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;;; Shroud
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; Shroud 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.
;;;
;;; Shroud 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 Shroud. If not, see <http://www.gnu.org/licenses/>.
(define-module (shroud ui)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (srfi srfi-37)
#:use-module (shroud config)
#:use-module (shroud utils)
#:use-module (shroud secret)
#:export (simple-args-fold
program-name
show-version-and-exit
leave
leave-if-false
make-user-module
load*
shroud-main))
(define (simple-args-fold args options default-options)
(args-fold args options
(lambda (opt name arg result)
(leave "~A: unrecognized option" name))
(lambda (arg result)
(leave "~A: extraneuous argument" arg))
default-options))
(define program-name (make-parameter "shroud"))
(define %commands
'("hide" "list" "show" "remove"))
(define (show-help)
(format #t "Usage: shroud COMMAND ARGS...
Run COMMAND with ARGS.~%~%")
(format #t "COMMAND may be one of the sub-commands listed below:~%~%")
(format #t "~{ ~a~%~}" %commands))
(define (show-usage)
(format #t "Try `shroud --help' for more information.~%")
(exit 1))
(define (show-version-and-exit)
(format #t "~a ~a
Copyright (C) 2015 David Thompson <davet@gnu.org>
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.~%"
(program-name) %shroud-version)
(exit 0))
(define (leave format-string . args)
"Display error message and exist."
(apply format (current-error-port) format-string args)
(newline)
(exit 1))
(define (leave-if-false obj error . args)
"Display error message defined by the ERROR string and ARGS if OBJ
is #f."
(or obj (apply leave error args)))
(define (make-user-module modules)
"Return a new user module with the additional MODULES loaded."
;; Module in which the machine description file is loaded.
(let ((module (make-fresh-user-module)))
(for-each (lambda (iface)
(module-use! module (resolve-interface iface)))
modules)
module))
(define (report-load-error file args)
"Report the failure to load FILE, a user-provided Scheme file, and exit.
ARGS is the list of arguments received by the 'throw' handler."
(match args
(('system-error . _)
(let ((err (system-error-errno args)))
(leave "failed to load '~a': ~a~%" file (strerror err))))
(('syntax-error proc message properties form . rest)
(let ((file (assq-ref properties 'filename))
(line (assq-ref properties 'line))
(col (assq-ref properties 'column)))
(format (current-error-port) "~a:~a:~a: error: ~a~%"
file (and line (1+ line)) col message))
(exit 1))
((error args ...)
(format (current-error-port) "failed to load '~a':~%" file)
(apply display-error #f (current-error-port) args)
(exit 1))))
(define (load* file user-module)
"Load the user provided Scheme source code FILE."
(catch #t
(lambda ()
(set! %fresh-auto-compile #t)
(save-module-excursion
(lambda ()
(set-current-module user-module)
(primitive-load file))))
(lambda args
(report-load-error file args))))
(define %default-config
`((database-file . ,(string-append (getenv "HOME") "/.config/shroud/db.gpg"))
(gpg-binary . "gpg")))
(define (load-config)
"Load and evaluate user configuration file."
(let ((config (append (load* (string-append (getenv "HOME") "/.shroud")
(make-user-module '((shroud config))))
%default-config)))
(unless (assq-ref config 'user-id)
(leave "user-id must be specified in configuration"))
config))
(define (command-proc command)
"Return the procedure for COMMAND."
(let* ((module
(catch 'misc-error
(lambda ()
(resolve-interface `(shroud ui ,command)))
(lambda -
(format (current-error-port) "~a: invalid subcommand~%" command)
(show-usage)))))
(module-ref module (symbol-append 'shroud- command))))
(define (option? str)
"Return #t if STR is an option string."
(string-prefix? "-" str))
(define (make-program-name command)
"Return a program name string for COMMAND."
(string-append "shroud " (symbol->string command)))
(define (shroud-main . args)
(match args
(() (show-usage))
((or ("-h") ("--help"))
(show-help))
(("--version")
(show-version-and-exit))
(((? option? opt) _ ...)
(format (current-error-port) "shroud: unrecognized option '~a'~%" opt))
(((= string->symbol command) . args)
(let* ((config (load-config))
(db-file (assq-ref config 'database-file))
(user-id (assq-ref config 'user-id))
(gpg (assq-ref config 'gpg-binary)))
(parameterize ((gpg-binary gpg))
;; Don't load database until needed to avoid pinentry prompt
;; when running commands like 'shroud show --help'.
(let* ((db (delay
(catch 'decrypt-fail
(lambda () (load-secrets db-file))
(lambda (key file)
(leave "~a: could not decrypt database" file)))))
(proc (command-proc command))
(result (parameterize ((program-name (make-program-name
command)))
(apply proc config db args))))
(when result
(mkdir-p (dirname db-file))
(save-secrets result db-file user-id))))))))
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