feat: add transparent gzip decompression support#198
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feat: add transparent gzip decompression support#198
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Allow opening gzip-compressed CSV/TSV files (e.g. data.csv.gz) directly without manual decompression. Gzip files are detected by .gz extension and decompressed into the existing temp file path, so downstream code is unaffected. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
csvlens data.csv.gzjust works.gzextension and decompresses into the existing temp file, so no changes needed to CSV parsing, delimiter sniffing, or the app layerflate2dependency for gzip decodingChanges
Cargo.toml: addflate2 = "1"src/io.rs:is_gzip()helper + gzip branch inSeekableFile::new()usingGzDecodertests/data/small.csv.gz: test fixturesrc/io.rstests:test_is_gzip()andtest_gzip_file()Test plan
cargo buildsucceedscargo test— all 108 tests pass (including 2 new ones)csvlens tests/data/small.csv.gzdisplays the CSVzcat tests/data/small.csv.gz | csvlensstill works (existing stdin path)🤖 Generated with Claude Code