3 files changed, 61 insertions, 28 deletions

diff --git a/gopher/gophermap/extended.go b/gopher/gophermap/extended.go
index 8e48e99..7d64fe0 100644
--- a/gopher/gophermap/extended.go
+++ b/gopher/gophermap/extended.go
@@ -3,6 +3,7 @@ package gophermap
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"errors"
 	"fmt"
 	"io"
@@ -14,6 +15,7 @@ import (
 	"strconv"
 	"strings"
 
+	sr "tildegit.org/tjp/sliderule"
 	"tildegit.org/tjp/sliderule/gopher"
 	"tildegit.org/tjp/sliderule/internal"
 	"tildegit.org/tjp/sliderule/internal/types"
@@ -298,3 +300,33 @@ func openExtended(path string, location *url.URL, settings FileSystemSettings) (
 
 	return ParseExtended(file, location)
 }
+
+func ExtendMiddleware(fsroot, urlroot string, settings *FileSystemSettings) sr.Middleware {
+	return sr.Middleware(func(handler sr.Handler) sr.Handler {
+		return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response {
+			response := handler.Handle(ctx, request)
+
+			if !settings.ParseExtended || response.Status != gopher.MenuType {
+				return response
+			}
+
+			defer func() { _ = response.Close() }()
+
+			edoc, err := ParseExtended(response.Body, request.URL)
+			if err != nil {
+				return gopher.Error(err).Response()
+			}
+
+			fpath := strings.TrimPrefix(request.Path, urlroot)
+			fpath = strings.Trim(fpath, "/")
+			fpath = filepath.Join(fsroot, fpath)
+
+			doc, _, err := edoc.Compatible(filepath.Dir(fpath), *settings)
+			if err != nil {
+				return gopher.Error(err).Response()
+			}
+
+			return doc.Response()
+		})
+	})
+}
diff --git a/gopher/protocol.go b/gopher/protocol.go
new file mode 100644
index 0000000..22ccd56
--- /dev/null
+++ b/gopher/protocol.go
@@ -0,0 +1,27 @@
+package gopher
+
+import (
+	"io"
+	"net/url"
+
+	"tildegit.org/tjp/sliderule/internal/types"
+)
+
+type proto struct{}
+
+func (p proto) TemporaryRedirect(u *url.URL) *types.Response { return nil }
+func (p proto) PermanentRedirect(u *url.URL) *types.Response { return nil }
+
+func (p proto) TemporaryServerError(err error) *types.Response { return Error(err).Response() }
+func (p proto) PermanentServerError(err error) *types.Response { return Error(err).Response() }
+func (p proto) CGIFailure(err error) *types.Response           { return Error(err).Response() }
+
+func (p proto) Success(filename string, body io.Reader) *types.Response {
+	return File(GuessItemType(filename), body)
+}
+
+func (p proto) ParseResponse(input io.Reader) (*types.Response, error) {
+	return &types.Response{Body: input, Status: MenuType}, nil
+}
+
+var ServerProtocol types.ServerProtocol = proto{}
diff --git a/gopher/response.go b/gopher/response.go
index 269176f..3651e07 100644
--- a/gopher/response.go
+++ b/gopher/response.go
@@ -5,12 +5,11 @@ import (
 	"fmt"
 	"io"
 	"mime"
-	"os"
 	"path"
 	"strings"
 	"sync"
-	"unicode/utf8"
 
+	"tildegit.org/tjp/sliderule/internal"
 	"tildegit.org/tjp/sliderule/internal/types"
 )
 
@@ -207,34 +206,9 @@ func GuessItemType(filepath string) types.Status {
 		return TextFileType
 	}
 
-	if contentsAreText(filepath) {
+	if internal.ContentsAreText(filepath) {
 		return TextFileType
 	}
 
 	return BinaryFileType
 }
-
-func contentsAreText(filepath string) bool {
-	f, err := os.Open(filepath)
-	if err != nil {
-		return false
-	}
-	defer func() { _ = f.Close() }()
-
-	var buf [1024]byte
-	n, err := f.Read(buf[:])
-	if err != nil {
-		return false
-	}
-
-	for i, c := range string(buf[:n]) {
-		if i+utf8.UTFMax > n {
-			// incomplete last char
-			break
-		}
-		if c == 0xFFFD || c < ' ' && c != '\n' && c != '\t' && c != '\f' {
-			return false
-		}
-	}
-	return true
-}