feat(lua): vim.text.indent()

Problem:
Indenting text is a common task in plugins/scripts for
presentation/formatting, yet vim has no way of doing it (especially
"dedent", and especially non-buffer text).

Solution:
Introduce `vim.text.indent()`. It sets the *exact* indentation because
that's a more difficult (and thus more useful) task than merely
"increasing the current indent" (which is somewhat easy with a `gsub()`
one-liner).

1 files changed, 1 insertions, 3 deletions

diff --git a/test/functional/legacy/061_undo_tree_spec.lua b/test/functional/legacy/061_undo_tree_spec.lua
index 4177f908a1..8feafa2cee 100644
--- a/test/functional/legacy/061_undo_tree_spec.lua
+++ b/test/functional/legacy/061_undo_tree_spec.lua
@@ -13,9 +13,7 @@ local eval = n.eval
 local eq = t.eq
 
 local function expect_empty_buffer()
-  -- The space will be removed by t.dedent but is needed because dedent
-  -- will fail if it can not find the common indent of the given lines.
-  return expect(' ')
+  return expect('')
 end
 local function expect_line(line)
   return eq(line, eval('getline(".")'))