Make Page an interface

The main motivation of this commit is to add a `page.Page` interface to replace the very file-oriented `hugolib.Page` struct.
This is all a preparation step for issue  #5074, "pages from other data sources".

But this also fixes a set of annoying limitations, especially related to custom output formats, and shortcodes.

Most notable changes:

* The inner content of shortcodes using the `{{%` as the outer-most delimiter will now be sent to the content renderer, e.g. Blackfriday.
  This means that any markdown will partake in the global ToC and footnote context etc.
* The Custom Output formats are now "fully virtualized". This removes many of the current limitations.
* The taxonomy list type now has a reference to the `Page` object.
  This improves the taxonomy template `.Title` situation and make common template constructs much simpler.

See #5074
Fixes #5763
Fixes #5758
Fixes #5090
Fixes #5204
Fixes #4695
Fixes #5607
Fixes #5707
Fixes #5719
Fixes #3113
Fixes #5706
Fixes #5767
Fixes #5723
Fixes #5769
Fixes #5770
Fixes #5771
Fixes #5759
Fixes #5776
Fixes #5777
Fixes #5778

commands/commandeer.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -357,6 +357,13 @@ func (c *commandeer) loadConfig(mustHaveConfigFile, running bool) error {
 			c.changeDetector = changeDetector
 		}
 
+		if c.Cfg.GetBool("logPathWarnings") {
+			fs.Destination = hugofs.NewCreateCountingFs(fs.Destination)
+		}
+
+		// To debug hard-to-find path issues.
+		//fs.Destination = hugofs.NewStacktracerFs(fs.Destination, `fr/fr`)
+
 		err = c.initFs(fs)
 		if err != nil {
 			return

commands/commands.go

@@ -1,4 +1,4 @@
-// Copyright 2017 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -23,7 +23,6 @@ import (
 	"github.com/gohugoio/hugo/config"
 	"github.com/gohugoio/hugo/helpers"
 	"github.com/spf13/cobra"
-	"github.com/spf13/nitro"
 )
 
 type commandsBuilder struct {
@@ -197,6 +196,12 @@ type hugoBuilderCommon struct {
 
 	gc bool
 
+	// Profile flags (for debugging of performance problems)
+	cpuprofile   string
+	memprofile   string
+	mutexprofile string
+	traceprofile string
+
 	// TODO(bep) var vs string
 	logging    bool
 	verbose    bool
@@ -255,13 +260,22 @@ func (cc *hugoBuilderCommon) handleFlags(cmd *cobra.Command) {
 	cmd.Flags().Bool("enableGitInfo", false, "add Git revision, date and author info to the pages")
 	cmd.Flags().BoolVar(&cc.gc, "gc", false, "enable to run some cleanup tasks (remove unused cache files) after the build")
 
-	cmd.Flags().BoolVar(&nitro.AnalysisOn, "stepAnalysis", false, "display memory and timing of different steps of the program")
 	cmd.Flags().Bool("templateMetrics", false, "display metrics about template executions")
 	cmd.Flags().Bool("templateMetricsHints", false, "calculate some improvement hints when combined with --templateMetrics")
 	cmd.Flags().BoolP("forceSyncStatic", "", false, "copy all files when static is changed.")
 	cmd.Flags().BoolP("noTimes", "", false, "don't sync modification time of files")
 	cmd.Flags().BoolP("noChmod", "", false, "don't sync permission mode of files")
 	cmd.Flags().BoolP("i18n-warnings", "", false, "print missing translations")
+	cmd.Flags().BoolP("path-warnings", "", false, "print warnings on duplicate target paths etc.")
+	cmd.Flags().StringVarP(&cc.cpuprofile, "profile-cpu", "", "", "write cpu profile to `file`")
+	cmd.Flags().StringVarP(&cc.memprofile, "profile-mem", "", "", "write memory profile to `file`")
+	cmd.Flags().StringVarP(&cc.mutexprofile, "profile-mutex", "", "", "write Mutex profile to `file`")
+	cmd.Flags().StringVarP(&cc.traceprofile, "trace", "", "", "write trace to `file` (not useful in general)")
+
+	// Hide these for now.
+	cmd.Flags().MarkHidden("profile-cpu")
+	cmd.Flags().MarkHidden("profile-mem")
+	cmd.Flags().MarkHidden("profile-mutex")
 
 	cmd.Flags().StringSlice("disableKinds", []string{}, "disable different kind of pages (home, RSS etc.)")
 

