commands: Show server error info in browser

The main item in this commit is showing of errors with a file context when running `hugo server`.

This can be turned off: `hugo server --disableBrowserError` (can also be set in `config.toml`).

But to get there, the error handling in Hugo needed a revision. There are some items left TODO for commits soon to follow, most notable errors in content and config files.

Fixes #5284
Fixes #5290
See #5325
See #5324

tpl/fmt/fmt.go

@@ -16,12 +16,13 @@ package fmt
 import (
 	_fmt "fmt"
 
+	"github.com/gohugoio/hugo/deps"
 	"github.com/gohugoio/hugo/helpers"
 )
 
 // New returns a new instance of the fmt-namespaced template functions.
-func New() *Namespace {
-	return &Namespace{helpers.NewDistinctErrorLogger()}
+func New(d *deps.Deps) *Namespace {
+	return &Namespace{helpers.NewDistinctLogger(d.Log.ERROR)}
 }
 
 // Namespace provides template functions for the "fmt" namespace.

tpl/fmt/init.go

@@ -22,7 +22,7 @@ const name = "fmt"
 
 func init() {
 	f := func(d *deps.Deps) *internal.TemplateFuncsNamespace {
-		ctx := New()
+		ctx := New(d)
 
 		ns := &internal.TemplateFuncsNamespace{
 			Name:    name,

tpl/fmt/init_test.go

@@ -16,6 +16,7 @@ package fmt
 import (
 	"testing"
 
+	"github.com/gohugoio/hugo/common/loggers"
 	"github.com/gohugoio/hugo/deps"
 	"github.com/gohugoio/hugo/tpl/internal"
 	"github.com/stretchr/testify/require"
@@ -26,7 +27,7 @@ func TestInit(t *testing.T) {
 	var ns *internal.TemplateFuncsNamespace
 
 	for _, nsf := range internal.TemplateFuncsNamespaceRegistry {
-		ns = nsf(&deps.Deps{})
+		ns = nsf(&deps.Deps{Log: loggers.NewErrorLogger()})
 		if ns.Name == name {
 			found = true
 			break