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mod.go
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mod.go
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/*
Copyright 2020 Qiniu Cloud (qiniu.com)
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 modutil
import (
"go/build"
"os"
"path/filepath"
"strings"
"sync"
"syscall"
"github.com/visualfc/fastmod"
)
var (
// BuildContext is the default build context.
BuildContext = &build.Default
)
// -----------------------------------------------------------------------------
// gPkgModPath - base path that `go get` places all versioned packages.
var gPkgModPath string
var gGorootSrcPath string
// LookupModFile finds go.mod file for a package directory.
func LookupModFile(dir string) (file string, err error) {
file, err = fastmod.LookupModFile(dir)
if err != nil {
return
}
if file == "" {
err = syscall.ENOENT
}
return
}
// -----------------------------------------------------------------------------
type modules = *fastmod.ModuleList
var gMods modules
var onceMods sync.Once
func getModules() modules {
if gMods == nil {
onceMods.Do(func() {
gPkgModPath = fastmod.GetPkgModPath(BuildContext) + "/"
gGorootSrcPath = BuildContext.GOROOT + "/src/"
gMods = fastmod.NewModuleList(BuildContext)
})
}
return gMods
}
// LoadModule loads a module from specified dir.
func LoadModule(dir string) (mod *Module, err error) {
impl, err := getModules().LoadModule(dir)
if err != nil {
return
}
isMod := strings.HasPrefix(dir, gPkgModPath)
modKind := 0
if isMod {
modKind = modKindMod
} else if impl.Path() == "std" {
modKind = modKindStd
}
return &Module{impl, dir, modKind}, nil
}
// -----------------------------------------------------------------------------
const (
modKindMod = 0x01
modKindStd = 0x02
)
// Module represents a loaded module.
type Module struct {
impl *fastmod.Module
dir string
modKind int
}
// Lookup returns package info, if found.
func (p Module) Lookup(pkg string) (pi PackageInfo, err error) {
dir := filepath.Join(BuildContext.GOROOT, "src", pkg)
if isDirExist(dir) {
return PackageInfo{VersionPkgPath: pkg, Location: dir, Type: PkgTypeStd}, nil
}
_, dir, typ := p.impl.Lookup(pkg)
if typ == fastmod.PkgTypeNil {
err = syscall.ENOENT
return
}
if typ == PkgTypeDepMod {
pkg = strings.TrimPrefix(dir, gPkgModPath)
}
return PackageInfo{VersionPkgPath: pkg, Location: dir, Type: typ}, nil
}
// ModFile returns `go.mod` file path of this module. eg. `$HOME/work/qiniu/qlang/go.mod`
func (p Module) ModFile() string {
return p.impl.ModFile()
}
// RootPath returns root path of this module. eg. `$HOME/work/qiniu/qlang`
func (p Module) RootPath() string {
return p.impl.ModDir()
}
// PkgPath returns PkgPath of this module. eg. `github.com/qiniu/qlang/v6`
func (p Module) PkgPath() string {
switch p.modKind {
case modKindStd:
return strings.TrimPrefix(p.dir, gGorootSrcPath)
default:
return p.impl.Path()
}
}
// VersionPkgPath returns VersionPkgPath of this module. eg. `github.com/qiniu/qlang/v6@v1.0.0`
func (p Module) VersionPkgPath() string {
switch p.modKind {
case modKindMod:
return strings.TrimPrefix(p.impl.ModDir(), gPkgModPath)
case modKindStd:
return strings.TrimPrefix(p.dir, gGorootSrcPath)
default:
return p.impl.Path()
}
}
func isDirExist(dir string) bool {
fi, err := os.Stat(dir)
return err == nil && fi.IsDir()
}
// -----------------------------------------------------------------------------
// PkgType represents a package type.
type PkgType = fastmod.PkgType
const (
// PkgTypeStd - a std module
PkgTypeStd = fastmod.PkgTypeGoroot
// PkgTypeGopath - a module found at $GOPATH/src
PkgTypeGopath = fastmod.PkgTypeGoroot
// PkgTypeThis - this module itself
PkgTypeThis = fastmod.PkgTypeMod
// PkgTypeChild - child module of this module
PkgTypeChild = fastmod.PkgTypeLocal
// PkgTypeDepMod - a depended module found at $GOPATH/pkg/mod
PkgTypeDepMod = fastmod.PkgTypeDepMod
// PkgTypeLocalDep - a module that rewrites to local
PkgTypeLocalDep = fastmod.PkgTypeLocalMod
)
// PackageInfo represents a package info.
type PackageInfo struct {
Location string
VersionPkgPath string
Type PkgType
}
// -----------------------------------------------------------------------------