Add version and help options to convert

Place the `version' and `display-version' items in `common.scm' so
they can be easily used by both executables.

src/Makefile

@@ -1,11 +1,13 @@
+objects = paths.o common.o
+
 .PHONY: all
 
 all: linkwave convert
-linkwave: linkwave.scm paths.o
+linkwave: linkwave.scm $(objects)
 	csc $^ -o $@
 
-convert: convert.scm paths.o
+convert: convert.scm $(objects)
 	csc $^ -o $@
 
-paths.o: paths.scm
+$(objects): %.o: %.scm
 	csc -c $^

src/common.scm

@@ -0,0 +1,30 @@
+;;; linkwave -- Store/retrieve/manage bookmarks
+;; Copyright (C) 2012  Tom Willemsen <tom at ryuslash dot org>
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Common variables and procedures, used by several or all parts of
+;; this program.
+
+;;; Code:
+
+(declare (unit common))
+
+(define version "0.1.0")
+
+(define (display-version)
+  ;; Display linkwave's version number.
+  (format #t "linkwave v~a~%" version))

src/convert.scm

@@ -22,7 +22,8 @@
 
 ;;; Code:
 
-(declare (uses paths))
+(declare (uses paths
+               common))
 
 (require-extension sqlite3)
 (require-library srfi-4)
@@ -78,6 +79,36 @@
     (rename-file (data-file "nlinkwave.db") (data-file "linkwave.db"))
     (format #t "Database converted.~%")))
 
-(if (file-exists? "/home/slash/.local/share/linkwave/nlinkwave.db")
+(define (display-help)
-    (format #t "Converted database already exists.~%")
+  ;; Display linkwave's help message.
+  (format #t (string-append
+              "Usage: convert [options]...~%"
+              "~%"
+              "Possible options:~%"
+              "~%"
+              "--help, -h     Display this help and exit~%"
+              "--version, -v  Output version information and exit~%")))
+
+(define (main args)
+  ;; Convert an old database file unless a conversion database already
+  ;; exists.
+  (if (null? args)
+      (if (file-exists? (data-file "nlinkwave.db"))
+          (format #t (string-append "Conversion database already exists.  "
+                                    "Something may have gone wrong during the last run~%"))
           (convert))
+      (do ((arg (car args) (and (not (null? args))
+                                (car args))))
+          ((or (null? arg) (not arg)))
+        (cond
+         ((or (string= arg "-v") (string= arg "--version"))
+          (display-version)
+          (exit 0))
+         ((or (string= arg "-h") (string= arg "--help"))
+          (display-help)
+          (exit 0))
+         (else
+          (format #t "Unrecognized option: ~a~%" (car args))))
+        (set! args (cdr args)))))
+
+(main (command-line-arguments))

src/linkwave.scm

@@ -21,7 +21,8 @@
 
 ;;; Code:
 
-(declare (uses paths))
+(declare (uses paths
+               common))
 
 (require-extension sqlite3)
 (require-library posix srfi-4)
@@ -76,10 +77,6 @@
        (or (string= (substring str 0 7) "http://")
            (string= (substring str 0 8) "https://"))))
 
-(define (display-version)
-  ;; Display linkwave's version number.
-  (format #t "linkwave v~a~%" version))
-
 (define (display-help)
   ;; Display linkwave's help message.
   (format #t (string-append