[PATCH 2/2] doc: add a hint about field processor support availability

[Jani Nikula <jani@nikula.org>]

In most cases the documentation and the notmuch binary will be built
on the same machine and the same dependencies. Hint at the field
processor support availability in the man page based on the
documentation build host.
---
 doc/Makefile.local                | 2 +-
 doc/man7/notmuch-search-terms.rst | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/doc/Makefile.local b/doc/Makefile.local
index c78aea49a108..cb01306c0b7c 100644
--- a/doc/Makefile.local
+++ b/doc/Makefile.local
@@ -9,7 +9,7 @@ DOCBUILDDIR      := $(dir)/_build
 
 # Configure options to be added as Sphinx tags.
 # Add "-t <tag>" for each make variable in TAGS that equals 1.
-TAGS := WITH_EMACS
+TAGS := WITH_EMACS HAVE_XAPIAN_FIELD_PROCESSOR
 TAGOPTS := $(patsubst %=1,-t %,$(filter %=1,$(foreach tag,$(TAGS),$(tag)=$(value $(tag)))))
 
 # Internal variables.
diff --git a/doc/man7/notmuch-search-terms.rst b/doc/man7/notmuch-search-terms.rst
index 1dd2dc5813f5..9e3b9398c58d 100644
--- a/doc/man7/notmuch-search-terms.rst
+++ b/doc/man7/notmuch-search-terms.rst
@@ -457,6 +457,14 @@ notmuch was built against a sufficiently recent version of Xapian by running
 
   % notmuch config get built_with.field_processor
 
+.. only:: HAVE_XAPIAN_FIELD_PROCESSOR
+
+   The documentation was built on a host with field processor support.
+
+.. only:: not HAVE_XAPIAN_FIELD_PROCESSOR
+
+   The documentation was built on a host without field processor support.
+
 Currently the following features require field processor support:
 
 - non-range date queries, e.g. "date:today"
-- 
2.20.1