wide/editor/editors.go

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package editor
import (
"bytes"
"encoding/json"
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"github.com/b3log/wide/conf"
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"github.com/b3log/wide/user"
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"github.com/b3log/wide/util"
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"github.com/golang/glog"
"github.com/gorilla/websocket"
"net/http"
"os"
"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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)
var editorWS = map[string]*websocket.Conn{}
func WSHandler(w http.ResponseWriter, r *http.Request) {
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session, _ := user.Session.Get(r, "wide-session")
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sid := session.Values["id"].(string)
editorWS[sid], _ = websocket.Upgrade(w, r, nil, 1024, 1024)
ret := map[string]interface{}{"output": "Editor initialized", "cmd": "init-editor"}
editorWS[sid].WriteJSON(&ret)
glog.Infof("Open a new [Editor] with session [%s], %d", sid, len(editorWS))
args := map[string]interface{}{}
for {
if err := editorWS[sid].ReadJSON(&args); err != nil {
if err.Error() == "EOF" {
return
}
if err.Error() == "unexpected EOF" {
return
}
glog.Error("Editor WS ERROR: " + err.Error())
return
}
code := args["code"].(string)
line := int(args["cursorLine"].(float64))
ch := int(args["cursorCh"].(float64))
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offset := getCursorOffset(code, line, ch)
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// glog.Infof("offset: %d", offset)
argv := []string{"-f=json", "autocomplete", strconv.Itoa(offset)}
var output bytes.Buffer
cmd := exec.Command("gocode", argv...)
cmd.Stdout = &output
stdin, _ := cmd.StdinPipe()
cmd.Start()
stdin.Write([]byte(code))
stdin.Close()
cmd.Wait()
ret = map[string]interface{}{"output": string(output.Bytes()), "cmd": "autocomplete"}
if err := editorWS[sid].WriteJSON(&ret); err != nil {
glog.Error("Editor WS ERROR: " + err.Error())
return
}
}
}
func FmtHandler(w http.ResponseWriter, r *http.Request) {
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data := map[string]interface{}{"succ": true}
defer util.RetJSON(w, r, data)
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decoder := json.NewDecoder(r.Body)
var args map[string]interface{}
if err := decoder.Decode(&args); err != nil {
glog.Error(err)
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data["succ"] = false
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return
}
filePath := args["file"].(string)
fout, err := os.Create(filePath)
if nil != err {
glog.Error(err)
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data["succ"] = false
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return
}
code := args["code"].(string)
fout.WriteString(code)
if err := fout.Close(); nil != err {
glog.Error(err)
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data["succ"] = false
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return
}
argv := []string{filePath}
cmd := exec.Command("gofmt", argv...)
bytes, _ := cmd.Output()
output := string(bytes)
if "" == output {
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data["succ"] = false
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return
}
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data["code"] = string(output)
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}
func AutocompleteHandler(w http.ResponseWriter, r *http.Request) {
decoder := json.NewDecoder(r.Body)
var args map[string]interface{}
if err := decoder.Decode(&args); err != nil {
glog.Error(err)
http.Error(w, err.Error(), 500)
return
}
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session, _ := user.Session.Get(r, "wide-session")
username := session.Values["username"].(string)
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code := args["code"].(string)
line := int(args["cursorLine"].(float64))
ch := int(args["cursorCh"].(float64))
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offset := getCursorOffset(code, line, ch)
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// glog.Infof("offset: %d", offset)
argv := []string{"-f=json", "autocomplete", strconv.Itoa(offset)}
cmd := exec.Command("gocode", argv...)
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// 设置环境变量(设置当前用户的 GOPATH 等)
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setCmdEnv(cmd, username)
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stdin, _ := cmd.StdinPipe()
stdin.Write([]byte(code))
stdin.Close()
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output, err := cmd.CombinedOutput()
if nil != err {
glog.Error(err)
http.Error(w, err.Error(), 500)
return
}
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w.Header().Set("Content-Type", "application/json")
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w.Write(output)
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}
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func getCursorOffset(code string, line, ch int) (offset int) {
lines := strings.Split(code, "\n")
for i := 0; i < line; i++ {
offset += len(lines[i])
}
offset += line + ch
return
}
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func setCmdEnv(cmd *exec.Cmd, username string) {
userRepos := strings.Replace(conf.Wide.UserRepos, "{user}", username, -1)
userWorkspace := userRepos[:strings.LastIndex(userRepos, "/src")]
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userWorkspace = filepath.FromSlash(userWorkspace)
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glog.Infof("User [%s] workspace [%s]", username, userWorkspace)
masterWorkspace := conf.Wide.Repos[:strings.LastIndex(conf.Wide.Repos, "/src")]
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masterWorkspace = filepath.FromSlash(masterWorkspace)
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glog.Infof("Master workspace [%s]", masterWorkspace)
GOPATH := os.Getenv("GOPATH")
glog.Infof("Env GOPATH [%s]", GOPATH)
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// FIXME: 这个地方和 gocode 取环境变量有冲突,估计需要修改 gocode
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//cmd.Env = append(cmd.Env,
// "GOPATH="+GOPATH+string(os.PathListSeparator)+
// userWorkspace+string(os.PathListSeparator)+
// masterWorkspace,
// "GOROOT="+os.Getenv("GOROOT"),
// "PATH="+os.Getenv("PATH"))
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}