//GShell/0.0.7 by SatoxITS
// gsh - Go lang based Shell
// (c) 2020 ITS more Co., Ltd.
// 2020-0807 created by SatoxITS (sato@its-more.jp)
//
package main // gsh main
// Documents: https://golang.org/pkg/
import (
"bufio"
"strings"
"strconv"
"sort"
"fmt"
"os"
"time"
"syscall"
"go/types"
"go/token"
"net"
"net/http" // http
//"html" // html
"io/ioutil"
"path/filepath" // for wildcard Match()
)
var VERSION = "gsh/0.0.7 (2020-0812b)"
var LINESIZE = (8*1024)
var PATHSEP = ":" // should be ";" in Windows
var DIRSEP = "/" // canbe \ in Windows
var PROMPT = "> "
var GSH_HOME = ".gsh" // under home directory
type GCommandHistory struct {
StartAt time.Time // command line execution started at
EndAt time.Time // command line execution ended at
ResCode int // exit code of (external command)
CmdError error // error string
OutData *os.File // output of the command
Rusagev [2]syscall.Rusage // Resource consumption, CPU time or so
CmdId int // maybe with identified with arguments or impact
// redireciton commands should not be the CmdId
WorkDir string // working directory at start
CmdLine string // command line
}
type GChdirHistory struct {
Dir string
MovedAt time.Time
}
type CmdMode struct {
BackGround bool
}
type GshContext struct {
StartDir string // the current directory at the start
GetLine string // gsh-getline command as a input line editor
ChdirHistory []GChdirHistory // the 1st entry is wd at the start
gshPA syscall.ProcAttr
CommandHistory []GCommandHistory
CmdCurrent GCommandHistory
BackGround bool
BackGroundJobs []int
LastRusage syscall.Rusage
GshHomeDir string
TerminalId int
CmdTrace bool
}
func isin(what string, list []string) bool {
for _, v := range list {
if v == what {
return true
}
}
return false
}
func env(opts []string) {
env := os.Environ()
if isin("-s", opts){
sort.Slice(env, func(i,j int) bool {
return env[i] < env[j]
})
}
for _, v := range env {
fmt.Printf("%v\n",v)
}
}
func strsubst(str string) string {
rstr := ""
inEsc := 0 // escape characer mode
for _, ch := range str {
if inEsc == 0 {
if ch == '\\' {
inEsc = '\\'
continue
}
if ch == '%' {
inEsc = '%'
continue
}
}
if inEsc == '\\' {
if ch == 's' { ch = ' ' }
if ch == 'r' { ch = '\r' }
if ch == 'n' { ch = '\n' }
if ch == 't' { ch = '\t' }
if ch == '\\' { ch = '\\' }
inEsc = 0
}
if inEsc == '%' {
if ch == '%' { ch = '%' }
if ch == 'T' {
rstr = rstr + time.Now().Format(time.Stamp)
continue;
}
inEsc = 0
}
rstr = rstr + string(ch)
}
return rstr
}
func showFileInfo(path string, opts []string) {
if isin("-ls",opts) {
fi, _ := os.Stat(path)
mod := fi.ModTime()
date := mod.Format(time.Stamp)
fmt.Printf("%v %8v %s ",fi.Mode(),fi.Size(),date)
}
fmt.Printf("%s",path)
if ! isin("-n",opts) {
fmt.Printf("\n")
}
}
func toFullpath(path string) (fullpath string) {
pathv := strings.Split(path,DIRSEP)
if pathv[0] == "." {
pathv[0], _ = os.Getwd()
}else
if pathv[0] == ".." {
cwd, _ := os.Getwd()
ppathv := strings.Split(cwd,DIRSEP)
pathv[0] = strings.Join(ppathv,DIRSEP)
}else
if pathv[0] == "~" {
pathv[0],_ = os.UserHomeDir()
}
return strings.Join(pathv,DIRSEP)
}
func showMatchFile(filev []os.FileInfo, npat,dir string, argv[]string)(string,bool){
fname := ""
found := false
for _,v := range filev {
match, _ := filepath.Match(npat,(v.Name()))
if match {
fname = v.Name()
found = true
//fmt.Printf("[%d] %s\n",i,v.Name())
showIfExecutable(fname,dir,argv)
}
}
return fname,found
}
func showIfExecutable(name,dir string,argv[]string)(ffullpath string,ffound bool){
fullpath := dir + DIRSEP + name
fi, err := os.Stat(fullpath)
if err != nil {
fullpath = dir + DIRSEP + name + ".go"
fi, err = os.Stat(fullpath)
}
if err == nil {
fm := fi.Mode()
if fm.IsRegular() {
ffullpath = fullpath
ffound = true
if ! isin("-s", argv) {
showFileInfo(fullpath,argv)
}
}
}
return ffullpath, ffound
}
func which(list string, argv []string) (fullpathv []string, itis bool){
if len(argv) <= 1 {
fmt.Printf("Usage: which comand [-s] [-a] [-ls]\n")
return []string{""}, false
}
path := argv[1]
if path[0] == '/' {
// should check if excecutable?
