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list.go
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list.go
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/*
* Copyright (c) 2022 The GoPlus Authors (goplus.org). All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package load
import (
"bytes"
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"sort"
"strings"
)
var (
BuildMod string // BuildMod can be set readonly, vendor, or mod.
)
// ListDriver implement (*igop.Context).Lookup use go list
type ListDriver struct {
init bool
root string
pkgs map[string]string // path -> dir
}
// Lookup implement (*igop.Context).Lookup
func (d *ListDriver) Lookup(root string, path string) (dir string, found bool) {
if !d.init || d.root != root {
d.init = true
d.root = root
err := d.Parse(root)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
}
dir, found = d.pkgs[path]
if found {
return
}
var list []string
for k := range d.pkgs {
if strings.HasPrefix(path, k+"/") {
list = append(list, k)
}
}
switch len(list) {
case 0:
case 1:
v := list[0]
dir, found = filepath.Join(d.pkgs[v], path[len(v+"/"):]), true
default:
// check path/v2
sort.Slice(list, func(i, j int) bool {
return list[i] > list[j]
})
v := list[0]
dir, found = filepath.Join(d.pkgs[v], path[len(v+"/"):]), true
}
return
}
// Parse parse deps by go list
func (d *ListDriver) Parse(root string) error {
args := []string{"list", "-deps", "-e", "-f={{.ImportPath}}={{.Dir}}"}
if BuildMod != "" {
args = append(args, "-mod", BuildMod)
}
data, err := runGoCommand(root, args...)
if err != nil {
return err
}
d.pkgs = make(map[string]string)
for _, line := range strings.Split(string(data), "\n") {
pos := strings.Index(line, "=")
if pos != -1 {
d.pkgs[line[:pos]] = line[pos+1:]
}
}
return nil
}
func runGoCommand(dir string, args ...string) (ret []byte, err error) {
var stdout, stderr bytes.Buffer
cmd := exec.Command("go", args...)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
cmd.Dir = dir
err = cmd.Run()
if err == nil {
ret = stdout.Bytes()
} else if stderr.Len() > 0 {
err = errors.New(stderr.String())
}
return
}