hebcal を Homebrew, apt, Nix でインストール

プロジェクトリンク

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コマンドとエイリアス

• hebcal

プロジェクトの歴史

The README credits Danny Sadinoff as the original author, with portions by Michael J. Radwin and later contributions for JavaScript, Daf Yomi, Molad, and sunrise/sunset features. It describes Hebcal as a flexible program for printing Jewish calendar events for a given secular or Hebrew year, month, day, or ISO date.

The README records that version 3 rewrote much of the program using the Emacs 19 calendar routines by Edward M. Reingold and Nachum Dershowitz, tying the Unix CLI to a wider lineage of calendrical computation rather than a single-purpose holiday table. GitHub repository metadata records the public hosted project from July 2013.

採用の歴史

Hebcal occupies the classic Unix utility niche: a domain-specific calendar program that can print plain text, tab-delimited output, localized event names, and date ranges for shell scripts or human reading. The input package facts record packaging in Homebrew, Debian, Ubuntu, and Nix, suggesting sustained use by command-line users who want Jewish calendar data outside a web app.

使われ方

The CLI accepts a year, month/day/year, Hebrew month/year, or ISO date and can selectively enable or suppress Hebrew dates, holidays, sedrot, Omer counts, modern Israeli holidays, candle-lighting, Havdalah, zmanim, and daily learning schedules. Its environment support includes `HEBCAL_CITY` for default candle-lighting geography and `HEBCAL_OPTS` for repeated command options.

パッケージ好きにとっての重要性

For package nerds, Hebcal is a good example of a small culturally specific Unix tool that remains valuable because it is composable. It turns calendrical rules, local sunset calculations, transliteration choices, and recurring study cycles into predictable command output that can be piped, scripted, cron-run, or wrapped by other calendar systems.

タイムライン

• Version 3 era: The README says much of Hebcal was rewritten using Emacs 19 calendar routines by Reingold and Dershowitz.
• 2013: GitHub repository metadata records the hosted Hebcal source repository.
• Package-manager era: The input package facts record Hebcal in Homebrew, Debian, Ubuntu, and Nix packaging.

Related projects

• The README explicitly points to `calendar(1)`, Emacs calendar, hcal, hdate, omer, remind, and rise as related command-line or calendar tools. Algorithmically it is related to the calendrical work of Edward M. Reingold and Nachum Dershowitz.

ソース

• https://github.com/hebcal/hebcal
• https://hebcal.github.io/
• https://raw.githubusercontent.com/hebcal/hebcal/main/README.md