return []string{path}, true
}
pathenv, efound := os.LookupEnv(list)
if ! efound {
fmt.Printf("--E-- which: no \"%s\" environment\n",list)
return []string{""}, false
}
showall := isin("-a",argv) || 0 <= strings.Index(path,"*")
dirv := strings.Split(pathenv,PATHSEP)
ffound := false
ffullpath := path
for _, dir := range dirv {
if 0 <= strings.Index(path,"*") { // by wild-card
list,_ := ioutil.ReadDir(dir)
ffullpath, ffound = showMatchFile(list,path,dir,argv)
}else{
ffullpath, ffound = showIfExecutable(path,dir,argv)
}
//if ffound && !isin("-a", argv) {
if ffound && !showall {
break;
}
}
return []string{ffullpath}, ffound
}
func find(argv []string){
}
func eval(argv []string, nlend bool){
var ai = 1
pfmt := "%s"
if argv[ai][0:1] == "%" {
pfmt = argv[ai]
ai = 2
}
if len(argv) <= ai {
return
}
gocode := strings.Join(argv[ai:]," ");
fset := token.NewFileSet()
rval, _ := types.Eval(fset,nil,token.NoPos,gocode)
fmt.Printf(pfmt,rval.Value)
if nlend { fmt.Printf("\n") }
}
func getval(name string) (found bool, val int) {
/* should expand the name here */
if name == "gsh.pid" {
return true, os.Getpid()
}else
if name == "gsh.ppid" {
return true, os.Getppid()
}
return false, 0
}
func echo(argv []string, nlend bool){
for ai := 1; ai < len(argv); ai++ {
if 1 < ai {
fmt.Printf(" ");
}
arg := argv[ai]
found, val := getval(arg)
if found {
fmt.Printf("%d",val)
}else{
fmt.Printf("%s",arg)
}
}
if nlend {
fmt.Printf("\n");
}
}
func resfile() string {
return "gsh.tmp"
}
//var resF *File
func resmap() {
//_ , err := os.OpenFile(resfile(), os.O_RDWR|os.O_CREATE, os.ModeAppend)
// https://developpaper.com/solution-to-golang-bad-file-descriptor-problem/
_ , err := os.OpenFile(resfile(), os.O_RDWR|os.O_CREATE, 0600)
if err != nil {
fmt.Printf("refF could not open: %s\n",err)
}else{
fmt.Printf("refF opened\n")
}
}
func excommand(gshCtx GshContext, exec bool, argv []string) (GshContext, bool) {
if gshCtx.CmdTrace { fmt.Printf("--I-- excommand[%v](%v)\n",exec,argv) }
gshPA := gshCtx.gshPA
fullpathv, itis := which("PATH",[]string{"which",argv[0],"-s"})
if itis == false {
return gshCtx, true
}
fullpath := fullpathv[0]
if 0 < strings.Index(fullpath,".go") {
nargv := argv // []string{}
gofullpathv, itis := which("PATH",[]string{"which","go","-s"})
if itis == false {
fmt.Printf("--F-- Go not found\n")
return gshCtx, true
}
gofullpath := gofullpathv[0]
nargv = []string{ gofullpath, "run", fullpath }
fmt.Printf("--I-- %s {%s %s %s}\n",gofullpath,
nargv[0],nargv[1],nargv[2])
if exec {
syscall.Exec(gofullpath,nargv,os.Environ())
}else{
pid, _ := syscall.ForkExec(gofullpath,nargv,&gshPA)
if gshCtx.BackGround {
fmt.Printf("--I-- in Background [%d]\n",pid)
gshCtx.BackGroundJobs = append(gshCtx.BackGroundJobs,pid)
}else{
rusage := syscall.Rusage {}
syscall.Wait4(pid,nil,0,&rusage)
gshCtx.LastRusage = rusage
gshCtx.CmdCurrent.Rusagev[1] = rusage
}
}
}else{
if exec {
syscall.Exec(fullpath,argv,os.Environ())
}else{
pid, _ := syscall.ForkExec(fullpath,argv,&gshPA)
//fmt.Printf("[%d]\n",pid); // '&' to be background
if gshCtx.BackGround {
fmt.Printf("--I-- in Background [%d]\n",pid)
gshCtx.BackGroundJobs = append(gshCtx.BackGroundJobs,pid)
}else{
rusage := syscall.Rusage {}
syscall.Wait4(pid,nil,0,&rusage);
gshCtx.LastRusage = rusage
gshCtx.CmdCurrent.Rusagev[1] = rusage
}
}
}
return gshCtx, false
}
func sleep(gshCtx GshContext, argv []string) {
if len(argv) < 2 {
fmt.Printf("Sleep 100ms, 100us, 100ns, ...\n")
return
}
duration := argv[1];
d, err := time.ParseDuration(duration)
if err != nil {
d, err = time.ParseDuration(duration+"s")
if err != nil {
fmt.Printf("duration ? %s (%s)\n",duration,err)
return
}
}
//fmt.Printf("Sleep %v\n",duration)
time.Sleep(d)
if 0 < len(argv[2:]) {
