Hilbish/shell.go

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package main
import (
"fmt"
"os"
"bufio"
"context"
"io"
"strings"
"github.com/bobappleyard/readline"
"github.com/yuin/gopher-lua"
"layeh.com/gopher-luar"
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"mvdan.cc/sh/v3/interp"
"mvdan.cc/sh/v3/syntax"
)
func RunInput(input string) {
// First try to run user input in Lua
err := l.DoString(input)
if err == nil {
// If it succeeds, add to history and prompt again
HandleHistory(input)
bait.Em.Emit("command.exit", 0)
return
}
cmdArgs, cmdString := splitInput(input)
// If alias was found, use command alias
if aliases[cmdArgs[0]] != "" {
cmdString = aliases[cmdArgs[0]] + strings.Trim(cmdString, cmdArgs[0])
}
// If command is defined in Lua then run it
if commands[cmdArgs[0]] {
err := l.CallByParam(lua.P{
Fn: l.GetField(
l.GetTable(
l.GetGlobal("commanding"),
lua.LString("__commands")),
cmdArgs[0]),
NRet: 0,
Protect: true,
}, luar.New(l, cmdArgs[1:]))
if err != nil {
fmt.Fprintln(os.Stderr,
"Error in command:\n\n" + err.Error())
}
if cmdArgs[0] != "exit" { HandleHistory(cmdString) }
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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, "\\"))
if err != nil { break }
err = execCommand(cmdString)
if syntax.IsIncomplete(err) || strings.HasSuffix(input, "\\") {
continue
} else if code, ok := interp.IsExitStatus(err); ok {
bait.Em.Emit("command.exit", code)
} else if err != nil {
fmt.Fprintln(os.Stderr, err)
bait.Em.Emit("command.exit", 1)
}
break
}
} else {
if code, ok := interp.IsExitStatus(err); ok {
bait.Em.Emit("command.exit", code)
} else { fmt.Fprintln(os.Stderr, err) }
}
} else {
bait.Em.Emit("command.exit", 0)
}
HandleHistory(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
}
runner, _ := interp.New(
interp.StdIO(os.Stdin, os.Stdout, os.Stderr),
)
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{}
sb := &strings.Builder{}
cmdstr := &strings.Builder{}
lastcmd := readline.GetHistory(readline.HistorySize() - 1)
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 HandleHistory(cmd string) {
readline.AddHistory(cmd)
readline.SaveHistory(homedir + "/.hilbish-history")
// TODO: load history again (history shared between sessions like this ye)
}
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func StartMultiline(prev string, sb *strings.Builder) bool {
// sb fromt outside is passed so we can
// save input from previous prompts
if sb.String() == "" { sb.WriteString(prev + "\n") }
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fmt.Printf("sh> ")
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reader := bufio.NewReader(os.Stdin)
cont, err := reader.ReadString('\n')
if err == io.EOF {
// Exit when ^D
fmt.Println("")
return true
}
sb.WriteString(cont)
err = execCommand(sb.String())
if err != nil && syntax.IsIncomplete(err) {
return false
}
return true
}