Rename version to version.txt

Building Notmuch on macOS is known to cause problems because the Notmuch
distribution archive contains two files named "version". These names
clash with the <version> header as defined in C++20. Therefore, the
existing naming will likely become a problem on other platforms as well,
once compilers adopt the new standard.

Signed-off-by: Ralph Seichter <github@seichter.de>
Amended-by: db s/keyword/header/ in commit message.

Makefile.global

@@ -17,7 +17,7 @@ else
 DATE:=$(shell date +%F)
 endif
 
-VERSION:=$(shell cat ${srcdir}/version)
+VERSION:=$(shell cat ${srcdir}/version.txt)
 ELPA_VERSION:=$(subst ~,_,$(VERSION))
 ifeq ($(filter release release-message pre-release update-versions,$(MAKECMDGOALS)),)
 ifeq ($(IS_GIT),yes)

Makefile.local

@@ -19,7 +19,7 @@ endif
 
 # Depend (also) on the file 'version'. In case of ifeq ($(IS_GIT),yes)
 # this file may already have been updated.
-version.stamp: $(srcdir)/version
+version.stamp: $(srcdir)/version.txt
 	echo $(VERSION) > $@
 
 $(TAR_FILE):

bindings/python-cffi/setup.py

@@ -1,6 +1,6 @@
 import setuptools
 
-with open('version') as fp:
+with open('version.txt') as fp:
     VERSION = fp.read().strip()
 
 setuptools.setup(

doc/conf.py

@@ -19,7 +19,7 @@ copyright = u'2009-2020, Carl Worth and many others'
 location = os.path.dirname(__file__)
 
 for pathdir in ['.', '..']:
-    version_file = os.path.join(location,pathdir,'version')
+    version_file = os.path.join(location,pathdir,'version.txt')
     if os.path.exists(version_file):
         with open(version_file,'r') as infile:
             version=infile.read().replace('\n','')