gshellv(gshCtx, argv[2:])
}
}
func repeat(gshCtx GshContext, argv []string) {
if len(argv) < 2 {
return
}
start0 := time.Now()
for ri,_ := strconv.Atoi(argv[1]); 0 < ri; ri-- {
if 0 < len(argv[2:]) {
//start := time.Now()
gshellv(gshCtx, argv[2:])
end := time.Now()
elps := end.Sub(start0);
if( 1000000000 < elps ){
fmt.Printf("(repeat#%d %v)\n",ri,elps);
}
}
}
}
func gen(gshCtx GshContext, argv []string) {
gshPA := gshCtx.gshPA
if len(argv) < 2 {
fmt.Printf("Usage: %s N\n",argv[0])
return
}
// should br repeated by "repeat" command
count, _ := strconv.Atoi(argv[1])
fd := gshPA.Files[1] // Stdout
file := os.NewFile(fd,"internalStdOut")
fmt.Printf("--I-- Gen. Count=%d to [%d]\n",count,file.Fd())
//buf := []byte{}
outdata := "0123 5678 0123 5678 0123 5678 0123 5678\r"
for gi := 0; gi < count; gi++ {
file.WriteString(outdata)
}
//file.WriteString("\n")
fmt.Printf("\n(%d B)\n",count*len(outdata));
//file.Close()
}
// -s, -si, -so // bi-directional, source, sync (maybe socket)
func sconnect(gshCtx GshContext, inTCP bool, argv []string) {
gshPA := gshCtx.gshPA
if len(argv) < 2 {
fmt.Printf("Usage: -s [host]:[port[.udp]]\n")
return
}
remote := argv[1]
if remote == ":" { remote = "0.0.0.0:9999" }
if inTCP { // TCP
dport, err := net.ResolveTCPAddr("tcp",remote);
if err != nil {
fmt.Printf("Address error: %s (%s)\n",remote,err)
return
}
conn, err := net.DialTCP("tcp",nil,dport)
if err != nil {
fmt.Printf("Connection error: %s (%s)\n",remote,err)
return
}
file, _ := conn.File();
fd := file.Fd()
fmt.Printf("Socket: connected to %s, socket[%d]\n",remote,fd)
savfd := gshPA.Files[1]
gshPA.Files[1] = fd;
gshellv(gshCtx, argv[2:])
gshPA.Files[1] = savfd
file.Close()
conn.Close()
}else{
//dport, err := net.ResolveUDPAddr("udp4",remote);
dport, err := net.ResolveUDPAddr("udp",remote);
if err != nil {
fmt.Printf("Address error: %s (%s)\n",remote,err)
return
}
//conn, err := net.DialUDP("udp4",nil,dport)
conn, err := net.DialUDP("udp",nil,dport)
if err != nil {
fmt.Printf("Connection error: %s (%s)\n",remote,err)
return
}
file, _ := conn.File();
fd := file.Fd()
ar := conn.RemoteAddr()
//al := conn.LocalAddr()
fmt.Printf("Socket: connected to %s [%s], socket[%d]\n",
remote,ar.String(),fd)
savfd := gshPA.Files[1]
gshPA.Files[1] = fd;
gshellv(gshCtx, argv[2:])
gshPA.Files[1] = savfd
file.Close()
conn.Close()
}
}
func saccept(gshCtx GshContext, inTCP bool, argv []string) {
gshPA := gshCtx.gshPA
if len(argv) < 2 {
fmt.Printf("Usage: -ac [host]:[port[.udp]]\n")
return
}
local := argv[1]
if local == ":" { local = "0.0.0.0:9999" }
if inTCP { // TCP
port, err := net.ResolveTCPAddr("tcp",local);
if err != nil {
fmt.Printf("Address error: %s (%s)\n",local,err)
return
}
//fmt.Printf("Listen at %s...\n",local);
sconn, err := net.ListenTCP("tcp", port)
if err != nil {
fmt.Printf("Listen error: %s (%s)\n",local,err)
return
}
//fmt.Printf("Accepting at %s...\n",local);
aconn, err := sconn.AcceptTCP()
if err != nil {
fmt.Printf("Accept error: %s (%s)\n",local,err)
return
}
file, _ := aconn.File()
fd := file.Fd()
fmt.Printf("Accepted TCP at %s [%d]\n",local,fd)
savfd := gshPA.Files[0]
gshPA.Files[0] = fd;
gshellv(gshCtx, argv[2:])
gshPA.Files[0] = savfd
sconn.Close();
aconn.Close();
file.Close();
}else{
//port, err := net.ResolveUDPAddr("udp4",local);
port, err := net.ResolveUDPAddr("udp",local);
if err != nil {
fmt.Printf("Address error: %s (%s)\n",local,err)
return
}
fmt.Printf("Listen UDP at %s...\n",local);
//uconn, err := net.ListenUDP("udp4", port)
uconn, err := net.ListenUDP("udp", port)
if err != nil {
fmt.Printf("Listen error: %s (%s)\n",local,err)
return
}
file, _ := uconn.File()
fd := file.Fd()
ar := uconn.RemoteAddr()
remote := ""
