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Handle edge case in common prefix calculation

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This commit is contained in:
Andy Stewart
2019-09-24 18:33:12 +01:00
parent ccd4972d23
commit 3405ad72b6
2 changed files with 6 additions and 0 deletions
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3
autoload/gitgutter/diff_highlight.vim
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@@ -162,6 +162,9 @@ endif
"
function! s:common_prefix(a, b)
let len = min([len(a:a), len(a:b)])
if len == 0
return -1
endif
for i in range(len)
if a:a[i:i] != a:b[i:i]
return i - 1

3
test/test_gitgutter.vim
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@@ -916,6 +916,9 @@ endfunction
function Test_common_prefix()
" zero length
call assert_equal(-1, gitgutter#diff_highlight#common_prefix('', 'foo'))
call assert_equal(-1, gitgutter#diff_highlight#common_prefix('foo', ''))
" nothing in common
call assert_equal(-1, gitgutter#diff_highlight#common_prefix('-abcde', '+pqrst'))
call assert_equal(-1, gitgutter#diff_highlight#common_prefix('abcde', 'pqrst'))