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|
;;; nix-util.el --- Utilities for dealing with Nix code. -*- lexical-binding: t; -*-
;;
;; Copyright (C) 2019 Google Inc.
;;
;; Author: Vincent Ambo <tazjin@google.com>
;; Version: 1.0
;; Package-Requires: (json map)
;;
;;; Commentary:
;;
;; This package adds some functionality that I find useful when
;; working in Nix buffers.
(require 'json)
(require 'map)
(defun nix/prefetch-github (owner repo) ; TODO(tazjin): support different branches
"Fetch the master branch of a GitHub repository and insert the
call to `fetchFromGitHub' at point."
(interactive "sOwner: \nsRepository: ")
(let* (;; Keep these vars around for output insertion
(point (point))
(buffer (current-buffer))
(name (concat "github-fetcher/" owner "/" repo))
(outbuf (format "*%s*" name))
(errbuf (get-buffer-create "*github-fetcher/errors*"))
(cleanup (lambda ()
(kill-buffer outbuf)
(kill-buffer errbuf)
(with-current-buffer buffer
(read-only-mode -1))))
(prefetch-handler
(lambda (_process event)
(unwind-protect
(pcase event
("finished\n"
(let* ((json-string (with-current-buffer outbuf
(buffer-string)))
(result (json-parse-string json-string)))
(with-current-buffer buffer
(goto-char point)
(map-let (("rev" rev) ("sha256" sha256)) result
(read-only-mode -1)
(insert (format "fetchFromGitHub {
owner = \"%s\";
repo = \"%s\";
rev = \"%s\";
sha256 = \"%s\";
};" owner repo rev sha256))
(indent-region point (point))))))
(_ (with-current-buffer errbuf
(error "Failed to prefetch %s/%s: %s"
owner repo (buffer-string)))))
(funcall cleanup)))))
;; Fetching happens asynchronously, but we'd like to make sure the
;; point stays in place while that happens.
(read-only-mode)
(make-process :name name
:buffer outbuf
:command `("nix-prefetch-github" ,owner ,repo)
:stderr errbuf
:sentinel prefetch-handler)))
(provide 'nix-util)
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