More linting

go.mod

@@ -5,22 +5,23 @@ go 1.12
 require (
 	github.com/BurntSushi/toml v0.3.1 // indirect
 	github.com/agtorre/gocolorize v1.0.0
-	github.com/fsnotify/fsnotify v1.4.7
-	github.com/inconshreveable/log15 v0.0.0-20200109203555-b30bc20e4fd1 // indirect
+	github.com/fsnotify/fsnotify v1.4.9
+	github.com/go-stack/stack v1.8.0 // indirect
+	github.com/inconshreveable/log15 v0.0.0-20201112154412-8562bdadbbac // indirect
 	github.com/jessevdk/go-flags v1.4.0
-	github.com/mattn/go-colorable v0.1.6
+	github.com/mattn/go-colorable v0.1.8
 	github.com/myesui/uuid v1.0.0 // indirect
 	github.com/pkg/errors v0.9.1
-	github.com/revel/config v0.21.0
+	github.com/revel/config v1.0.0
 	github.com/revel/log15 v2.11.20+incompatible
 	github.com/revel/modules v0.21.0 // indirect
 	github.com/revel/pathtree v0.0.0-20140121041023-41257a1839e9 // indirect
-	github.com/revel/revel v0.21.0
+	github.com/revel/revel v1.0.0
 	github.com/stretchr/testify v1.4.0
 	github.com/twinj/uuid v1.0.0 // indirect
 	github.com/xeonx/timeago v1.0.0-rc4 // indirect
-	golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5 // indirect
-	golang.org/x/sys v0.0.0-20200501145240-bc7a7d42d5c3 // indirect
+	golang.org/x/net v0.0.0-20210119194325-5f4716e94777 // indirect
+	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c // indirect
 	golang.org/x/tools v0.0.0-20200219054238-753a1d49df85
 	gopkg.in/fsnotify/fsnotify.v1 v1.4.7
 	gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22

go.sum

@@ -5,12 +5,20 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/inconshreveable/log15 v0.0.0-20200109203555-b30bc20e4fd1 h1:KUDFlmBg2buRWNzIcwLlKvfcnujcHQRQ1As1LoaCLAM=
 github.com/inconshreveable/log15 v0.0.0-20200109203555-b30bc20e4fd1/go.mod h1:cOaXtrgN4ScfRrD9Bre7U1thNq5RtJ8ZoP4iXVGRj6o=
+github.com/inconshreveable/log15 v0.0.0-20201112154412-8562bdadbbac h1:n1DqxAo4oWPMvH1+v+DLYlMCecgumhhgnxAPdqDIFHI=
+github.com/inconshreveable/log15 v0.0.0-20201112154412-8562bdadbbac/go.mod h1:cOaXtrgN4ScfRrD9Bre7U1thNq5RtJ8ZoP4iXVGRj6o=
 github.com/jessevdk/go-flags v1.4.0 h1:4IU2WS7AumrZ/40jfhf4QVDMsQwqA7VEHozFRrGARJA=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/mattn/go-colorable v0.1.6 h1:6Su7aK7lXmJ/U79bYtBjLNaha4Fs1Rg9plHpcH+vvnE=
 github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
+github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/myesui/uuid v1.0.0/go.mod h1:2CDfNgU0LR8mIdO8vdWd8i9gWWxLlcoIGGpSNgafq84=
@@ -20,35 +28,54 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/revel/config v0.21.0 h1:Bw4iXLGAuD/Di2HEhPSOyDywrTlFIXUMbds91lXTtTU=
 github.com/revel/config v0.21.0/go.mod h1:GT4a9px5kDGRqLizcw/md0QFErrhen76toz4qS3oIoI=
+github.com/revel/config v1.0.0 h1:UAzLPQ+x9nJeP6a+H93G+AKEosg3OO2oVLBXK9oSN2U=
+github.com/revel/config v1.0.0/go.mod h1:GT4a9px5kDGRqLizcw/md0QFErrhen76toz4qS3oIoI=
 github.com/revel/log15 v2.11.20+incompatible h1:JkA4tbwIo/UGEMumY50zndKq816RQW3LQ0wIpRc+32U=
 github.com/revel/log15 v2.11.20+incompatible/go.mod h1:l0WmLRs+IM1hBl4noJiBc2tZQiOgZyXzS1mdmFt+5Gc=
 github.com/revel/modules v0.21.0/go.mod h1:UBlNmO9VGZo4j6Ptn2uC/26Iclefuic+V40jYRPBxQE=
+github.com/revel/pathtree v0.0.0-20140121041023-41257a1839e9 h1:/d6kfjzjyx19ieWqMOXHSTLFuRxLOH15ZubtcAXExKw=
 github.com/revel/pathtree v0.0.0-20140121041023-41257a1839e9/go.mod h1:TmlwoRLDvgRjoTe6rbsxIaka/CulzYrgfef7iNJcEWY=
+github.com/revel/revel v0.21.0 h1:E6kDJmpJSDb0F8XwbyG5h4ayzpZ+8Wcw2IiPZW/2qSc=
 github.com/revel/revel v0.21.0/go.mod h1:VZWJnHjpDEtuGUuZJ2NO42XryitrtwsdVaJxfDeo5yc=
+github.com/revel/revel v1.0.0 h1:BsPFnKuuzXEkPtrjdjZHiDcvDmbBiBQvh7Z5c6kLb/Y=
+github.com/revel/revel v1.0.0/go.mod h1:VZWJnHjpDEtuGUuZJ2NO42XryitrtwsdVaJxfDeo5yc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/twinj/uuid v1.0.0 h1:fzz7COZnDrXGTAOHGuUGYd6sG+JMq+AoE7+Jlu0przk=
 github.com/twinj/uuid v1.0.0/go.mod h1:mMgcE1RHFUFqe5AfiwlINXisXfDGro23fWdPUfOMjRY=
+github.com/xeonx/timeago v1.0.0-rc4 h1:9rRzv48GlJC0vm+iBpLcWAr8YbETyN9Vij+7h2ammz4=
 github.com/xeonx/timeago v1.0.0-rc4/go.mod h1:qDLrYEFynLO7y5Ho7w3GwgtYgpy5UfhcXIIQvMKVDkA=
 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/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5 h1:WQ8q63x+f/zpC8Ac1s9wLElVoHhm32p6tudrU72n1QA=
 golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
+golang.org/x/net v0.0.0-20210119194325-5f4716e94777 h1:003p0dJM77cxMSyCPFphvZf/Y5/NXf5fzg6ufd1/Oew=
+golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 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/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200501145240-bc7a7d42d5c3 h1:5B6i6EAiSYyejWfvc5Rc9BbI3rzIsrrXfAQBWnYfn+w=
 golang.org/x/sys v0.0.0-20200501145240-bc7a7d42d5c3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c h1:VwygUrnw9jn88c4u8GD3rZQbqrP/tgas88tPUbBxQrk=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20200219054238-753a1d49df85 h1:XNHaQ2CZDl/SjEZlUXGh7+OQvfLuFgmk3oNWkCFfERE=
 golang.org/x/tools v0.0.0-20200219054238-753a1d49df85/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify/fsnotify.v1 v1.4.7 h1:XNNYLJHt73EyYiCZi6+xjupS9CpvmiDgjPTAjrBlQbo=
 gopkg.in/fsnotify/fsnotify.v1 v1.4.7/go.mod h1:Fyux9zXlo4rWoMSIzpn9fDAYjalPqJ/K1qJ27s+7ltE=
 gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0 h1:1Lc07Kr7qY4U2YPouBjpCLxpiyxIVoxqXgkXLknAOE8=

