Hilbish/main.go

303 lines
6.5 KiB
Go

package main
import (
"bufio"
"context"
"fmt"
"io"
"os"
"strings"
"os/signal"
"os/user"
"path/filepath"
"time"
"hilbish/golibs/bait"
"github.com/pborman/getopt"
"github.com/yuin/gopher-lua"
"layeh.com/gopher-luar"
"mvdan.cc/sh/v3/interp"
"golang.org/x/term"
)
var (
l *lua.LState
lr *LineReader
commands = map[string]*lua.LFunction{}
aliases = map[string]string{}
homedir string
curuser *user.User
hooks bait.Bait
defaultConfPath string
runner *interp.Runner
)
func main() {
homedir, _ = os.UserHomeDir()
curuser, _ = user.Current()
if defaultConfDir == "" {
// we'll add *our* default if its empty (wont be if its changed comptime)
defaultConfPath = filepath.Join(homedir, "/.hilbishrc.lua")
} else {
// else do ~ substitution
defaultConfPath = filepath.Join(strings.Replace(defaultConfDir, "~", homedir, 1), ".hilbishrc.lua")
}
helpflag := getopt.BoolLong("help", 'h', "Prints Hilbish flags")
verflag := getopt.BoolLong("version", 'v', "Prints Hilbish version")
setshflag := getopt.BoolLong("setshellenv", 'S', "Sets $SHELL to Hilbish's executed path")
cmdflag := getopt.StringLong("command", 'c', "", "Executes a command on startup")
configflag := getopt.StringLong("config", 'C', defaultConfPath, "Sets the path to Hilbish's config")
getopt.BoolLong("login", 'l', "Force Hilbish to be a login shell")
getopt.BoolLong("interactive", 'i', "Force Hilbish to be an interactive shell")
getopt.BoolLong("noexec", 'n', "Don't execute and only report Lua syntax errors")
getopt.Parse()
loginshflag := getopt.Lookup('l').Seen()
interactiveflag := getopt.Lookup('i').Seen()
noexecflag := getopt.Lookup('n').Seen()
if *helpflag {
getopt.PrintUsage(os.Stdout)
os.Exit(0)
}
if *cmdflag == "" || interactiveflag {
interactive = true
}
if fileInfo, _ := os.Stdin.Stat(); (fileInfo.Mode() & os.ModeCharDevice) == 0 {
interactive = false
}
if getopt.NArgs() > 0 {
interactive = false
}
if noexecflag {
noexecute = true
}
// first arg, first character
if loginshflag || os.Args[0][0] == '-' {
login = true
}
if *verflag {
fmt.Printf("Hilbish %s\n", version)
os.Exit(0)
}
// Set $SHELL if the user wants to
if *setshflag {
os.Setenv("SHELL", os.Args[0])
}
// If user's config doesn't exixt,
if _, err := os.Stat(defaultConfPath); os.IsNotExist(err) {
// Read default from current directory
// (this is assuming the current dir is Hilbish's git)
input, err := os.ReadFile(".hilbishrc.lua")
if err != nil {
// If it wasnt found, go to the real sample conf
input, err = os.ReadFile(sampleConfPath)
if err != nil {
fmt.Println("could not find .hilbishrc.lua or", sampleConfPath)
return
}
}
// Create it using either default config we found
err = os.WriteFile(defaultConfPath, input, 0644)
if err != nil {
// If that fails, bail
fmt.Println("Error creating config file")
fmt.Println(err)
return
}
}
go HandleSignals()
LuaInit()
RunLogin()
RunConfig(*configflag)
lr = NewLineReader("")
if fileInfo, _ := os.Stdin.Stat(); (fileInfo.Mode() & os.ModeCharDevice) == 0 {
scanner := bufio.NewScanner(bufio.NewReader(os.Stdin))
for scanner.Scan() {
RunInput(scanner.Text())
}
}
if *cmdflag != "" {
RunInput(*cmdflag)
}
if getopt.NArgs() > 0 {
l.SetGlobal("args", luar.New(l, getopt.Args()))
err := l.DoFile(getopt.Arg(0))
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
os.Exit(0)
}
// Execute handler for sh runner
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])
cmdArgs, _ := splitInput(argstring)
args = cmdArgs
}
// 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 {
hooks.Em.Emit("command.not-found", args[0])
return interp.NewExitStatus(127)
}
return interp.DefaultExecHandler(2 * time.Second)(ctx, args)
}
// Setup sh runner outside of input label
runner, _ = interp.New(
interp.StdIO(os.Stdin, os.Stdout, os.Stderr),
interp.ExecHandler(exechandle),
)
input:
for interactive {
running = false
lr.SetPrompt(fmtPrompt())
input, err := lr.Read()
if err == io.EOF {
// Exit if user presses ^D (ctrl + d)
fmt.Println("")
break
}
if err != nil {
// If we get a completely random error, print
fmt.Fprintln(os.Stderr, err)
}
input = strings.TrimSpace(input)
if len(input) == 0 { continue }
if strings.HasSuffix(input, "\\") {
for {
input, err = ContinuePrompt(strings.TrimSuffix(input, "\\"))
if err != nil {
goto input // continue inside nested loop
}
if !strings.HasSuffix(input, "\\") {
break
}
}
}
running = true
HandleHistory(input)
RunInput(input)
termwidth, _, err := term.GetSize(0)
if err != nil {
continue
}
fmt.Printf("\u001b[7m∆\u001b[0m" + strings.Repeat(" ", termwidth - 1) + "\r")
}
}
func ContinuePrompt(prev string) (string, error) {
hooks.Em.Emit("multiline", nil)
lr.SetPrompt(multilinePrompt)
cont, err := lr.Read()
if err != nil {
fmt.Println("")
return "", err
}
cont = strings.TrimSpace(cont)
return prev + strings.TrimSuffix(cont, "\n"), nil
}
// This semi cursed function formats our prompt (obviously)
func fmtPrompt() string {
host, _ := os.Hostname()
cwd, _ := os.Getwd()
cwd = strings.Replace(cwd, curuser.HomeDir, "~", 1)
args := []string{
"d", cwd,
"D", filepath.Base(cwd),
"h", host,
"u", curuser.Username,
}
for i, v := range args {
if i % 2 == 0 {
args[i] = "%" + v
}
}
r := strings.NewReplacer(args...)
nprompt := r.Replace(prompt)
return nprompt
}
// do i even have to say
func HandleSignals() {
c := make(chan os.Signal)
signal.Notify(c, os.Interrupt)
for range c {
if !running {
lr.ClearInput()
}
}
}
func HandleHistory(cmd string) {
lr.AddHistory(cmd)
// TODO: load history again (history shared between sessions like this ye)
}