if ar != nil { remote = ar.String() }
if remote == "" { remote = "?" }
// not yet received
//fmt.Printf("Accepted at %s [%d] <- %s\n",local,fd,"")
savfd := gshPA.Files[0]
gshPA.Files[0] = fd;
savenv := gshPA.Env
gshPA.Env = append(savenv, "REMOTE_HOST="+remote)
gshellv(gshCtx, argv[2:])
gshPA.Env = savenv
gshPA.Files[0] = savfd
uconn.Close();
file.Close();
}
}
// empty line command
func xPwd(gshCtx GshContext, argv[]string){
// execute context command, pwd + date
// context notation, representation scheme, to be resumed at re-login
cwd, _ := os.Getwd()
if isin("-a",argv){
// show directory history
}
if isin("-v",argv) {
t := time.Now()
date := t.Format(time.UnixDate)
exe, _ := os.Executable()
host, _ := os.Hostname()
fmt.Printf("{PWD=\"%s\"",cwd)
fmt.Printf(" HOST=\"%s\"",host)
fmt.Printf(" DATE=\"%s\"",date)
fmt.Printf(" TIME=\"%s\"",t.String())
fmt.Printf(" PID=\"%d\"",os.Getpid())
fmt.Printf(" EXE=\"%s\"",exe)
fmt.Printf("}\n")
}else
if isin("-ls",argv){
showFileInfo(cwd,argv)
}else{
fmt.Printf("%s\n",cwd)
}
}
// these should be browsed and edited by HTTP browser
// show the time of command with -t and direcotry with -ls
// openfile-history, sort by -a -m -c
// sort by elapsed time by -t -s
// search by "more" like interface
// edit history
// sort history, and wc or uniq
// CPU and other resource consumptions
// limit showing range (by time or so)
// export / import history
func xHistory(gshCtx GshContext, argv []string) (rgshCtx GshContext) {
for i, v := range gshCtx.CommandHistory {
// exclude commands not to be listed by default
// internal commands may be suppressed by default
if v.CmdLine == "" && !isin("-a",argv) {
continue;
}
if !isin("-n",argv){ // like "fc"
fmt.Printf("!%-3d ",i)
}
if isin("-v",argv){
fmt.Println(v) // should be with it date
}else{
if isin("-l",argv) || isin("-l0",argv) {
elps := v.EndAt.Sub(v.StartAt);
start := v.StartAt.Format(time.Stamp)
fmt.Printf("%s %11v/t ",start,elps)
}
if isin("-l",argv) && !isin("-l0",argv){
fmt.Printf("%v",Rusagef("%t %u %s",argv,v.Rusagev))
}
if isin("-ls",argv){
fmt.Printf("@%s ",v.WorkDir)
// show the FileInfo of the output command??
}
fmt.Printf("%s",v.CmdLine)
fmt.Printf("\n")
}
}
return gshCtx
}
// !n - history index
func searchHistory(gshCtx GshContext, gline string) (string, bool, bool){
if gline[0] == '!' {
hix, err := strconv.Atoi(gline[1:])
if err != nil {
fmt.Printf("--E-- (%s : range)\n",hix)
return "", false, true
}
if hix < 0 || len(gshCtx.CommandHistory) <= hix {
fmt.Printf("--E-- (%d : out of range)\n",hix)
return "", false, true
}
return gshCtx.CommandHistory[hix].CmdLine, false, false
}
// search
//for i, v := range gshCtx.CommandHistory {
//}
return gline, false, false
}
// temporary adding to PATH environment
// cd name -lib for LD_LIBRARY_PATH
// chdir with directory history (date + full-path)
// -s for sort option (by visit date or so)
func xChdirHistory(gshCtx GshContext, argv []string){
for i, v := range gshCtx.ChdirHistory {
fmt.Printf("!%d ",i)
fmt.Printf("%v ",v.MovedAt.Format(time.Stamp))
showFileInfo(v.Dir,argv)
}
}
func xChdir(gshCtx GshContext, argv []string) (rgshCtx GshContext) {
cdhist := gshCtx.ChdirHistory
if isin("?",argv ) || isin("-t",argv) {
xChdirHistory(gshCtx,argv)
return gshCtx
}
pwd, _ := os.Getwd()
dir := ""
if len(argv) <= 1 {
dir = toFullpath("~")
}else{
dir = argv[1]
}
if dir[0] == '!' {
if dir == "!0" {
dir = gshCtx.StartDir
}else
if dir == "!!" {
index := len(cdhist) - 1
if 0 < index { index -= 1 }
dir = cdhist[index].Dir
}else{
index, err := strconv.Atoi(dir[1:])
if err != nil {
fmt.Printf("--E-- xChdir(%v)\n",err)
dir = "?"
}else
if len(gshCtx.ChdirHistory) <= index {
fmt.Printf("--E-- xChdir(history range error)\n")
dir = "?"
