From c1d3a937fcc0e767d657e3d94767606ff017c555 Mon Sep 17 00:00:00 2001
From: Aleksandr Razumov <ar@gortc.io>
Date: Tue, 28 Jan 2020 18:07:00 +0300
Subject: [PATCH] all: allow using go run in go:generate

Leaving this feature as opt-in for backward compatibility.

Relates: #160, #106
---
 cmd/wire/main.go      |  3 +++
 internal/wire/wire.go | 13 ++++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/cmd/wire/main.go b/cmd/wire/main.go
index 36c06e98..0502fb6b 100644
--- a/cmd/wire/main.go
+++ b/cmd/wire/main.go
@@ -100,6 +100,7 @@ func newGenerateOptions(headerFile string) (*wire.GenerateOptions, error) {
 type genCmd struct {
 	headerFile     string
 	prefixFileName string
+	useGoRun       bool
 }
 
 func (*genCmd) Name() string { return "gen" }
@@ -117,6 +118,7 @@ func (*genCmd) Usage() string {
 func (cmd *genCmd) SetFlags(f *flag.FlagSet) {
 	f.StringVar(&cmd.headerFile, "header_file", "", "path to file to insert as a header in wire_gen.go")
 	f.StringVar(&cmd.prefixFileName, "output_file_prefix", "", "string to prepend to output file names.")
+	f.BoolVar(&cmd.useGoRun, "use_go_run", false, "use go run in //go:generate instead of binary name")
 }
 
 func (cmd *genCmd) Execute(ctx context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
@@ -132,6 +134,7 @@ func (cmd *genCmd) Execute(ctx context.Context, f *flag.FlagSet, args ...interfa
 	}
 
 	opts.PrefixOutputFile = cmd.prefixFileName
+	opts.UseGoRun = cmd.useGoRun
 
 	outs, errs := wire.Generate(ctx, wd, os.Environ(), packages(f), opts)
 	if len(errs) > 0 {
diff --git a/internal/wire/wire.go b/internal/wire/wire.go
index b55ff29f..74047b1e 100644
--- a/internal/wire/wire.go
+++ b/internal/wire/wire.go
@@ -65,6 +65,7 @@ type GenerateOptions struct {
 	// Header will be inserted at the start of each generated file.
 	Header           []byte
 	PrefixOutputFile string
+	UseGoRun         bool
 }
 
 // Generate performs dependency injection for the packages that match the given
@@ -96,7 +97,11 @@ func Generate(ctx context.Context, wd string, env []string, patterns []string, o
 			continue
 		}
 		generated[i].OutputPath = filepath.Join(outDir, opts.PrefixOutputFile+"wire_gen.go")
-		g := newGen(pkg)
+		command := "wire"
+		if opts.UseGoRun {
+			command = "go run github.com/google/wire/cmd/wire"
+		}
+		g := newGen(pkg, command)
 		injectorFiles, errs := generateInjectors(g, pkg)
 		if len(errs) > 0 {
 			generated[i].Errs = errs
@@ -245,11 +250,13 @@ type gen struct {
 	imports     map[string]importInfo
 	anonImports map[string]bool
 	values      map[ast.Expr]string
+	command     string
 }
 
-func newGen(pkg *packages.Package) *gen {
+func newGen(pkg *packages.Package, command string) *gen {
 	return &gen{
 		pkg:         pkg,
+		command:     command,
 		anonImports: make(map[string]bool),
 		imports:     make(map[string]importInfo),
 		values:      make(map[ast.Expr]string),
@@ -263,7 +270,7 @@ func (g *gen) frame() []byte {
 	}
 	var buf bytes.Buffer
 	buf.WriteString("// Code generated by Wire. DO NOT EDIT.\n\n")
-	buf.WriteString("//go:generate wire\n")
+	buf.WriteString("//go:generate " + g.command + "\n")
 	buf.WriteString("//+build !wireinject\n\n")
 	buf.WriteString("package ")
 	buf.WriteString(g.pkg.Name)