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Copy only the static files changed

Update on the watcher copy static to copy only the
changed files and add an flag forceSyncStatic to
copy all statics always a static is changed

See #1644 #1559

--- a/commands/hugo.go

+++ b/commands/hugo.go

@@ -28,6 +28,8 @@

 	"github.com/spf13/hugo/parser"

+	"regexp"

+

 	"github.com/spf13/cobra"

 	"github.com/spf13/fsync"

 	"github.com/spf13/hugo/helpers"

@@ -40,7 +42,6 @@

 	"github.com/spf13/nitro"

 	"github.com/spf13/viper"

 	"gopkg.in/fsnotify.v1"

-	"regexp"

 )

 // userError is an error used to signal different error situations in command handling.

@@ -111,7 +112,7 @@

 var hugoCmdV *cobra.Command

 // Flags that are to be added to commands.

-var BuildWatch, IgnoreCache, Draft, Future, UglyURLs, CanonifyURLs, Verbose, Logging, VerboseLog, DisableRSS, DisableSitemap, PluralizeListTitles, PreserveTaxonomyNames, NoTimes bool

+var BuildWatch, IgnoreCache, Draft, Future, UglyURLs, CanonifyURLs, Verbose, Logging, VerboseLog, DisableRSS, DisableSitemap, PluralizeListTitles, PreserveTaxonomyNames, NoTimes, ForceSync bool

 var Source, CacheDir, Destination, Theme, BaseURL, CfgFile, LogFile, Editor string

 // Execute adds all child commands to the root command HugoCmd and sets flags appropriately.

@@ -171,7 +172,7 @@

 	cmd.Flags().BoolVar(&nitro.AnalysisOn, "stepAnalysis", false, "display memory and timing of different steps of the program")

 	cmd.Flags().BoolVar(&PluralizeListTitles, "pluralizeListTitles", true, "Pluralize titles in lists using inflect")

 	cmd.Flags().BoolVar(&PreserveTaxonomyNames, "preserveTaxonomyNames", false, `Preserve taxonomy names as written ("Gérard Depardieu" vs "gerard-depardieu")`)

-

+	cmd.Flags().BoolVarP(&ForceSync, "forceSyncStatic", "", false, "Copy all files when static is changed.")

 	// For bash-completion

 	validConfigFilenames := []string{"json", "js", "yaml", "yml", "toml", "tml"}

 	cmd.Flags().SetAnnotation("config", cobra.BashCompFilenameExt, validConfigFilenames)

@@ -229,6 +230,7 @@

 	viper.SetDefault("DisableLiveReload", false)

 	viper.SetDefault("PluralizeListTitles", true)

 	viper.SetDefault("PreserveTaxonomyNames", false)

+	viper.SetDefault("ForceSyncStatic", false)

 	viper.SetDefault("FootnoteAnchorPrefix", "")

 	viper.SetDefault("FootnoteReturnLinkContents", "")

 	viper.SetDefault("NewContentEditor", "")

@@ -297,6 +299,9 @@

 		if cmdV.Flags().Lookup("preserveTaxonomyNames").Changed {

 			viper.Set("PreserveTaxonomyNames", PreserveTaxonomyNames)

 		}

+		if cmdV.Flags().Lookup("forceSyncStatic").Changed {

+			viper.Set("ForceSyncStatic", ForceSync)

+		}

 		if cmdV.Flags().Lookup("editor").Changed {

 			viper.Set("NewContentEditor", Editor)

 		}

@@ -422,11 +427,11 @@

 }

 func copyStatic() error {

-	publishDir := helpers.AbsPathify(viper.GetString("PublishDir")) + "/"

+	publishDir := helpers.AbsPathify(viper.GetString("PublishDir")) + helpers.FilePathSeparator

 	// If root, remove the second '/'

 	if publishDir == "//" {

-		publishDir = "/"

+		publishDir = helpers.FilePathSeparator

 	}

 	syncer := fsync.NewSyncer()

@@ -446,7 +451,7 @@

 	}

 	// Copy the site's own static directory

-	staticDir := helpers.AbsPathify(viper.GetString("StaticDir")) + "/"

+	staticDir := helpers.AbsPathify(viper.GetString("StaticDir")) + helpers.FilePathSeparator

 	if _, err := os.Stat(staticDir); err == nil {

 		jww.INFO.Println("syncing from", staticDir, "to", publishDir)

 		return syncer.Sync(publishDir, staticDir)

@@ -606,11 +611,40 @@

 				}

 				if staticChanged {

-					jww.FEEDBACK.Printf("Static file changed, syncing\n\n")

-					err := copyStatic()

-					if err != nil {

-						fmt.Println(err)

-						utils.StopOnErr(err, fmt.Sprintf("Error copying static files to %s", helpers.AbsPathify(viper.GetString("PublishDir"))))

+					jww.FEEDBACK.Printf("Static file changed, syncing\n")

+					if viper.GetBool("ForceSyncStatic") {

+						jww.FEEDBACK.Printf("Syncing all static files\n")

+						err := copyStatic()

+						if err != nil {

+							fmt.Println(err)

+							utils.StopOnErr(err, fmt.Sprintf("Error copying static files to %s", helpers.AbsPathify(viper.GetString("PublishDir"))))

+						}

+					} else {

+

+						syncer := fsync.NewSyncer()

+						syncer.NoTimes = viper.GetBool("notimes")

+						syncer.SrcFs = hugofs.SourceFs

+						syncer.DestFs = hugofs.DestinationFS

+

+						publishDir := helpers.AbsPathify(viper.GetString("PublishDir")) + helpers.FilePathSeparator

+

+						if publishDir == "//" || publishDir == helpers.FilePathSeparator {

+							publishDir = ""

+						}

+

+						for path := range staticFilesChanged {

+							staticPath := filepath.Join(helpers.AbsPathify(viper.GetString("StaticDir")), path)

+							jww.FEEDBACK.Printf("Syncing file '%s'\n", staticPath)

+

+							if _, err := os.Stat(staticPath); err == nil {

+								publishPath := filepath.Join(publishDir, path)

+								jww.INFO.Println("syncing from", staticPath, "to", publishPath)

+								err := syncer.Sync(publishPath, staticPath)

+								if err != nil {

+									jww.FEEDBACK.Printf("Error on syncing file '%s'\n", staticPath)

+								}

+							}

+						}

 					}

 					if !BuildWatch && !viper.GetBool("DisableLiveReload") {