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✨ Add PlatformFile.walk() and sizeRecursively() - #684
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly identifies both primary API additions, PlatformFile.walk()andsizeRecursively(). It is concise and directly related to the main changes. The emoji is minor noise but does not ma…Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Full details: Title check
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The title clearly identifies both primary API additions,
PlatformFile.walk()andsizeRecursively(). It is concise and directly related to the main changes. The emoji is minor noise but does not make the title unclear.
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Review comments at
@filekit-core/src/commonMain/kotlin/io/github/vinceglb/filekit/PlatformFile.kt:
- Line 165: Update the receiver handling in walk() and sizeRecursively() to
check isSymbolicLink() before checking file type or traversing descendants. Make
walk() yield a symbolic-link receiver without descending, and make
sizeRecursively() return 0 for a symbolic-link receiver.
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📒 Files selected for processing: 13
docs/core/platform-file.mdxfilekit-core/src/androidHostTest/kotlin/io/github/vinceglb/filekit/PlatformFileAndroidTest.ktfilekit-core/src/androidMain/kotlin/io/github/vinceglb/filekit/PlatformFile.android.ktfilekit-core/src/appleMain/kotlin/io/github/vinceglb/filekit/PlatformFile.apple.ktfilekit-core/src/commonMain/kotlin/io/github/vinceglb/filekit/PlatformFile.ktfilekit-core/src/jvmMain/kotlin/io/github/vinceglb/filekit/PlatformFile.jvm.ktfilekit-core/src/jvmTest/kotlin/io/github/vinceglb/filekit/PlatformFileJvmTest.ktfilekit-core/src/linuxMain/kotlin/io/github/vinceglb/filekit/PlatformFile.linux.ktfilekit-core/src/mingwX64Main/kotlin/io/github/vinceglb/filekit/PlatformFile.mingw.ktfilekit-core/src/nonWebMain/kotlin/io/github/vinceglb/filekit/PlatformFile.nonWeb.ktfilekit-core/src/nonWebTest/kotlin/io/github/vinceglb/filekit/PlatformFileTraversalTest.ktfilekit-core/src/webMain/kotlin/io/github/vinceglb/filekit/PlatformFile.web.ktfilekit-core/src/webTest/kotlin/io/github/vinceglb/filekit/PlatformFileWebTest.kt
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Inline comments:
Review comments at @docs/core/platform-file.mdx:
- Line 210: Qualify the `sizeRecursively()` dispatcher guidance in the `walk()`
documentation to apply only to non-web platforms. Make clear that web
implementations call `computeSizeRecursively()` directly and do not switch to
`Dispatchers.IO`.
- Line 208: Update the symbolic-link documentation near walk() and
sizeRecursively() to state that on Windows, OneDrive Files On-Demand folders are
treated as links: walk() yields the folders without traversing their contents,
and sizeRecursively() excludes their contents. Clarify that the earlier “every
file” and “total size” statements do not apply to those folders.
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docs/core/platform-file.mdxfilekit-core/src/commonMain/kotlin/io/github/vinceglb/filekit/PlatformFile.ktfilekit-core/src/jvmTest/kotlin/io/github/vinceglb/filekit/PlatformFileJvmTest.ktfilekit-core/src/nonWebTest/kotlin/io/github/vinceglb/filekit/PlatformFileTraversalTest.kt
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walk() lazily yields a directory tree depth-first, without the starting directory, and never follows symbolic links. sizeRecursively() sums the regular files in the tree on Dispatchers.IO and counts unknown sizes as 0. Link detection moves out of deleteIfSymbolicLink() into an internal isSymbolicLink() so traversal reuses it. Delete behavior is unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Hi @N7ghtm4r3, sorry, you should have heard this from me before you saw this PR merged. I've replied in detail on #673. Short answer: the core API matched #666, but the PR went well beyond it, so I wrote a smaller version myself. Thanks again for the idea! |
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Hi @vinceglb! Thank you for the reply and implementation! |
Implements the API agreed in discussion #666:
walk()is lazy and depth-first. It doesn't yield the starting directory. On a regular file or a symbolic link it yields just that entry, as stdlibPath.walk()does.maxDepthmust be positive, matchingFileTreeWalk.maxDepth(). Errors throw, likelist().delete(recursively = true)and stdlibPath.walk()). They count as 0 insizeRecursively(), so a link to a file outside the tree isn't counted.sizeRecursively()runs onDispatchers.IO(not on web) and counts unknown sizes as 0. On Apple it holds security-scoped access on the root once for the whole computation.size()is unchanged.commonMain. Link detection is split out of eachdeleteIfSymbolicLink()into aninternal expect fun PlatformFile.isSymbolicLink()(web returnsfalse).delete()behavior is unchanged.isDirectory(), so a link's target is never read, not even its metadata. On Android SAF the link check is a constantfalse, so it adds no provider query.docs/core/platform-file.mdx.Platforms: all. Android
content://trees, Apple, JVM, Linux and mingw, plus web directories picked with the directory picker. OPFS directories throw, aslist()already does for them.Windows: OneDrive "Files On-Demand" folders
Existing link detection (JVM and mingw) treats every
FILE_ATTRIBUTE_REPARSE_POINTentry as a link. OneDrive Files On-Demand folders are reparse points (cloud tagsIO_REPARSE_TAG_CLOUD_*). Windows exposes that attribute to most processes by default (PHCM_EXPOSE_PLACEHOLDERS; see RtlSetProcessPlaceholderCompatibilityMode). Go hit the same bug in golang/go#22579.As a result,
walk()yields such a folder without descending into it, andsizeRecursively()counts it as 0.delete(recursively = true)already has the same blind spot: it callsRemoveDirectoryWon the folder rather than emptying it first.Not fixed here (follow-up): the fix is to read the reparse tag (
FindFirstFileW→dwReserved0) and treat only name-surrogate tags (IsReparseTagNameSurrogate: symlinks and junctions) as links. That changesdelete()on Windows, since cloud folders would then be recursed into. I can't verify it without a OneDrive machine, so it should be its own PR.Validation
Run locally, sequentially, with
--max-workers=1::filekit-core:jvmTest:PlatformFileTraversalTest,PlatformFileJvmTest(including the link-cycle regression),PlatformFileDeletionTest,PlatformFileNonWebTest:filekit-core:testAndroidHostTest:PlatformFileTraversalTest,PlatformFileAndroidTest(SAF walk; unknown size counts as 0),PlatformFileDeletionTest:filekit-core:macosArm64Test:PlatformFileTraversalTest,PlatformFileDeletionTest:filekit-core:wasmJsBrowserTest:PlatformFileWebTest:filekit-core:compileKotlinLinuxX64,:filekit-core:compileKotlinMingwX64Left to CI: the full multiplatform test matrix, including Windows, Linux, iOS and JS.
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