BurntSushi/xsv

Select columns based on regex

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#155 创建于 2018年10月28日

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 (4 评论) (0 反应) (0 负责人)Rust (9,730 star) (315 fork)batch import
enhancementhelp wanted

描述

I have a pretty unwieldy CSV file with a ton of columns (~300000) all with quite long column names. I'd really like to be able to select the columns using a regex rather than having to attempt to figure out a set of ranges from the header. Is this a feature you think would fit in xsv?

I'm not sure exactly what the input would look like; perhaps an additional flag to indicate that the selection(s) are regexes?

Thanks so much for all your work, by the way! :smiley:

Edit: forgot to say, I'd be happy to have a go at implementing this!

贡献者指南

技术栈
rust
领域
clitooling
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
basic Rust knowledgefamiliarity with regexunderstanding of xsv's codebase
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
50
研究方向
Investigate the xsv codebase to understand how column selection currently works (likely via index or name). Look at the CLI argument parsing in src/main.rs and the select command implementation. Explore the regex crate for Rust. The issue suggests an additional flag like regex to indicate regex patterns. Consider the performance implications of regex matching across 300,000 columns. Review any existing comments in the issue for further requirements or constraints.
Select columns based on regex · BurntSushi/xsv#155 | Good First Issue