harness/app.go

@@ -6,7 +6,6 @@ package harness
 
 import (
 	"bytes"
-	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -19,6 +18,16 @@ import (
 	"github.com/revel/cmd/utils"
 )
 
+// Error is used for constant errors.
+type Error string
+
+// Error implements the error interface.
+func (e Error) Error() string {
+	return string(e)
+}
+
+const ErrTimedOut Error = "app timed out"
+
 // App contains the configuration for running a Revel app.  (Not for the app itself)
 // Its only purpose is constructing the command to execute.
 type App struct {
@@ -83,7 +92,8 @@ func (cmd AppCmd) Start(c *model.CommandConfig) error {
 		println("Revel proxy is listening, point your browser to :", c.Run.Port)
 		utils.Logger.Error("Killing revel server process did not respond after wait timeout.", "processid", cmd.Process.Pid)
 		cmd.Kill()
-		return errors.New("revel/harness: app timed out")
+
+		return fmt.Errorf("revel/harness: %w", ErrTimedOut)
 
 	case <-listeningWriter.notifyReady:
 		println("Revel proxy is listening, point your browser to :", c.Run.Port)

harness/harness.go

@@ -16,6 +16,7 @@ package harness
 import (
 	"crypto/tls"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"go/build"
 	"html/template"
@@ -69,6 +70,7 @@ func (h *Harness) renderError(iw http.ResponseWriter, ir *http.Request, err erro
 	if err == nil {
 		utils.Logger.Panic("Caller passed in a nil error")
 	}
+
 	templateSet := template.New("__root__")
 	seekViewOnPath := func(view string) (path string) {
 		path = filepath.Join(h.paths.ViewsPath, "errors", view)
@@ -86,26 +88,27 @@ func (h *Harness) renderError(iw http.ResponseWriter, ir *http.Request, err erro
 		}
 		return
 	}
+
 	target := []string{seekViewOnPath("500.html"), seekViewOnPath("500-dev.html")}
 	if !utils.Exists(target[0]) {
 		fmt.Fprintf(iw, "Target template not found not found %s<br />\n", target[0])
 		fmt.Fprintf(iw, "An error occurred %s", err.Error())
 		return
 	}
+
 	var revelError *utils.SourceError
-	switch e := err.(type) {
-	case *utils.SourceError:
-		revelError = e
-	case error:
+
+	if !errors.As(err, &revelError) {
 		revelError = &utils.SourceError{
 			Title:       "Server Error",
-			Description: e.Error(),
+			Description: err.Error(),
 		}
 	}
 
 	if revelError == nil {
 		panic("no error provided")
 	}
+
 	viewArgs := map[string]interface{}{}
 	viewArgs["RunMode"] = h.paths.RunMode
 	viewArgs["DevMode"] = h.paths.DevMode
@@ -236,32 +239,42 @@ func (h *Harness) refresh() (err *utils.SourceError) {
 	h.app, newErr = Build(h.config, h.paths)
 	if newErr != nil {
 		utils.Logger.Error("Build detected an error", "error", newErr)
-		if castErr, ok := newErr.(*utils.SourceError); ok {
+
+		var castErr *utils.SourceError
+		if errors.As(newErr, &castErr) {
 			return castErr
 		}
+
 		err = &utils.SourceError{
 			Title:       "App failed to start up",
 			Description: err.Error(),
 		}
+
 		return
 	}
 
 	if h.useProxy {
 		h.app.Port = h.port
 		runMode := h.runMode
+
 		if !h.config.HistoricMode {
 			// Recalulate run mode based on the config
 			var paths []byte
 			if len(h.app.PackagePathMap) > 0 {
 				paths, _ = json.Marshal(h.app.PackagePathMap)
 			}
+
 			runMode = fmt.Sprintf(`{"mode":"%s", "specialUseFlag":%v,"packagePathMap":%s}`, h.app.Paths.RunMode, h.config.Verbose, string(paths))
 		}
+
 		if err2 := h.app.Cmd(runMode).Start(h.config); err2 != nil {
 			utils.Logger.Error("Could not start application", "error", err2)
-			if err, k := err2.(*utils.SourceError); k {
+
+			var serr *utils.SourceError
+			if errors.As(err2, &serr) {
 				return err
 			}
+
 			return &utils.SourceError{
 				Title:       "App failed to start up",
 				Description: err2.Error(),
@@ -297,7 +310,11 @@ func (h *Harness) Run() {
 	paths = append(paths, h.paths.CodePaths...)
 	h.watcher = watcher.NewWatcher(h.paths, false)
 	h.watcher.Listen(h, paths...)
-	go h.Refresh()
+	go func() {
+		if err := h.Refresh(); err != nil {
+			utils.Logger.Error("Failed to refresh", "error", err)
+		}
+	}()
 	// h.watcher.Notify()
 
 	if h.useProxy {

logger/composite_multihandler.go

@@ -39,8 +39,11 @@ func (h *CompositeMultiHandler) Log(r *Record) (err error) {
 
 	// Embed the caller function in the context
 	if handler != nil {
-		handler.Log(r)
+		if err := handler.Log(r); err != nil {
+			panic(err)
+		}
 	}
+
 	return
 }
 
@@ -91,8 +94,8 @@ func (h *CompositeMultiHandler) SetHandlers(handler LogHandler, options *LogOpti
 	}
 }
 
