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+;;; guix-forge --- Guix software forge meta-service
+;;; Copyright © 2022 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of guix-forge.
+;;;
+;;; guix-forge is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published
+;;; by the Free Software Foundation, either version 3 of the License,
+;;; or (at your option) any later version.
+;;;
+;;; guix-forge is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with guix-forge. If not, see
+;;; <https://www.gnu.org/licenses/>.
+
+(define-module (forge utils)
+ #:use-module (ice-9 match)
+ #:use-module (guix derivations)
+ #:use-module (guix gexp)
+ #:use-module (guix monads)
+ #:use-module (guix profiles)
+ #:use-module (guix search-paths)
+ #:use-module (guix store)
+ #:export (with-packages))
+
+(define (profile-with-packages packages)
+ "Return profile with PACKAGES."
+ (with-store store
+ (run-with-store store
+ (mlet* %store-monad ((prof-drv (profile-derivation
+ (packages->manifest packages)))
+ (profile -> (derivation->output-path prof-drv)))
+ (mbegin %store-monad
+ (built-derivations (list prof-drv))
+ (return profile))))))
+
+(define (environment-with-packages packages)
+ "Return environment of a profile with PACKAGES. Return value is an
+association list mapping the name of an environment variable to its
+value."
+ (map (match-lambda
+ ((search-path . value)
+ (cons (search-path-specification-variable search-path)
+ value)))
+ (profile-search-paths (profile-with-packages packages))))
+
+(define (with-packages packages exp)
+ "Return a gexp executing EXP, another gexp, in an environment where
+PACKAGES are available and their search path environment variables
+have been set."
+ #~(begin
+ ;; Add a reference to the profile.
+ #$(profile-with-packages packages)
+ ;; Set the environment.
+ ;; We pull out match-lambda using module-ref instead of using
+ ;; use-modules because this gexp will be substituted into other
+ ;; gexps and use-modules only works at the top-level.
+ (let-syntax ((match-lambda (macro-transformer
+ (module-ref (resolve-module '(ice-9 match))
+ 'match-lambda))))
+ (for-each (match-lambda
+ ((variable . value)
+ (setenv variable value)))
+ '#$(environment-with-packages packages)))
+ ;; Run the provided expression.
+ #$exp))