build-system: Add vim-build-system.

* guix/build-system/vim.scm,
* guix/build/vim-build-system.scm: New modules.
* Makefile.am (MODULES): Register new files.
* doc/guix.texi: Document it.

Co-authored-by: Efraim Flashner <efraim@flashner.co.il>
Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

guix/build-system/vim.scm

@@ -0,0 +1,157 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Jonathan Scoresby <me@jonscoresby.com>
+;;; Copyright © 2023 Efraim Flashner <efraim@flashner.co.il>
+;;;
+;;; 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-system vim)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix gexp)
+  #:use-module (guix monads)
+  #:use-module (guix packages)
+  #:use-module (guix search-paths)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system copy)
+  #:use-module (guix build-system gnu)
+  #:export (%vim-build-system-modules vim-build vim-build-system))
+
+;; Commentary:
+;;
+;; Standard package installer for vim and neovim plugins.
+;; This is implemented as an extension of the `copy-build-system'
+;; and takes advantage of vim and neovim's built-in package manager.
+;; It extends the installation procedure from the copy-build-system
+;; to put files in the correct place and then generates help tags.
+;;
+;; Code:
+
+(define %vim-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build vim-build-system)
+    ,@%copy-build-system-modules))
+
+(define (default-vim)
+  "Return the default Vim package."
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((vim (resolve-interface '(gnu packages vim))))
+    (module-ref vim 'vim)))
+
+(define (default-neovim)
+  "Return the default Neovim package."
+  (let ((vim (resolve-interface '(gnu packages vim))))
+    (module-ref vim 'neovim)))
+
+(define* (lower name
+                #:key source
+                inputs
+                native-inputs
+                outputs
+                system
+                target
+                (vim? #f)
+                (neovim? #f)
+                (plugin-name name)
+                (vim (default-vim))
+                (neovim (default-neovim))
+                #:allow-other-keys #:rest arguments)
+  "Return a bag for NAME."
+  (let* ((private-keywords '(#:target #:vim #:neovim #:inputs #:native-inputs))
+         (vim? (or (string-prefix? "vim-" name)
+                   vim?))
+         (neovim? (or (string-prefix? "neovim-" name)
+                      neovim?))
+         (vim-inputs (append (if vim?
+                                 `(("vim" ,vim))
+                                 '())
+                             (if neovim?
+                                 `(("neovim" ,neovim))
+                                 '())))
+         (vim-arguments (append arguments
+                                `(#:vim? ,vim?
+                                  #:neovim? ,neovim?))))
+    (bag (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '()) ,@inputs
+
+                        ;; Keep the standard inputs of 'gnu-build-system'.
+                        ,@(standard-packages)))
+         (build-inputs `(,@vim-inputs ,@native-inputs))
+         (outputs outputs)
+         (build vim-build)
+         (arguments (strip-keyword-arguments private-keywords vim-arguments)))))
+
+(define* (vim-build name inputs
+                    #:key guile
+                    source
+                    (vim? #f)
+                    (neovim? #f)
+                    (mode "start")
+                    (plugin-name name)
+                    (install-plan ''())
+                    (phases '(@ (guix build vim-build-system) %standard-phases))
+                    (outputs '("out"))
+                    (search-paths '())
+                    (system (%current-system))
+                    (substitutable? #t)
+                    (imported-modules %vim-build-system-modules)
+                    (modules '((guix build vim-build-system)
+                               (guix build utils))))
+
+  (define build
+    (with-imported-modules imported-modules
+      #~(begin
+          (use-modules #$@modules)
+          #$(with-build-variables inputs outputs
+              #~(vim-build #:name #$name
+                           #:vim? #$vim?
+                           #:neovim? #$neovim?
+                           #:mode #$mode
+                           #:plugin-name #$plugin-name
+                           #:install-plan #$(if (pair? install-plan)
+                                                (sexp->gexp install-plan)
+                                                install-plan)
+                           #:source #+source
+                           #:system #$system
+                           #:phases #$(if (pair? phases)
+                                          (sexp->gexp phases)
+                                          phases)
+                           #:outputs %outputs
+                           #:search-paths '#$(sexp->gexp
+                                               (map search-path-specification->sexp
+                                                    search-paths))
+                           #:inputs
+                           %build-inputs)))))
+
+  (mlet %store-monad
+        ((guile (package->derivation (or guile (default-guile))
+                                     system #:graft? #f)))
+        (gexp->derivation name
+                          build
+                          #:system system
+                          #:target #f
+                          #:graft? #f
+                          #:substitutable? substitutable?
+                          #:guile-for-build guile)))
+
+(define vim-build-system
+  (build-system (name 'vim)
+                (description "The standard Vim build system")
+                (lower lower)))
+
+;;; vim.scm ends here