Hilbish/shell.go

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2021-04-03 17:13:45 +00:00
package main
import (
"fmt"
"os"
"bufio"
"context"
"io"
"strings"
"github.com/bobappleyard/readline"
"github.com/yuin/gopher-lua"
"layeh.com/gopher-luar"
"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
readline.AddHistory(input)
readline.SaveHistory(homedir + "/.hilbish-history")
bait.Em.Emit("command.exit", nil)
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bait.Em.Emit("command.success", nil)
return
}
// Split up the input
cmdArgs, cmdString := splitInput(input)
// If there's actually no input, prompt again
if len(cmdArgs) == 0 { return }
// If alias was found, use command alias
if aliases[cmdArgs[0]] != "" {
cmdString = aliases[cmdArgs[0]] + strings.Trim(cmdString, cmdArgs[0])
execCommand(cmdString)
return
}
// 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 {
// TODO: dont panic
panic(err)
}
readline.AddHistory(cmdString)
readline.SaveHistory(homedir + "/.hilbish-history")
return
}
// Last option: use sh interpreter
switch cmdArgs[0] {
case "exit":
os.Exit(0)
default:
err := execCommand(cmdString)
if err != nil {
// If input is incomplete, start multiline prompting
if syntax.IsIncomplete(err) {
sb := &strings.Builder{}
for {
done := StartMultiline(cmdString, sb)
if done {
break
}
}
} else {
if code, ok := interp.IsExitStatus(err); ok {
if code > 0 {
bait.Em.Emit("command.exit", nil)
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bait.Em.Emit("command.fail", code)
}
}
fmt.Fprintln(os.Stderr, err)
}
} else {
bait.Em.Emit("command.exit", nil)
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bait.Em.Emit("command.success", nil)
}
}
}
// 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())
}
readline.AddHistory(input)
readline.SaveHistory(homedir + "/.hilbish-history")
return cmdArgs, cmdstr.String()
}
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") }
fmt.Printf("... ")
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
}