[PATCH 2/2] var doc: advertise current DEFAULT_PAGER and DEFAULT_EDITOR settings

[Jonathan Nieder <jrnieder@gmail.com>]

Document the default pager and editor chosen at compile time in the
git-var(1) manpage so users curious about what command _this_ copy of
git will fall back to when EDITOR, VISUAL, and PAGER are unset can
find the answer quickly.

In builds leaving those settings uncustomized, this patch makes the
manpage continue to say "usually vi" and "usually less" so the
formatted documentation is usable for a wide audience including users
of custom builds that change those settings.  If you would like your
copy of the docs to be less noncommittal, you will need to set
DEFAULT_PAGER=less and DEFAULT_EDITOR=vi explicitly.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
Thanks for reading.

 Documentation/Makefile    |   10 ++++++++++
 Documentation/git-var.txt |   10 ++++++++++
 Makefile                  |    2 ++
 3 files changed, 22 insertions(+)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index d40e211f..9fee0b92 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -124,6 +124,16 @@ SHELL_PATH ?= $(SHELL)
 # Shell quote;
 SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
 
+ifdef DEFAULT_PAGER
+DEFAULT_PAGER_SQ = $(subst ','\'',$(DEFAULT_PAGER))
+ASCIIDOC_EXTRA += -a 'git-default-pager=$(DEFAULT_PAGER_SQ)'
+endif
+
+ifdef DEFAULT_EDITOR
+DEFAULT_EDITOR_SQ = $(subst ','\'',$(DEFAULT_EDITOR))
+ASCIIDOC_EXTRA += -a 'git-default-editor=$(DEFAULT_EDITOR_SQ)'
+endif
+
 #
 # Please note that there is a minor bug in asciidoc.
 # The version after 6.0.3 _will_ include the patch found here:
diff --git a/Documentation/git-var.txt b/Documentation/git-var.txt
index beef9e28..44a5e356 100644
--- a/Documentation/git-var.txt
+++ b/Documentation/git-var.txt
@@ -44,14 +44,24 @@ GIT_EDITOR::
     --nofork`.  The order of preference is the `$GIT_EDITOR`
     environment variable, then `core.editor` configuration, then
     `$VISUAL`, then `$EDITOR`, and then the default chosen at compile
+ifndef::git-default-editor[]
     time, which is usually 'vi'.
+endif::git-default-editor[]
+ifdef::git-default-editor[]
+    time ('{git-default-editor}').
+endif::git-default-editor[]
 
 GIT_PAGER::
     Text viewer for use by git commands (e.g., 'less').  The value
     is meant to be interpreted by the shell.  The order of preference
     is the `$GIT_PAGER` environment variable, then `core.pager`
     configuration, then `$PAGER`, and then the default chosen at
+ifndef::git-default-pager[]
     compile time (usually 'less').
+endif::git-default-pager[]
+ifdef::git-default-pager[]
+    compile time ('{git-default-pager}').
+endif::git-default-pager[]
 
 Diagnostics
 -----------
diff --git a/Makefile b/Makefile
index be1957a5..adc48b0d 100644
--- a/Makefile
+++ b/Makefile
@@ -2258,6 +2258,8 @@ $(XDIFF_LIB): $(XDIFF_OBJS)
 $(VCSSVN_LIB): $(VCSSVN_OBJS)
 	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(VCSSVN_OBJS)
 
+export DEFAULT_EDITOR DEFAULT_PAGER
+
 doc:
 	$(MAKE) -C Documentation all
 
-- 
1.7.10.rc3