[RFC PATCH v2 1/4] doc: grep: unify info on configuration variables

[Matheus Tavares <matheus.bernardino@usp.br>]

Explanations about the configuration variables for git-grep are
duplicated in "Documentation/git-grep.txt" and
"Documentation/config/grep.txt", which can make maintenance difficult.
The first also contains a definition not present in the latter
(grep.fullName). To avoid problems like this, let's unify the
information in the second file and include it in the first.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
---
 Documentation/config/grep.txt | 10 ++++++++--
 Documentation/git-grep.txt    | 36 ++++++-----------------------------
 2 files changed, 14 insertions(+), 32 deletions(-)

diff --git a/Documentation/config/grep.txt b/Documentation/config/grep.txt
index 44abe45a7c..dd51db38e1 100644
--- a/Documentation/config/grep.txt
+++ b/Documentation/config/grep.txt
@@ -16,8 +16,14 @@ grep.extendedRegexp::
 	other than 'default'.
 
 grep.threads::
-	Number of grep worker threads to use.
-	See `grep.threads` in linkgit:git-grep[1] for more information.
+	Number of grep worker threads to use. See `--threads`
+ifndef::git-grep[]
+	in linkgit:git-grep[1]
+endif::git-grep[]
+	for more information.
+
+grep.fullName::
+	If set to true, enable `--full-name` option by default.
 
 grep.fallbackToNoIndex::
 	If set to true, fall back to git grep --no-index if git grep
diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
index a7f9bc99ea..9bdf807584 100644
--- a/Documentation/git-grep.txt
+++ b/Documentation/git-grep.txt
@@ -41,34 +41,8 @@ characters.  An empty string as search expression matches all lines.
 CONFIGURATION
 -------------
 
-grep.lineNumber::
-	If set to true, enable `-n` option by default.
-
-grep.column::
-	If set to true, enable the `--column` option by default.
-
-grep.patternType::
-	Set the default matching behavior. Using a value of 'basic', 'extended',
-	'fixed', or 'perl' will enable the `--basic-regexp`, `--extended-regexp`,
-	`--fixed-strings`, or `--perl-regexp` option accordingly, while the
-	value 'default' will return to the default matching behavior.
-
-grep.extendedRegexp::
-	If set to true, enable `--extended-regexp` option by default. This
-	option is ignored when the `grep.patternType` option is set to a value
-	other than 'default'.
-
-grep.threads::
-	Number of grep worker threads to use. If unset (or set to 0), Git will
-	use as many threads as the number of logical cores available.
-
-grep.fullName::
-	If set to true, enable `--full-name` option by default.
-
-grep.fallbackToNoIndex::
-	If set to true, fall back to git grep --no-index if git grep
-	is executed outside of a git repository.  Defaults to false.
-
+:git-grep: 1
+include::config/grep.txt[]
 
 OPTIONS
 -------
@@ -269,8 +243,10 @@ providing this option will cause it to die.
 	found.
 
 --threads <num>::
-	Number of grep worker threads to use.
-	See `grep.threads` in 'CONFIGURATION' for more information.
+	Number of grep worker threads to use. If not provided (or set to
+	0), Git will use as many worker threads as the number of logical
+	cores available. The default value can also be set with the
+	`grep.threads` configuration.
 
 -f <file>::
 	Read patterns from <file>, one per line.
-- 
2.26.2