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;;; Haunt --- Static site generator for GNU Guile
;;; Copyright © 2015, 2022 David Thompson <davet@gnu.org>
;;;
;;; This file is part of Haunt.
;;;
;;; Haunt 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.
;;;
;;; Haunt 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 Haunt. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Haunt serve sub-command.
;;
;;; Code:
(define-module (haunt ui serve)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-37)
#:use-module (ice-9 match)
#:use-module (ice-9 format)
#:use-module (ice-9 ftw)
#:use-module (ice-9 threads)
#:use-module (haunt config)
#:use-module (haunt serve web-server)
#:use-module (haunt site)
#:use-module (haunt ui)
#:export (haunt-serve))
(define %linux?
(string=? (utsname:sysname (uname)) "Linux"))
(define (show-help)
(format #t "Usage: haunt serve [OPTION]
Start an HTTP server for the current site.~%")
(display "
-p, --port port to listen on")
(display "
-w, --watch rebuild site when files change")
(newline)
(show-common-options-help)
(newline)
(display "
-h, --help display this help and exit")
(display "
-V, --version display version and exit")
(newline))
(define %options
(cons* (option '(#\h "help") #f #f
(lambda _
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda _
(show-version-and-exit "haunt serve")))
(option '(#\p "port") #t #f
(lambda (opt name arg result)
(alist-cons 'port (string->number* arg) result)))
(option '(#\w "watch") #f #f
(lambda (opt name arg result)
(alist-cons 'watch? #t result)))
%common-options))
(define %default-options
(cons '(port . 8080)
%default-common-options))
(define (call-with-error-handling thunk)
(catch #t
thunk
(lambda (key . args)
(let ((cep (current-error-port))
(stack (make-stack #t 1)))
(display "ERROR: site rebuild failed\n\n" cep)
(display "Backtrace:\n" cep)
(display-backtrace stack cep)
(newline cep)
(apply display-error (stack-ref stack 0) cep args)
(newline cep)))))
;; TODO: Detect new directories and watch them, too.
(define (watch/linux config-file check-dir? check-file?)
;; Lazy load inotify module. Requiring the module in the
;; define-module definition would cause crashes on non-Linux
;; platforms where the FFI cannot bind to inotify functions.
(define inotify-module (resolve-module '(haunt inotify)))
(define make-inotify (module-ref inotify-module 'make-inotify))
(define inotify-add-watch! (module-ref inotify-module 'inotify-add-watch!))
(define inotify-pending-events?
(module-ref inotify-module 'inotify-pending-events?))
(define inotify-read-event (module-ref inotify-module 'inotify-read-event))
(define inotify-watch-file-name
(module-ref inotify-module 'inotify-watch-file-name))
(define inotify-event-watch (module-ref inotify-module 'inotify-event-watch))
(define inotify-event-file-name
(module-ref inotify-module 'inotify-event-file-name))
(define inotify-event-type (module-ref inotify-module 'inotify-event-type))
(let ((inotify (make-inotify)))
(define (no-op name stat result) result)
(define (watch-directory name stat result)
(and (check-dir? name)
(inotify-add-watch! inotify name
'(create delete close-write moved-to moved-from))
#t))
;; Drop .scm extension, remove working directory,
;; and transform into a symbolic module name.
(define (file-name->module-name file-name)
(map string->symbol
(string-split (string-drop (string-take file-name
(- (string-length file-name)
4))
(+ (string-length (getcwd)) 1))
#\/)))
(file-system-fold watch-directory no-op no-op no-op no-op no-op #t (getcwd))
(let loop ((processed-event? #f))
(cond
((inotify-pending-events? inotify)
(let* ((event (inotify-read-event inotify))
(type (inotify-event-type event))
(file-name (string-append (inotify-watch-file-name
(inotify-event-watch event))
"/"
(inotify-event-file-name event))))
(if (and (check-dir? file-name) (check-file? file-name))
(let ((action (case type
((create) "create")
((delete) "delete")
((close-write) "write")
((moved-to moved-from) "move"))))
(format #t "watch: observed ~a '~a'~%" action file-name)
;; Reload Scheme modules when they are changed.
(when (%search-load-path file-name)
(let ((module (resolve-module
(file-name->module-name file-name))))
(when (module-filename module)
(format #t "watch: reload module ~s~%"
(module-name module))
(reload-module module))))
(loop #t))
(loop processed-event?))))
(processed-event?
(display "rebuilding...\n")
(call-with-error-handling
(lambda ()
(build-site (load-config config-file))))
(loop #f))
(else
(sleep 1)
(loop #f))))))
;; XXX: Make this less naive.
(define (watch/fallback config-file check-dir? check-file?)
"Watch the current working directory for changes to any of its files
that match CHECK-FILE? and any subdirectories that match CHECK-DIR?.
When a file has been changed, reload CONFIG-FILE and rebuild the
site."
(define cwd (getcwd))
(define (any-files-changed? time)
(define (enter? name stat result)
;; Don't bother descending if we already know that a file has
;; changed.
(and (not result) (check-dir? name)))
(define (leaf name stat result)
;; Test if file has been modified since the last time we
;; checked.
(or result
(and (check-file? name)
(or (>= (stat:mtime stat) time)
(>= (stat:ctime stat) time)))))
(define (no-op name stat result) result)
(file-system-fold enter? leaf no-op no-op no-op no-op #f cwd))
(let loop ((time (current-time)))
(when (any-files-changed? time)
(display "watch: file changes detected")
(display "rebuilding...\n")
(call-with-error-handling
(lambda ()
(build-site (load-config config-file)))))
(let ((next-time (current-time)))
(sleep 1)
(loop next-time))))
(define (haunt-serve . args)
(let* ((opts (simple-args-fold args %options %default-options))
(port (assq-ref opts 'port))
(watch? (assq-ref opts 'watch?))
(config (assq-ref opts 'config))
(site (load-config config))
(doc-root (site-build-directory site)))
(format #t "serving ~a on port ~d~%" doc-root port)
(when watch?
(let ((watch (if %linux?
(begin
(display "watch: using inotify mode\n")
watch/linux)
(begin
(display "watch: using fallback mode\n")
watch/fallback))))
(call-with-new-thread
(lambda ()
(watch config
(let ((build-dir (string-append (getcwd) "/"
(site-build-directory site))))
(lambda (dir)
(not
(string-prefix? build-dir dir))))
(site-file-filter site))))))
(serve doc-root #:open-params `(#:port ,port))))
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