[PATCH v7 2/5] blame: introduce $ as "end of file" in -L syntax

[Thomas Rast <trast@student.ethz.ch>]

To save the user a lookup of the last line number, introduce $ as a
shorthand for the last line.  This is mostly useful to spell "until
the end of the file" as '-L<begin>,$'.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 Documentation/line-range-format.txt | 6 ++++++
 line.c                              | 8 ++++++++
 2 files changed, 14 insertions(+)

diff --git a/Documentation/line-range-format.txt b/Documentation/line-range-format.txt
index 265bc23..9ce0688 100644
--- a/Documentation/line-range-format.txt
+++ b/Documentation/line-range-format.txt
@@ -16,3 +16,9 @@ starting at the line given by <start>.
 This is only valid for <end> and will specify a number
 of lines before or after the line given by <start>.
 +
+
+- `$`
++
+A literal dollar sign can be used as a shorthand for the last line in
+the file.
++
diff --git a/line.c b/line.c
index afd2e3b..a7f33ed 100644
--- a/line.c
+++ b/line.c
@@ -15,6 +15,14 @@ const char *parse_loc(const char *spec, nth_line_fn_t nth_line,
 	regmatch_t match[1];
 
 	/*
+	 * $ is a synonym for "the end of the file".
+	 */
+	if (spec[0] == '$') {
+		*ret = lines;
+		return spec + 1;
+	}
+
+	/*
 	 * Allow "-L <something>,+20" to mean starting at <something>
 	 * for 20 lines, or "-L <something>,-5" for 5 lines ending at
 	 * <something>.
-- 
1.7.11.rc1.243.gbf4713c