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Swaps rows and columns of NSV table data. Requires uniform row arity — exits with an error on ragged input. Works at the byte level (decode_bytes → transpose → encode_bytes). https://claude.ai/code/session_01QPwRx4hq2FgScPdegPr7ap
Read → decode → move cells into transposed structure → encode. No intermediate copies. No silent BOM/CRLF fixup — pipe through nsv sanitize if needed. https://claude.ai/code/session_01QPwRx4hq2FgScPdegPr7ap
Write each transposed row directly by iterating columns, avoiding allocation of the entire transposed structure. https://claude.ai/code/session_01QPwRx4hq2FgScPdegPr7ap
Transpose is structure-only: it rearranges cells without modifying content. Work directly with escaped line slices instead of decoding then re-escaping each cell. https://claude.ai/code/session_01QPwRx4hq2FgScPdegPr7ap
Replace verbose unwrap_or_else(panic!) with ?, returning io::Result. Caller handles BrokenPipe silently. https://claude.ai/code/session_01QPwRx4hq2FgScPdegPr7ap
Match the pattern used by sanitize: return Result<(), String> and let main handle printing and exit code. https://claude.ai/code/session_01QPwRx4hq2FgScPdegPr7ap
Drop redundant description, show involution as a pipeline. https://claude.ai/code/session_01QPwRx4hq2FgScPdegPr7ap
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Summary
This PR adds a new
transposecommand that swaps rows and columns in NSV (Newline Separated Values) data. The implementation includes comprehensive test coverage.Key Changes
transposecommand: Added to the CLI with support for file input or stdintests/test_transpose.shwith 11 test cases covering:Implementation Details
https://claude.ai/code/session_01QPwRx4hq2FgScPdegPr7ap