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|
package shell
import (
"fmt"
"io"
"os"
"path"
"regexp"
"sort"
"strings"
"github.com/peterh/liner"
)
var (
line *liner.State
historyPath = path.Join(os.TempDir(), "weed-shell")
)
func RunShell(options ShellOptions) {
line = liner.NewLiner()
defer line.Close()
line.SetCtrlCAborts(true)
setCompletionHandler()
loadHistory()
defer saveHistory()
reg, _ := regexp.Compile(`'.*?'|".*?"|\S+`)
commandEnv := NewCommandEnv(options)
go commandEnv.MasterClient.KeepConnectedToMaster()
commandEnv.MasterClient.WaitUntilConnected()
for {
cmd, err := line.Prompt("> ")
if err != nil {
if err != io.EOF {
fmt.Printf("%v\n", err)
}
return
}
cmds := reg.FindAllString(cmd, -1)
if len(cmds) == 0 {
continue
} else {
line.AppendHistory(cmd)
args := make([]string, len(cmds[1:]))
for i := range args {
args[i] = strings.Trim(string(cmds[1+i]), "\"'")
}
cmd := strings.ToLower(cmds[0])
if cmd == "help" || cmd == "?" {
printHelp(cmds)
} else if cmd == "exit" || cmd == "quit" {
return
} else {
foundCommand := false
for _, c := range Commands {
if c.Name() == cmd || c.Name() == "fs."+cmd {
if err := c.Do(args, commandEnv, os.Stdout); err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
}
foundCommand = true
}
}
if !foundCommand {
fmt.Fprintf(os.Stderr, "unknown command: %v\n", cmd)
}
}
}
}
}
func printGenericHelp() {
msg :=
`Type: "help <command>" for help on <command>
`
fmt.Print(msg)
sort.Slice(Commands, func(i, j int) bool {
return strings.Compare(Commands[i].Name(), Commands[j].Name()) < 0
})
for _, c := range Commands {
helpTexts := strings.SplitN(c.Help(), "\n", 2)
fmt.Printf(" %-30s\t# %s \n", c.Name(), helpTexts[0])
}
}
func printHelp(cmds []string) {
args := cmds[1:]
if len(args) == 0 {
printGenericHelp()
} else if len(args) > 1 {
fmt.Println()
} else {
cmd := strings.ToLower(args[0])
sort.Slice(Commands, func(i, j int) bool {
return strings.Compare(Commands[i].Name(), Commands[j].Name()) < 0
})
for _, c := range Commands {
if c.Name() == cmd {
fmt.Printf(" %s\t# %s\n", c.Name(), c.Help())
}
}
}
}
func setCompletionHandler() {
line.SetCompleter(func(line string) (c []string) {
for _, i := range Commands {
if strings.HasPrefix(i.Name(), strings.ToLower(line)) {
c = append(c, i.Name())
}
}
return
})
}
func loadHistory() {
if f, err := os.Open(historyPath); err == nil {
line.ReadHistory(f)
f.Close()
}
}
func saveHistory() {
if f, err := os.Create(historyPath); err != nil {
fmt.Printf("Error writing history file: %v\n", err)
} else {
line.WriteHistory(f)
f.Close()
}
}
|
