Extract required filter from pongo2-addons

Current version of pongo2-addons only works with master branch and is
not versioned. Also current version of prongo2-addons contains errors
related to markdown parser which is not used within mondash.

Signed-off-by: Knut Ahlers <knut@ahlers.me>

Gopkg.lock

@@ -9,7 +9,7 @@
 
 [[projects]]
   name = "github.com/aws/aws-sdk-go"
-  packages = ["aws","aws/awserr","aws/awsutil","aws/client","aws/client/metadata","aws/credentials","aws/endpoints","aws/request","aws/signer/v4","internal/shareddefaults","private/protocol","private/protocol/query","private/protocol/query/queryutil","private/protocol/rest","private/protocol/restxml","private/protocol/xml/xmlutil","service/s3"]
+  packages = ["aws","aws/awserr","aws/awsutil","aws/client","aws/client/metadata","aws/corehandlers","aws/credentials","aws/credentials/ec2rolecreds","aws/credentials/endpointcreds","aws/credentials/stscreds","aws/defaults","aws/ec2metadata","aws/endpoints","aws/request","aws/session","aws/signer/v4","internal/shareddefaults","private/protocol","private/protocol/query","private/protocol/query/queryutil","private/protocol/rest","private/protocol/restxml","private/protocol/xml/xmlutil","service/s3","service/sts"]
   revision = "991fe2497a95d757bb53f95cbcebf3d26134c9fe"
   version = "v1.12.32"
 
@@ -105,6 +105,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "2544efe6d7c15494a53f84f4639759ad68c124eadbd0608faebc66d767db2d3c"
+  inputs-digest = "d6eacc94cd9bd400bffbca99280d82e6e82fad1f84460edb4d4fc0fc78df83f1"
   solver-name = "gps-cdcl"
   solver-version = 1

filters/filter.go

@@ -1,9 +1,15 @@
 package filters
 
-import "github.com/flosch/pongo2"
+import (
+	"time"
+
+	humanize "github.com/flosch/go-humanize"
+	"github.com/flosch/pongo2"
+)
 
 func init() {
 	pongo2.RegisterFilter("lastNItems", filterLastNItems)
+	pongo2.RegisterFilter("naturaltime", filterTimeuntilTimesince)
 }
 
 func filterLastNItems(in *pongo2.Value, param *pongo2.Value) (*pongo2.Value, *pongo2.Error) {
@@ -18,3 +24,27 @@ func filterLastNItems(in *pongo2.Value, param *pongo2.Value) (*pongo2.Value, *po
 
 	return in.Slice(from, in.Len()), nil
 }
+
+func filterTimeuntilTimesince(in *pongo2.Value, param *pongo2.Value) (*pongo2.Value, *pongo2.Error) {
+	basetime, isTime := in.Interface().(time.Time)
+	if !isTime {
+		return nil, &pongo2.Error{
+			Sender:   "filter:timeuntil/timesince",
+			ErrorMsg: "time-value is not a time.Time-instance",
+		}
+	}
+	var paramtime time.Time
+	if !param.IsNil() {
+		paramtime, isTime = param.Interface().(time.Time)
+		if !isTime {
+			return nil, &pongo2.Error{
+				Sender:   "filter:timeuntil/timesince",
+				ErrorMsg: "time-parameter is not a time.Time-instance",
+			}
+		}
+	} else {
+		paramtime = time.Now()
+	}
+
+	return pongo2.AsValue(humanize.TimeDuration(basetime.Sub(paramtime))), nil
+}

main.go

@@ -14,7 +14,6 @@ import (
 	"github.com/gorilla/mux"
 
 	_ "github.com/Luzifer/mondash/filters"
-	_ "github.com/flosch/pongo2-addons"
 )
 
 var (