this post was submitted on 13 Feb 2025
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Nushell

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What is Nushell?

Nushell is a powerful shell and scripting language with strong typing, querying, and piping functionalities.

From the official documentation; Introduction:

The goal of this project is to take the Unix philosophy of shells, where pipes connect simple commands together, and bring it to the modern style of development. Thus, rather than being either a shell, or a programming language, Nushell connects both by bringing a rich programming language and a full-featured shell together into one package.

Nu takes cues from a lot of familiar territory: traditional shells like bash, object based shells like PowerShell, gradually typed languages like TypeScript, functional programming, systems programming, and more. But rather than trying to be a jack of all trades, Nu focuses its energy on doing a few things well:

Examples

Shell Examples…

0x[7F000001] | chunks 1 | each { into int } | str join "."
# => 127.0.0.1
ls | where size > 1kb
# => ╭───┬───────────────────┬──────┬─────────┬────────────╮
# => │ # │       name        │ type │  size   │  modified  │
# => ├───┼───────────────────┼──────┼─────────┼────────────┤
# => │ 0 │ Gemfile           │ file │ 1.1 KiB │ 3 days ago │
# => │ 1 │ Gemfile.lock      │ file │ 6.9 KiB │ 3 days ago │
# => │ 2 │ LICENSE           │ file │ 1.1 KiB │ 3 days ago │
# => │ 3 │ SUMMARY.md        │ file │ 3.7 KiB │ 3 days ago │
# => ╰───┴───────────────────┴──────┴─────────┴────────────╯
help commands | where name == each | first | get params.name
# => ╭───┬──────────────────╮
# => │ 0 │ closure          │
# => │ 1 │ --help(-h)       │
# => │ 2 │ --keep-empty(-k) │
# => ╰───┴──────────────────╯
http get https://programming.dev/api/v3/site | get all_languages | length
# => 184

http get https://programming.dev/api/v3/site | get taglines.content
# => ╭───┬────────────────────────────────────╮
# => │ 0 │ Broken communities have been fixed │
# => ╰───┴────────────────────────────────────╯

Web-Links

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My website is implemented through Hugo, with content sources in Markdown. Metadata is added through a so-called "front matter" header within Markdown files. I noticed date metadata (front matter) was missing on content pages and consequently had 2001 on RSS feeds.

I used Nushell to en-mass add page dates after-the-fact, with date values determined through Git.

# Determine pages with missing date front matter (may be missing pages that have `date = ` as content)
glob **/*.md | where {|x| $x | open | not ($in | str contains 'date = ') } | save missing.json

# Determine content creation dates through Git add authoring date
open missing.json | wrap path | upsert date {|x| git log '--follow' '--diff-filter=A' '--format=%ad' '--date=iso' '--' $x.path | into datetime } | save dates.json

# Prepend date TOML front matter to closing fence
open dates.json | each {|x| $x.path | open --raw | str replace "\r\n+++\r\n" $"\r\ndate = \"($x.date | format date '%Y-%m-%d %H:%M:%S')\"\r\n+++\r\n" | collect | save -f $x.path }

Example [inline] result/fixup:

date = "2022-08-07 18:31:18"
+++

Some work details and manual cleanup (e.g. pages with resource front matter where the date declaration must be placed before them) omitted.

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