Now that we have `notmuch-emacs-version' defined in notmuch emacs MUA
use that as a part of User-Agent: header to provide more accurate
version information when sending emails.

In case some incomplete installation of notmuch emacs MUA is used and
`notmuch-emacs-version' is defined as "unknown" then fall back to ask
version info from cli (as it used to be) -- the function to do that was
removed from `notmuch-version' to `notmuch-cli-version' to make things
clearer and more consistent.
---
 NEWS                   | 14 ++++++++++++++
 emacs/notmuch-hello.el |  2 +-
 emacs/notmuch-lib.el   |  4 ++--
 emacs/notmuch-mua.el   | 11 ++++++++---
 4 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/NEWS b/NEWS
index f7aaedf91d07..9664146768f3 100644
--- a/NEWS
+++ b/NEWS
@@ -7,6 +7,20 @@ Library changes
 Add return status to notmuch_database_close and
 notmuch_database_destroy
 
+Emacs Interface
+---------------
+
+`notmuch-emacs-version` is used in `User-Agent` header
+
+  The value of recently introduced variable `notmuch-emacs-version` is
+  now used as a part of `User-Agent` header when sending emails.
+
+Removed `notmuch-version` function by renaming it to `notmuch-cli-version`
+
+  With existing variable `notmuch-emacs-version` the accompanied
+  function which retrieves the version of `notmuch-command` is
+  better named as `notmuch-cli-version`.
+
 nmbug-status
 ------------
 
diff --git a/emacs/notmuch-hello.el b/emacs/notmuch-hello.el
index 65d062760a71..7bfa752d2a04 100644
--- a/emacs/notmuch-hello.el
+++ b/emacs/notmuch-hello.el
@@ -628,7 +628,7 @@ (defvar notmuch-emacs-version)
 (defun notmuch-hello-versions ()
   "Display the notmuch version(s)"
   (interactive)
-  (let ((notmuch-cli-version (notmuch-version)))
+  (let ((notmuch-cli-version (notmuch-cli-version)))
     (message "notmuch version %s"
             (if (string= notmuch-emacs-version notmuch-cli-version)
                 notmuch-cli-version
diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el
index 19269e3c469b..ca18ff9d5487 100644
--- a/emacs/notmuch-lib.el
+++ b/emacs/notmuch-lib.el
@@ -192,8 +192,8 @@ (defun notmuch-assert-cli-sane ()
 "Perhaps you haven't run \"notmuch setup\" yet? Try running this
 on the command line, and then retry your notmuch command")))
 
-(defun notmuch-version ()
-  "Return a string with the notmuch version number."
+(defun notmuch-cli-version ()
+  "Return a string with the notmuch-command version number."
   (let ((long-string
         ;; Trim off the trailing newline.
         (substring (notmuch-command-to-string "--version") 0 -1)))
diff --git a/emacs/notmuch-mua.el b/emacs/notmuch-mua.el
index 2c5888600b6c..dbf5df28669d 100644
--- a/emacs/notmuch-mua.el
+++ b/emacs/notmuch-mua.el
@@ -100,12 +100,17 @@ (defun notmuch-mua-user-agent-full ()
          " "
          (notmuch-mua-user-agent-emacs)))
 
+;; the following variable is defined as being defconst in notmuch-version.el
+(defvar notmuch-emacs-version)
+
 (defun notmuch-mua-user-agent-notmuch ()
-  "Generate a `User-Agent:' string suitable for notmuch."
-  (concat "Notmuch/" (notmuch-version) " (http://notmuchmail.org)"))
+  "Generate notmuch part of `User-Agent:' string suitable for notmuch."
+  (concat "Notmuch/" (if (string= notmuch-emacs-version "unknown")
+                        (notmuch-cli-version)
+                      notmuch-emacs-version) " (http://notmuchmail.org)"))
 
 (defun notmuch-mua-user-agent-emacs ()
-  "Generate a `User-Agent:' string suitable for notmuch."
+  "Generate emacs part of `User-Agent:' string suitable for notmuch."
   (concat "Emacs/" emacs-version " (" system-configuration ")"))
 
 (defun notmuch-mua-add-more-hidden-headers ()
-- 
2.0.0

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