From a697a62445cf8902cdfabf69f7faf7cfc6ba72c9 Mon Sep 17 00:00:00 2001
From: Masaya Tojo <masaya@tojo.tokyo>
Date: Sat, 11 Jul 2020 16:43:03 +0900
Subject: qkbox: toot: Create and/nil syntax and use it.

---
 qkbox/toot.scm | 91 ++++++++++++++++++++++++++++------------------------------
 1 file changed, 44 insertions(+), 47 deletions(-)

diff --git a/qkbox/toot.scm b/qkbox/toot.scm
index e433df8..d4c30a4 100644
--- a/qkbox/toot.scm
+++ b/qkbox/toot.scm
@@ -38,6 +38,11 @@
   #:use-module ((sxml xpath)
                 #:select (sxpath)))
 
+(define-syntax-rule (and/nil test expr)
+  (if test
+      expr
+      '()))
+
 (define current-mastodon-host
   (make-parameter (getenv "MASTODON_HOST")))
 
@@ -73,29 +78,24 @@
    'POST
    "/api/v1/statuses"
    #:json
-   `(,@(if status
-           `((status . ,(if (string? status)
-                            status
-                            (format #f "~y" status))))
-           '())
-     ,@(if spoiler-text
-           `((spoiler_text . ,spoiler-text))
-           '())
-     ,@(if visibility
-           (case visibility
-             ((public unlisted private direct)
-              `((visibility . ,visibility)))
-             (else
-              (error "post: invalid visibility (must be one of: public unlisted private direct)")))
-           '())
-     ,@(if sensitive? `((sensitive . (if sensitive? #t #f)))
-           '())
-     ,@(if reply-to
-           `((in_reply_to_id . ,reply-to))
-           '())
-     ,@(if media-ids
-           `((media_ids . ,(list->vector (map number->string media-ids))))
-           '()))
+   `(,@(and/nil status
+                `((status . ,(if (string? status)
+                                 status
+                                 (format #f "~y" status)))))
+     ,@(and/nil spoiler-text
+                `((spoiler_text . ,spoiler-text)))
+     ,@(and/nil visibility
+                (case visibility
+                  ((public unlisted private direct)
+                   `((visibility . ,visibility)))
+                  (else
+                   (error "post: invalid visibility (must be one of: public unlisted private direct)"))))
+     ,@(and/nil sensitive?
+                `((sensitive . (if sensitive? #t #f))))
+     ,@(and/nil reply-to
+                `((in_reply_to_id . ,reply-to)))
+     ,@(and/nil media-ids
+                `((media_ids . ,(list->vector (map number->string media-ids))))))
    #:authorization? #t))
 
 (define-record-type <status>
@@ -228,12 +228,11 @@
         (put-bytevector in body)
         (close in))
       (let ((pict (and (zero? (apply system* "convert"
-                                     `(,@(if resize
-                                             `("-resize"
-                                               ,(format #f "~d!x~d!"
-                                                        (car resize)
-                                                        (cadr resize)))
-                                             '())
+                                     `(,@(and/nil resize
+                                                  `("-resize"
+                                                    ,(format #f "~d!x~d!"
+                                                             (car resize)
+                                                             (cadr resize))))
                                        ,(string-append tmp "[0]")
                                        ,(string-append "png:" tmp))))
                        (pict-from-file tmp))))
@@ -282,11 +281,11 @@
    'GET
    "/api/v1/timelines/home"
    #:json
-   `(,@(if max-id `((max_id . ,max-id)) '())
-     ,@(if since-id `((since_id . ,since-id)) '())
-     ,@(if min-id `((min_id . ,min-id)) '())
-     ,@(if limit `((limit . ,limit)) '())
-     ,@(if local? `((local . ,local?)) '()))
+   `(,@(and/nil max-id `((max_id . ,max-id)))
+     ,@(and/nil since-id `((since_id . ,since-id)))
+     ,@(and/nil min-id `((min_id . ,min-id)))
+     ,@(and/nil limit `((limit . ,limit)))
+     ,@(and/nil local? `((local . ,local?))))
    #:authorization? #t))
 
 (define-public (favourite id)
@@ -352,13 +351,13 @@
                                    path)
                     #:method method
                     #:headers `(,@headers
-                                ,@(if authorization?
-                                      `((authorization
-                                         ,(string->symbol
-                                           (string-append
-                                            "Bearer "
-                                            (current-mastodon-access-token)))))
-                                      '()))
+                                ,@(and/nil
+                                   authorization?
+                                   `((authorization
+                                      ,(string->symbol
+                                        (string-append
+                                         "Bearer "
+                                         (current-mastodon-access-token)))))))
                     #:decode-body? #f
                     #:body body)
     (values res body)))
@@ -369,12 +368,10 @@
                   authorization?)
   (receive (res body)
       (raw-request method path
-                   #:body (if json
-                              (scm->json-string json)
-                              #f)
-                   #:headers (if json
-                                 '((content-type application/json))
-                                 '())
+                   #:body (and json
+                               (scm->json-string json))
+                   #:headers (and/nil json
+                                      '((content-type application/json)))
                    #:authorization? authorization?)
     (if (= 200 (response-code res))
         (values res (json-string->scm (utf8->string body)))
-- 
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