-func (h *CompositeMultiHandler) SetJson(writer io.Writer, options *LogOptions) {
-	handler := CallerFileHandler(StreamHandler(writer, JsonFormatEx(
+func (h *CompositeMultiHandler) SetJSON(writer io.Writer, options *LogOptions) {
+	handler := CallerFileHandler(StreamHandler(writer, JSONFormatEx(
 		options.GetBoolDefault("pretty", false),
 		options.GetBoolDefault("lineSeparated", true),
 	)))
@@ -103,7 +106,7 @@ func (h *CompositeMultiHandler) SetJson(writer io.Writer, options *LogOptions) {
 }
 
 // Use built in rolling function.
-func (h *CompositeMultiHandler) SetJsonFile(filePath string, options *LogOptions) {
+func (h *CompositeMultiHandler) SetJSONFile(filePath string, options *LogOptions) {
 	writer := &lumberjack.Logger{
 		Filename:   filePath,
 		MaxSize:    options.GetIntDefault("maxSizeMB", 1024), // megabytes
@@ -111,7 +114,7 @@ func (h *CompositeMultiHandler) SetJsonFile(filePath string, options *LogOptions
 		MaxBackups: options.GetIntDefault("maxBackups", 7),
 		Compress:   options.GetBoolDefault("compress", true),
 	}
-	h.SetJson(writer, options)
+	h.SetJSON(writer, options)
 }
 
 func (h *CompositeMultiHandler) SetTerminal(writer io.Writer, options *LogOptions) {

logger/handlers.go

@@ -50,6 +50,7 @@ func CallerFileHandler(h LogHandler) LogHandler {
 // Adds in a context called `caller` to the record (contains file name and line number like `foo.go:12`)
 // Uses the `log15.CallerFuncHandler` to perform this task.
 func CallerFuncHandler(h LogHandler) LogHandler {
+	// TODO: infinite recursion
 	return CallerFuncHandler(h)
 }
 
@@ -137,8 +138,9 @@ func NotMatchHandler(key string, value interface{}, h LogHandler) LogHandler {
 func MultiHandler(hs ...LogHandler) LogHandler {
 	return FuncHandler(func(r *Record) error {
 		for _, h := range hs {
-			// what to do about failures?
-			h.Log(r)
+			if err := h.Log(r); err != nil {
+				panic(err)
+			}
 		}
 		return nil
 	})
@@ -189,6 +191,7 @@ func (ll *ListLogHandler) Log(r *Record) (err error) {
 			handler.Log(r)
 		}
 	}
+
 	return
 }
 

logger/init.go

@@ -13,7 +13,7 @@ import (
 
 func InitializeFromConfig(basePath string, config *config.Context) (c *CompositeMultiHandler) {
 	// If running in test mode suppress anything that is not an error
-	if config != nil && config.BoolDefault(TEST_MODE_FLAG, false) {
+	if config != nil && config.BoolDefault(TestModeFlag, false) {
 		// Preconfigure all the options
 		config.SetOption("log.info.output", "none")
 		config.SetOption("log.debug.output", "none")
@@ -26,14 +26,14 @@ func InitializeFromConfig(basePath string, config *config.Context) (c *Composite
 	c, _ = NewCompositeMultiHandler()
 
 	// Filters are assigned first, non filtered items override filters
-	if config != nil && !config.BoolDefault(TEST_MODE_FLAG, false) {
+	if config != nil && !config.BoolDefault(TestModeFlag, false) {
 		initAllLog(c, basePath, config)
 	}
 	initLogLevels(c, basePath, config)
 	if c.CriticalHandler == nil && c.ErrorHandler != nil {
 		c.CriticalHandler = c.ErrorHandler
 	}
-	if config != nil && !config.BoolDefault(TEST_MODE_FLAG, false) {
+	if config != nil && !config.BoolDefault(TestModeFlag, false) {
 		initFilterLog(c, basePath, config)
 		if c.CriticalHandler == nil && c.ErrorHandler != nil {
 			c.CriticalHandler = c.ErrorHandler
@@ -47,7 +47,7 @@ func InitializeFromConfig(basePath string, config *config.Context) (c *Composite
 // Init the log.all configuration options.
 func initAllLog(c *CompositeMultiHandler, basePath string, config *config.Context) {
 	if config != nil {
-		extraLogFlag := config.BoolDefault(SPECIAL_USE_FLAG, false)
+		extraLogFlag := config.BoolDefault(SpecialUseFlag, false)
 		if output, found := config.String("log.all.output"); found {
 			// Set all output for the specified handler
 			if extraLogFlag {
@@ -63,7 +63,7 @@ func initAllLog(c *CompositeMultiHandler, basePath string, config *config.Contex
 // log.error.filter ....
 func initFilterLog(c *CompositeMultiHandler, basePath string, config *config.Context) {
 	if config != nil {
-		extraLogFlag := config.BoolDefault(SPECIAL_USE_FLAG, false)
+		extraLogFlag := config.BoolDefault(SpecialUseFlag, false)
 
 		for _, logFilter := range logFilterList {
 			// Init for all filters
@@ -102,7 +102,7 @@ func initLogLevels(c *CompositeMultiHandler, basePath string, config *config.Con
 		"trace", // TODO trace is deprecated
 	} {
 		if config != nil {
-			extraLogFlag := config.BoolDefault(SPECIAL_USE_FLAG, false)
+			extraLogFlag := config.BoolDefault(SpecialUseFlag, false)
 			output, found := config.String("log." + name + ".output")
 			if found {
 				if extraLogFlag {
@@ -178,7 +178,7 @@ func initHandlerFor(c *CompositeMultiHandler, output, basePath string, options *
 			}
 
 			if strings.HasSuffix(output, "json") {
-				c.SetJsonFile(output, options)
+				c.SetJSONFile(output, options)
 			} else {
 				// Override defaults for a terminal file
 				options.SetExtendedOptions("noColor", true)