}else{
dir = cdhist[index].Dir
}
}
}
if dir != "?" {
err := os.Chdir(dir)
if err != nil {
fmt.Printf("--E-- xChdir(%s)(%v)\n",argv[1],err)
}else{
cwd, _ := os.Getwd()
if cwd != pwd {
hist1 := GChdirHistory { }
hist1.Dir = cwd
hist1.MovedAt = time.Now()
gshCtx.ChdirHistory = append(cdhist,hist1)
}
}
}
if isin("-ls",argv){
cwd, _ := os.Getwd()
showFileInfo(cwd,argv);
}
return gshCtx
}
func TimeValSub(tv1 *syscall.Timeval, tv2 *syscall.Timeval){
*tv1 = syscall.NsecToTimeval(tv1.Nano() - tv2.Nano())
}
func RusageSubv(ru1, ru2 [2]syscall.Rusage)([2]syscall.Rusage){
TimeValSub(&ru1[0].Utime,&ru2[0].Utime)
TimeValSub(&ru1[0].Stime,&ru2[0].Stime)
TimeValSub(&ru1[1].Utime,&ru2[1].Utime)
TimeValSub(&ru1[1].Stime,&ru2[1].Stime)
return ru1
}
func TimeValAdd(tv1 syscall.Timeval, tv2 syscall.Timeval)(syscall.Timeval){
tvs := syscall.NsecToTimeval(tv1.Nano() + tv2.Nano())
return tvs
}
/*
func RusageAddv(ru1, ru2 [2]syscall.Rusage)([2]syscall.Rusage){
TimeValAdd(ru1[0].Utime,ru2[0].Utime)
TimeValAdd(ru1[0].Stime,ru2[0].Stime)
TimeValAdd(ru1[1].Utime,ru2[1].Utime)
TimeValAdd(ru1[1].Stime,ru2[1].Stime)
return ru1
}
*/
func Rusagef(fmtspec string, argv []string, ru [2]syscall.Rusage)(string){
ut := TimeValAdd(ru[0].Utime,ru[1].Utime)
st := TimeValAdd(ru[0].Stime,ru[1].Stime)
fmt.Printf("%d.%06ds/u ",ut.Sec,ut.Usec) //ru[1].Utime.Sec,ru[1].Utime.Usec)
fmt.Printf("%d.%06ds/s ",st.Sec,st.Usec) //ru[1].Stime.Sec,ru[1].Stime.Usec)
return ""
}
func Getrusagev()([2]syscall.Rusage){
var ruv = [2]syscall.Rusage{}
syscall.Getrusage(syscall.RUSAGE_SELF,&ruv[0])
syscall.Getrusage(syscall.RUSAGE_CHILDREN,&ruv[1])
return ruv
}
func showRusage(what string,argv []string, ru *syscall.Rusage){
fmt.Printf("%s: ",what);
fmt.Printf("Usr=%d.%06ds",ru.Utime.Sec,ru.Utime.Usec)
fmt.Printf(" Sys=%d.%06ds",ru.Stime.Sec,ru.Stime.Usec)
fmt.Printf(" Rss=%vB",ru.Maxrss)
if isin("-l",argv) {
fmt.Printf(" MinFlt=%v",ru.Minflt)
fmt.Printf(" MajFlt=%v",ru.Majflt)
fmt.Printf(" IxRSS=%vB",ru.Ixrss)
fmt.Printf(" IdRSS=%vB",ru.Idrss)
fmt.Printf(" Nswap=%vB",ru.Nswap)
fmt.Printf(" Read=%v",ru.Inblock)
fmt.Printf(" Write=%v",ru.Oublock)
}
fmt.Printf(" Snd=%v",ru.Msgsnd)
fmt.Printf(" Rcv=%v",ru.Msgrcv)
//if isin("-l",argv) {
fmt.Printf(" Sig=%v",ru.Nsignals)
//}
fmt.Printf("\n");
}
func xTime(gshCtx GshContext, argv[]string)(GshContext,bool){
if 2 <= len(argv){
gshCtx.LastRusage = syscall.Rusage{}
rusagev1 := Getrusagev()
xgshCtx, fin := gshellv(gshCtx,argv[1:])
rusagev2 := Getrusagev()
gshCtx = xgshCtx
showRusage(argv[1],argv,&gshCtx.LastRusage)
rusagev := RusageSubv(rusagev2,rusagev1)
showRusage("self",argv,&rusagev[0])
showRusage("chld",argv,&rusagev[1])
return gshCtx, fin
}else{
rusage:= syscall.Rusage {}
syscall.Getrusage(syscall.RUSAGE_SELF,&rusage)
showRusage("self",argv, &rusage)
syscall.Getrusage(syscall.RUSAGE_CHILDREN,&rusage)
showRusage("chld",argv, &rusage)
return gshCtx, false
}
}
func xJobs(gshCtx GshContext, argv[]string){
fmt.Printf("%d Jobs\n",len(gshCtx.BackGroundJobs))
for ji, pid := range gshCtx.BackGroundJobs {
//wstat := syscall.WaitStatus {0}
rusage := syscall.Rusage {}
//wpid, err := syscall.Wait4(pid,&wstat,syscall.WNOHANG,&rusage);
wpid, err := syscall.Wait4(pid,nil,syscall.WNOHANG,&rusage);
if err != nil {
fmt.Printf("--E-- %%%d [%d] (%v)\n",ji,pid,err)
}else{
fmt.Printf("%%%d[%d](%d)\n",ji,pid,wpid)
showRusage("chld",argv,&rusage)
}
}
}
func inBackground(gshCtx GshContext, argv[]string)(GshContext,bool){
if gshCtx.CmdTrace { fmt.Printf("--I-- inBackground(%v)\n",argv) }
gshCtx.BackGround = true // set background option
xfin := false
gshCtx, xfin = gshellv(gshCtx,argv)
gshCtx.BackGround = false
return gshCtx,xfin
}
// -o file without command means just opening it and refer by #N
// should be listed by "files" comnmand
func xOpen(gshCtx GshContext, argv[]string)(GshContext){
var pv = []int{-1,-1}
err := syscall.Pipe(pv)
fmt.Printf("--I-- pipe()=[#%d,#%d](%v)\n",pv[0],pv[1],err)
return gshCtx
}
