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f2e264e43f
Arrays only existed in the svn-upstream code, used to:
- Keep a list of svn remotes.
- Convert commit msg to array of words, extract the 2nd-to-last word.
Except bash/zsh, nearly all shells failed load on syntax errors here.
Now:
- The svn remotes are a list of newline-terminated values.
- The 2nd-to-last word is extracted using standard shell substrings.
- All shells can digest the svn-upstream code.
While using shell field splitting to extract the word is simple, and
doesn't even need non-standard code, e.g. set -- $(git log -1 ...),
it would have the same issues as the old array code: it depends on IFS
which we don't control, and it's subject to glob-expansion, e.g. if
the message happens to include * or **/* (as this commit message just
did), then the array could get huge. This was not great.
Now it uses standard shell substrings, and we know the exact delimiter
to expect, because it's the match from our grep just one line earlier.
The new word extraction code also fixes svn-upstream in zsh, because
previously it used arr[len-2], but because in zsh, unlike bash, array
subscripts are 1-based, it incorrectly extracted the 3rd-to-last word.
symptom: missing upstream status in a git-svn repo: u=, u+N-M, etc.
The breakage in zsh is surprising, because it was last touched by
commit d0583da838 (prompt: fix show upstream with svn and zsh),
claiming to fix exactly that. However, it only mentions syntax fixes.
It's unclear if behavior was fixed too. But it was broken, now fixed.
Note LF=$'\n' and then using $LF instead of $'\n' few times.
A future commit will add fallback for shells without $'...', so this
would be the only line to touch instead of replacing every $'\n' .
Shells which could run the previous array code:
- bash
Shells which have arrays but were broken anyway:
- zsh: 1-based subscript
- ksh93: no "local" (the new code can't fix this part...)
- mksh, openbsd sh, pdksh: failed load on syntax error: "for ((...))".
More shells which Failed to load due to syntax error:
- dash, free/net bsd sh, busybox-ash, Schily Bourne shell, yash.
Signed-off-by: Avi Halachmi (:avih) <avihpit@yahoo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Contributed Software Although these pieces are available as part of the official git source tree, they are in somewhat different status. The intention is to keep interesting tools around git here, maybe even experimental ones, to give users an easier access to them, and to give tools wider exposure, so that they can be improved faster. I am not expecting to touch these myself that much. As far as my day-to-day operation is concerned, these subdirectories are owned by their respective primary authors. I am willing to help if users of these components and the contrib/ subtree "owners" have technical/design issues to resolve, but the initiative to fix and/or enhance things _must_ be on the side of the subtree owners. IOW, I won't be actively looking for bugs and rooms for enhancements in them as the git maintainer -- I may only do so just as one of the users when I want to scratch my own itch. If you have patches to things in contrib/ area, the patch should be first sent to the primary author, and then the primary author should ack and forward it to me (git pull request is nicer). This is the same way as how I have been treating gitk, and to a lesser degree various foreign SCM interfaces, so you know the drill. I expect things that start their life in the contrib/ area to graduate out of contrib/ once they mature, either by becoming projects on their own, or moving to the toplevel directory. On the other hand, I expect I'll be proposing removal of disused and inactive ones from time to time. If you have new things to add to this area, please first propose it on the git mailing list, and after a list discussion proves there is general interest (it does not have to be a list-wide consensus for a tool targeted to a relatively narrow audience -- for example I do not work with projects whose upstream is svn, so I have no use for git-svn myself, but it is of general interest for people who need to interoperate with SVN repositories in a way git-svn works better than git-svnimport), submit a patch to create a subdirectory of contrib/ and put your stuff there. -jc