logger/init_test.go

@@ -59,7 +59,7 @@ var singleCases = []testData{
 func TestSingleCases(t *testing.T) {
 	rootLog := logger.New()
 	for _, testCase := range singleCases {
-		testCase.logTest(rootLog, t)
+		testCase.logTest(t, rootLog)
 		testCase.validate(t)
 	}
 }
@@ -112,7 +112,7 @@ var filterCases = []testData{
 func TestFilterCases(t *testing.T) {
 	rootLog := logger.New("module", "app")
 	for _, testCase := range filterCases {
-		testCase.logTest(rootLog, t)
+		testCase.logTest(t, rootLog)
 		testCase.validate(t)
 	}
 }
@@ -169,7 +169,7 @@ var nfilterCases = []testData{
 func TestNotFilterCases(t *testing.T) {
 	rootLog := logger.New("module", "app")
 	for _, testCase := range nfilterCases {
-		testCase.logTest(rootLog, t)
+		testCase.logTest(t, rootLog)
 		testCase.validate(t)
 	}
 }
@@ -186,7 +186,7 @@ var offCases = []testData{
 func TestOffCases(t *testing.T) {
 	rootLog := logger.New("module", "app")
 	for _, testCase := range offCases {
-		testCase.logTest(rootLog, t)
+		testCase.logTest(t, rootLog)
 		testCase.validate(t)
 	}
 }
@@ -203,7 +203,7 @@ var duplicateCases = []testData{
 func TestDuplicateCases(t *testing.T) {
 	rootLog := logger.New("module", "app")
 	for _, testCase := range duplicateCases {
-		testCase.logTest(rootLog, t)
+		testCase.logTest(t, rootLog)
 		testCase.validate(t)
 	}
 }
@@ -232,7 +232,7 @@ var contradictCases = []testData{
 func TestContradictCases(t *testing.T) {
 	rootLog := logger.New("module", "app")
 	for _, testCase := range contradictCases {
-		testCase.logTest(rootLog, t)
+		testCase.logTest(t, rootLog)
 		testCase.validate(t)
 	}
 }
@@ -253,12 +253,12 @@ var allCases = []testData{
 func TestAllCases(t *testing.T) {
 	rootLog := logger.New("module", "app")
 	for i, testCase := range allCases {
-		testCase.logTest(rootLog, t)
+		testCase.logTest(t, rootLog)
 		allCases[i] = testCase
 	}
 	rootLog = logger.New()
 	for i, testCase := range allCases {
-		testCase.logTest(rootLog, t)
+		testCase.logTest(t, rootLog)
 		allCases[i] = testCase
 	}
 	for _, testCase := range allCases {
@@ -284,7 +284,9 @@ func (c *testCounter) Log(r *logger.Record) error {
 	return nil
 }
 
-func (td *testData) logTest(rootLog logger.MultiLogger, t *testing.T) {
+func (td *testData) logTest(t *testing.T, rootLog logger.MultiLogger) {
+	t.Helper()
+
 	if td.tc == nil {
 		td.tc = &testCounter{}
 		counterInit(td.tc)
@@ -317,6 +319,8 @@ func (td *testData) runLogTest(log logger.MultiLogger) {
 }
 
 func (td *testData) validate(t *testing.T) {
+	t.Helper()
+
 	t.Logf("Test %#v expected %#v", td.tc, td.result)
 	assert.Equal(t, td.result.debug, td.tc.debug, "Debug failed "+strings.Join(td.config, " "))
 	assert.Equal(t, td.result.info, td.tc.info, "Info failed "+strings.Join(td.config, " "))

logger/terminal_format.go

@@ -197,10 +197,10 @@ func escapeString(s string) string {
 	return ret
 }
 
-// JsonFormatEx formats log records as JSON objects. If pretty is true,
+// JSONFormatEx formats log records as JSON objects. If pretty is true,
 // records will be pretty-printed. If lineSeparated is true, records
 // will be logged with a new line between each record.
-func JsonFormatEx(pretty, lineSeparated bool) LogFormat {
+func JSONFormatEx(pretty, lineSeparated bool) LogFormat {
 	jsonMarshal := json.Marshal
 	if pretty {
 		jsonMarshal = func(v interface{}) ([]byte, error) {

logger/utils.go

@@ -20,9 +20,9 @@ var (
 
 const (
 	// The test mode flag overrides the default log level and shows only errors.
-	TEST_MODE_FLAG = "testModeFlag"
+	TestModeFlag = "testModeFlag"
 	// The special use flag enables showing messages when the logger is setup.
-	SPECIAL_USE_FLAG = "specialUseFlag"
+	SpecialUseFlag = "specialUseFlag"
 )
 
 // Returns the logger for the name.

logger/wrap_handlers.go

@@ -9,6 +9,20 @@ import (
 	"time"
 )
 
+// Error is used for constant errors.
+type Error string
+
+// Error implements the error interface.
+func (e Error) Error() string {
+	return string(e)
+}
+
+const (
+	ErrNotFunc   Error = "not a function"
+	ErrTakesArgs Error = "takes arguments"
+	ErrNoReturn  Error = "no return value"
+)
+
 // Function handler wraps the declared function and returns the handler for it.
 func FuncHandler(fn func(r *Record) error) LogHandler {
 	return funcHandler(fn)
@@ -71,15 +85,15 @@ func evaluateLazy(lz Lazy) (interface{}, error) {
 	t := reflect.TypeOf(lz.Fn)
 
 	if t.Kind() != reflect.Func {
-		return nil, fmt.Errorf("INVALID_LAZY, not func: %+v", lz.Fn)
+		return nil, fmt.Errorf("%w %+v", ErrNotFunc, lz.Fn)
 	}
 
 	if t.NumIn() > 0 {
-		return nil, fmt.Errorf("INVALID_LAZY, func takes args: %+v", lz.Fn)
+		return nil, fmt.Errorf("%w %+v", ErrTakesArgs, lz.Fn)
 	}
 
 	if t.NumOut() == 0 {
-		return nil, fmt.Errorf("INVALID_LAZY, no func return val: %+v", lz.Fn)
+		return nil, fmt.Errorf("%w %+v", ErrNoReturn, lz.Fn)
 	}
 
 	value := reflect.ValueOf(lz.Fn)

model/command_config.go

@@ -28,6 +28,11 @@ const (
 	VERSION
 )
 