func fromPipe(gshCtx GshContext, argv[]string)(GshContext){
return gshCtx
}
func xClose(gshCtx GshContext, argv[]string)(GshContext){
return gshCtx
}
func redirect(gshCtx GshContext, argv[]string)(GshContext,bool){
if len(argv) < 2 {
return gshCtx, false
}
cmd := argv[0]
fname := argv[1]
var file *os.File = nil
fdix := 0
mode := os.O_RDONLY
switch {
case cmd == "-i" || cmd == "<":
fdix = 0
mode = os.O_RDONLY
case cmd == "-o" || cmd == ">":
fdix = 1
mode = os.O_RDWR | os.O_CREATE
case cmd == "-a" || cmd == ">>":
fdix = 1
mode = os.O_RDWR | os.O_CREATE | os.O_APPEND
}
if fname[0] == '#' {
fd, err := strconv.Atoi(fname[1:])
if err != nil {
fmt.Printf("--E-- (%v)\n",err)
return gshCtx, false
}
file = os.NewFile(uintptr(fd),"MaybePipe")
}else{
xfile, err := os.OpenFile(argv[1], mode, 0600)
if err != nil {
fmt.Printf("--E-- (%s)\n",err)
return gshCtx, false
}
file = xfile
}
gshPA := gshCtx.gshPA
savfd := gshPA.Files[fdix]
gshPA.Files[fdix] = file.Fd()
fmt.Printf("--I-- Opened [%d] %s\n",file.Fd(),argv[1])
gshCtx, _ = gshellv(gshCtx, argv[2:])
gshPA.Files[fdix] = savfd
return gshCtx, false
}
//fmt.Fprintf(res, "GShell Status: %q", html.EscapeString(req.URL.Path))
func httpHandler(res http.ResponseWriter, req *http.Request){
path := req.URL.Path
fmt.Printf("--I-- Got HTTP Request(%s)\n",path)
{
gshCtx, _ := setupGshContext()
fmt.Printf("--I-- %s\n",path[1:])
gshCtx, _ = tgshelll(gshCtx,path[1:])
}
fmt.Fprintf(res, "Hello(^-^)/\n%s\n",path)
}
func httpServer(gshCtx GshContext, argv []string){
http.HandleFunc("/", httpHandler)
accport := "localhost:9999"
fmt.Printf("--I-- HTTP Server Start at [%s]\n",accport)
http.ListenAndServe(accport,nil)
}
func xGo(gshCtx GshContext, argv[]string){
go gshellv(gshCtx,argv[1:]);
}
func xPs(gshCtx GshContext, argv[]string)(GshContext){
return gshCtx
}
func gshellv(gshCtx GshContext, argv []string) (_ GshContext, fin bool) {
fin = false
if gshCtx.CmdTrace { fmt.Fprintf(os.Stderr,"--I-- gshellv((%d))\n",len(argv)) }
if len(argv) <= 0 {
return gshCtx, false
}
for ai := 0; ai < len(argv); ai++ {
argv[ai] = strsubst(argv[ai])
}
if false {
for ai := 0; ai < len(argv); ai++ {
fmt.Printf("[%d] %s [%d]%T\n",
ai,argv[ai],len(argv[ai]),argv[ai])
}
}
cmd := argv[0]
if gshCtx.CmdTrace { fmt.Fprintf(os.Stderr,"--I-- gshellv(%d)%v\n",len(argv),argv) }
switch { // https://tour.golang.org/flowcontrol/11
case cmd == "":
xPwd(gshCtx,[]string{}); // emtpy command
case cmd == "-x":
gshCtx.CmdTrace = ! gshCtx.CmdTrace
case cmd == "-ot":
sconnect(gshCtx, true, argv)
case cmd == "-ou":
sconnect(gshCtx, false, argv)
case cmd == "-it":
saccept(gshCtx, true , argv)
case cmd == "-iu":
saccept(gshCtx, false, argv)
case cmd == "-i" || cmd == "<" || cmd == "-o" || cmd == ">" || cmd == "-a" || cmd == ">>" || cmd == "-s" || cmd == "><":
redirect(gshCtx, argv)
case cmd == "|":
gshCtx = fromPipe(gshCtx, argv)
case cmd == "bg" || cmd == "-bg":
rgshCtx, rfin := inBackground(gshCtx,argv[1:])
return rgshCtx, rfin
case cmd == "call":
gshCtx, _ = excommand(gshCtx, false,argv[1:])
case cmd == "cd" || cmd == "chdir":
gshCtx = xChdir(gshCtx,argv);
case cmd == "close":
gshCtx = xClose(gshCtx,argv)
case cmd == "#define":
case cmd == "echo":
echo(argv,true)
case cmd == "env":
env(argv)
case cmd == "eval":
eval(argv,true)
case cmd == "exec":
gshCtx, _ = excommand(gshCtx, true,argv[1:])
// should not return here
case cmd == "exit" || cmd == "quit":
// write Result code EXIT to 3>
return gshCtx, true
case cmd == "-find":
find(argv)
case cmd == "fork":
// mainly for a server
case cmd == "-gen":
gen(gshCtx, argv)
case cmd == "-go":
xGo(gshCtx, argv)
case cmd == "history" || cmd == "hi": // hi should be alias
gshCtx = xHistory(gshCtx, argv)
case cmd == "jobs":
xJobs(gshCtx,argv)
case cmd == "nop":
case cmd == "pipe":
gshCtx = xOpen(gshCtx,argv)
case cmd == "ps":
xPs(gshCtx,argv)
case cmd == "pstitle": // to be gsh.title
case cmd == "repeat" || cmd == "rep": // repeat cond command
repeat(gshCtx,argv)
case cmd == "set":
// set name ...
