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feat: mockgen flag --build_constraint to add //go:build directives #191

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merged 1 commit into from
Sep 25, 2024
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feat: mockgen flag --build_constraint to add //go:build directives #191

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5 changes: 5 additions & 0 deletions mockgen/internal/tests/build_constraint/input.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
package empty_interface

//go:generate mockgen -package empty_interface -destination mock.go -source input.go "-build_constraint=(linux && 386) || (darwin && !cgo) || usertag"

type Empty interface{}
44 changes: 44 additions & 0 deletions mockgen/internal/tests/build_constraint/mock.go
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12 changes: 11 additions & 1 deletion mockgen/mockgen.go
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,7 @@ var (
writeSourceComment = flag.Bool("write_source_comment", true, "Writes original file (source mode) or interface names (reflect mode) comment if true.")
writeGenerateDirective = flag.Bool("write_generate_directive", false, "Add //go:generate directive to regenerate the mock")
copyrightFile = flag.String("copyright_file", "", "Copyright file used to add copyright header")
buildConstraint = flag.String("build_constraint", "", "If non-empty, added as //go:build <constraint>")
typed = flag.Bool("typed", false, "Generate Type-safe 'Return', 'Do', 'DoAndReturn' function")
imports = flag.String("imports", "", "(source mode) Comma-separated name=path pairs of explicit imports to use.")
auxFiles = flag.String("aux_files", "", "(source mode) Comma-separated pkg=path pairs of auxiliary Go source files.")
Expand Down Expand Up @@ -143,7 +144,9 @@ func main() {
}
}

g := new(generator)
g := &generator{
buildConstraint: *buildConstraint,
}
if *source != "" {
g.filename = *source
} else {
Expand Down Expand Up @@ -251,6 +254,7 @@ type generator struct {
destination string // may be empty
srcPackage, srcInterfaces string // may be empty
copyrightHeader string
buildConstraint string // may be empty

packageMap map[string]string // map from import path to package name
}
Expand Down Expand Up @@ -306,6 +310,12 @@ func (g *generator) Generate(pkg *model.Package, outputPkgName string, outputPac
g.p("")
}

if g.buildConstraint != "" {
g.p("//go:build %s", g.buildConstraint)
// https://pkg.go.dev/cmd/go#hdr-Build_constraints:~:text=a%20build%20constraint%20should%20be%20followed%20by%20a%20blank%20line
g.p("")
}

g.p("// Code generated by MockGen. DO NOT EDIT.")
if *writeSourceComment {
if g.filename != "" {
Expand Down