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The Git project is not exactly the easiest project to get started in: it's written in C and POSIX shell, with bits of Perl, Rust and other languages sprinkled into it. On top of that, the project has grown somewhat organically over time, making the codebase hard to navigate. These are problems that we're aware of, and there have been and still are efforts to clean up some of the technical debt that is natural to exist an a project that is more than 20 years old. Furthermore, we provide resources to newcomers that help them out like our coding guidelines, code of conduct or "MyFirstContribution.adoc". But there is a rather practical problem: finding your way around in our project's tree is not easy. Doing a directory listing in the top-level directory will present you with more than 550 files, which makes it extremely hard for a newcomer to figure out what files they are even supposed to look at. This makes the onboarding experience somewhat harder than it really needs to be. This isn't only a problem for newcomers though, as I myself struggle to find the files I am looking for because of the sheer number of files. Besides the problem of discoverability it also creates a problem of structure. It is not obvious at all which files are part of "libgit.a" and which files are only linked into our final executables. So while we have this split in our build systems, that split is not evident at all in our tree. Introduce a new "lib/" directory and move all of our sources for "libgit.a" into it to fix these issues. It makes the split we have evident and reduces the number of files in our top-level tree from 550 files to ~80 files. This is still a lot of files, but it's significantly easier to navigate already. Furthermore, we can further iterate after this step and think about introducing a better structure for remaining files, as well. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
#ifndef ITERATOR_H
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#define ITERATOR_H
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/*
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* Generic constants related to iterators.
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*/
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/*
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* The attempt to advance the iterator was successful; the iterator
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* reflects the new current entry.
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*/
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#define ITER_OK 0
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/*
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* The iterator is exhausted.
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*/
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#define ITER_DONE -1
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/*
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* The iterator experienced an error. The iteration has been aborted
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* and the iterator has been freed.
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*/
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#define ITER_ERROR -2
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/*
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* Return values for selector functions for merge iterators. The
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* numerical values of these constants are important and must be
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* compatible with ITER_DONE and ITER_ERROR.
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*/
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enum iterator_selection {
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/* End the iteration without an error: */
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ITER_SELECT_DONE = ITER_DONE,
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/* Report an error and abort the iteration: */
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ITER_SELECT_ERROR = ITER_ERROR,
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/*
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* The next group of constants are masks that are useful
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* mainly internally.
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*/
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/* The LSB selects whether iter0/iter1 is the "current" iterator: */
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ITER_CURRENT_SELECTION_MASK = 0x01,
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/* iter0 is the "current" iterator this round: */
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ITER_CURRENT_SELECTION_0 = 0x00,
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/* iter1 is the "current" iterator this round: */
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ITER_CURRENT_SELECTION_1 = 0x01,
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/* Yield the value from the current iterator? */
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ITER_YIELD_CURRENT = 0x02,
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/* Discard the value from the secondary iterator? */
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ITER_SKIP_SECONDARY = 0x04,
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/*
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* The constants that a selector function should usually
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* return.
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*/
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/* Yield the value from iter0: */
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ITER_SELECT_0 = ITER_CURRENT_SELECTION_0 | ITER_YIELD_CURRENT,
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/* Yield the value from iter0 and discard the one from iter1: */
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ITER_SELECT_0_SKIP_1 = ITER_SELECT_0 | ITER_SKIP_SECONDARY,
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/* Discard the value from iter0 without yielding anything this round: */
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ITER_SKIP_0 = ITER_CURRENT_SELECTION_1 | ITER_SKIP_SECONDARY,
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/* Yield the value from iter1: */
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ITER_SELECT_1 = ITER_CURRENT_SELECTION_1 | ITER_YIELD_CURRENT,
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/* Yield the value from iter1 and discard the one from iter0: */
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ITER_SELECT_1_SKIP_0 = ITER_SELECT_1 | ITER_SKIP_SECONDARY,
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/* Discard the value from iter1 without yielding anything this round: */
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ITER_SKIP_1 = ITER_CURRENT_SELECTION_0 | ITER_SKIP_SECONDARY
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};
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#endif /* ITERATOR_H */
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