+const (
+	ErrImportInvalid  Error = "invalid import path, working dir is in GOPATH root"
+	ErrUnableToImport Error = "unable to determine import path from"
+)
+
 type (
 	// The Revel command type.
 	COMMAND int
@@ -110,7 +115,7 @@ func (c *CommandConfig) UpdateImportPath() error {
 						importPath = importPath[4:]
 					} else if importPath == "src" {
 						if c.Index != VERSION {
-							return fmt.Errorf("invalid import path, working dir is in GOPATH root")
+							return ErrImportInvalid
 						}
 						importPath = ""
 					}
@@ -122,7 +127,10 @@ func (c *CommandConfig) UpdateImportPath() error {
 
 	c.ImportPath = importPath
 	// We need the source root determined at this point to check the setversions
-	c.initAppFolder()
+	if err := c.initAppFolder(); err != nil {
+		utils.Logger.Error("Error initing app folder", "error", err)
+	}
+
 	utils.Logger.Info("Returned import path", "path", importPath)
 	if required && c.Index != NEW {
 		if err := c.SetVersions(); err != nil {
@@ -138,7 +146,7 @@ func (c *CommandConfig) UpdateImportPath() error {
 		return nil
 	}
 	if len(importPath) == 0 {
-		return fmt.Errorf("unable to determine import path from : %s", importPath)
+		return fmt.Errorf("%w: %s", ErrUnableToImport, importPath)
 	}
 	return nil
 }

model/revel_container.go

@@ -2,7 +2,6 @@
 package model
 
 import (
-	"errors"
 	"fmt"
 	"path/filepath"
 	"sort"
@@ -13,6 +12,24 @@ import (
 	"golang.org/x/tools/go/packages"
 )
 
+// Error is used for constant errors.
+type Error string
+
+// Error implements the error interface.
+func (e Error) Error() string {
+	return string(e)
+}
+
+const (
+	ErrNoApp       Error = "no app found at path"
+	ErrNoConfig    Error = "no config found at path"
+	ErrNotFound    Error = "not found"
+	ErrMissingCert Error = "no http.sslcert provided"
+	ErrMissingKey  Error = "no http.sslkey provided"
+	ErrNoFiles     Error = "no files found in import path"
+	ErrNoPackages  Error = "no packages found for import"
+)
+
 type (
 	// The container object for describing all Revels variables.
 	RevelContainer struct {
@@ -123,10 +140,10 @@ func NewRevelPaths(mode, importPath, appSrcPath string, callback RevelCallback)
 
 	// Sanity check , ensure app and conf paths exist
 	if !utils.DirExists(rp.AppPath) {
-		return rp, fmt.Errorf("no application found at path %s", rp.AppPath)
+		return rp, fmt.Errorf("%w: %s", ErrNoApp, rp.AppPath)
 	}
 	if !utils.DirExists(filepath.Join(rp.BasePath, "conf")) {
-		return rp, fmt.Errorf("no configuration found at path %s", filepath.Join(rp.BasePath, "conf"))
+		return rp, fmt.Errorf("%w: %s", ErrNoConfig, filepath.Join(rp.BasePath, "conf"))
 	}
 
 	rp.ViewsPath = filepath.Join(rp.AppPath, "views")
@@ -150,7 +167,7 @@ func NewRevelPaths(mode, importPath, appSrcPath string, callback RevelCallback)
 
 	rp.Config, err = config.LoadContext("app.conf", rp.ConfPaths)
 	if err != nil {
-		return rp, fmt.Errorf("unable to load configuration file %s", err)
+		return rp, fmt.Errorf("unable to load configuration file %w", err)
 	}
 
 	// Ensure that the selected runmode appears in app.conf.
@@ -159,7 +176,7 @@ func NewRevelPaths(mode, importPath, appSrcPath string, callback RevelCallback)
 		mode = config.DefaultSection
 	}
 	if !rp.Config.HasSection(mode) {
-		return rp, fmt.Errorf("app.conf: No mode found: %s %s", "run-mode", mode)
+		return rp, fmt.Errorf("app.conf: %w %s %s", ErrNotFound, "run-mode", mode)
 	}
 	rp.Config.SetSection(mode)
 
@@ -172,13 +189,14 @@ func NewRevelPaths(mode, importPath, appSrcPath string, callback RevelCallback)
 	rp.HTTPSslKey = rp.Config.StringDefault("http.sslkey", "")
 	if rp.HTTPSsl {
 		if rp.HTTPSslCert == "" {
-			return rp, errors.New("no http.sslcert provided")
+			return rp, ErrMissingCert
 		}
+
 		if rp.HTTPSslKey == "" {
-			return rp, errors.New("no http.sslkey provided")
+			return rp, ErrMissingKey
 		}
 	}
-	//
+
 	rp.AppName = rp.Config.StringDefault("app.name", "(not set)")
 	rp.AppRoot = rp.Config.StringDefault("app.root", "")
 	rp.CookiePrefix = rp.Config.StringDefault("cookie.prefix", "REVEL")
@@ -201,7 +219,7 @@ func NewRevelPaths(mode, importPath, appSrcPath string, callback RevelCallback)
 func (rp *RevelContainer) LoadMimeConfig() (err error) {
 	rp.MimeConfig, err = config.LoadContext("mime-types.conf", rp.ConfPaths)
 	if err != nil {
-		return fmt.Errorf("failed to load mime type config: %s %s", "error", err)
+		return fmt.Errorf("failed to load mime type config: %s %w", "error", err)
 	}
 	return
 }
@@ -226,10 +244,14 @@ func (rp *RevelContainer) loadModules(callback RevelCallback) (err error) {
 		modulePath, err := rp.ResolveImportPath(moduleImportPath)
 		if err != nil {
 			utils.Logger.Info("Missing module ", "module_import_path", moduleImportPath, "error", err)
-			callback.PackageResolver(moduleImportPath)
+
+			if err := callback.PackageResolver(moduleImportPath); err != nil {
+				return fmt.Errorf("failed to resolve package %w", err)
+			}
+
 			modulePath, err = rp.ResolveImportPath(moduleImportPath)
 			if err != nil {
-				return fmt.Errorf("failed to load module.  Import of path failed %s:%s %s:%s ", "modulePath", moduleImportPath, "error", err)
+				return fmt.Errorf("failed to load module.  Import of path failed %s:%s %s:%w ", "modulePath", moduleImportPath, "error", err)
 			}
 		}
 		// Drop anything between module.???.<name of module>
@@ -281,7 +303,7 @@ func (rp *RevelContainer) ResolveImportPath(importPath string) (string, error) {
 
 	pkgs, err := packages.Load(config, importPath)
 	if len(pkgs) == 0 {
-		return "", errors.New("No packages found for import " + importPath + " using app path " + rp.AppPath)
+		return "", fmt.Errorf("%w %s using app path %s", ErrNoPackages, importPath, rp.AppPath)
 	}
 	//	modPkg, err := build.Import(importPath, rp.AppPath, build.FindOnly)
 	if err != nil {
@@ -290,5 +312,5 @@ func (rp *RevelContainer) ResolveImportPath(importPath string) (string, error) {
 	if len(pkgs[0].GoFiles) > 0 {
 		return filepath.Dir(pkgs[0].GoFiles[0]), nil
 	}
-	return pkgs[0].PkgPath, errors.New("No files found in import path " + importPath)
+	return pkgs[0].PkgPath, fmt.Errorf("%w: %s", ErrNoFiles, importPath)
 }

model/type_expr.go

@@ -20,7 +20,7 @@ func NewTypeExprFromData(expr, pkgName string, pkgIndex int, valid bool) TypeExp
 
