Allow overriding file mtime, initialize go module

.gitignore

@@ -0,0 +1 @@
+.idea

generator.go

@@ -32,7 +32,7 @@ func Generate(input http.FileSystem, opt Options) error {
 	}
 
 	var toc toc
-	err = findAndWriteFiles(buf, input, &toc)
+	err = findAndWriteFiles(buf, input, &toc, opt)
 	if err != nil {
 		return err
 	}
@@ -79,7 +79,7 @@ type dirInfo struct {
 // findAndWriteFiles recursively finds all the file paths in the given directory tree.
 // They are added to the given map as keys. Values will be safe function names
 // for each file, which will be used when generating the output code.
-func findAndWriteFiles(buf *bytes.Buffer, fs http.FileSystem, toc *toc) error {
+func findAndWriteFiles(buf *bytes.Buffer, fs http.FileSystem, toc *toc, opt Options) error {
 	walkFn := func(path string, fi os.FileInfo, r io.ReadSeeker, err error) error {
 		if err != nil {
 			// Consider all errors reading the input filesystem as fatal.
@@ -88,10 +88,15 @@ func findAndWriteFiles(buf *bytes.Buffer, fs http.FileSystem, toc *toc) error {
 
 		switch fi.IsDir() {
 		case false:
+			modTime := fi.ModTime().UTC()
+			if opt.FileModTime != nil {
+				modTime = *opt.FileModTime
+			}
+
 			file := &fileInfo{
 				Path:             path,
 				Name:             pathpkg.Base(path),
-				ModTime:          fi.ModTime().UTC(),
+				ModTime:          modTime,
 				UncompressedSize: fi.Size(),
 			}
 
@@ -126,10 +131,15 @@ func findAndWriteFiles(buf *bytes.Buffer, fs http.FileSystem, toc *toc) error {
 				return err
 			}
 
+			modTime := fi.ModTime().UTC()
+			if opt.FileModTime != nil {
+				modTime = *opt.FileModTime
+			}
+
 			dir := &dirInfo{
 				Path:    path,
 				Name:    pathpkg.Base(path),
-				ModTime: fi.ModTime().UTC(),
+				ModTime: modTime,
 				Entries: entries,
 			}
 

go.mod

@@ -0,0 +1,9 @@
+module github.com/shurcooL/vfsgen
+
+go 1.13
+
+require (
+	github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749
+	github.com/shurcooL/httpgzip v0.0.0-20190720172056-320755c1c1b0
+	golang.org/x/tools v0.0.0-20200203023011-6f24f261dadb
+)

go.sum

@@ -0,0 +1,18 @@
+github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749 h1:bUGsEnyNbVPw06Bs80sCeARAlK8lhwqGyi6UT8ymuGk=
+github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749/go.mod h1:ZY1cvUeJuFPAdZ/B6v7RHavJWZn2YPVFQ1OSXhCGOkg=
+github.com/shurcooL/httpgzip v0.0.0-20190720172056-320755c1c1b0 h1:mj/nMDAwTBiaCqMEs4cYCqF7pO6Np7vhy1D1wcQGz+E=
+github.com/shurcooL/httpgzip v0.0.0-20190720172056-320755c1c1b0/go.mod h1:919LwcH0M7/W4fcZ0/jy0qGght1GIhqyS/EgWGH2j5Q=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20200203023011-6f24f261dadb h1:Mjk7HEiAvEl5eS8doSYHgS8vXw90VXegoY/vbw8uRGE=
+golang.org/x/tools v0.0.0-20200203023011-6f24f261dadb/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

options.go

@@ -3,6 +3,7 @@ package vfsgen
 import (
 	"fmt"
 	"strings"
+	"time"
 )
 
 // Options for vfsgen code generation.
@@ -26,6 +27,10 @@ type Options struct {
 	// VariableComment is the comment of the http.FileSystem variable in the generated code.
 	// If left empty, it defaults to "{{.VariableName}} statically implements the virtual filesystem provided to vfsgen.".
 	VariableComment string
+
+	// FileModTime overrides file modification times in the generated code.
+	// It is useful to avoid unwanted code diffs using the same file.
+	FileModTime *time.Time
 }
 
 // fillMissing sets default values for mandatory options that are left empty.