feat: add --columns flag to list CSV input column names#113
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Adds --columns mode that reads only the CSV header row from stdin, prints each column name on its own line to stdout, and exits 0. - With -v/--verbose, shows inferred type per column (name INTEGER) using the first 100 data rows for inference - Mutually exclusive with a query argument (exits 1 with error) - Respects --delimiter and --tsv flags - 5 integration tests added (basic, verbose, delimiter, tsv, error) - Documented in --help, README.md Flags table, and docs/sql-pipe.1.scd Closes #85
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- Replace 'catch break' with proper CSV error reporting in runColumns verbose path; malformed data rows now exit 2 with row number instead of silently inferring all types as TEXT - Document dual --verbose behavior in printUsage: row count in query mode, inferred types in --columns mode - Add integration tests 38-41: malformed CSV in verbose mode (exit 2), header-only input (all TEXT), empty stdin (exit 2), -v alias
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Summary
--columnsmode: reads only the CSV header row, prints each column name on its own line, exits 0-v/--verbose, also shows the inferred type per column (e.g.id INTEGER,amount REAL)--delimiterand--tsvflagsChanges
src/main.zig: newColumnsArgsstruct,.columnsvariant inArgsResult,--columnsparsing inparseArgs,runColumns()function, updatedprintUsage()build.zig: 5 new integration tests (basic output, verbose types, delimiter, tsv, error case)README.md: new--columnsrow in the Flags tabledocs/sql-pipe.1.scd: new--columnsOPTIONS entry; updated SYNOPSIS with second invocation formAcceptance Criteria
--columnsreads only the CSV header row, prints each column name on its own line to stdout, and exits 0--columns --verbose:id INTEGER,amount REAL,region TEXT--columnsis mutually exclusive with a query argument (prints usage error if both provided)--delimiterand--tsvflags--help, README.md Flags table, anddocs/sql-pipe.1.scdCloses #85