/
main.go
132 lines (120 loc) · 2.56 KB
/
main.go
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package main
import (
"os"
"fmt"
"flag"
"strings"
"github.com/bobappleyard/ts"
"github.com/bobappleyard/readline"
_ "github.com/bobappleyard/ts/ext"
)
const version = "0.3"
var (
ForcePrompt = flag.Bool("p", false, "force a prompt to appear")
Compiling = flag.Bool("c", false, "compile rather than evaluate")
Outfile = flag.String("o", "", "target to compile to")
ViewVersion = flag.Bool("version", false, "print BobScript version")
)
const msg = `usage: bsi [options] script args ...
Specifying no script opens a prompt. Takes multiple script files when -c is set.
Options:`
func usageMsg() {
fmt.Fprintln(os.Stderr, msg)
off := 0
flag.VisitAll(func(f *flag.Flag) {
if off < len(f.Name) {
off = len(f.Name)
}
})
flag.VisitAll(func(f *flag.Flag) {
sep := make([]byte, off - len(f.Name))
for i := range sep {
sep[i] = 0x20
}
fmt.Fprintf(os.Stderr, "-%s %s-- %s\n", f.Name, sep, f.Usage)
})
}
func fatal(err interface{}) {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
func newi(as []string) *ts.Interpreter {
i := ts.New()
args := i.Accessor("args")
i.Import("system").Set(args, ts.Wrap(as))
path := os.Getenv("HOME") + "/.tsirc"
if _, e := os.Stat(path); e == nil {
i.Load(path)
}
readline.LoadHistory(os.Getenv("HOME") + "/.tsihistory")
readline.SetWordBreaks(" \t\n\"\\+-*/><=!:;|&[{()}].")
readline.Completer = func(query, ctx string) []string {
var src, res []string
p := len(ctx)-len(query)-1
if p > 0 && ctx[p] == '.' {
src = i.ListAccessors()
} else {
src = i.ListDefined()
}
for _, x := range src {
if strings.HasPrefix(x, query) {
res = append(res, x)
}
}
return res
}
return i
}
func compile(as []string) {
if len(as) == 0 {
fatal("error: no files provided")
}
u := new(ts.Unit)
for _, x := range as {
f, err := os.Open(x)
if err != nil {
fatal(err)
}
u.Compile(f, x)
f.Close()
}
targ := *Outfile
if targ == "" {
targ = as[0] + "c"
}
f, err := os.Create(targ)
if err != nil {
fatal(err)
}
u.Save(f)
f.Close()
}
func main() {
defer func() {
if err := recover(); err != nil {
fatal(err)
}
}()/**/
flag.Usage = usageMsg
flag.Parse()
as := flag.Args()
switch {
case *ViewVersion:
fmt.Fprintln(os.Stderr, version)
os.Exit(2)
case *Compiling:
i := new(ts.Interpreter)
i.LoadPrimitives()
compile(as)
case len(as) == 0:
i := newi(as)
i.Repl(readline.NewReader, readline.AddHistory)
default:
i := newi(as)
i.Load(as[0])
if *ForcePrompt {
i.Repl(readline.NewReader, readline.AddHistory)
}
}
readline.SaveHistory(os.Getenv("HOME") + "/.tsihistory")
}