Strip out an directory-based replacements from main pkg's module

main.go

@@ -474,6 +474,19 @@ type listPkg struct {
 	}
 }
 
+type modEditModule struct {
+	Path    string
+	Version string
+}
+
+type modEdit struct {
+	Module  modEditModule
+	Replace []struct {
+		Old modEditModule
+		New modEditModule
+	}
+}
+
 // arg is a wrapper around a command line-provided package
 type arg struct {
 	patt     string     // the command line-provided pattern
@@ -610,6 +623,43 @@ func (a *arg) list(proxy string) error {
 				return err
 			}
 
+			// now we need to drop all the replacements for which the RHS value does
+			// not include a version... because these are directory replacements
+			{
+				var out bytes.Buffer
+				gmeCmd := goCommand("mod", "edit", "-json")
+				gmeCmd.Dir = a.wd
+				gmeCmd.Stdout = &out
+				gmeCmd.Env = buildEnv("")
+				if err := gmeCmd.run(); err != nil {
+					return err
+				}
+				var mod modEdit
+				if err := json.Unmarshal(out.Bytes(), &mod); err != nil {
+					return fmt.Errorf("failed to process output of %v: %v\n%s", strings.Join(gmeCmd.Args, " "), err, out.Bytes())
+				}
+				var todrop []string
+				for _, r := range mod.Replace {
+					if r.New.Version != "" {
+						continue
+					}
+					drop := r.Old.Path
+					if r.Old.Version != "" {
+						drop += "@" + r.Old.Version
+					}
+					todrop = append(todrop, "-dropreplace="+drop)
+				}
+				if len(todrop) > 0 {
+					gmeCmd := goCommand("mod", "edit")
+					gmeCmd.Args = append(gmeCmd.Args, todrop...)
+					gmeCmd.Dir = a.wd
+					gmeCmd.Env = buildEnv("")
+					if err := gmeCmd.run(); err != nil {
+						return err
+					}
+				}
+			}
+
 			// now that we effectively have a copy of everything relevant in the
 			// target module (including replace directives), list to ensure they
 			// have been resolved

testdata/mod/github.com_gobin-testrepos_simple-main-directory-replace_v1.0.0.txt

@@ -0,0 +1,27 @@
+-- .mod --
+module github.com/gobin-testrepos/simple-main-directory-replace
+
+require github.com/gobin-testrepos/food v1.0.0
+
+replace github.com/gobin-testrepos/food => /road/to/nowhere
+-- .info --
+{"Version":"v1.0.0","Time":"2018-10-22T18:45:39Z"}
+
+-- go.mod --
+module github.com/gobin-testrepos/simple-main-directory-replace
+
+require github.com/gobin-testrepos/food v1.0.0
+
+replace github.com/gobin-testrepos/food => /road/to/nowhere
+
+-- main.go --
+package main
+
+import "fmt"
+
+import "github.com/gobin-testrepos/food"
+
+func main() {
+	fmt.Println("Simple module-based main v1.0.0")
+	fmt.Printf("Today we will eat %v\n", food.MainCourse)
+}

testdata/replace_directory.txt

@@ -0,0 +1,7 @@
+# Verify that directory-target replace statements in the main package's module
+# are ignored.
+
+env HOME=$WORK/home
+gobin -run github.com/gobin-testrepos/simple-main-directory-replace@v1.0.0
+stdout '^Simple module-based main v1.0.0$'
+stdout '^Today we will eat fish$'