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Reduce cost of deletion in levenstein distance (4 -> 3)

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Before this patch, a character deletion has the same cost as 2 swaps, or
4 additions, so Git prefers suggesting a completely scrambled command
name to removing a character. For example, "git tags" suggests "stage",
but not "tag".

By setting the deletion cost to 3, we keep it higher than swaps or
additions, but prefer 1 deletion to 2 swaps. "git tags" now suggests
"tag" in addition to staged.

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matthieu Moy 2012-05-27 18:02:58 +02:00 committed by Junio C Hamano
parent befc5ed379
commit c41494f8c8
1 changed files with 1 additions and 1 deletions
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2
help.c
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@ -317,7 +317,7 @@ const char *help_unknown_cmd(const char *cmd)
}
main_cmds.names[i]->len =
levenshtein(cmd, candidate, 0, 2, 1, 4) + 1;
levenshtein(cmd, candidate, 0, 2, 1, 3) + 1;
}
qsort(main_cmds.names, main_cmds.cnt,