explain how to include "line" in "all" filter #129

HELP.md

@@ -6,8 +6,9 @@ Extrakto uses fzf. You only need to type a few keys to find your selection with
 
 - Press *ctrl-f* to change to the next filter mode (*filter_key*)
   - *word*, the default filter allows you to select words (default min length=5)
-  - *all*, runs all filters and allows you select quotes, url, paths, etc. \
-    You can define your own filters as well.
+  - *all*, runs all(*) filters and allows you select quotes, url, paths, etc. \
+    You can define your own filters as well as selecting which are included in \
+    the all selection (see extrakto.conf).
   - *line*, select full lines
 
 - Press *ctrl-g* to change the grab area (see *grab_key* and configuration)

extrakto.conf

@@ -57,3 +57,10 @@ alt2: "([^"\n\r]+)"
 [s-quote]
 regex: ('[^'\n\r]+')
 alt2: '([^'\n\r]+)'
+
+# note that "line" is a special filter that is not handled here for performance reasons
+# if you want to include it in the 'all' filter you can define it like this in your
+# config file:
+# [line]
+# regex: ([^\n\r]+?)\s+\r?\n
+