[PATCH v4 18/18] Document line history browser

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Both 'git log' and 'git blame' support the same format
of '-L' arguments, so we refactor its description into
a new file.

And it is possible to use more than one '-L' option
for each path.

Signed-off-by: Bo Yang <struggleyb.nku@xxxxxxxxx>
---
 Documentation/blame-options.txt     |   19 +------------------
 Documentation/git-log.txt           |   15 +++++++++++++++
 Documentation/line-range-format.txt |   18 ++++++++++++++++++
 3 files changed, 34 insertions(+), 18 deletions(-)
 create mode 100644 Documentation/line-range-format.txt

diff --git a/Documentation/blame-options.txt b/Documentation/blame-options.txt
index 16e3c68..3526835 100644
--- a/Documentation/blame-options.txt
+++ b/Documentation/blame-options.txt
@@ -13,24 +13,7 @@
 	Annotate only the given line range.  <start> and <end> can take
 	one of these forms:
 
-	- number
-+
-If <start> or <end> is a number, it specifies an
-absolute line number (lines count from 1).
-+
-
-- /regex/
-+
-This form will use the first line matching the given
-POSIX regex.  If <end> is a regex, it will search
-starting at the line given by <start>.
-+
-
-- +offset or -offset
-+
-This is only valid for <end> and will specify a number
-of lines before or after the line given by <start>.
-+
+include::line-range-format.txt[]
 
 -l::
 	Show long rev (Default: off).
diff --git a/Documentation/git-log.txt b/Documentation/git-log.txt
index e970664..6f712e7 100644
--- a/Documentation/git-log.txt
+++ b/Documentation/git-log.txt
@@ -9,6 +9,7 @@ git-log - Show commit logs
 SYNOPSIS
 --------
 'git log' [<options>] [<since>..<until>] [[\--] <path>...]
+'git log' [<options>] -L n,m <path>
 
 DESCRIPTION
 -----------
@@ -19,6 +20,9 @@ command to control what is shown and how, and options applicable to
 the 'git diff-*' commands to control how the changes
 each commit introduces are shown.
 
+With '-L' option, the command will help to trace the history of user specified
+line ranges. It can trace multiple ranges coming from multiple files.
+
 
 OPTIONS
 -------
@@ -63,6 +67,17 @@ OPTIONS
 	Note that only message is considered, if also a diff is shown
 	its size is not included.
 
+-L <start>,<end>::
+	The line range.  <start> and <end> can take one of these forms:
+
+include::line-range-format.txt[]
+You can also specify this option more than once before each path.
+
+
+--full-line-diff::
+	Always print the interesting range even if the current commit
+	does not change any line of the range.
+
 [\--] <path>...::
 	Show only commits that affect any of the specified paths. To
 	prevent confusion with options and branch names, paths may need
diff --git a/Documentation/line-range-format.txt b/Documentation/line-range-format.txt
new file mode 100644
index 0000000..265bc23
--- /dev/null
+++ b/Documentation/line-range-format.txt
@@ -0,0 +1,18 @@
+- number
++
+If <start> or <end> is a number, it specifies an
+absolute line number (lines count from 1).
++
+
+- /regex/
++
+This form will use the first line matching the given
+POSIX regex.  If <end> is a regex, it will search
+starting at the line given by <start>.
++
+
+- +offset or -offset
++
+This is only valid for <end> and will specify a number
+of lines before or after the line given by <start>.
++
-- 
1.7.2.20.g388bbb

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