go - 直接从命令行运行但在 VS Code 上导致 "Not able to determine import path"的简单 Go 代码

Question

这是我第一次用 Go 编码。我正在关注一个示例，并且可以成功运行下面的小应用程序。但我找不到没有在 Visual Studio Code 中运行的原因。到目前为止，我可以看到，我遵循 this answer 中的建议说:“......由于你的包在 $GOPATH 之外，你可能需要创建一个模块文件。你需要使用”来初始化你的 go 模块。
去.mod

module jimis.net/snippetbox

go 1.15

main.go

package main

import (
    "log"
    "net/http"
)

func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/", home)
    mux.HandleFunc("/snippet", showSnippet)
    mux.HandleFunc("/snippet/create", createSnippet)
    log.Println("Starting server on :4000")
    err := http.ListenAndServe(":4000", mux)
    log.Fatal(err)
}

处理程序.go

package main

import (
    "fmt"
    "net/http"
    "strconv"
)

func home(w http.ResponseWriter, r *http.Request) {
    if r.URL.Path != "/" {
        http.NotFound(w, r)
        return
    }
    w.Write([]byte("Hello from Snippetbox"))
}
func showSnippet(w http.ResponseWriter, r *http.Request) {
    id, err := strconv.Atoi(r.URL.Query().Get("id"))
    if err != nil || id < 1 {
        http.NotFound(w, r)
        return
    }
    fmt.Fprintf(w, "Display a specific snippet with ID %d...", id)
}
func createSnippet(w http.ResponseWriter, r *http.Request) {
    if r.Method != http.MethodPost {
        w.Header().Set("Allow", http.MethodPost)
        http.Error(w, "Method Not Allowed", 405)
        return
    }
    w.Write([]byte("Create a new snippet..."))
}

启动.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        
        {
            "name": "Launch",
            "type": "go",
            "request": "launch",
            "mode": "auto",
            "program": "${fileDirname}",
            "env": {},
            "args": []
        }
    ]
}

输出

Starting linting the current package at c:\WSs\snippetbox\cmd\web
Starting "go vet" under the folder c:\WSs\snippetbox\cmd\web
Starting building the current package at c:\WSs\snippetbox\cmd\web
Not able to determine import path of current package by using cwd: c:\WSs\snippetbox\cmd\web and Go workspace: 
C:\WSs\snippetbox\cmd\web>Finished running tool: C:\Go\bin\go.exe vet .

C:\WSs\snippetbox\cmd\web>Finished running tool: C:\Go\bin\go.exe build -i -o C:\Users\DEMETR~1.EXT\AppData\Local\Temp\vscode-go7pNgfo\go-code-check .

项目结构(pkg 和 ui 文件夹为空)

VS 代码 settings.json

{
    "workbench.startupEditor": "newUntitledFile",
    "editor.minimap.enabled": false,
    "go.formatTool": "goimports",
    "explorer.confirmDelete": false,
    "go.toolsEnvVars": {

        "GO111MODULE": "on" /// *** I tried both on and off with no changes on my issue
    }
}

去环境

PS C:\WSs\snippetbox> go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\aa.bb.ext\AppData\Local\go-build
set GOENV=C:\Users\aa.bb.ext\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\aa.bb.ext\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\aa.bb.ext\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=c:\go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=c:\go\pkg\tool\windows_amd64
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\WSs\snippetbox\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\DEMETR~1.EXT\AppData\Local\Temp\go-build201665690=/tmp/go-build -gno-record-gcc-switches
PS C:\WSs\snippetbox>

如果相关，我将此扩展添加到 VSCode
Visual Studio Code v0.16.1 丰富的 Co 语言支持
但是从命令行一切都很好

PS C:\WSs\snippetbox> go run ./cmd/web
2020/08/20 18:19:51 Starting server on :4000

Answer 1

感谢 Go Slack (GOPHERS) 中的讨论，有人指导我找到了这个解决方案。希望它可以帮助 future 的读者。
1 - 添加程序和 cwd 以启动

{
    "version": "0.2.0",
    "configurations": [
       
        {
            "name": "Launch",
            "type": "go",
            "request": "launch",
            "mode": "auto",
            "env": {},
            "args": [],
            "program": "${workspaceRoot}/cmd/web",
            "cwd": "${workspaceFolder}"            
        }
    ]
}

2 - 代码必须在 GOPATH floder 之外
3 - 添加 go.useLanguageServer": true (C:\Users..\AppData\Roaming\Code\User\settings.json)

{
    "workbench.startupEditor": "newUntitledFile",
    "editor.minimap.enabled": false,
    "go.formatTool": "goimports",
    "explorer.confirmDelete": false,
    "go.useLanguageServer": true,
    "go.toolsEnvVars": {
    
        "GO111MODULE": "on"
    }
}

4 - 这是我当前的 GO 扩展，虽然我不知道每个扩展与我的解决方案的相关性如何

PS C:\> code --list-extensions
...
casualjim.gotemplate
dunstontc.vscode-go-syntax      
golang.go