commands/commands_test.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -20,6 +20,8 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/gohugoio/hugo/common/types"
+
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 
@@ -41,7 +43,7 @@ func TestExecute(t *testing.T) {
 	assert.NoError(resp.Err)
 	result := resp.Result
 	assert.True(len(result.Sites) == 1)
-	assert.True(len(result.Sites[0].RegularPages) == 1)
+	assert.True(len(result.Sites[0].RegularPages()) == 1)
 }
 
 func TestCommandsPersistentFlags(t *testing.T) {
@@ -75,6 +77,7 @@ func TestCommandsPersistentFlags(t *testing.T) {
 		"--port=1366",
 		"--renderToDisk",
 		"--source=mysource",
+		"--path-warnings",
 	}, func(commands []cmder) {
 		var sc *serverCmd
 		for _, command := range commands {
@@ -112,6 +115,9 @@ func TestCommandsPersistentFlags(t *testing.T) {
 
 		assert.True(cfg.GetBool("gc"))
 
+		// The flag is named path-warnings
+		assert.True(cfg.GetBool("logPathWarnings"))
+
 		// The flag is named i18n-warnings
 		assert.True(cfg.GetBool("logI18nWarnings"))
 
@@ -183,8 +189,8 @@ func TestCommandsExecute(t *testing.T) {
 	}
 
 	for _, test := range tests {
-
-		hugoCmd := newCommandsBuilder().addAll().build().getCommand()
+		b := newCommandsBuilder().addAll().build()
+		hugoCmd := b.getCommand()
 		test.flags = append(test.flags, "--quiet")
 		hugoCmd.SetArgs(append(test.commands, test.flags...))
 
@@ -200,6 +206,13 @@ func TestCommandsExecute(t *testing.T) {
 			assert.NoError(err, fmt.Sprintf("%v", test.commands))
 		}
 
+		// Assert that we have not left any development debug artifacts in
+		// the code.
+		if b.c != nil {
+			_, ok := b.c.destinationFs.(types.DevMarker)
+			assert.False(ok)
+		}
+
 	}
 
 }

commands/convert.go

@@ -1,4 +1,4 @@
-// Copyright 2015 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -20,6 +20,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/gohugoio/hugo/resources/page"
+
 	"github.com/gohugoio/hugo/hugofs"
 
 	"github.com/gohugoio/hugo/helpers"
@@ -124,8 +126,8 @@ func (cc *convertCmd) convertContents(format metadecoders.Format) error {
 
 	site := h.Sites[0]
 
-	site.Log.FEEDBACK.Println("processing", len(site.AllPages), "content files")
-	for _, p := range site.AllPages {
+	site.Log.FEEDBACK.Println("processing", len(site.AllPages()), "content files")
+	for _, p := range site.AllPages() {
 		if err := cc.convertAndSavePage(p, site, format); err != nil {
 			return err
 		}
@@ -133,24 +135,24 @@ func (cc *convertCmd) convertContents(format metadecoders.Format) error {
 	return nil
 }
 
-func (cc *convertCmd) convertAndSavePage(p *hugolib.Page, site *hugolib.Site, targetFormat metadecoders.Format) error {
+func (cc *convertCmd) convertAndSavePage(p page.Page, site *hugolib.Site, targetFormat metadecoders.Format) error {
 	// The resources are not in .Site.AllPages.
-	for _, r := range p.Resources.ByType("page") {
-		if err := cc.convertAndSavePage(r.(*hugolib.Page), site, targetFormat); err != nil {
+	for _, r := range p.Resources().ByType("page") {
+		if err := cc.convertAndSavePage(r.(page.Page), site, targetFormat); err != nil {
 			return err
 		}
 	}
 
-	if p.Filename() == "" {
+	if p.File() == nil {
 		// No content file.
 		return nil
 	}
 
 	errMsg := fmt.Errorf("Error processing file %q", p.Path())
 
