readline"
"github.com/yuin/gopher-lua"
"github.com/yuin/gopher-lua/parse"
"layeh.com/gopher-luar"
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"mvdan.cc/sh/v3/interp"
"mvdan.cc/sh/v3/syntax"
)
func RunInput(input string) {
cmdArgs, cmdString := splitInput(input)
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// If alias was found, use command alias
for aliases[cmdArgs[0]] != "" {
alias := aliases[cmdArgs[0]]
cmdString = alias + strings.TrimPrefix(cmdString, cmdArgs[0])
cmdArgs, cmdString = splitInput(cmdString)
if aliases[cmdArgs[0]] != "" {
continue
}
}
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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)
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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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 {
hooks.Em.Emit("command.exit", 0)
return
}
if commands[cmdArgs[0]] != nil {
err := l.CallByParam(lua.P{
Fn: commands[cmdArgs[0]],
NRet: 1,
Protect: true,
}, luar.New(l, cmdArgs[1:]))
luaexitcode := l.Get(-1)
var exitcode uint8 = 0
l.Pop(1)
if code, ok := luaexitcode.(lua.LNumber); luaexitcode != lua.LNil && ok {
exitcode = uint8(code)
}
if err != nil {
fmt.Fprintln(os.Stderr,
"Error in command:\n\n" + err.Error())
}
hooks.Em.Emit("command.exit", exitcode)
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 {
hooks.Em.Emit("command.exit", code)
} else if err != nil {
fmt.Fprintln(os.Stderr, err)
hooks.Em.Emit("command.exit", 1)
}
break
}
} else {
if code, ok := interp.IsExitStatus(err); ok {
hooks.Em.Emit("command.exit", code)
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} else {
fmt.Fprintln(os.Stderr, err)
}
}
} else {
hooks.Em.Emit("command.exit", 0)
}
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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 {
hc := interp.HandlerCtx(ctx)
_, argstring := splitInput(strings.Join(args, " "))
// If alias was found, use command alias
if aliases[args[0]] != "" {
alias := aliases[args[0]]
argstring = alias + strings.TrimPrefix(argstring, args[0])
args[0] = alias
}
// If command is defined in Lua then run it
if commands[args[0]] != nil {
err := l.CallByParam(lua.P{
Fn: commands[args[0]],
NRet: 1,
Protect: true,
}, luar.New(l, args[1:]))
luaexitcode := l.Get(-1)
var exitcode uint8 = 0
l.Pop(1)
if code, ok := luaexitcode.(lua.LNumber); luaexitcode != lua.LNil && ok {
exitcode = uint8(code)
}
if err != nil {
fmt.Fprintln(os.Stderr,
"Error in command:\n\n" + err.Error())
}
hooks.Em.Emit("command.exit", exitcode)
return interp.NewExitStatus(exitcode)
}
if _, err := interp.LookPathDir(hc.Dir, hc.Env, args[0]); err != nil {
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hooks.Em.Emit("command.not-found", args[0])
return interp.NewExitStatus(127)
}
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return interp.DefaultExecHandler(2 * time.Second)(ctx, args)
}
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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
}
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()
}