build-aux: Make test-corpus.scm a loadable script.

Make test-corpus.scm a script loadable from the REPL rather than
something that must be run on the shell. Loadable scripts are easier
to deal with since one does not have to deal with command-line
arguments.

* build-aux/test-corpus.scm (%fail-directory): Delete variable.
(write-failed-email): Add fail-directory argument.
(main): New function.

1 files changed, 18 insertions, 27 deletions

diff --git a/build-aux/test-corpus.scm b/build-aux/test-corpus.scm
index 83a359f..374060b 100644
--- a/build-aux/test-corpus.scm
+++ b/build-aux/test-corpus.scm
@@ -1,5 +1,5 @@
 ;;; guile-email --- Guile email parser
-;;; Copyright © 2021 Arun Isaac <arunisaac@systemreboot.net>
+;;; Copyright © 2023 Arun Isaac <arunisaac@systemreboot.net>
 ;;;
 ;;; This file is part of guile-email.
 ;;;
@@ -33,27 +33,17 @@
              (ice-9 match)
              (email email))
 
-(define %fail-directory
-  (match (command-line)
-    ((_ fail-directory) fail-directory)
-    ((arg0 _ ...)
-     (scm-error 'misc-error
-                #f
-                "Usage: ~A fail-directory"
-                (list arg0)
-                #f))))
-
 (define (directory-files directory)
   "Return files in DIRECTORY."
   (scandir directory (lambda (filename)
                        (not (member filename (list "." ".."))))))
 
-(define (write-failed-email corpus mbox index email)
+(define (write-failed-email fail-directory corpus mbox index email)
   "Write EMAIL, the INDEXth email in MBOX of CORPUS, for which
-parse-email fails to fail directory."
+parse-email fails to FAIL-DIRECTORY."
   (display (format "Failed on index ~a of ~a/~a~%" index corpus mbox))
   (call-with-output-file (format "~a/~a_~a_~a"
-                                 %fail-directory
+                                 fail-directory
                                  corpus
                                  (basename mbox ".mbox")
                                  index)
@@ -83,18 +73,19 @@ parse-email fails to fail directory."
                                     port)))))
             (directory-files corpus)))
 
-;; If fail directory exists, delete its contents. Else, create it.
-(if (file-exists? %fail-directory)
-    (for-each (lambda (file)
-                (delete-file (string-append %fail-directory "/" file)))
-              (directory-files %fail-directory))
-    (mkdir %fail-directory))
+(define (main fail-directory)
+  ;; If fail directory exists, delete its contents. Else, create it.
+  (if (file-exists? fail-directory)
+      (for-each (lambda (file)
+                  (delete-file (string-append fail-directory "/" file)))
+                (directory-files fail-directory))
+      (mkdir fail-directory))
 
-;; Test corpora.
-(test-corpus "guix-commits")
-(test-corpus "guix-patches")
-(test-corpus "bug-guix")
+  ;; Test corpora.
+  (test-corpus "guix-commits")
+  (test-corpus "guix-patches")
+  (test-corpus "bug-guix")
 
-;; If fail directory has any emails, then error out.
-(unless (null? (directory-files %fail-directory))
-  (error "Corpus test failed for some messages"))
+  ;; If fail directory has any emails, then error out.
+  (unless (null? (directory-files fail-directory))
+    (error "Corpus test failed for some messages")))