forked from elves/elvish
/
main.go
153 lines (130 loc) · 2.74 KB
/
main.go
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// elvish is an experimental Unix shell. It tries to incorporate a powerful
// programming language with an extensible, friendly user interface.
package main
import (
"fmt"
"os"
"os/signal"
"os/user"
"syscall"
"github.com/elves/elvish/edit"
"github.com/elves/elvish/errutil"
"github.com/elves/elvish/eval"
"github.com/elves/elvish/osutil"
"github.com/elves/elvish/parse"
"github.com/elves/elvish/store"
"github.com/elves/elvish/sys"
)
const (
sigchSize = 32
outChanSize = 32
outChanLeader = "▶ "
)
func newEvalerAndStore() (*eval.Evaler, *store.Store) {
dataDir, err := store.EnsureDataDir()
if err != nil {
fmt.Fprintln(os.Stderr, "Warning: cannot create data dir ~/.elvish")
}
var st *store.Store
if err == nil {
st, err = store.NewStore(dataDir)
if err != nil {
fmt.Fprintln(os.Stderr, "Warning: cannot connect to store:", err)
}
}
return eval.NewEvaler(st), st
}
func printError(err error) {
if err == nil {
return
}
if ce, ok := err.(*errutil.ContextualError); ok {
fmt.Fprint(os.Stderr, ce.Pprint())
} else {
eval.PprintError(err)
fmt.Println()
}
}
// TODO(xiaq): Currently only the editor deals with signals.
func interact() {
ev, st := newEvalerAndStore()
datadir, err := store.EnsureDataDir()
printError(err)
if err == nil {
// XXX
err := ev.Source(datadir + "/rc.elv")
if err != nil && !os.IsNotExist(err) {
printError(err)
}
}
cmdNum := 0
username := "???"
user, err := user.Current()
if err == nil {
username = user.Username
}
hostname, err := os.Hostname()
if err != nil {
hostname = "???"
}
rpromptStr := username + "@" + hostname
sigch := make(chan os.Signal, sigchSize)
signal.Notify(sigch)
ed := edit.NewEditor(os.Stdin, sigch, ev, st)
for {
cmdNum++
name := fmt.Sprintf("<tty %d>", cmdNum)
prompt := func() string {
return osutil.Getwd() + "> "
}
rprompt := func() string {
return rpromptStr
}
lr := ed.ReadLine(prompt, rprompt)
// signal.Stop(sigch)
if lr.EOF {
break
} else if lr.Err != nil {
fmt.Println("Editor error:", lr.Err)
fmt.Println("My pid is", os.Getpid())
}
n, err := parse.Parse(name, lr.Line)
printError(err)
if err == nil {
err := ev.Eval(name, lr.Line, n)
printError(err)
}
}
}
func script(fname string) {
ev, _ := newEvalerAndStore()
err := ev.Source(fname)
if err != nil {
printError(err)
os.Exit(1)
}
}
var usage = `Usage:
elvish
elvish <script>
`
func rescue() {
r := recover()
if r != nil {
print(sys.DumpStack())
println("execing recovery shell /bin/sh")
syscall.Exec("/bin/sh", []string{}, os.Environ())
}
}
func main() {
defer rescue()
switch len(os.Args) {
case 1:
interact()
case 2:
script(os.Args[1])
default:
fmt.Fprintf(os.Stderr, usage)
os.Exit(1)
}
}