49053cb1b4
Before this commit, there were three issues with the makePath implementation: 1. The component iteration did not 'collapse' consecutive path separators; instead, it would treat `a/b//c` as `a/b//c`, `a/b/`, `a/b`, and `a`. 2. Trailing path separators led to redundant `makeDir` calls, e.g. with the path `a/b/` (if `a` doesn't exist), it would try to create `a/b/`, then try `a/b`, then try `a`, then try `a/b`, and finally try `a/b/` again. 3. The iteration did not treat the root of a path specially, so on Windows it could attempt to make a directory with a path like `X:` for something like `X:\a\b\c` if the `X:\` drive doesn't exist. This didn't lead to any problems that I could find, but there's no reason to try to make a drive letter as a directory (or any other root path). This commit fixes all three issues by introducing a ComponentIterator that is root-aware and handles both sequential path separators and trailing path separators and uses it in `Dir.makePath`. This reduces the number of `makeDir` calls for paths where (1) the root of the path doesn't exist, (2) there are consecutive path separators, or (3) there are trailing path separators As an example, here are the makeDir calls that would have been made before this commit when calling `makePath` for a relative path like `a/b//c//` (where the full path needs to be created): a/b//c// a/b//c/ a/b//c a/b/ a/b a a/b a/b/ a/b//c a/b//c/ a/b//c// And after this commit: a/b//c a/b a a/b a/b//c
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
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