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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 David Craven <david@craven.ch>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix 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.
+;;;
+;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build cargo-build-system)
+ #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+ #:use-module (guix build utils)
+ #:use-module (ice-9 ftw)
+ #:use-module (ice-9 format)
+ #:use-module (ice-9 match)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:export (%standard-phases
+ cargo-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard Rust package build procedure.
+;;
+;; Code:
+
+;; FIXME: Needs to be parsed from url not package name.
+(define (package-name->crate-name name)
+ "Return the crate name of NAME."
+ (match (string-split name #\-)
+ (("rust" rest ...)
+ (string-join rest "-"))
+ (_ #f)))
+
+(define* (configure #:key inputs #:allow-other-keys)
+ "Replace Cargo.toml [dependencies] section with guix inputs."
+ ;; Make sure Cargo.toml is writeable when the crate uses git-fetch.
+ (chmod "Cargo.toml" #o644)
+ (let ((port (open-file "Cargo.toml" "a" #:encoding "utf-8")))
+ (format port "~%[replace]~%")
+ (for-each
+ (match-lambda
+ ((name . path)
+ (let ((crate (package-name->crate-name name)))
+ (when (and crate path)
+ (match (string-split (basename path) #\-)
+ ((_ ... version)
+ (format port "\"~a:~a\" = { path = \"~a/share/rust-source\" }~%"
+ crate version path)))))))
+ inputs)
+ (close-port port))
+ #t)
+
+(define* (build #:key (cargo-build-flags '("--release" "--frozen"))
+ #:allow-other-keys)
+ "Build a given Cargo package."
+ (if (file-exists? "Cargo.lock")
+ (zero? (apply system* `("cargo" "build" ,@cargo-build-flags)))
+ #t))
+
+(define* (check #:key tests? #:allow-other-keys)
+ "Run tests for a given Cargo package."
+ (if (and tests? (file-exists? "Cargo.lock"))
+ (zero? (system* "cargo" "test"))
+ #t))
+
+(define* (install #:key inputs outputs #:allow-other-keys)
+ "Install a given Cargo package."
+ (let* ((out (assoc-ref outputs "out"))
+ (src (assoc-ref inputs "source"))
+ (rsrc (string-append (assoc-ref outputs "src")
+ "/share/rust-source")))
+ (mkdir-p rsrc)
+ ;; Rust doesn't have a stable ABI yet. Because of this
+ ;; Cargo doesn't have a search path for binaries yet.
+ ;; Until this changes we are working around this by
+ ;; distributing crates as source and replacing
+ ;; references in Cargo.toml with store paths.
+ (copy-recursively "src" (string-append rsrc "/src"))
+ (install-file "Cargo.toml" rsrc)
+ ;; When the package includes executables we install
+ ;; it using cargo install. This fails when the crate
+ ;; doesn't contain an executable.
+ (if (file-exists? "Cargo.lock")
+ (system* "cargo" "install" "--root" out)
+ (mkdir out))))
+
+(define %standard-phases
+ ;; 'configure' phase is not needed.
+ (modify-phases gnu:%standard-phases
+ (replace 'configure configure)
+ (replace 'build build)
+ (replace 'check check)
+ (replace 'install install)))
+
+(define* (cargo-build #:key inputs (phases %standard-phases)
+ #:allow-other-keys #:rest args)
+ "Build the given Cargo package, applying all of PHASES in order."
+ (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; cargo-build-system.scm ends here