Hilbish/main.go

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package main
import (
"fmt"
"os"
"os/user"
"syscall"
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"os/signal"
"strings"
"bufio"
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"io"
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hooks "hilbish/golibs/bait"
"github.com/akamensky/argparse"
"github.com/bobappleyard/readline"
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"github.com/yuin/gopher-lua"
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)
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const version = "0.3.0"
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var l *lua.LState
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// User's prompt, this will get set when lua side is initialized
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var prompt string
var multilinePrompt = "> "
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// Map of builtin/custom commands defined in the commander lua module
var commands = map[string]bool{}
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// Command aliases
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var aliases = map[string]string{}
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var bait hooks.Bait
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var homedir string
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func main() {
parser := argparse.NewParser("hilbish", "A shell for lua and flower lovers")
verflag := parser.Flag("v", "version", &argparse.Options{
Required: false,
Help: "Prints Hilbish version",
})
setshflag := parser.Flag("S", "set-shell-env", &argparse.Options{
Required: false,
Help: "Sets $SHELL to Hilbish's executed path",
})
err := parser.Parse(os.Args)
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// If invalid flags or --help/-h,
if err != nil {
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// Print usage
fmt.Print(parser.Usage(err))
os.Exit(0)
}
if *verflag {
fmt.Printf("Hilbish v%s\n", version)
os.Exit(0)
}
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// Set $SHELL if the user wants to
if *setshflag { os.Setenv("SHELL", os.Args[0]) }
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homedir, _ = os.UserHomeDir()
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// If user's config doesn't exixt,
if _, err := os.Stat(homedir + "/.hilbishrc.lua"); os.IsNotExist(err) {
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// 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 "real default"
input, err = os.ReadFile("/usr/share/hilbish/.hilbishrc.lua")
if err != nil {
fmt.Println("could not find .hilbishrc.lua or /usr/share/hilbish/.hilbishrc.lua")
return
}
}
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// Create it using either default config we found
err = os.WriteFile(homedir + "/.hilbishrc.lua", input, 0644)
if err != nil {
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// If that fails, bail
fmt.Println("Error creating config file")
fmt.Println(err)
return
}
}
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HandleSignals()
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LuaInit()
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readline.Completer = readline.FilenameCompleter
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readline.LoadHistory(homedir + "/.hilbish-history")
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for {
input, err := readline.String(fmtPrompt())
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if err == io.EOF {
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// Exit if user presses ^D (ctrl + d)
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fmt.Println("")
break
}
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if err != nil {
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// If we get a completely random error, print
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fmt.Fprintln(os.Stderr, err)
}
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input = strings.TrimSpace(input)
if len(input) == 0 { continue }
if strings.HasSuffix(input, "\\") {
for {
input, err = ContinuePrompt(strings.TrimSuffix(input, "\\"))
if err != nil || !strings.HasSuffix(input, "\\") { break }
}
}
RunInput(input)
}
}
func ContinuePrompt(prev string) (string, error) {
fmt.Print(multilinePrompt)
reader := bufio.NewReader(os.Stdin)
// TODO: use readline here?
cont, err := reader.ReadString('\n')
if err != nil {
fmt.Println("")
return "", err
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}
cont = strings.TrimSpace(cont)
return prev + "\n" + strings.TrimSuffix(cont, "\n"), nil
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}
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// This semi cursed function formats our prompt (obviously)
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func fmtPrompt() string {
user, _ := user.Current()
host, _ := os.Hostname()
cwd, _ := os.Getwd()
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cwd = strings.Replace(cwd, user.HomeDir, "~", 1)
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args := []string{
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"d", cwd,
"h", host,
"u", user.Username,
}
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for i, v := range args {
if i % 2 == 0 {
args[i] = "%" + v
}
}
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r := strings.NewReplacer(args...)
nprompt := r.Replace(prompt)
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return nprompt
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}
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// do i even have to say
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func HandleSignals() {
c := make(chan os.Signal)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
<-c
}()
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}