[PATCH v4 2/3] emacs: add notmuch-version.el.tmpl and create notmuch-version.el from it

[Tomi Ollila <tomi.ollila@iki.fi>]

The notmuch cli program and emacs lisp versions may differ (especially
in remote usage). It helps to resolve problems if we can determine
the versions of notmuch cli and notmuch emacs mua separately.

The build process now creates notmuch-version.el from template file
by filling the version info to notmuch-emacs-version variable.
---
 emacs/.gitignore              |  1 +
 emacs/Makefile.local          | 11 +++++++++--
 emacs/notmuch-version.el.tmpl | 23 +++++++++++++++++++++++
 emacs/notmuch.el              |  4 ++++
 4 files changed, 37 insertions(+), 2 deletions(-)
 create mode 100644 emacs/notmuch-version.el.tmpl

diff --git a/emacs/.gitignore b/emacs/.gitignore
index 5421301..9fa1c44 100644
--- a/emacs/.gitignore
+++ b/emacs/.gitignore
@@ -1,2 +1,3 @@
 .eldeps*
 *.elc
+notmuch-version.el
diff --git a/emacs/Makefile.local b/emacs/Makefile.local
index 6a39b32..ca039e5 100644
--- a/emacs/Makefile.local
+++ b/emacs/Makefile.local
@@ -17,7 +17,14 @@ emacs_sources := \
 	$(dir)/notmuch-crypto.el \
 	$(dir)/notmuch-tag.el \
 	$(dir)/coolj.el \
-	$(dir)/notmuch-print.el
+	$(dir)/notmuch-print.el \
+	$(dir)/notmuch-version.el
+
+$(dir)/notmuch-version.el: $(dir)/Makefile.local version.stamp
+$(dir)/notmuch-version.el: $(dir)/notmuch-version.el.tmpl
+	@sed -e 's/%AG%/Generated file (from $(<F)) -- do not edit!/' \
+	     -e 's/%VERSION%/"$(VERSION)"/' $< > $@
+
 
 emacs_images := \
 	$(srcdir)/$(dir)/notmuch-logo.png
@@ -71,4 +78,4 @@ endif
 	mkdir -p "$(DESTDIR)$(emacsetcdir)"
 	install -m0644 $(emacs_images) "$(DESTDIR)$(emacsetcdir)"
 
-CLEAN := $(CLEAN) $(emacs_bytecode)
+CLEAN := $(CLEAN) $(emacs_bytecode) $(dir)/notmuch-version.el
diff --git a/emacs/notmuch-version.el.tmpl b/emacs/notmuch-version.el.tmpl
new file mode 100644
index 0000000..6cf367b
--- /dev/null
+++ b/emacs/notmuch-version.el.tmpl
@@ -0,0 +1,23 @@
+;; -*- emacs-lisp -*-
+;;
+;; %AG%
+;;
+;; This file is part of Notmuch.
+;;
+;; Notmuch is free software: you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; Notmuch is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with Notmuch.  If not, see <http://www.gnu.org/licenses/>.
+
+(defconst notmuch-emacs-version %VERSION%
+  "Version string of this version of Notmuch Emacs MUA.")
+
+(provide 'notmuch-version)
diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index 0471750..b7dd944 100644
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -61,6 +61,10 @@
 (require 'notmuch-message)
 (require 'notmuch-parser)
 
+(unless (require 'notmuch-version nil t)
+  (defconst notmuch-emacs-version "unknown"
+    "Placeholder variable when notmuch-version.el[c] is not available."))
+
 (defcustom notmuch-search-result-format
   `(("date" . "%12s ")
     ("count" . "%-7s ")
-- 
1.8.0