[PATCH v3 01/11] add -i (built-in): do show an error message for incorrect inputs

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From: Johannes Schindelin <johannes.schindelin@xxxxxx>

There is a neat feature in `git add -i` where it allows users to select
items via unique prefixes.

In the built-in version of `git add -i`, we specifically sort the items
(unless they are already sorted) and then perform a binary search to
figure out whether the input constitutes a unique prefix. Unfortunately,
by mistake this code misidentifies matches even if the input string is
not actually a prefix of any item.

For example, in the initial menu, where there is a `status` and an
`update` command, the input `tadaa` was mistaken as a prefix of
`update`.

Let's fix this by looking a bit closer whether the input is actually a
prefix of the item at the found insert index.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 add-interactive.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/add-interactive.c b/add-interactive.c
index 555c4abf32..8ca503d803 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -194,7 +194,8 @@ static ssize_t find_unique(const char *string, struct prefix_item_list *list)
 	else if (index + 1 < list->sorted.nr &&
 		 starts_with(list->sorted.items[index + 1].string, string))
 		return -1;
-	else if (index < list->sorted.nr)
+	else if (index < list->sorted.nr &&
+		 starts_with(list->sorted.items[index].string, string))
 		item = list->sorted.items[index].util;
 	else
 		return -1;
-- 
gitgitgadget




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