case cmd == "serv":
httpServer(gshCtx,argv)
case cmd == "sleep":
sleep(gshCtx,argv)
case cmd == "time":
gshCtx, fin = xTime(gshCtx,argv)
case cmd == "pwd":
xPwd(gshCtx,argv);
case cmd == "ver" || cmd == "-ver":
fmt.Printf("%s\n",VERSION);
case cmd == "where":
// data file or so?
case cmd == "which":
which("PATH",argv);
default:
gshCtx, _ = excommand(gshCtx, false,argv)
}
return gshCtx, fin
}
func gshelll(gshCtx GshContext, gline string) (gx GshContext, rfin bool) {
argv := strings.Split(string(gline)," ")
gshCtx, fin := gshellv(gshCtx,argv)
return gshCtx, fin
}
func tgshelll(gshCtx GshContext, gline string) (gx GshContext, xfin bool) {
start := time.Now()
gshCtx, fin := gshelll(gshCtx,gline)
end := time.Now()
elps := end.Sub(start);
fmt.Printf("--I-- " + time.Now().Format(time.Stamp) + "(%d.%09ds)\n",
elps/1000000000,elps%1000000000)
return gshCtx, fin
}
func Ttyid() (int) {
fi, err := os.Stdin.Stat()
if err != nil {
return 0;
}
//fmt.Printf("Stdin: %v Dev=%d\n",
// fi.Mode(),fi.Mode()&os.ModeDevice)
if (fi.Mode() & os.ModeDevice) != 0 {
stat := syscall.Stat_t{};
err := syscall.Fstat(0,&stat)
if err != nil {
//fmt.Printf("--I-- Stdin: (%v)\n",err)
}else{
//fmt.Printf("--I-- Stdin: rdev=%d %d\n",
// stat.Rdev&0xFF,stat.Rdev);
//fmt.Printf("--I-- Stdin: tty%d\n",stat.Rdev&0xFF);
return int(stat.Rdev & 0xFF)
}
}
return 0
}
func ttyfile(gshCtx GshContext) string {
//fmt.Printf("--I-- GSH_HOME=%s\n",gshCtx.GshHomeDir)
ttyfile := gshCtx.GshHomeDir + "/" + "gsh-tty" +
strconv.Itoa(gshCtx.TerminalId)
//fmt.Printf("--I-- ttyfile=%s\n",ttyfile)
return ttyfile
}
func ttyline(gshCtx GshContext) (*os.File){
file, err := os.OpenFile(ttyfile(gshCtx),
os.O_RDWR|os.O_CREATE|os.O_TRUNC,0600)
if err != nil {
fmt.Printf("--F-- cannot open %s (%s)\n",ttyfile(gshCtx),err)
return file;
}
return file
}
func getline(gshCtx GshContext, hix int, skipping, with_exgetline bool, gsh_getlinev[]string, prevline string) (string) {
if( skipping ){
reader := bufio.NewReaderSize(os.Stdin,LINESIZE)
line, _, _ := reader.ReadLine()
return string(line)
}else
if( with_exgetline && gshCtx.GetLine != "" ){
//var xhix int64 = int64(hix); // cast
newenv := os.Environ()
newenv = append(newenv, "GSH_LINENO="+strconv.FormatInt(int64(hix),10) )
tty := ttyline(gshCtx)
tty.WriteString(prevline)
Pa := os.ProcAttr {
"", // start dir
newenv, //os.Environ(),
[]*os.File{os.Stdin,os.Stdout,os.Stderr,tty},
nil,
}
//fmt.Printf("--I-- getline=%s // %s\n",gsh_getlinev[0],gshCtx.GetLine)
proc, err := os.StartProcess(gsh_getlinev[0],[]string{"getline","getline"},&Pa)
if err != nil {
fmt.Printf("Proc ERROR (%s)\n",nil)
for ; ; {
}
}
//stat, err := proc.Wait()
proc.Wait()
buff := make([]byte,LINESIZE)
count, err := tty.Read(buff)
//_, err = tty.Read(buff)
//fmt.Printf("--D-- getline (%d)\n",count)
if err != nil {
if ! (count == 0) { // && err.String() == "EOF" ) {
fmt.Printf("--E-- getline error (%s)\n",err)
}
}else{
//fmt.Printf("--I-- getline OK \"%s\"\n",buff)
}
tty.Close()
return string(buff[0:count])
}else{
// if isatty {
fmt.Printf("!%d",hix)
fmt.Print(PROMPT)
// }
reader := bufio.NewReaderSize(os.Stdin,LINESIZE)
line, _, _ := reader.ReadLine()
return string(line)
}
}
//
// $USERHOME/.gsh/
// gsh-rc.txt, or gsh-configure.txt
// gsh-history.txt
// gsh-aliases.txt // should be conditional?
