func Shell(call []string) error {
var in *common.BufferedReader
interactive := true
if len(call) > 2 {
call = call[0:1]
}
if len(call) == 2 {
f, err := os.Open(call[1])
if err != nil {
return err
}
defer f.Close()
in = common.NewBufferedReader(f)
interactive = false
} else {
in = common.NewBufferedReader(os.Stdin)
}
var err error
var line string
for err == nil {
if interactive {
fmt.Print("> ")
}
line, err = in.ReadWholeLine()
if err != nil {
return err
}
if isComment(line) {
continue
}
params, ce := common.Parameterize(line)
if ce != nil {
common.DumpError(ce)
continue
}
ce = execute(params)
if ce != nil {
common.DumpError(ce)
continue
}
}
return nil
}
func dumpFile(path string) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
r := common.NewBufferedReader(f)
line, err := r.ReadWholeLine()
for i := uint(0); i < *numLines && err == nil; i++ {
fmt.Println(line)
line, err = r.ReadWholeLine()
}
if err == io.EOF {
err = nil
}
return err
}
func doGrep(pattern *regexp.Regexp, fh io.Reader, fn string, print_fn bool) {
buf := common.NewBufferedReader(fh)
for {
line, err := buf.ReadWholeLine()
if err != nil {
fmt.Fprintf(os.Stderr, "Error while reading from %s: %v\n", fn, err)
return
}
if line == "" {
break
}
if pattern.MatchString(line) {
if print_fn {
fmt.Printf("%s:", fn)
}
fmt.Printf("%s\n", line)
}
}
}
