sjis-tools

CLI for safely editing SJIS/CP932 files — designed for AI agents.

Binary-level operations ensure encoding integrity is never broken. Every write is validated with a decode-reencode roundtrip, and automatic backups protect against corruption.

Install

npm install -g sjis-tools

Commands

sjist replace

Replace text in a SJIS/CP932 file.

sjist replace <file> <search> <replace>
sjist replace <file> --json '[{"search":"old","replace":"new"}]'

sjist create

Create a new SJIS/CP932 file.

sjist create <output-file> <content>
sjist create <output-file> --stdin

sjist delete-lines

Delete a line range from a SJIS/CP932 file.

sjist delete-lines <file> <start-line> <end-line>

sjist extract-lines

Extract a line range to a new SJIS/CP932 file.

sjist extract-lines <source> <output> <ranges>
# ranges: comma-separated, e.g. "616-1811,3147-3915"

sjist encoding-check

Validate SJIS/CP932 encoding.

sjist encoding-check <file1> [file2] ...

sjist encoding-repair

Repair encoding (convert UTF-8 to CP932).

sjist encoding-repair <file>

Safety

• Automatic backup before destructive operations (.bak files)
• CP932 roundtrip validation after every write
• Backup restoration on validation failure

License

MIT