fixed pongo2 replaceFilter

.air.toml

@@ -0,0 +1,36 @@
+root = "."
+testdata_dir = "testdata"
+tmp_dir = "tmp"
+
+[build]
+  bin = "./tmp/main"
+  cmd = "go build -o ./tmp/main ./cmd/mark2web"
+  delay = 1000
+  exclude_dir = ["assets", "tmp", "vendor", "testdata"]
+  exclude_file = []
+  exclude_regex = ["_test.go"]
+  exclude_unchanged = false
+  follow_symlink = false
+  full_bin = ""
+  include_dir = []
+  include_ext = ["go", "tpl", "tmpl", "html"]
+  kill_delay = "0s"
+  log = "build-errors.log"
+  send_interrupt = false
+  stop_on_error = true
+
+[color]
+  app = ""
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "cyan"
+
+[log]
+  time = false
+
+[misc]
+  clean_on_exit = false
+
+[screen]
+  clear_on_rebuild = false

pkg/filter/init.go

@@ -8,7 +8,10 @@ import (
 func init() {
 	err := pongo2.ReplaceFilter("markdown", MarkdownFilter)
 	if err != nil {
-		panic(err)
+		err = pongo2.RegisterFilter("markdown", MarkdownFilter)
+		if err != nil {
+			panic(err)
+		}
 	}
 
 	newFilters := map[string]pongo2.FilterFunction{

tmp/build-errors.log

@@ -0,0 +1 @@
+exit status 1