[PATCH 3/5] Extract logic from inject-thread-callback

[Kyle Meyer <kyle@kyleam.com>]

An upcoming commit will use this same logic in another callback.
---
 piem.el | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/piem.el b/piem.el
index 4b35938..94fa1ad 100644
--- a/piem.el
+++ b/piem.el
@@ -372,6 +372,16 @@ (defun piem-check-gunzip ()
     (setq piem--has-gunzip (executable-find "gunzip")))
   piem--has-gunzip)
 
+(defun piem--url-remove-header ()
+  (goto-char (1+ url-http-end-of-headers))
+  (delete-region (point-min) (point)))
+
+(defun piem--url-decompress ()
+  (unless (= 0 (call-process-region nil nil "gunzip" nil t))
+    (error "Decompressing t.mbox.gz failed"))
+  (delete-region (point) (point-max))
+  (goto-char (point-min)))
+
 (defun piem--write-mbox-to-maildir ()
   (let ((n-messages 0))
     (while (and (not (eobp))
@@ -406,13 +416,9 @@ (defun piem--inject-thread-callback (status mid message-only)
         (let ((error-status (plist-get status :error)))
           (if error-status
               (signal (car error-status) (cdr error-status))
-            (goto-char (1+ url-http-end-of-headers))
-            (delete-region (point-min) (point))
+            (piem--url-remove-header)
             (unless message-only
-              (unless (= 0 (call-process-region nil nil "gunzip" nil t))
-                (error "Decompressing t.mbox.gz failed"))
-              (delete-region (point) (point-max)))
-            (goto-char (point-min))
+              (piem--url-decompress))
             (let ((message-count (piem--write-mbox-to-maildir)))
               (message "%d message(s) for %s moved to %s"
                        message-count mid piem-maildir-directory))
-- 
2.28.0