NSV, CLI tool

Command-line tool for the NSV (Newline-Separated Values) format.

Installation

To install (or update) from crates.io, run

cargo install nsv-cli

Usage

nsv help     # proper summary
nsv version  # this tool + underlying parser's versions

Sanitize

Clean up files corrupted by Microsoft's software.

# From file
nsv sanitize dirty.nsv > clean.nsv

# From stdin
cat dirty.nsv | nsv sanitize > clean.nsv

The sanitize command:

• Strips UTF-8 BOM
• Normalizes CRLF to LF
• Errors on bare CR or mixed line endings
• NSV-agnostic, can be used on any text file

Validate

Check encoding and structural correctness.

nsv validate data.nsv
nsv validate --table data.nsv

The validate command:

• Checks for rejected strings: dangling backslashes, unknown escape sequences, missing termination
• Reports byte offsets and UTF-8-aware character columns for each issue (rely on byte offsets if you're not using UTF-8)
• with --table, checks that all rows have equal length
• Exits with 0 on success, 1 on warnings or errors

Transpose

Transpose a table.
Both t and transpose are valid, prefer the latter for long-living scripts.

nsv t table.nsv
cat table.nsv | nsv t

The transpose command:

• Requires table input (all rows must have equal arity), errors on ragged data
• Allocates full input in memory (once, but still)

Stats

Structural overview of an NSV file.

$ nsv stats data.nsv
rows: 3
cells: 12
min_arity: 4
max_arity: 4
is_table: true
max_cell_bytes: 1