ignore moves over folds (#5)

plugin/beacon.vim

@@ -135,13 +135,32 @@ let s:prev_cursor = 0
 " highlight position if cursor moved significally
 function! s:Cursor_moved()
     let l:cur = line(".")
-    let l:diff = l:cur - s:prev_cursor
+    let l:diff = abs(l:cur - s:prev_cursor)
 
-    if l:diff > g:beacon_minimal_jump || l:diff < g:beacon_minimal_jump * -1
-        call s:Highlight_position(v:false)
+    if l:diff > g:beacon_minimal_jump
+        let l:prev_fold = foldclosed(s:prev_cursor) 
+        let l:prev_fold_end = foldclosedend(s:prev_cursor) 
+        let l:cur_fold = foldclosed(l:cur) 
+        let l:cur_fold_end = foldclosedend(l:cur) 
+
+        " if we move over fold, substract fold lines from diff
+        if l:prev_fold > -1 && l:prev_fold_end > -1
+            let l:diff -= l:prev_fold_end - l:prev_fold
+        endif
+
+        " if we move over fold, substract fold lines from diff
+        if l:cur_fold > -1 && l:cur_fold_end > -1
+            let l:diff -= l:cur_fold_end - l:cur_fold
+        endif
+
+        " check diff again before highlight
+        if l:diff > g:beacon_minimal_jump
+            call s:Highlight_position(v:false)
+        endif
     endif
 
     let s:prev_cursor = l:cur
+
 endfunction
 
 function! s:Beacon_toggle() abort