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When a branch or tag name is completed with zsh in a large git repo, the completion is slow if the given prefix doesn't match a file or directory in the current working directory. Testing with linux.git, which contains release tags like v3.9 and a directory virt/: git log v<tab> takes about 0.5 seconds, while git log v3<tab> takes about 25 seconds. (Timed using zsh 4.3.17, on a fairly slow cpu. zsh from git appears to be quite a bit faster, but the difference between completing v and v3 is still large.) The difference between the two is that v<tab> passes the result of v* to git ls-files while v3<tab> determines that v3* matches no files, and passes an empty prefix to git ls-files. So git ls-files lists all files in the repo and passes that on to _multi_parts. Making git do the expansion of the * after the prefix lets git ls-files v3* return an empty list, making _multi_parts job easier. This does not affect the behavior of git log <tab>, but improves the performance of partial tag and branch tab-completion in the common case where file names and tag/branch names don't overlap. |
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