//
func gshSetupHomedir(gshCtx GshContext) (GshContext, bool) {
homedir, err := os.UserHomeDir()
if err != nil {
fmt.Printf("--E-- You have no UserHomeDir (%v)\n",err)
return gshCtx, true
}
gshhome := homedir + "/" + GSH_HOME
_, err2 := os.Stat(gshhome)
if err2 != nil {
err3 := os.Mkdir(gshhome,0700)
if err3 != nil {
fmt.Printf("--E-- Could not Create %s (%s)\n",
gshhome,err)
return gshCtx, true
}
fmt.Printf("--I-- Created %s\n",gshhome)
}
gshCtx.GshHomeDir = gshhome
return gshCtx, false
}
func setupGshContext()(GshContext,bool){
gshPA := syscall.ProcAttr {
"", // the staring directory
os.Environ(), // environ[]
[]uintptr{os.Stdin.Fd(),os.Stdout.Fd(),os.Stderr.Fd()},
nil, // OS specific
}
cwd, _ := os.Getwd()
gshCtx := GshContext {
cwd, // StartDir
"", // GetLine
[]GChdirHistory { {cwd,time.Now()} }, // ChdirHistory
gshPA,
[]GCommandHistory{}, //something for invokation?
GCommandHistory{}, // CmdCurrent
false,
[]int{},
syscall.Rusage{},
"", // GshHomeDir
Ttyid(),
false,
}
err := false
gshCtx, err = gshSetupHomedir(gshCtx)
return gshCtx, err
}
func script(gshCtxGiven *GshContext) (_ GshContext) {
gshCtx,err0 := setupGshContext()
if err0 {
return gshCtx;
}
//fmt.Printf("--I-- GSH_HOME=%s\n",gshCtx.GshHomeDir)
//resmap()
gsh_getlinev, with_exgetline :=
which("PATH",[]string{"which","gsh-getline","-s"})
if with_exgetline {
gsh_getlinev[0] = toFullpath(gsh_getlinev[0])
gshCtx.GetLine = toFullpath(gsh_getlinev[0])
}else{
fmt.Printf("--W-- No gsh-getline found. Using internal getline.\n");
}
prevline := ""
skipping := false
for hix := 1; ; {
gline := getline(gshCtx,hix,skipping,with_exgetline,gsh_getlinev,prevline)
if skipping {
if strings.Index(gline,"fi") == 0 {
fmt.Printf("fi\n");
skipping = false;
}else{
//fmt.Printf("%s\n",gline);
}
continue
}
if strings.Index(gline,"if") == 0 {
//fmt.Printf("--D-- if start: %s\n",gline);
skipping = true;
continue
}
if 0 < len(gline) && gline[0] == '!' {
xgline, set, err := searchHistory(gshCtx,gline)
if err {
continue
}
if set {
// set the line in command line editor
}
gline = xgline
}
ghist := gshCtx.CmdCurrent
ghist.WorkDir,_ = os.Getwd()
ghist.StartAt = time.Now()
rusagev1 := Getrusagev()
xgshCtx, fin := tgshelll(gshCtx,gline)
rusagev2 := Getrusagev()
ghist.Rusagev = RusageSubv(rusagev2,rusagev1)
gshCtx = xgshCtx
ghist.EndAt = time.Now()
ghist.CmdLine = gline
/* record it but not show in list by default
if len(gline) == 0 {
continue
}
if gline == "hi" || gline == "history" { // don't record it
continue
}
*/
gshCtx.CommandHistory = append(gshCtx.CommandHistory, ghist)
if fin {
break;
}
prevline = gline;
hix++;
}
return gshCtx
}
func main() {
gshCtx := script(nil)
gshelll(gshCtx,"time")
}
// TODO:
// - inter gsh communication, possibly running in remote hosts -- to be remote shell
// - merged histories of multiple parallel gsh sessions
// - alias as a function
// - instant alias end environ export to the permanent > ~/.gsh/gsh-alias and gsh-environ
// - retrieval PATH of files by its type
// - gsh as an IME
// - all commands have its subucomand after "---" symbol
// - filename expansion by "-find" command
// - history of ext code and output of each commoand
// - "script" output for each command by pty-tee or telnet-tee
// - $BUILTIN command in PATH to show the priority
// - "?" symbol in the command (not as in arguments) shows help request
// - searching command with wild card like: which ssh-*
// - longformat prompt after long idle time (should dismiss by BS)
//---END--- (^-^)/