 // NewTypeExpr returns the syntactic expression for referencing this type in Go.
 func NewTypeExprFromAst(pkgName string, expr ast.Expr) TypeExpr {
-	error := ""
+	err := ""
 	switch t := expr.(type) {
 	case *ast.Ident:
 		if IsBuiltinType(t.Name) {
@@ -41,14 +41,14 @@ func NewTypeExprFromAst(pkgName string, expr ast.Expr) TypeExpr {
 			e := NewTypeExprFromAst(pkgName, t.Value)
 			return NewTypeExprFromData("map["+identKey.Name+"]"+e.Expr, e.PkgName, e.pkgIndex+len("map["+identKey.Name+"]"), e.Valid)
 		}
-		error = fmt.Sprintf("Failed to generate name for Map field :%v. Make sure the field name is valid.", t.Key)
+		err = fmt.Sprintf("Failed to generate name for Map field :%v. Make sure the field name is valid.", t.Key)
 	case *ast.Ellipsis:
 		e := NewTypeExprFromAst(pkgName, t.Elt)
 		return NewTypeExprFromData("[]"+e.Expr, e.PkgName, e.pkgIndex+2, e.Valid)
 	default:
-		error = fmt.Sprintf("Failed to generate name for field: %v Package: %v. Make sure the field name is valid.", expr, pkgName)
+		err = fmt.Sprintf("Failed to generate name for field: %v Package: %v. Make sure the field name is valid.", expr, pkgName)
 	}
-	return NewTypeExprFromData(error, "", 0, false)
+	return NewTypeExprFromData(err, "", 0, false)
 }
 
 // TypeName returns the fully-qualified type name for this expression.
@@ -61,7 +61,7 @@ func (e TypeExpr) TypeName(pkgOverride string) string {
 	return e.Expr[:e.pkgIndex] + pkgName + "." + e.Expr[e.pkgIndex:]
 }
 
-var builtInTypes = map[string]struct{}{
+var builtInTypes = map[string]struct{}{ //nolint:gochecknoglobals
 	"bool":       {},
 	"byte":       {},
 	"complex128": {},

parser/reflect.go

@@ -8,6 +8,7 @@ package parser
 // It catalogs the controllers, their methods, and their arguments.
 
 import (
+	"errors"
 	"go/ast"
 	"go/parser"
 	"go/scanner"
@@ -83,7 +84,8 @@ func (pc *processContainer) processPath(path string, info os.FileInfo, err error
 		0)
 
 	if err != nil {
-		if errList, ok := err.(scanner.ErrorList); ok {
+		var errList scanner.ErrorList
+		if errors.As(err, &errList) {
 			pos := errList[0].Pos
 			newError := &utils.SourceError{
 				SourceType:  ".go source",

parser2/source_processor.go

@@ -1,6 +1,7 @@
 package parser2
 
 import (
+	"errors"
 	"go/ast"
 	"go/parser"
 	"go/scanner"
@@ -150,7 +151,8 @@ func (s *SourceProcessor) processPath(path string, info os.FileInfo, err error)
 		0)
 
 	if err != nil {
-		if errList, ok := err.(scanner.ErrorList); ok {
+		var errList scanner.ErrorList
+		if errors.As(err, &errList) {
 			pos := errList[0].Pos
 			newError := &utils.SourceError{
 				SourceType:  ".go source",

revel/build_test.go

@@ -19,7 +19,7 @@ func TestBuild(t *testing.T) {
 	t.Run("Build", func(t *testing.T) {
 		a := assert.New(t)
 		c := newApp("build-test", model.NEW, nil, a)
-		main.Commands[model.NEW].RunWith(c)
+		a.Nil(main.Commands[model.NEW].RunWith(c), "failed to run new")
 		c.Index = model.BUILD
 		c.Build.TargetPath = filepath.Join(gopath, "build-test", "target")
 		c.Build.ImportPath = c.ImportPath
@@ -34,7 +34,7 @@ func TestBuild(t *testing.T) {
 			"build-test-WithFlags/app.AppVersion=SomeValue",
 			"build-test-WithFlags/app.SomeOtherValue=SomeValue",
 		}
-		main.Commands[model.NEW].RunWith(c)
+		a.Nil(main.Commands[model.NEW].RunWith(c), "failed to run new")
 		c.Index = model.BUILD
 		c.Build.TargetPath = filepath.Join(gopath, "build-test", "target")
 		c.Build.ImportPath = c.ImportPath

revel/clean_test.go

@@ -19,9 +19,12 @@ func TestClean(t *testing.T) {
 	t.Run("Clean", func(t *testing.T) {
 		a := assert.New(t)
 		c := newApp("clean-test", model.NEW, nil, a)
-		main.Commands[model.NEW].RunWith(c)
+
+		a.Nil(main.Commands[model.NEW].RunWith(c), "failed to run new")
+
 		c.Index = model.TEST
-		main.Commands[model.TEST].RunWith(c)
+		a.Nil(main.Commands[model.TEST].RunWith(c), "failed to run test")
+
 		a.True(utils.Exists(filepath.Join(gopath, "clean-test", "app", "tmp", "main.go")),
 			"Missing main from path "+filepath.Join(gopath, "clean-test", "app", "tmp", "main.go"))
 		c.Clean.ImportPath = c.ImportPath

revel/command_test.go

@@ -33,7 +33,10 @@ func setup(suffix string, a *assert.Assertions) string {
 	// But if you change into that directory and read the current folder it is
 	// /private/var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/revel-test/revel-test-build
 	// So to make this work on darwin this code was added
-	os.Chdir(gopath)
+	if err := os.Chdir(gopath); err != nil {
+		panic(err)
+	}
+
 	newwd, _ := os.Getwd()
 	gopath = newwd
 	defaultBuild := build.Default

revel/new.go

@@ -18,6 +18,8 @@ import (
 	"github.com/revel/cmd/utils"
 )
 
