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+;;; guix-forge --- Guix software forge meta-service
+;;; Copyright © 2021 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 forge)
+  #:use-module (gnu)
+  #:use-module (srfi srfi-1)
+  #:use-module (ice-9 match)
+  #:use-module (gnu services mcron)
+  #:use-module (guix records)
+  #:use-module (forge laminar)
+  #:export (forge-service-type
+            forge-configuration
+            forge-configuration-projects
+            forge-project-configuration
+            forge-project-configuration-user
+            forge-project-configuration-repository
+            forge-project-configuration-website-directory
+            forge-project-configuration-ci-jobs))
+
+(define-record-type* <forge-project-configuration>
+  forge-project-configuration make-forge-project-configuration
+  forge-project-configuration?
+  (name forge-project-configuration-name)
+  (user forge-project-configuration-user)
+  (repository forge-project-configuration-repository)
+  (description forge-project-configuration-description
+               (default #f))
+  (website-directory forge-project-configuration-website-directory
+                     (default #f))
+  (ci-jobs forge-project-configuration-ci-jobs
+           (default '())))
+
+(define-record-type* <forge-configuration>
+  forge-configuration make-forge-configuration
+  forge-configuration?
+  (projects forge-configuration-projects
+            (default '())))
+
+(define (post-receive-hook project-name ci-jobs)
+  "Return a git post-receive-hook that triggers CI-JOBS."
+  (program-file (string-append project-name "-post-receive-hook")
+                (with-imported-modules '((guix build utils))
+                  #~(begin
+                      (use-modules (guix build utils))
+                      ;; TODO: Only trigger on updates to the main/master branch.
+                      (display "Triggering continuous integration jobs..." (current-error-port))
+                      (newline (current-error-port))
+                      (apply invoke
+                             #$(file-append laminar "/bin/laminarc")
+                             "queue" '#$ci-jobs)))))
+
+(define (forge-activation config)
+  (let ((projects
+         (map (lambda (project)
+                (list (forge-project-configuration-user project)
+                      (forge-project-configuration-repository project)
+                      (forge-project-configuration-description project)
+                      (forge-project-configuration-website-directory project)
+                      (post-receive-hook
+                       (forge-project-configuration-name project)
+                       (map guix-laminar-job-name
+                            (forge-project-configuration-ci-jobs project)))))
+              (forge-configuration-projects config))))
+    #~(begin
+        (use-modules (rnrs io ports)
+                     (srfi srfi-26)
+                     (ice-9 match))
+        
+        (define (find-regular-files dir)
+          (find-files dir (lambda (file stat)
+                            (memq (stat:type stat)
+                                  '(regular directory)))
+                      #:directories? #t))
+        
+        (for-each (match-lambda
+                    ((username repository description website-directory post-receive-hook)
+                     ;; For local repositories only
+                     (when (string-prefix? "/" repository)
+                       ;; Set description.
+                       (when description
+                         (call-with-output-file (string-append repository "/description")
+                           (cut put-string <> description)))
+                       ;; Install post receive hook.
+                       (let ((hook-link (string-append repository "/hooks/post-receive")))
+                         (when (file-exists? hook-link)
+                           (delete-file hook-link))
+                         (symlink post-receive-hook hook-link))
+                       ;; Set ownership of repository files.
+                       (for-each (lambda (file)
+                                   (let ((user (getpw username)))
+                                     (chown file (passwd:uid user) (passwd:gid user))))
+                                 (append (find-regular-files repository))))
+                     ;; Set ownership of website directory.
+                     (when website-directory
+                       (let ((user (getpw "laminar")))
+                         (chown website-directory (passwd:uid user) (passwd:gid user))))))
+                  '#$projects))))
+
+(define forge-service-type
+  (service-type
+   (name 'forge)
+   (description "Run guix-forge.")
+   (extensions (list (service-extension activation-service-type
+                                        forge-activation)
+                     (service-extension guix-laminar-service-type
+                                        (lambda (config)
+                                          (append
+                                           ;; jobs
+                                           (append-map forge-project-configuration-ci-jobs
+                                                       (forge-configuration-projects config))
+                                           ;; groups
+                                           (filter-map (lambda (project)
+                                                         (match (forge-project-configuration-ci-jobs project)
+                                                           (() #f)
+                                                           ((job) #f)
+                                                           (jobs
+                                                            (guix-laminar-group
+                                                             (name (forge-project-configuration-name project))
+                                                             (regex (string-join (map guix-laminar-job-name jobs)
+                                                                                 "|"))))))
+                                                       (forge-configuration-projects config)))))
+                     ;; Set up cron jobs to trigger CI jobs for remote
+                     ;; repositories.
+                     ;; TODO: Run CI job only if there are new commits
+                     ;; in the remote repository.
+                     (service-extension mcron-service-type
+                                        (lambda (config)
+                                          (filter-map (lambda (project)
+                                                        (and (not (string-prefix?
+                                                                   "/" (forge-project-configuration-repository project)))
+                                                             #~(job '(next-day)
+                                                                    #$(post-receive-hook
+                                                                       (forge-project-configuration-name project)
+                                                                       (map guix-laminar-job-name
+                                                                            (forge-project-configuration-ci-jobs project)))
+                                                                    #:user "laminar")))
+                                                      (forge-configuration-projects config))))))
+   (default-value (forge-configuration))))