1 files changed, 52 insertions, 0 deletions
diff --git a/src/cmd/go/internal/modcmd/init.go b/src/cmd/go/internal/modcmd/init.go
new file mode 100644
index 0000000..e4be73f
--- /dev/null
+++ b/src/cmd/go/internal/modcmd/init.go
@@ -0,0 +1,52 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// go mod init
+
+package modcmd
+
+import (
+	"cmd/go/internal/base"
+	"cmd/go/internal/modload"
+	"context"
+)
+
+var cmdInit = &base.Command{
+	UsageLine: "go mod init [module-path]",
+	Short:     "initialize new module in current directory",
+	Long: `
+Init initializes and writes a new go.mod file in the current directory, in
+effect creating a new module rooted at the current directory. The go.mod file
+must not already exist.
+
+Init accepts one optional argument, the module path for the new module. If the
+module path argument is omitted, init will attempt to infer the module path
+using import comments in .go files, vendoring tool configuration files (like
+Gopkg.lock), and the current directory (if in GOPATH).
+
+If a configuration file for a vendoring tool is present, init will attempt to
+import module requirements from it.
+
+See https://golang.org/ref/mod#go-mod-init for more about 'go mod init'.
+`,
+	Run: runInit,
+}
+
+func init() {
+	base.AddChdirFlag(&cmdInit.Flag)
+	base.AddModCommonFlags(&cmdInit.Flag)
+}
+
+func runInit(ctx context.Context, cmd *base.Command, args []string) {
+	if len(args) > 1 {
+		base.Fatalf("go: 'go mod init' accepts at most one argument")
+	}
+	var modPath string
+	if len(args) == 1 {
+		modPath = args[0]
+	}
+
+	modload.ForceUseModules = true
+	modload.CreateModFile(ctx, modPath) // does all the hard work
+}