#!@GUILE@ -s
!#
;;;; lilypond-invoke-editor.scm -- Invoke an editor in file:line:column mode

;;;; Copyright (C) 2005--2020 Jan Nieuwenhuizen <janneke@gnu.org>

;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
;;;; LilyPond 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.
;;;;
;;;; LilyPond 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 LilyPond.  If not, see <http://www.gnu.org/licenses/>.

;; gui debug helper
;; (define (exit x) (system "sleep 10"))

(use-modules
 (ice-9 getopt-long)
 (ice-9 regex)
 (srfi srfi-1)
 (srfi srfi-13)
 (srfi srfi-14))

(define PROGRAM-NAME "lilypond-invoke-editor")
(define TOPLEVEL-VERSION "@TOPLEVEL_VERSION@")
(define DATADIR "@datadir@")
(define COMPILE-TIME-PREFIX
  (format #f "~a/lilypond/~a" DATADIR TOPLEVEL-VERSION))

;; argv0 relocation -- do in wrapper?

(define LILYPOND_DATADIR
  (let* ((prefix
          (or (getenv "LILYPOND_DATADIR")
              (dirname  (dirname (car (command-line)))))))


    (if (eq? prefix (dirname DATADIR)) COMPILE-TIME-PREFIX
        (format #f "~a/share/lilypond/~a"
                prefix TOPLEVEL-VERSION))))

(define-public _ gettext)

(define (show-version port)
  (format port "~a (GNU LilyPond) ~a\n" PROGRAM-NAME TOPLEVEL-VERSION))

(define (show-help port)
  (format port (_ "Usage: lilypond-invoke-editor [textedit://]FILE:LINE:CHAR:COLUMN

Visit a file and position the cursor.

Options:
  -h, --help          show this help
  -v, --version       show version
")))

(define (parse-options args)
  (let* ((options (getopt-long args
                               '((help (single-char #\h))
                                 (version (single-char #\v)))))
         (files (cdr (assq '() options))))
    (if (assq 'help options)
        (begin
          (show-version (current-output-port))
          (show-help (current-output-port))
          (exit 0)))
    (if (assq 'version options)
        (begin (show-version (current-output-port)) (exit 0)))
    (show-version (current-error-port))
    files))

(define (re-sub re sub string)
  (regexp-substitute/global #f re string 'pre sub 'post))

;; FIXME: I'm going slowly but certainly mad; I really cannot find the
;; scm library function for this.
(define (unquote-uri uri)
  (re-sub "%([A-Fa-f0-9]{2})"
          (lambda (m)
            (string (integer->char (string->number (match:substring m 1) 16))))
          uri))

(define (is-textedit-uri? uri)
  (string-match "^textedit:" uri))


(define (dissect-uri uri)
  (let* ((match (string-match "textedit://(.*):([0-9]+):([0-9]+):([0-9]*)$" uri)))
    (if match
        (list (unquote-uri (match:substring match 1))
              (match:substring match 2)
              (match:substring match 3)
              (match:substring match 4))
        (begin
          (format (current-error-port) (_ "invalid textedit URI: ~a") uri)
          (newline (current-error-port))
          (format (current-error-port) (_ "expect: textedit://FILE:LINE:CHAR:COLUMN"))
          (newline (current-error-port))
          (exit 1)))))

(define PLATFORM
  (string->symbol
   (string-downcase
    (car (string-tokenize (vector-ref (uname) 0) char-set:letter)))))

(define (running-from-gui?)
  (let ((have-tty? (isatty? (current-input-port))))
    ;; If no TTY and not using safe, assume running from GUI.
    (not have-tty?)))

(define (run-editor uri)
  (let*
      ((command (apply get-editor-command (dissect-uri uri)))
       (status (system command)))
    (if (not (= status 0))
        (begin
          (format (current-error-port)
                  (_ "failed to invoke editor: ~a") command)
          (exit 1)))))

(define (run-browser uri)
  (if (getenv "BROWSER")
      (system*
       (getenv "BROWSER")
       uri)
      (system*
       "firefox"
       "-remote"
       (format #f "OpenUrl(~a,new-tab)" uri))))

(define (strip-framework-path var)
  (define pat "lilypond/usr")
  (if (getenv var)
      (let*
          ((val (getenv var))
           (paths (string-split val #\:))
           (without (remove (lambda (s) (string-contains s pat))
                            paths)))

        (if (not (= (length without)
                    (length paths)))
            (setenv var (string-join without ":"))))))

(define (main args)
  (let ((files (parse-options args)))
    (if (running-from-gui?)
        (redirect-port (current-error-port)
                       (open-file (string-append
                                   (if (string-match "^(Windows|CYGWIN)"
                                                     (utsname:sysname (uname)))
                                       (or (getenv "TMP")
                                           (getenv "TEMP"))
                                       (or (getenv "TMPDIR")
                                           "/tmp"))
                                   "/lilypond-invoke-editor.log") "a")))
    (if (not (= (length files) 1))
        (begin
          (show-help (current-error-port))
          (exit 2)))
    (set! %load-path (cons LILYPOND_DATADIR %load-path))

    (primitive-eval '(use-modules (scm editor)))

    (strip-framework-path "LD_LIBRARY_PATH")
    (let* ((uri (car files)))
      (if (is-textedit-uri? uri)
          (run-editor uri)
          (run-browser uri)))))

(main (command-line))