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105 lines
3.5 KiB
105 lines
3.5 KiB
;;; nix-instantiate.el -- run nix commands in Emacs -*- lexical-binding: t -*-
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;; Author: Matthew Bauer <mjbauer95@gmail.com>
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;; Homepage: https://github.com/NixOS/nix-mode
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;; Keywords: nix
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;; Version: 1.4.0
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;; This file is NOT part of GNU Emacs.
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;;; Commentary:
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;;; Code:
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(require 'nix)
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(require 'json)
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(defun nix-instantiate--parsed (drv)
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"Get the parsed version of the .drv file.
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DRV file to load from."
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(let ((stdout (generate-new-buffer "nix show-derivation"))
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result)
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(call-process nix-executable nil (list stdout nil) nil
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"show-derivation" drv)
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(setq result
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(cdar (with-current-buffer stdout
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(when (eq (buffer-size) 0)
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(error "Nix’s show-derivation %s failed to produce any output"
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drv))
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(goto-char (point-min))
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(json-read))))
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(kill-buffer stdout)
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result))
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(defun nix-instantiate (nix-file &optional attribute parse)
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"Run nix-instantiate on a Nix expression.
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NIX-FILE the file to instantiate.
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ATTRIBUTE an attribute of the Nix file to use.
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PARSE whether to parse nix-instantiate output."
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(interactive (list (read-file-name "Nix file: ") nil t))
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(let ((stdout (generate-new-buffer "nix-instantiate"))
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result)
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(if attribute
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(call-process nix-instantiate-executable nil (list stdout nil) nil
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nix-file "-A" attribute)
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(call-process nix-instantiate-executable nil (list stdout nil) nil
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nix-file))
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(with-current-buffer stdout
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(when (eq (buffer-size) 0)
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(error
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"Error: nix-instantiate %s failed to produce any output"
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nix-file))
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(setq result (substring (buffer-string) 0 (- (buffer-size) 1)))
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(when parse
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(setq result (nix-instantiate--parsed result))))
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(kill-buffer stdout)
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result))
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(defvar nix-instantiate--running-processes nil)
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(defun nix-instantiate--sentinel (prop err proc event)
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"Make a nix-instantiate process.
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PROP the prop name of nix-instantiate--running-processes.
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ERR the error buffer.
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PROC the process that has been run.
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EVENT the event that was fired."
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(when (string= event "finished\n")
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(with-current-buffer (process-buffer proc)
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(unless (eq (buffer-size) 0)
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(let ((drv (nix-instantiate--parsed
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(substring (buffer-string) 0 (- (buffer-size) 1)))))
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(dolist
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(callback (lax-plist-get nix-instantiate--running-processes prop))
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(funcall callback drv)))))
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(setq nix-instantiate--running-processes
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(lax-plist-put nix-instantiate--running-processes prop nil)))
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(unless (process-live-p proc)
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(kill-buffer (process-buffer proc))
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(kill-buffer err)))
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(defun nix-instantiate-async (callback nix-file &optional attribute)
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"Run nix-instantiate on a Nix expression, asynchronously.
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CALLBACK the function to call when instantiate completes.
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NIX-FILE the file to instantiate
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ATTRIBUTE an attribute of the Nix file to use."
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(setq nix-file (expand-file-name nix-file))
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(let* ((prop (if attribute
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(expand-file-name attribute nix-file) nix-file))
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(data (lax-plist-get nix-instantiate--running-processes prop))
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(stdout (generate-new-buffer "nix-instantiate"))
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(stderr (generate-new-buffer "nix-instantiate error")))
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(setq nix-instantiate--running-processes
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(lax-plist-put nix-instantiate--running-processes
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prop (cons callback data)))
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(make-process
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:name "nix-instantiate"
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:buffer stdout
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:command (append (list nix-instantiate-executable nix-file)
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(when attribute (list "-A" attribute)))
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:noquery t
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:sentinel (apply-partially 'nix-instantiate--sentinel prop stderr)
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:stderr stderr)))
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(provide 'nix-instantiate)
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;;; nix-instantiate.el ends here
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