-	site.Log.INFO.Println("Attempting to convert", p.LogicalName())
+	site.Log.INFO.Println("Attempting to convert", p.File().Filename())
 
-	f, _ := p.File.(src.ReadableFile)
+	f, _ := p.File().(src.ReadableFile)
 	file, err := f.Open()
 	if err != nil {
 		site.Log.ERROR.Println(errMsg)
@@ -186,7 +188,7 @@ func (cc *convertCmd) convertAndSavePage(p *hugolib.Page, site *hugolib.Site, ta
 
 	newContent.Write(pf.content)
 
-	newFilename := p.Filename()
+	newFilename := p.File().Filename()
 
 	if cc.outputDir != "" {
 		contentDir := strings.TrimSuffix(newFilename, p.Path())

commands/hugo.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -18,11 +18,16 @@ package commands
 import (
 	"fmt"
 	"io/ioutil"
-
 	"os/signal"
+	"runtime/pprof"
+	"runtime/trace"
 	"sort"
 	"sync/atomic"
 
+	"github.com/gohugoio/hugo/hugofs"
+
+	"github.com/gohugoio/hugo/resources/page"
+
 	"github.com/gohugoio/hugo/common/hugo"
 	"github.com/pkg/errors"
 
@@ -214,6 +219,7 @@ func initializeFlags(cmd *cobra.Command, cfg config.Provider) {
 		"themesDir",
 		"verbose",
 		"verboseLog",
+		"duplicateTargetPaths",
 	}
 
 	// Will set a value even if it is the default.
@@ -235,6 +241,7 @@ func initializeFlags(cmd *cobra.Command, cfg config.Provider) {
 	// Set some "config aliases"
 	setValueFromFlag(cmd.Flags(), "destination", cfg, "publishDir", false)
 	setValueFromFlag(cmd.Flags(), "i18n-warnings", cfg, "logI18nWarnings", false)
+	setValueFromFlag(cmd.Flags(), "path-warnings", cfg, "logPathWarnings", false)
 
 }
 
@@ -290,6 +297,7 @@ func (c *commandeer) fullBuild() error {
 	}
 
 	copyStaticFunc := func() error {
+
 		cnt, err := c.copyStatic()
 		if err != nil {
 			if !os.IsNotExist(err) {
@@ -326,7 +334,7 @@ func (c *commandeer) fullBuild() error {
 	}
 
 	for _, s := range c.hugo.Sites {
-		s.ProcessingStats.Static = langCount[s.Language.Lang]
+		s.ProcessingStats.Static = langCount[s.Language().Lang]
 	}
 
 	if c.h.gc {
@@ -344,9 +352,125 @@ func (c *commandeer) fullBuild() error {
 
 }
 
+func (c *commandeer) initCPUProfile() (func(), error) {
+	if c.h.cpuprofile == "" {
+		return nil, nil
+	}
+
+	f, err := os.Create(c.h.cpuprofile)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to create CPU profile")
+	}
+	if err := pprof.StartCPUProfile(f); err != nil {
+		return nil, errors.Wrap(err, "failed to start CPU profile")
+	}
+	return func() {
+		pprof.StopCPUProfile()
+		f.Close()
+	}, nil
+}
+
+func (c *commandeer) initMemProfile() {
+	if c.h.memprofile == "" {
+		return
+	}
+
+	f, err := os.Create(c.h.memprofile)
+	if err != nil {
+		c.logger.ERROR.Println("could not create memory profile: ", err)
+	}
+	defer f.Close()
+	runtime.GC() // get up-to-date statistics
+	if err := pprof.WriteHeapProfile(f); err != nil {
+		c.logger.ERROR.Println("could not write memory profile: ", err)
+	}
+}
+
+func (c *commandeer) initTraceProfile() (func(), error) {
+	if c.h.traceprofile == "" {
+		return nil, nil
+	}
+
+	f, err := os.Create(c.h.traceprofile)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to create trace file")
+	}
+
+	if err := trace.Start(f); err != nil {
+		return nil, errors.Wrap(err, "failed to start trace")
+	}
+
+	return func() {
+		trace.Stop()
+		f.Close()
+	}, nil
+}
+
+func (c *commandeer) initMutexProfile() (func(), error) {
+	if c.h.mutexprofile == "" {
+		return nil, nil
+	}
+
+	f, err := os.Create(c.h.mutexprofile)
+	if err != nil {
+		return nil, err
+	}
+
+	runtime.SetMutexProfileFraction(1)
+
+	return func() {
+		pprof.Lookup("mutex").WriteTo(f, 0)
+		f.Close()
+	}, nil
+
+}
+
+func (c *commandeer) initProfiling() (func(), error) {
+	stopCPUProf, err := c.initCPUProfile()
+	if err != nil {
+		return nil, err
+	}
+
+	defer c.initMemProfile()
+
+	stopMutexProf, err := c.initMutexProfile()
+	if err != nil {
+		return nil, err
+	}
+
+	stopTraceProf, err := c.initTraceProfile()
+	if err != nil {
+		return nil, err
+	}
+
+	return func() {
+		if stopCPUProf != nil {
+			stopCPUProf()
+		}
+		if stopMutexProf != nil {
+			stopMutexProf()
+		}
+
+		if stopTraceProf != nil {
+			stopTraceProf()
+		}
+	}, nil
+}
+
 func (c *commandeer) build() error {
 	defer c.timeTrack(time.Now(), "Total")
 
