support process substitution

src/lib/init_import.sh

@@ -17,6 +17,15 @@ function init_import() {
             files[$i]="${tmpdir}/${files[$i]//[^A-Za-z0-9._-]/_}"
         fi
     done
+    # read pipes if name starts with /dev/fd
+    for i in "${!files[@]}"; do
+        if [[ ${files[$i]} == "/dev/fd"* ]]; then
+            if ! cat "${files[$i]}" >"${tmpdir}/${files[$i]//[^A-Za-z0-9._-]/_}"; then
+                error "reading of ${files[$i]} failed!"
+            fi
+            files[$i]="${tmpdir}/${files[$i]//[^A-Za-z0-9._-]/_}"
+        fi
+    done
     # create a zip archive if there are multiple files
     if [[ ${#files[@]} -gt 1 ]]; then
         file="$tmpdir/Untitled.zip"