diff --git a/README b/README
index 3ada0c5..2cf78df 100644
--- a/README
+++ b/README
@@ -12,8 +12,7 @@ ________________________________________________________________________________
 * really nice escape sequence handling for keys which emit '\033[<stuff>'. Not
   based on read timeouts. Based on tracking position within sequences.
 
-* has no dependencies other than a POSIX shell and POSIX coreutils (for printf,
-  [, etc if not builtin).
+* no dependencies other than a POSIX shell and POSIX (printf, dd, [ and stty)
 
 * movement uses vim-like keybinds (hjkl).
 
@@ -26,8 +25,8 @@ ________________________________________________________________________________
 - [x] store list somehow.
 - [ ] search
 - [ ] prompts
-- [ ] opener
-- [ ] resize (POSIX shell winch is not asynchronous during read + SIGWINCH?)
+- [x] opener
+- [x] resize
 
 
 keybinds
@@ -40,3 +39,77 @@ h - go up level
 g - go to top
 G - go to bottom
 q - quit
+
+
+opener
+________________________________________________________________________________
+
+opening files in different applications (based on mime-type or file extension)
+can be achieved via an environment variable (SHFM_OPENER) set to the location of
+a small external script. The default for all files will be '$EDITOR' (and if
+that is unset, 'vi').
+
+The script receives a single argument, the full path to the selected file.
+The opener script is also useful on the command-line.
+
+Example scripts:
+
+    #!/bin/sh -e
+    #
+    # open file in application based on file extension
+
+    case $1 in
+        *.mp3|*.flac|*.wav)
+            mpv --no-video "$1"
+        ;;
+
+        *.mp4|*.mkv|*.webm)
+            mpv "$1"
+        ;;
+
+        *.png|*.gif||*.jpg|*.jpe|*.jpeg)
+            gimp "$1"
+        ;;
+
+        *.html|*.pdf)
+            firefox "$1"
+        ;;
+
+        # all other files
+        *)
+            "${EDITOR:=vi}" "$1"
+        ;;
+    esac
+
+
+    #!/bin/sh -e
+    #
+    # open file in application based on mime-type
+
+    mime_type=$(file -bi)
+
+    case $mime_type in
+        audio/*)
+           mpv --no-video "$1"
+        ;;
+
+        video/*)
+            mpv "$1"
+        ;;
+
+        image/*)
+            gimp "$1"
+        ;;
+
+        text/html*|application/pdf*)
+            firefox "$1"
+        ;;
+
+        text/*|)
+            "${EDITOR:=vi}" "$1"
+        ;;
+
+        *)
+            printf 'unknown mime-type %s\n' "$mime_type"
+        ;;
+    esac
diff --git a/shfm b/shfm
index 9c3a5c8..f9ba568 100755
--- a/shfm
+++ b/shfm
@@ -28,9 +28,8 @@ hist_search() {
     j=1
 
     for file do
-        [ "${PWD%%/}/$file" = "$old_pwd" ] && {
+        [ "${PWD%%/}/$file" = "$old_pwd" ] &&
             y=$j y2=$((j > bottom ? bottom : j))
-        }
 
         j=$((j + 1))
     done
@@ -61,10 +60,6 @@ list_print() {
     printf '\033[%sH' "$((y > bottom ? bottom : y))"
 }
 
-list_reset() {
-    y=1 y2=1
-}
-
 redraw() {
     list_print "$@"
     status_line "$PWD ($y/$#)"
@@ -75,20 +70,6 @@ status_line() {
         "$LINES" "$COLUMNS" "$1"
 }
 
-open_ext() {
-    # todo envar whatever
-    case $1 in
-        *.mp3|*.mp4|*.mkv|*.webm|*.flac|\
-        *.jpg|*.png|*.gif|*.jpeg|*.jpe)
-            mpv "$1"
-        ;;
-
-        *)
-            "${EDITOR:=vi}" "$1"
-        ;;
-    esac
-}
-
 print_line() {
     offset=$1
 
@@ -112,11 +93,11 @@ main() {
 
     term_resize
     term_setup
-    list_reset
+    y=1 y2=1
     redraw "$@"
 
     trap 'term_reset'  EXIT INT
-    trap 'term_resize; term_setup; list_reset; redraw "$@"' WINCH
+    trap 'term_resize; term_setup; y=1 y2=1; redraw "$@"' WINCH
 
     while key=$(dd ibs=1 count=1 2>/dev/null); do
         case $key${esc:=0} in
@@ -155,11 +136,9 @@ main() {
             l?|C2) # ARROW RIGHT
                 if cd "$cur"; then
                     set -- *
-                    list_reset
+                    y=1 y2=1
                 else
-                    term_reset
-                    open_ext "$cur"
-                    term_setup
+                    "${SHFM_OPENER:="${EDITOR:=vi}"}" "$cur"
                 fi
 
                 redraw "$@"
@@ -169,8 +148,7 @@ main() {
                 old_pwd=$PWD
                 cd .. || continue
                 set -- *
-                list_reset
-                hist=1
+                y=1 y2=1 hist=1
                 redraw "$@"
             ;;