[PATCH 1/2] contrib: pick: add thread based utility functions

[David Bremner]

Mark Walters <markwalters1009 at gmail.com> writes:

> Previously notmuch-pick had no thread based functionality. This adds a
> macro to iterate through all messages in a thread. To simplify this it
> adds a text-property marker to the first message of each thread.


> +(defun notmuch-pick-get-messages-ids-thread ()
> +  "Return all id: queries of messages in the current thread."
> +  (let ((message-ids))
> +    (notmuch-pick-thread-mapc
> +     (lambda () (push (notmuch-pick-get-message-id) message-ids)))
> +    message-ids))

As a style thing, it seems more idiomatic to me to have a map macro
which returns a sequence, rather than faking it with mapc and push. But
maybe that's a typical common lisp style, I don't know.

More importantly, in emacs 24.3 I get an infinite loop when trying to
evaluate the update notmuch-pick.el. 

The backtrace is below. I'm not a macro expert, but seems like too much
is happening at compile/eval time.

----------------------------------------------------------------------

Debugger entered--Lisp error: (quit)
  (save-excursion (beginning-of-line) (get-text-property (point) :notmuch-message-properties))
  notmuch-pick-get-message-properties()
  (or props (notmuch-pick-get-message-properties))
  (let ((props (or props (notmuch-pick-get-message-properties)))) (plist-get props prop))
  notmuch-pick-get-prop(:first)
  (not (notmuch-pick-get-prop :first))
  (while (not (notmuch-pick-get-prop :first)) (forward-line -1))
  notmuch-pick-thread-top()
  (save-excursion (notmuch-pick-thread-top) (progn (while (progn (progn (funcall function) (forward-line)) (and (notmuch-pick-get-message-properties) (not (notmuch-pick-get-prop :first))))) nil))
  (lambda (function) "Iterate through all messages in the current thread\n and call FUNCTION for side effects." (save-excursion (notmuch-pick-thread-top) (progn (while (progn (progn (funcall function) (forward-line)) (and (notmuch-pick-get-message-properties) (not (notmuch-pick-get-prop :first))))) nil)))((lambda nil (push (notmuch-pick-get-message-id) message-ids)))
  macroexpand((notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) nil)
  macroexp--expand-all((notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))))
  macroexp--all-forms(((notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids))
  #[1028 "\300.\300\301.\302\"\303.!.@A#.@#\207" [macroexp--cons macroexp--all-clauses 1 macroexp--all-forms] 10 "\n\n(fn FORM BODY BINDINGS FUN)"](((let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids)) ((notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids) ((message-ids)) let)
  macroexp--expand-all((let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids))
  macroexp--all-forms((lambda nil "Return all id: queries of messages in the current thread." (let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids)) 2)
  macroexp--expand-all((function (lambda nil "Return all id: queries of messages in the current thread." (let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids))))
  macroexp--all-forms((defalias (quote notmuch-pick-get-messages-ids-thread) (function (lambda nil "Return all id: queries of messages in the current thread." (let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids)))) 1)
  #[514 "\300.\301\"\211\204.
  macroexp--expand-all((defun notmuch-pick-get-messages-ids-thread nil "Return all id: queries of messages in the current thread." (let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids)))
  macroexpand-all((defun notmuch-pick-get-messages-ids-thread nil "Return all id: queries of messages in the current thread." (let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids)))
  #[0 "	\nB.\303\300!)\207" [(defun notmuch-pick-get-messages-ids-thread nil "Return all id: queries of messages in the current thread." (let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids)) load-file-name macroexp--pending-eager-loads macroexpand-all] 2 "\n\n(fn)"]()
  funcall(#[0 "	\nB.\303\300!)\207" [(defun notmuch-pick-get-messages-ids-thread nil "Return all id: queries of messages in the current thread." (let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids)) load-file-name macroexp--pending-eager-loads macroexpand-all] 2 "\n\n(fn)"])
  internal-macroexpand-for-load((defun notmuch-pick-get-messages-ids-thread nil "Return all id: queries of messages in the current thread." (let ((message-ids)) (notmuch-pick-thread-mapc (lambda nil (push (notmuch-pick-get-message-id) message-ids))) message-ids)))
  eval-current-buffer()
  call-interactively(eval-current-buffer record nil)
  command-execute(eval-current-buffer record)
  execute-extended-command(nil "eval-current-buffer")
  call-interactively(execute-extended-command nil nil)