fix: keep the line terminator of a file a save overwrites - #313
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📝 WalkthroughWalkthroughThe change adds configurable LF and CRLF output for CSV, TSV, and LTSV. Overwrite saves detect and preserve source line endings, including compressed files. It also adds dialect edge-case tests, updates dependencies, and centralizes the unknown encoding name. ChangesConfigurable line-ending output
Dialect edge-case coverage
Maintenance updates
Estimated code review effort: 3 (Moderate) | ~20 minutes Mergeability Score: 🟡 Moderate · up to In-place saves can still rewrite line endings incorrectly for multiline CSV values or larger files whose dominant terminator is outside the sampled region, causing broad formatting changes across otherwise untouched records. These bounded correctness issues should be fixed before merging. Sequence Diagram(s)sequenceDiagram
participant Caller
participant DumpDatabase
participant LineEndingDetector
participant DelimitedWriter
Caller->>DumpDatabase: configure WithLineEnding or overwrite source
DumpDatabase->>LineEndingDetector: detect source terminator when overwriting
LineEndingDetector-->>DumpDatabase: return LF or CRLF
DumpDatabase->>DelimitedWriter: write delimited records with terminator
DelimitedWriter-->>Caller: save CSV, TSV, or LTSV output
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 4
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Inline comments:
In `@dialect/value_edge_test.go`:
- Around line 264-267: Update similarToRegexp so a trailing backslash in the
pattern is escaped before appending the end anchor, producing a regex that
matches the literal backslash followed by the anchor. Update the “a trailing
escape is kept as is” expectation accordingly while preserving the other regex
conversion cases.
In `@line_ending.go`:
- Around line 82-90: The dominantLineEnding function must ignore LF and CRLF
sequences inside CSV quoted fields, including escaped quotes, and count
terminators only outside quoted fields. Make detection CSV-aware while
preserving correct handling of CRLF records containing quoted LF data and LF
records containing quoted CRLF data, and add coverage for both cases.
- Around line 74-78: Update the line-ending detection function around io.ReadAll
and dominantLineEnding to consume the complete decoded reader with bounded
memory instead of limiting detection to the first MiB. If any read error occurs,
including when partial data is returned, discard the sample and return
LineEndingLF; only call dominantLineEnding after a fully successful read.
In `@save_encoding_unit_test.go`:
- Line 39: Update the test case for Encoding(99) to use the independent literal
expected value "unknown" instead of unknownName, while leaving Encoding.String()
as the behavior under test.
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Fix all unresolved CodeRabbit comments on this PR:
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⛔ Files ignored due to path filters (1)
go.sumis excluded by!**/*.sum
📒 Files selected for processing (15)
CHANGELOG.mdREADME.mdautosave_line_ending_test.godialect/rewrite_edge_test.godialect/value_edge_test.goexample_api_test.gofilesql.gogo.modline_ending.goline_ending_test.goparser/parser_test.goparser/tsv.gosave.gosave_encoding.gosave_encoding_unit_test.go
…cape a trailing SIMILAR TO backslash
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Code Metrics Report
Details | | main (f7a0399) | #313 (897e31b) | +/- |
|---------------------|----------------|----------------|-------|
+ | Coverage | 93.0% | 93.3% | +0.3% |
| Files | 64 | 65 | +1 |
| Lines | 10535 | 10580 | +45 |
+ | Covered | 9798 | 9877 | +79 |
- | Test Execution Time | 14s | 18s | +4s |Code coverage of files in pull request scope (91.1% → 92.2%)
Reported by octocov |
1 participant
Summary
Closes #269. A save kept a source's compression and its text encoding but wrote every record with
\n, so a CRLF file saved in place came back LF throughout: a caller who edited one row got a file whose every line had changed. This adds the terminator to the things a save preserves, plus the dependency bumps Dependabot opened (#308, #309, #310, #311, #247) and another round of coverage.Changes
line_ending.gois the newLineEndingtype, its two values, and the detection an in-place save runs: the file about to be replaced is read through its codec — so a.csv.gzis read as the text inside it — and the terminator the majority of its lines use is the one written back.DumpOptions.LineEndingandWithLineEndingname the choice for a dump to a new destination, where there is no existing file to take it from (save.go);overwriteOriginalFilefills it in from the file itself, next to where it already takes the compression from the path.filesql.go), including the quoted lone empty field, andparser.WriteTSVRecordLineEndingis the same choice for a caller writing TSV records directly (parser/tsv.go). Parquet and XLSX are not line-based and are untouched.chore(deps)bumpsmoov-io/achto 1.62.1,moov-io/wireto 0.15.9,modernc.org/sqliteto 1.56.0,klauspost/compressto 1.19.2, andpierrec/lz4/v4to 4.1.28, superseding chore(deps): bump github.com/pierrec/lz4/v4 from 4.1.27 to 4.1.28 #308, chore(deps): bump github.com/klauspost/compress from 1.19.1 to 1.19.2 #309, chore(deps): bump github.com/moov-io/wire from 0.15.8 to 0.15.9 #310, chore(deps): bump github.com/moov-io/ach from 1.61.3 to 1.62.1 #311, and chore(deps): bump modernc.org/sqlite from 1.55.0 to 1.56.0 #247.dialect/value_edge_test.gocovers the value helpers behind the UDFs (the BLOB and boolean casts, the overflow checks behind theSAFE_family, the twoHEXspellings, the interval arithmetic and its month clamping), anddialect/rewrite_edge_test.gocovers the rewrite rules' "not this form" answers and the intervals they refuse. Overall coverage is 93.3%, withdialectat 91.6%.Design Decisions
The terminator is detected at save time from the file being replaced rather than recorded at load time. The information is in the file either way, and reading it where it is used keeps the loader unchanged and works the same for every entry point —
Open,Builder,LoadInto— without a per-source registry to keep in step. It costs one bounded read (1 MiB) of a file the save is about to rewrite anyway.The rule is the majority of the terminators in the sample, not the first line's. The point of the change is that rows the caller did not edit come back byte-identical: a file that is LF except for one stray CRLF stays LF, where following the first line would rewrite every other line in it. A tie, a file with no line ending, and a file that cannot be read all answer LF, which is what every save wrote before this existed — detection is an improvement on the destination's behalf and must not fail the save.
A dump to a new destination still writes
\nunless asked otherwise, so nothing that exists today changes its output.Limitations
Only
\nand\r\nare offered. A lone\ris not a terminator any of the readers here accept, so writing one would produce a file this package could not read back.Summary by CodeRabbit
New Features
Documentation
Tests