+const ErrNoSkeleton Error = "failed to find skeleton in filepath"
+
 var cmdNew = &Command{
 	UsageLine: "new -i [path] -s [skeleton]",
 	Short:     "create a skeleton Revel application",
@@ -92,7 +94,9 @@ func newApp(c *model.CommandConfig) (err error) {
 	// This kicked off the download of the revel app, not needed for vendor
 	if !c.Vendored {
 		// At this point the versions can be set
-		c.SetVersions()
+		if err = c.SetVersions(); err != nil {
+			return
+		}
 	}
 
 	// copy files to new app directory
@@ -114,11 +118,18 @@ func newApp(c *model.CommandConfig) (err error) {
 		// Need to prep the run command
 		c.Run.ImportPath = c.ImportPath
 		updateRunConfig(c, nil)
-		c.UpdateImportPath()
-		runApp(c)
+
+		if err = c.UpdateImportPath(); err != nil {
+			return
+		}
+
+		if err = runApp(c); err != nil {
+			return
+		}
 	} else {
 		fmt.Fprintln(os.Stdout, "\nYou can run it with:\n   revel run -a ", c.ImportPath)
 	}
+
 	return
 }
 
@@ -129,13 +140,16 @@ func createModVendor(c *model.CommandConfig) (err error) {
 	utils.CmdInit(goModCmd, !c.Vendored, c.AppPath)
 
 	utils.Logger.Info("Exec:", "args", goModCmd.Args, "env", goModCmd.Env, "workingdir", goModCmd.Dir)
+
 	getOutput, err := goModCmd.CombinedOutput()
 	if c.New.Callback != nil {
 		err = c.New.Callback()
 	}
+
 	if err != nil {
 		return utils.NewBuildIfError(err, string(getOutput))
 	}
+
 	return
 }
 
@@ -206,7 +220,7 @@ func setSkeletonPath(c *model.CommandConfig) (err error) {
 			c.New.SkeletonPath = fullpath
 			utils.Logger.Info("Set skeleton path to ", fullpath)
 			if !utils.DirExists(fullpath) {
-				return fmt.Errorf("failed to find skeleton in filepath %s %s", fullpath, sp.String())
+				return fmt.Errorf("%w %s %s", ErrNoSkeleton, fullpath, sp.String())
 			}
 		case "git":
 			fallthrough

revel/package_test.go

@@ -17,7 +17,7 @@ func TestPackage(t *testing.T) {
 	t.Run("Package", func(t *testing.T) {
 		a := assert.New(t)
 		c := newApp("package-test", model.NEW, nil, a)
-		main.Commands[model.NEW].RunWith(c)
+		a.Nil(main.Commands[model.NEW].RunWith(c), "failed to run new")
 		c.Index = model.PACKAGE
 		c.Package.ImportPath = c.ImportPath
 		a.Nil(main.Commands[model.PACKAGE].RunWith(c), "Failed to run package-test")

revel/revel.go

@@ -22,6 +22,16 @@ import (
 	"github.com/revel/cmd/utils"
 )
 
+// Error is used for constant errors.
+type Error string
+
+// Error implements the error interface.
+func (e Error) Error() string {
+	return string(e)
+}
+
+const ErrInvalidCommandLine Error = "invalid command line arguments"
+
 const (
 	// RevelCmdImportPath Revel framework cmd tool import path.
 	RevelSkeletonsImportPath = "github.com/revel/skeletons"
@@ -138,7 +148,7 @@ func ParseArgs(c *model.CommandConfig, parser *flags.Parser, args []string) (err
 	if !Commands[c.Index].UpdateConfig(c, extraArgs) {
 		buffer := &bytes.Buffer{}
 		parser.WriteHelp(buffer)
-		err = fmt.Errorf("invalid command line arguments %v\n%s", extraArgs, buffer.String())
+		err = fmt.Errorf("%w %v\n%s", ErrInvalidCommandLine, extraArgs, buffer.String())
 	}
 
 	return

revel/version.go

@@ -82,7 +82,9 @@ func (v *VersionCommand) RunWith(c *model.CommandConfig) (err error) {
 	if e := cmd.Start(); e != nil {
 		fmt.Println("Go command error ", e)
 	} else {
-		cmd.Wait()
+		if err = cmd.Wait(); err != nil {
+			return
+		}
 	}
 
 	return
@@ -188,7 +190,9 @@ func (v *VersionCommand) versionFromBytes(sourceStream []byte) (version *model.V
 			r := spec.Values[0].(*ast.BasicLit)
 			switch spec.Names[0].Name {
 			case "Version":
-				version.ParseVersion(strings.ReplaceAll(r.Value, `"`, ""))
+				if err = version.ParseVersion(strings.ReplaceAll(r.Value, `"`, "")); err != nil {
+					return
+				}
 			case "BuildDate":
 				version.BuildDate = r.Value
 			case "MinimumGoVersion":
@@ -202,7 +206,12 @@ func (v *VersionCommand) versionFromBytes(sourceStream []byte) (version *model.V
 // Fetch the local version of revel from the file system.
 func (v *VersionCommand) updateLocalVersions() {
 	v.cmdVersion = &model.Version{}
-	v.cmdVersion.ParseVersion(cmd.Version)
+
+	if err := v.cmdVersion.ParseVersion(cmd.Version); err != nil {
+		utils.Logger.Warn("Error parsing version", "error", err, "version", cmd.Version)
+		return
+	}
+
 	v.cmdVersion.BuildDate = cmd.BuildDate
 	v.cmdVersion.MinGoVersion = cmd.MinimumGoVersion
 

revel/version_test.go

@@ -1,6 +1,7 @@
 package main_test
 
 import (
+	"errors"
 	"os"
 	"path/filepath"
 	"testing"
@@ -34,8 +35,9 @@ func TestVersion(t *testing.T) {
 		c.Version.ImportPath = c.ImportPath
 		a.Nil(main.Commands[model.VERSION].RunWith(c), "Failed to run version-test")
 	})
+
 	if !t.Failed() {
-		if err := os.RemoveAll(gopath); err != nil && err != os.ErrNotExist {
+		if err := os.RemoveAll(gopath); err != nil && !errors.Is(err, os.ErrNotExist) {
 			a.Fail("Failed to remove test path", err.Error())
 		}
 	}

utils/build_error.go

@@ -1,6 +1,7 @@
 package utils
 
 import (
+	"errors"
 	"fmt"
 	"regexp"
 	"strconv"
@@ -30,7 +31,8 @@ func NewBuildError(message string, args ...interface{}) (b *BuildError) {
 // Returns a new BuildError if err is not nil.
 func NewBuildIfError(err error, message string, args ...interface{}) (b error) {
 	if err != nil {
-		if berr, ok := err.(*BuildError); ok {
+		var berr *BuildError
+		if errors.As(err, &berr) {
 			// This is already a build error so just append the args
 			berr.Args = append(berr.Args, args...)
 			return berr
@@ -50,16 +52,16 @@ func (b *BuildError) Error() string {
 