+	stopProfiling, err := c.initProfiling()
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		if stopProfiling != nil {
+			stopProfiling()
+		}
+	}()
+
 	if err := c.fullBuild(); err != nil {
 		return err
 	}
@@ -356,6 +480,13 @@ func (c *commandeer) build() error {
 		fmt.Println()
 		c.hugo.PrintProcessingStats(os.Stdout)
 		fmt.Println()
+
+		if createCounter, ok := c.destinationFs.(hugofs.DuplicatesReporter); ok {
+			dupes := createCounter.ReportDuplicates()
+			if dupes != "" {
+				c.logger.WARN.Println("Duplicate target paths:", dupes)
+			}
+		}
 	}
 
 	if c.h.buildWatch {
@@ -369,7 +500,7 @@ func (c *commandeer) build() error {
 		checkErr(c.Logger, err)
 		defer watcher.Close()
 
-		var sigs = make(chan os.Signal)
+		var sigs = make(chan os.Signal, 1)
 		signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
 
 		<-sigs
@@ -381,6 +512,17 @@ func (c *commandeer) build() error {
 func (c *commandeer) serverBuild() error {
 	defer c.timeTrack(time.Now(), "Total")
 
+	stopProfiling, err := c.initProfiling()
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		if stopProfiling != nil {
+			stopProfiling()
+		}
+	}()
+
 	if err := c.fullBuild(); err != nil {
 		return err
 	}
@@ -474,11 +616,9 @@ func (c *commandeer) copyStaticTo(sourceFs *filesystems.SourceFilesystem) (uint6
 	}
 	c.logger.INFO.Println("syncing static files to", publishDir)
 
-	var err error
-
 	// because we are using a baseFs (to get the union right).
 	// set sync src to root
-	err = syncer.Sync(publishDir, helpers.FilePathSeparator)
+	err := syncer.Sync(publishDir, helpers.FilePathSeparator)
 	if err != nil {
 		return 0, err
 	}
@@ -619,13 +759,6 @@ func (c *commandeer) getDirList() ([]string, error) {
 	return a, nil
 }
 
-func (c *commandeer) resetAndBuildSites() (err error) {
-	if !c.h.quiet {
-		c.logger.FEEDBACK.Println("Started building sites ...")
-	}
-	return c.hugo.Build(hugolib.BuildCfg{ResetState: true})
-}
-
 func (c *commandeer) buildSites() (err error) {
 	return c.hugo.Build(hugolib.BuildCfg{})
 }
@@ -973,7 +1106,7 @@ func (c *commandeer) handleEvents(watcher *watcher.Batcher,
 				navigate := c.Cfg.GetBool("navigateToChanged")
 				// We have fetched the same page above, but it may have
 				// changed.
-				var p *hugolib.Page
+				var p page.Page
 
 				if navigate {
 					if onePageName != "" {
@@ -982,7 +1115,7 @@ func (c *commandeer) handleEvents(watcher *watcher.Batcher,
 				}
 
