From 0d654e3d9d97f346cfe09fa0f7b3a69fe1c14d48 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Thu, 30 Aug 2018 11:14:22 +1200
Subject: First version

---
 autoload/squeeze_repeat_blanks.vim | 44 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 autoload/squeeze_repeat_blanks.vim

(limited to 'autoload')

diff --git a/autoload/squeeze_repeat_blanks.vim b/autoload/squeeze_repeat_blanks.vim
new file mode 100644
index 0000000..5221093
--- /dev/null
+++ b/autoload/squeeze_repeat_blanks.vim
@@ -0,0 +1,44 @@
+" Reduce all groups of blank lines within range to the last line in that
+" group, deleting the others.
+function! squeeze_repeat_blanks#Squeeze(start, end) abort
+
+  " List of line numbers to delete
+  let l:deletions = []
+
+  " Flag for whether we've encountered a blank line group
+  let l:group = 0
+
+  " Pattern for what constitutes a 'blank'; configurable per-buffer
+  let l:pattern = get(b:, 'squeeze_repeat_blanks_blank')
+        \ ? b:squeeze_repeat_blanks_blank
+        \ : '^$'
+
+  " Iterate through the lines, collecting numbers to delete
+  for l:num in range(a:start, a:end)
+
+    " End a blank group if the current line doesn't match the pattern
+    if getline(l:num) !~# l:pattern
+      let l:group = 0
+
+    " If we've found a repeated blank line, flag the one before it for
+    " deletion; this way we end up with the last line of the group
+    elseif l:group
+      let l:deletions += [l:num - 1]
+
+    " If this is the first blank line, start a group
+    else
+      let l:group = 1
+    endif
+
+  endfor
+
+  " Delete each flagged line, in reverse order so that renumbering doesn't
+  " bite us
+  for l:num in reverse(l:deletions)
+    silent execute l:num . 'delete'
+  endfor
+
+  " Report how many lines were deleted
+  echomsg len(l:deletions) . ' deleted'
+
+endfunction
-- 
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