change typo_iter to not find typos in correct spelled words

When naivingly searching for the typo in our text we might find it
before its actual appearense in a correct word containing the typo
(e.g. "broken ok" would find the typo "ok" in the middle of the word "broken").

To prevent this we now only find a typo if its enclosed in non-letter
characters, this prevents typos from being found in regular words.
Typos starting with '"' for example are still found correctly.

1 files changed, 7 insertions, 2 deletions

diff --git a/spellcheck.lua b/spellcheck.lua
index 59c5630..fe7d8a3 100644
--- a/spellcheck.lua
+++ b/spellcheck.lua
@@ -86,9 +86,14 @@ local function typo_iter(text, typos, ignored)
 		until(not typo or not ignored[typo])
 
 		if typo then
-			local start, finish = text:find(typo, index, true)
+			-- to prevent typos from being found in correct words before them
+			-- ("stuff stuf", "broken ok", ...)
+			-- we match typos only when they are enclosed in non-letter characters.
+			local start, finish = text:find("[%A]" .. typo .. "[%A]", index)
 			index = finish
-			return typo, start, finish
+
+			-- ignore the first and last non letter character
+			return typo, start + 1, finish - 1
 		end
 	end
 end