 				if p != nil {
-					livereload.NavigateToPathForPort(p.RelPermalink(), p.Site.ServerPort())
+					livereload.NavigateToPathForPort(p.RelPermalink(), p.Site().ServerPort())
 				} else {
 					livereload.ForceRefresh()
 				}
@@ -1044,9 +1177,11 @@ func (c *commandeer) isThemeVsHugoVersionMismatch(fs afero.Fs) (dir string, mism
 		}
 
 		b, err := afero.ReadFile(fs, path)
+		if err != nil {
+			continue
+		}
 
 		tomlMeta, err := metadecoders.Default.UnmarshalToMap(b, metadecoders.TOML)
-
 		if err != nil {
 			continue
 		}

commands/import_jekyll.go

@@ -1,4 +1,4 @@
-// Copyright 2016 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -340,7 +340,7 @@ func copyDir(source string, dest string) error {
 	if err != nil {
 		return err
 	}
-	entries, err := ioutil.ReadDir(source)
+	entries, _ := ioutil.ReadDir(source)
 	for _, entry := range entries {
 		sfp := filepath.Join(source, entry.Name())
 		dfp := filepath.Join(dest, entry.Name())
@@ -373,6 +373,10 @@ func (i *importCmd) copyJekyllFilesAndFolders(jekyllRoot, dest string, jekyllPos
 		return err
 	}
 	entries, err := ioutil.ReadDir(jekyllRoot)
+	if err != nil {
+		return err
+	}
+
 	for _, entry := range entries {
 		sfp := filepath.Join(jekyllRoot, entry.Name())
 		dfp := filepath.Join(dest, entry.Name())
@@ -464,7 +468,7 @@ func convertJekyllPost(s *hugolib.Site, path, relPath, targetDir string, draft b
 
 	fs := hugofs.Os
 	if err := helpers.WriteToDisk(targetFile, strings.NewReader(content), fs); err != nil {
-		return fmt.Errorf("Failed to save file %q:", filename)
+		return fmt.Errorf("failed to save file %q: %s", filename, err)
 	}
 
 	return nil

commands/list.go

@@ -1,4 +1,4 @@
-// Copyright 2015 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -20,6 +20,7 @@ import (
 	"time"
 
 	"github.com/gohugoio/hugo/hugolib"
+	"github.com/gohugoio/hugo/resources/resource"
 	"github.com/spf13/cobra"
 	jww "github.com/spf13/jwalterweatherman"
 )
@@ -70,7 +71,7 @@ List requires a subcommand, e.g. ` + "`hugo list drafts`.",
 
 				for _, p := range sites.Pages() {
 					if p.IsDraft() {
-						jww.FEEDBACK.Println(filepath.Join(p.File.Dir(), p.File.LogicalName()))
+						jww.FEEDBACK.Println(filepath.Join(p.File().Dir(), p.File().LogicalName()))
 					}
 
 				}
@@ -108,8 +109,8 @@ posted in the future.`,
 				defer writer.Flush()
 
 				for _, p := range sites.Pages() {
-					if p.IsFuture() {
-						err := writer.Write([]string{filepath.Join(p.File.Dir(), p.File.LogicalName()), p.PublishDate.Format(time.RFC3339)})
+					if resource.IsFuture(p) {
+						err := writer.Write([]string{filepath.Join(p.File().Dir(), p.File().LogicalName()), p.PublishDate().Format(time.RFC3339)})
 						if err != nil {
 							return newSystemError("Error writing future posts to stdout", err)
 						}
@@ -149,11 +150,12 @@ expired.`,
 				defer writer.Flush()
 
 				for _, p := range sites.Pages() {
-					if p.IsExpired() {
-						err := writer.Write([]string{filepath.Join(p.File.Dir(), p.File.LogicalName()), p.ExpiryDate.Format(time.RFC3339)})
+					if resource.IsExpired(p) {
+						err := writer.Write([]string{filepath.Join(p.File().Dir(), p.File().LogicalName()), p.ExpiryDate().Format(time.RFC3339)})
 						if err != nil {
 							return newSystemError("Error writing expired posts to stdout", err)
 						}
+
 					}
 				}
 

commands/new_content_test.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -62,7 +62,7 @@ func TestDoNewSite_noerror_base_exists_but_empty(t *testing.T) {
 	_, fs := newTestCfg()
 	n := newNewSiteCmd()
 