 // Parse the output of the "go build" command.
 // Return a detailed Error.
-func NewCompileError(importPath, errorLink string, error error) *SourceError {
+func NewCompileError(importPath, errorLink string, err error) *SourceError {
 	// Get the stack from the error
 
 	errorMatch := regexp.MustCompile(`(?m)^([^:#]+):(\d+):(\d+:)? (.*)$`).
-		FindSubmatch([]byte(error.Error()))
+		FindSubmatch([]byte(err.Error()))
 	if errorMatch == nil {
-		errorMatch = regexp.MustCompile(`(?m)^(.*?):(\d+):\s(.*?)$`).FindSubmatch([]byte(error.Error()))
+		errorMatch = regexp.MustCompile(`(?m)^(.*?):(\d+):\s(.*?)$`).FindSubmatch([]byte(err.Error()))
 
 		if errorMatch == nil {
-			Logger.Error("Failed to parse build errors", "error", error)
+			Logger.Error("Failed to parse build errors", "error", err)
 			return &SourceError{
 				SourceType:  "Go code",
 				Title:       "Go Compilation Error",
@@ -69,7 +71,7 @@ func NewCompileError(importPath, errorLink string, error error) *SourceError {
 
 		errorMatch = append(errorMatch, errorMatch[3])
 
-		Logger.Error("Build errors", "errors", error)
+		Logger.Error("Build errors", "errors", err)
 	}
 
 	// Read the source for the offending file.

utils/file.go

@@ -150,8 +150,9 @@ func MustChmod(filename string, mode os.FileMode) {
 
 // Called if panic.
 func PanicOnError(err error, msg string) {
-	if revErr, ok := err.(*SourceError); (ok && revErr != nil) || (!ok && err != nil) {
-		Logger.Panicf("Abort: %s: %s %s", msg, revErr, err)
+	var serr *SourceError
+	if (errors.As(err, &serr) && serr != nil) || err != nil {
+		Logger.Panicf("Abort: %s: %s %s", msg, serr, err)
 	}
 }
 
@@ -348,9 +349,17 @@ func FindSrcPaths(appPath string, packageList []string, packageResolver func(pkg
 	return
 }
 
+// Error is used for constant errors.
+type Error string
+
+// Error implements the error interface.
+func (e Error) Error() string {
+	return string(e)
+}
+
 var (
-	NO_APP_FOUND   = errors.New("no app found")
-	NO_REVEL_FOUND = errors.New("no revel found")
+	ErrNoApp   Error = "no app found"
+	ErrNoRevel Error = "no revel found"
 )
 
 // Find the full source dir for the import path, uses the build.Default.GOPATH to search for the directory.
@@ -387,9 +396,9 @@ func findSrcPaths(appPath string, packagesList []string) (sourcePathsmap map[str
 		}
 		if !found {
 			if packageName == "github.com/revel/revel" {
-				err = NO_REVEL_FOUND
+				err = ErrNoRevel
 			} else {
-				err = NO_APP_FOUND
+				err = ErrNoApp
 			}
 			missingList = append(missingList, packageName)
 		}

utils/log.go

@@ -33,7 +33,7 @@ func InitLogger(basePath string, logLevel logger.LogLevel) {
 
 // This function is to throw a panic that may be caught by the packger so it can perform the needed
 // imports.
-func Retry(format string, args ...interface{}) {
+func Retryf(format string, args ...interface{}) {
 	// Ensure the user's command prompt starts on the next line.
 	if !strings.HasSuffix(format, "\n") {
 		format += "\n"

version.go

@@ -5,7 +5,7 @@
 package cmd
 
 const (
-	// Version current Revel version
+	// Version current Revel version.
 	Version = "1.1.0-dev"
 
 	// BuildDate latest commit/release date.

watcher/watcher.go

@@ -46,16 +46,16 @@ type Watcher struct {
 	timerMutex          *sync.Mutex // A mutex to prevent concurrent updates
 	refreshChannel      chan *utils.SourceError
 	refreshChannelCount int
-	refreshTimerMS      time.Duration // The number of milliseconds between refreshing builds
+	refreshInterval     time.Duration // The interval between refreshing builds
 }
 
 // Creates a new watched based on the container.
 func NewWatcher(paths *model.RevelContainer, eagerRefresh bool) *Watcher {
 	return &Watcher{
-		forceRefresh:   false,
-		lastError:      -1,
-		paths:          paths,
-		refreshTimerMS: time.Duration(paths.Config.IntDefault("watch.rebuild.delay", 1000)),
+		forceRefresh:    false,
+		lastError:       -1,
+		paths:           paths,
+		refreshInterval: time.Duration(paths.Config.IntDefault("watch.rebuild.delay", 1000)) * time.Millisecond,
 		eagerRefresh: eagerRefresh ||
 			paths.DevMode &&
 				paths.Config.BoolDefault("watch", true) &&
@@ -163,7 +163,10 @@ func (w *Watcher) NotifyWhenUpdated(listener Listener, watcher *fsnotify.Watcher
 				} else {
 					// Run refresh in parallel
 					go func() {
-						w.notifyInProcess(listener)
+						if err := w.notifyInProcess(listener); err != nil {
+							utils.Logger.Error("failed to notify",
+								"error", err)
+						}
 					}()
 				}
 			}
@@ -238,11 +241,11 @@ func (w *Watcher) notifyInProcess(listener Listener) (err *utils.SourceError) {
 		w.forceRefresh = true
 		if w.refreshTimer != nil {
 			utils.Logger.Info("Found existing timer running, resetting")
-			w.refreshTimer.Reset(time.Millisecond * w.refreshTimerMS)
+			w.refreshTimer.Reset(w.refreshInterval)
 			shouldReturn = true
 			w.refreshChannelCount++
 		} else {
-			w.refreshTimer = time.NewTimer(time.Millisecond * w.refreshTimerMS)
+			w.refreshTimer = time.NewTimer(w.refreshInterval)
 		}
 	}()