-	require.NoError(t, fs.Source.MkdirAll(basepath, 777))
+	require.NoError(t, fs.Source.MkdirAll(basepath, 0777))
 
 	require.NoError(t, n.doNewSite(fs, basepath, false))
 }
@@ -72,7 +72,7 @@ func TestDoNewSite_error_base_exists(t *testing.T) {
 	_, fs := newTestCfg()
 	n := newNewSiteCmd()
 
-	require.NoError(t, fs.Source.MkdirAll(basepath, 777))
+	require.NoError(t, fs.Source.MkdirAll(basepath, 0777))
 	_, err := fs.Source.Create(filepath.Join(basepath, "foo"))
 	require.NoError(t, err)
 	// Since the directory already exists and isn't empty, expect an error
@@ -85,7 +85,7 @@ func TestDoNewSite_force_empty_dir(t *testing.T) {
 	_, fs := newTestCfg()
 	n := newNewSiteCmd()
 
-	require.NoError(t, fs.Source.MkdirAll(basepath, 777))
+	require.NoError(t, fs.Source.MkdirAll(basepath, 0777))
 
 	require.NoError(t, n.doNewSite(fs, basepath, true))
 
@@ -99,7 +99,7 @@ func TestDoNewSite_error_force_dir_inside_exists(t *testing.T) {
 
 	contentPath := filepath.Join(basepath, "content")
 
-	require.NoError(t, fs.Source.MkdirAll(contentPath, 777))
+	require.NoError(t, fs.Source.MkdirAll(contentPath, 0777))
 	require.Error(t, n.doNewSite(fs, basepath, true))
 }
 
@@ -109,7 +109,7 @@ func TestDoNewSite_error_force_config_inside_exists(t *testing.T) {
 	n := newNewSiteCmd()
 
 	configPath := filepath.Join(basepath, "config.toml")
-	require.NoError(t, fs.Source.MkdirAll(basepath, 777))
+	require.NoError(t, fs.Source.MkdirAll(basepath, 0777))
 	_, err := fs.Source.Create(configPath)
 	require.NoError(t, err)
 

commands/server.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -358,7 +358,7 @@ func (f *fileServer) createEndpoint(i int) (*http.ServeMux, string, string, erro
 						if err := f.c.partialReRender(p); err != nil {
 							f.c.handleBuildErr(err, fmt.Sprintf("Failed to render %q", p))
 							if f.c.showErrorInBrowser {
-								http.Redirect(w, r, p, 301)
+								http.Redirect(w, r, p, http.StatusMovedPermanently)
 								return
 							}
 						}
@@ -386,7 +386,7 @@ func (f *fileServer) createEndpoint(i int) (*http.ServeMux, string, string, erro
 	return mu, u.String(), endpoint, nil
 }
 
-var logErrorRe = regexp.MustCompile("(?s)ERROR \\d{4}/\\d{2}/\\d{2} \\d{2}:\\d{2}:\\d{2} ")
+var logErrorRe = regexp.MustCompile(`(?s)ERROR \d{4}/\d{2}/\d{2} \d{2}:\d{2}:\d{2} `)
 
 func removeErrorPrefixFromLog(content string) string {
 	return logErrorRe.ReplaceAllLiteralString(content, "")
@@ -403,7 +403,7 @@ func (c *commandeer) serve(s *serverCmd) error {
 	if isMultiHost {
 		for _, s := range c.hugo.Sites {
 			baseURLs = append(baseURLs, s.BaseURL.String())
-			roots = append(roots, s.Language.Lang)
+			roots = append(roots, s.Language().Lang)
 		}
 	} else {
 		s := c.hugo.Sites[0]
@@ -430,7 +430,7 @@ func (c *commandeer) serve(s *serverCmd) error {
 		livereload.Initialize()
 	}
 
-	var sigs = make(chan os.Signal)
+	var sigs = make(chan os.Signal, 1)
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
 
 	for i := range baseURLs {